Property and Environment Forum Trade Effluent A guide to evaluating the case for an application for Trade Effluent Consent NHSScotland, P&EFEx, March 2005
Contents 1. Introduction page 3 2. Definitions page 5 3. Trade Effluent and the Consent System page 7 4. The Consent page 9 5. Trade Effluent Charges page 12 6. Pollution Prevention Controls page 16 Appendices page 19 Appendix 1: Allowances Guidance and Waste Water/Trade Effluent Calculation Form Appendix 2: Formulae and abbreviations Appendix 3: Substances to be removed from the effluent Appendix 4: Leaflets from Scottish Water Version 1.0: March 2005 Page 2 of 25
1. Introduction 1.1 This document has been written in partnership with NHS National Services Scotland - Scottish Healthcare Supplies and Scottish Water. 1.2 A joint Trade Effluent working group was set up in May 2003 to improve understanding between Scottish Water and NHSScotland. Recognising that there was a need for increased awareness and consistency across Scotland. The aim of the group was to simplify and standardise the application processes associated with Consent to discharge Trade Effluent into a public sewer under the Sewerage (Scotland) Act 1968. The subject matter was broken down and addressed under the following headings: The Consent: including the application process for permission to discharge; Trade Effluent Charges: including the application process and the process for claiming allowances. 1.3 This NHSScotland Trade Effluent document will apply to: new healthcare premises seeking Trade Effluent Consent; existing healthcare premises making an application for Trade Effluent Consent for the first time; all existing Consented healthcare premises at the next review date (or sooner if requested) but no later than 1 April 2005; and will be reviewed in March 2006. Background 1.4 NHSScotland healthcare premises generate waste water, and discharge the waste water into the public sewerage system. Through the sewerage system the waste is conveyed to a waste water treatment works where it is treated to an appropriate standard before being returned to the environment. 1.5 A charge is made for this service which is intended to reflect the nature and volume of the discharge and the degree of treatment provided. Scottish Water controls all significant waste water discharges to sewer through a system of permits known as Consents. This system of control was initiated by the Sewerage (Scotland) Act 1968 and is still in force. 1.6 This document explains the Consent system by defining different types of waste water and gives details about the Consent system. 1.7 Throughout this document the term healthcare premises is used. This definition covers both hospitals where inpatient care is provided and other types of healthcare premises which satisfy the criteria described in paragraph 3.4. Version 1.0: March 2005 Page 3 of 25
1.8 Questions about this guidance should be referred to the Scottish Water Key Customer Manager or Trade Effluent Quality Team Adviser who can be contacted on the Scottish Water Customer Helpline at 0845 601 8855 or at www.scottishwater.co.uk Version 1.0: March 2005 Page 4 of 25
2. Definitions Trade Effluent 2.1 The legal definition of Trade Effluent covers any liquid waste produced in the course of any trade or industry which is discharged to the sewerage system. It includes water used in production, washing or cooling facilities, and covers both large and small premises, including healthcare premises, laundries etc. 2.2 Discharges to the public sewer are controlled by Scottish Water who issue Trade Effluent Consents. Any discharges to controlled waters (rivers, streams, estuaries etc.) are controlled by the Scottish Environment Protection Agency (SEPA), which issues Consents under the Control of Pollution Act (1974) (as amended). Permission needs to be obtained from SEPA to make a discharge direct to controlled waters. 2.3 Discharges from healthcare premises are categorised as liquid waste that requires to be treated, and for which a Trade Effluent Consent should be sought. The Trade Effluent Notice 2.4 The Trade Effluent Notice is the name used to describe the initial application form for Consent. It gives details about the healthcare premises and the nature and volume of the waste water discharge. The information detailed in the Trade Effluent Notice and ultimately the Consent may be influenced by data from Scottish Water site inspections, waste water quality analysis and water meter readings. 2.5 A Trade Effluent Notice can be obtained by contacting the Scottish Water Trade Effluent Quality Team via the Scottish Water Customer Helpline on 0845 601 8855. Trade Effluent Consent 2.6 Any healthcare body with a significant trade effluent discharge must obtain a Trade Effluent Consent (see paragraphs 3.3 3.6 inclusive). 2.7 A Consent is a legal document that sets limits on the volume and nature of the discharge. Scottish Water may carry out sampling to monitor whether or not the discharge complies with these limits, and follow their enforcement procedure in the event of serious breaches of the Consent conditions. Healthcare bodies should attempt to work with Scottish Water in partnership and improve discharges through cooperation rather than confrontation. Categories of waste water 2.8 By their very nature, different types of waste water require different treatments, with different cost implications. Version 1.0: March 2005 Page 5 of 25
clean and uncontaminated surface water (rainwater) can be drained into the nearest stream with no treatment. However, such discharges to the sea may require to be consented by SEPA (Scottish Environment Protection Agency); domestic waste water from staff facilities has to be treated to remove solids and contaminants, but its composition typically remains within known limits and does not require monitoring; trade effluents range from those with mild contamination to those heavily contaminated with metals, organic solids or oils. If these were not properly monitored and managed, they would have the potential to cause damage or harm to plant, people or the environment. This is why legislators initiated a separate control and charging system under the Sewerage (Scotland) Act 1968. Version 1.0: March 2005 Page 6 of 25
3. Trade Effluent and the Consent System 3.1 Scottish Water has a Trade Effluent Quality Team dedicated to the management of industrial effluents. In addition, Scottish Water has a dedicated Key Customer Team, which provides a relationship management service to large industrial and commercial customers including NHSScotland. 3.2 Scottish Water and its forerunners have historically worked together with NHSScotland to implement a system of control and charging which reflects the nature of effluent discharges from healthcare premises. 3.3 It is Scottish Water s policy to formally Consent industrial type discharges or discharges which may pose a risk to Scottish Water s infrastructure, personnel or the environment. Consenting policy follows a risk-based approach. Effluent discharges from healthcare premises are formally controlled through the Consent system. The bulk of discharge from healthcare premises does not represent a significant risk to Scottish Water operations and is therefore not usually subject to a formal Consent. 3.4 For guidance purposes, Scottish Water would consider formally Consenting a healthcare premises if the following minimum criteria are met: minimum water consumption of 2,500m 3 per annum; and one of the following: inpatient services; medical treatment provided on the site; any other NHS owned or leased premises having an industrial process eg laundry etc. However, if there is any doubt, NHSScotland Managers should contact the local Trade Effluent Quality Team. 3.5 Scottish Water policy states that: Scottish Water will issue a Consent where at least one of the following criteria is met: the discharge is considered to contain components which may be toxic or harmful to either Scottish Water personnel, infrastructure or treatment plants if not controlled; the discharge is likely to cause hydraulic problems in the sewers due to its volume or rate of discharge if not controlled; the discharge would represent a significant proportion of the flow or load placed on a treatment plant if not controlled; Version 1.0: March 2005 Page 7 of 25
the discharge is likely to interfere with the free flow of the sewers or their contents if not controlled; the discharge contains components which Scottish Water are required to control or remove by other governing legislation, e.g. Dangerous Substances (see Appendix 3). Should any of these criteria be met, a Consent for those specific premises only will be issued to protect Scottish Water s sewers and treatment plants. Scottish Water reserves the right to review the above criteria at any time. 3.6 In the event that none of the above criteria are met, then Scottish Water will class the discharge as either a non-domestic or commercial discharge which does not require to be controlled, and standard charging tariffs for that category will be applied. Version 1.0: March 2005 Page 8 of 25
4. The Consent The Consent details 4.1 Depending on what is appropriate, the Consent could include any of the following: limits on daily and hourly discharge volume; limits on the concentration of solids and organic matter, and on dangerous or harmful constituents; the basis for charging for the waste water, requirements for access to sampling points for Scottish Water, and for measuring and monitoring equipment to be provided by the healthcare organisation, and, where appropriate, various other requirements to ensure that environmental risk factors are properly managed. This could include, for example, evidence of a regular maintenance programme for chemical storage facilities or records of self monitoring being carried out; any other conditions that may be appropriate. 4.2 By agreement with Scottish Water, NHSScotland healthcare premises Consents contain specific limits on discharge volume, solids and organic content only. Consent requirements and limits 4.3 The conditions of a trade effluent Consent are set for many different reasons. Some concern the day to day safety and acceptability of the actual waste water discharge. Others ensure that pollution risks from, for example, stored oil or chemicals, are minimised. As described above, Scottish Water works with NHSScotland to minimise these risks. This is recognised by the relatively simple Consents that are issued to NHSScotland healthcare premises. Setting limits 4.4 There are several considerations which guide the limits Scottish Water set for chemicals in a waste water discharge. Scottish Water has to be confident that all of the following criteria are satisfied: 1. There must be no danger to people working in sewers (from fumes, toxins and so on). This applies particularly to chemicals which could create an explosive atmosphere, or vaporise to give adverse health effects. 2. There must be no deterioration to sewerage infrastructure, for example attack from sulphate or blockages from solids or greases. 3. Biological treatment should not be impaired by toxic substances such as metals, from extreme ph values or from an excess of organic load. Version 1.0: March 2005 Page 9 of 25
4. Scottish Water should abide by the spirit as well as the letter of the law in limiting the entry of contaminants to the environment, for example petroleum-based products, toxic metals, and persistent organic chemicals. 5. Scottish Water must follow the precautionary principle, for example with regard to endocrine disrupting chemicals (EDCs). 6. Scottish Water must ensure that the limits set using the above criteria are also consistent with its work towards a sustainable environment. 4.5 For each chemical there is usually just one of these criteria which is the most significant in determining the limit that should be set. 4.6 Scottish Water are confident that by working with NHSScotland on these issues there is currently no need to limit specific substances in NHSScotland healthcare premises discharges. Measuring compliance with Consent limits 4.7 Scottish Water does not currently routinely sample healthcare premises effluents, recognising that NHSScotland and Scottish Water are committed to working together to achieve good environmental management. This removes the requirement for individual action plans to improve any non-compliant discharges. (Refer to Section 5, Trade Effluent Charges, Cost Recovery and Section 6, Pollution Prevention Controls). Consent Changes 4.8 A Consent change can be initiated by Scottish Water or requested by NHSScotland staff. In either case, Scottish Water will follow the procedure for change that is set out by law. Firstly, Scottish Water will send the NHSScotland healthcare body a notice of the changes which are proposed, or have been requested. Note that 28 days are required (by law) for consultation. After this, Scottish Water will draw up a document called a direction, which specifies the changes to the Consent. However, again by law, these cannot come into force until at least 3 months after the date the direction is signed. 4.9 Scottish Water is introducing new style Consents to replace the existing Consents issued by the former Water Authorities. The new format will ensure a standard and consistent set of conditions for all trade effluent discharges. In most cases the local Scottish Water Trade Effluent Quality Team Adviser will meet with the appropriate person in the NHSScotland organisation, likely to be from Facilities or Estates, to discuss these changes. The process for introducing the new format of Consents follows the route detailed in the paragraph above. Consents for new developments 4.10 The NHSScotland healthcare premises representative (for example the Project Manager overseeing a development) should apply for Trade Effluent Consent in advance of the discharge commencing. This will ensure that there is available capacity to accept the new discharge and that any requirements for pre- Version 1.0: March 2005 Page 10 of 25
treatment, (such as monitoring equipment, screens or settlement tanks), can be built into the development rather than fitted later, which is likely to be more expensive. The initial contact should be as soon as possible after the decision has been taken to proceed with a new project. Scottish Water is permitted 3 months in which to consider new applications for Consent. Note: When planning new developments, designers, planners and project managers should seek guidance through the appropriate person in their NHS healthcare organisation (likely to be from Facilities or Estates), NHS National Services Scotland - Scottish Healthcare Supplies (SHS) and Scottish Water for details of Consents and Allowances. Version 1.0: March 2005 Page 11 of 25
5. Trade Effluent charges 5.1 Scottish Water publishes an annual Scheme of Charges which covers charges for water supply, surface water drainage and for the treatment and recycling of waste water. 5.2 Scottish Water publishes annual Trade Effluent Charges, which shows the value of the factors in the two Mogden formulae (see item 5.9 and Appendix 2) in use. A copy of this is sent to business customers annually. Mogden formulae are used throughout Britain. The Scottish Water Mogden formulae reflect the guidelines recommended jointly by the Confederation of British Industry and the National Water Council in 1976. 5.3 For information on current charges please contact the appropriate person within the healthcare organisation or visit the Scottish Water website: www.scottishwater.co.uk 5.4 Charges for collecting, treating and returning industrial waste water to the environment reflect the actual costs incurred by Scottish Water. Water and waste water charges act as an incentive to healthcare bodies to adopt good environmental practice. Charges encourage minimisation of water use and waste water discharge, and the separation of product or process chemicals from waste water. 5.5 Availability charges are due over the whole period of the Consent. Scottish Water has to allocate capacity to ensure that sewers do not overflow and that treatment works are not swamped by excess load or volume. Charging for the capacity reserved by each NHSScotland healthcare premises and organisation is the fairest way of dividing up Scottish Water s treatment capacity. It encourages healthcare premises and organisations to retain their appropriate level of treatment capacity thus freeing up Scottish Water s remaining capacity for other businesses. The operating charge formula covers the cost of actually treating the effluent, and is determined by its discharge volume and its composition. Allowances may be claimed for water that is lost e.g. through evaporation and is therefore not returned to the drain (see Appendix 1: Allowances Guidance and Waste Water/Trade Effluent Calculation Form). A burst/leakage allowance is a claim that relates to both water and waste water charges and may be awarded at the discretion of Scottish Water. Contact the Scottish Water Key Customer Manager on their Customer Helpline on 0845 601 8855 for further details. Calculating your own charges 5.6 Scottish Water can help healthcare bodies calculate their own charges. Each healthcare premises will have a fixed cost per day and a fixed cost per m 3 of trade effluent. Healthcare Facilities or Estates personnel should be able to give further guidance on this issue. Version 1.0: March 2005 Page 12 of 25
Sampling and analysis charges 5.7 NHSScotland and Scottish Water have agreed that routine sampling of NHSScotland healthcare premises discharges is currently unnecessary. This ensures that costs for both organisations are reduced. Samples and analysis requirements 5.8 In the event that sampling and analysis is required on a site, this should be carried out as follows: 24 hour composite samples should be obtained at each of the sampling points over a period of 7 days. All samples should be analysed for ph, Total Suspended Solids (Ss), Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) at a laboratory working to at least the following standard: International Standard ISO/IEC 17025 General Requirements for the Competence of Testing and Calibration Laboratories. Mogden charges for trade effluent 5.9 These charges cover the costs of providing and operating the waste water collection and treatment system. They pay for sewers, treatment works and processes and for sludge recycling. Full details of Mogden formulae charges are given in Appendix 2 however, to summarise, Mogden charges have four components or factors as described below: R (Reception costs) This covers costs associated with the sewerage system and is proportional to the volume of the discharge. V (Volumetric costs) This covers costs associated with preliminary and primary treatment facilities and any associated plant that is designed on a volumetric basis and is also proportional to the volume of the discharge. S (Solids costs) This covers costs associated with treating the sludge generated from primary treatment and is proportional to the suspended solids load in the discharge. B (Biological costs) This covers costs associated with biological (secondary) treatment facilities and is proportional to the organic load in the discharge. The amount due for each of these factors is summed to give the total amount due for an individual discharge. Version 1.0: March 2005 Page 13 of 25
Thus the total cost for a discharge = R + V + S + B Healthcare bodies pay for the level of treatment their effluent receives. In most catchments this will be full treatment including secondary treatment. However, there are a few areas where only primary treatment is given. In these areas, healthcare bodies do not pay costs based on the B factor. A few catchments provide only preliminary treatment, and in this case only R and V charges apply. Availability and operating charges 5.10 Scottish Water use two Mogden formulae, one covers an availability charge and the other an operating charge. The availability charge formula covers the cost of the capacity that Scottish Water reserves for a healthcare premises effluent in the sewerage infrastructure and treatment works. It is based on the healthcare premises Consent conditions for daily volume, suspended solids load and oxygen demand load. Recovery of additional costs 5.11 If a healthcare premises or its effluent can be shown to have caused events that result in additional costs to Scottish Water (for example, a blocked or damaged sewer), Scottish Water will recover these costs from the healthcare body. SEPA monitors discharges from Scottish Water treatment works and their charges reflect the degree of monitoring required. Where it can be clearly shown that the SEPA charge has been increased due to the activities of particular healthcare premises, this additional cost may be passed onto these healthcare bodies. The current agreement between NHSScotland and Scottish Water, reflected in this document, reduces the likelihood of such action being taken. Discharge strengths 5.12 For NHSScotland healthcare premises, Scottish Water has agreed the following strength parameters for Trade Effluent discharge for the period 1 April 2004 to 31 March 2006. St = fixed strength (solids) Ot = fixed strength (scod) 300mg/l 400mg/l 5.13 Scottish Water has agreed the above standard fixed strengths for all currently Consented healthcare premises discharges. These figures are based on sampling surveys at a number of healthcare premises. These agreed standard fixed strengths benefit healthcare premises by removing the liability for any costs and risks associated with sampling and the regular monitoring of healthcare premises discharges. 5.14 If a healthcare body can demonstrate that these figures are inappropriate for a particular premises e.g. by providing the results of a representative sampling survey, then Scottish Water will consider using that information to agree an alternative fixed strength. Version 1.0: March 2005 Page 14 of 25
Site visits, sampling and self monitoring 5.15 The current agreement removes the need for regular site visits, sampling and self monitoring at existing Consented premises. Use of records 5.16 NHSScotland healthcare bodies can demonstrate that they are following a good practice regime through retaining records of that regime and making them available for inspection for example, receipts for the emptying of an interceptor by an authorised waste disposal contractor, or for maintenance of effluent treatment plant. Version 1.0: March 2005 Page 15 of 25
6. Pollution Prevention Controls Procedures 6.1 Procedures should cover both day-to-day operations, such as maintenance of stored chemicals, and the actions to be taken in the event of accidents and emergencies. Staff must be aware of such procedures, be confident and competent to use them, and have ready access to any necessary equipment, such as sand to absorb oil spillages. 6.2 Environmental management systems such as Corporate GREENCODE can be very helpful in ensuring that such safeguards are developed, maintained and understood. Joint appraisal meetings 6.3 These are used to discuss and progress key issues such as Consent compliance and pollution risk assessment and management. Scottish Water provides advice on environmental best practice and pollution risk management. Where environmental improvements are required, Scottish Water will agree timescales for action with the healthcare body. Scottish Water can advise healthcare bodies on how to make best use of environmental consultancy and, in addition, where required, Scottish Water, working in partnership with NHSScotland, can develop the best match of services to provide solutions for water and waste water problems. The Scottish Water Key Customer Manager should provide further details. Drainage 6.4 Pollution can arise if individuals are unaware that there are two types of drainage the foul sewerage system and the surface water drainage system as described below: the foul sewerage system is designed to take waste water from toilets and washrooms, vehicle washing and industrial processes; surface water drains are usually sited on roads, yards or under roof water down-pipes, and are designed to take clean rainwater only. They may lead directly to streams or rivers that may support wildlife or fisheries. Any activity such as rinsing out dirty buckets, liquids from DIY type activities, and vehicle washing or maintenance will pollute the receiving watercourse. 6.5 NHSScotland healthcare bodies should ensure that their yard or road drains are never used for the disposal of waste waters. NHSScotland healthcare bodies should ideally colour-code their drains to clearly distinguish between foul and surface water drainage. This will help staff to avoid mistakes. Version 1.0: March 2005 Page 16 of 25
Dealing with pollution 6.6 Water pollution may occur at a continuous low level with many contributing minor sources. Alternatively, it may be a major incident, caused by an accident, vandalism or oversight. Notification of pollution may come from the healthcare premises responsible, members of the public, SEPA, or from our Scottish Water staff. Scottish Water always tries to trace pollution back to its source, and work to prevent it continuing or recurring. 6.7 The dumping of waste water or oil down road or yard drains is absolutely prohibited under the Sewerage (Scotland) Act 1968. Diffuse pollution 6.8 This is the name given to pollution that comes not from defined large sources but instead from a multitude of smaller points. The sum of these smaller sources can amount to a significant problem. For example, a burn may be obviously polluted with oil, but it may not be obvious as to what the source is. There may be many contributing sources, including run-off from roads, industrial yards or estates, and even from residential areas. It is not possible to control all small discharges and potential sources of pollution through the Consent system. Instead Scottish Water work will work with NHSScotland healthcare bodies and assist them in adopting good practice and pollution prevention techniques. Enforcement action 6.9 Appropriate enforcement action will be taken when considered necessary. Enforcement action addresses all forms of non-compliance and most usually concerns the quality or quantity of the Consented discharge. However, Scottish Water may also have to address any other requirement of the Consent that has not been met such as timely payment of charges, production of records, the existence of safety procedures or equipment, and so on. It is also used in the instance of large-scale pollution. Scottish Water enforcement action is a gradual process and consists of some, or all, of the following elements: clear notification to the healthcare body of any breach of the Consent, either in discharge quality, deficiencies in requested pollution risk management, or in failure to adhere to safety, administrative or any other requirements laid out in the Consent; additional monitoring by Scottish Water of the discharge and/or situation evaluation of the problems or risks that the breach or breaches may cause opportunities for the healthcare body to suggest action to be taken to remedy the situation; the definition of timescales within which a healthcare body must restore compliance with the Consent. In the event of any of the above approaches having failed, Scottish Water may report serious or persistent breaches of Consent to the Procurator Fiscal under the Sewerage (Scotland) Act 1968. 6.10 Under the present agreement the likelihood of the need for enforcement action and hence the risk of prosecution is much reduced. Version 1.0: March 2005 Page 17 of 25
Substances to be eliminated from the effluent 6.11 For guidance, Appendix 3 contains a list of substances to be eliminated from the effluent unless an exemption has been specifically authorised by Scottish Water. Exemptions must be registered with Scottish Water and are listed under 4.3 of the Consent document. The list in Appendix 3 contains a number of substances which may be produced in a healthcare setting and healthcare bodies should discuss the discharge of these materials with a Scottish Water Trade Effluent Quality Team Adviser. Additionally, there is a list of substances which should never be disposed of via the effluent system. These substances are extracted from The Dangerous Substances Directive 76/464/EEC. Future legislation 6.12 Environmental legislation is constantly changing and Scottish Water needs to comply with this legislation. National and European legislation forces ever tighter limits on discharges and requires Scottish Water to better manage its resources. The limits Scottish Water presently set on their Consents and the degree of pre-treatment Scottish Water require may change in the future. Scottish Water will endeavour to update NHSScotland of any change in environmental legislation that may affect healthcare premises discharges. Version 1.0: March 2005 Page 18 of 25
Appendix 1: Allowances Guidance and Waste Water/Trade Effluent Calculation Form Standard Deductions/Allowances Allowances for non-return to sewer will be agreed with Scottish Water for all healthcare premises on an individual, site by site basis from the metered water consumption, as follows: Calculated Domestic Deductions - based on Full Time Equivalents (FTEs) (To be charged as waste water) Staff - 25 litres/head/day or 5.75m 3 /head/annum. (Based on 46 weeks at 5 days) Catering Facilities - 25 litres/head/day or 5.75m 3 /head/annum (Based on 46 weeks at 5 days) Residential staff - 150 litres/head/day or 48.3m 3 /head/annum (Based on 46 weeks at 7 days) NHSScotland Calculated Allowances - based on non-returns to the sewer Steam Boiler Plant 5% Hot Water Plant 2% Laundries 0.45 litres per item Catering Allowance 1.0% Cooling Towers/Air Conditioning/Humidifiers 0.5% Incinerators 0.5% Allowances are set against the net water consumption i.e. total metered water less domestic deductions. The information used to determine the allowances has been gathered from healthcare premises across Scotland. Where specific information is available to establish greater allowances, e.g. a central cook/chill facility, healthcare bodies should contact the Scottish Water Trade Effluent Quality Team Adviser. The Full Time Equivalent staff (FTE) number and the number of staffed patient beds to be used in the Allowances Form is that as supplied by the Information Services Department of each NHSScotland Board. The remaining water, once domestic deductions and non return allowances have been deducted, is charged on the Trade Effluent tariff. Version 1.0: March 2005 Page 19 of 25
The following form is shown as an example. The form to be used is available electronically from the PEF web site. www.show.scot.nhs.uk/pef, or from your local Scottish Water Trade Effluent Adviser. This should be completed every 2 years, or earlier if significant changes have occurred on the healthcare premises. Example Scottish Water - NHSScotland 08/03/2005 Waste Water/Trade Effluent - Calculation Form Complete all the White boxes using the dropdown lists or by supplying the data requested. Hospital Address and Contact Details Trust Name Hospital name Lanarkshire Primary Care NHS Trust CLELAND HOSPITAL Contact Name Position Telephone Number John Dunlop Head of Technical Services 01698 377697 Hospital Details No. of Patient Beds Type of Boiler Plant Humidifiers 124 Steam No No. of Residential Staff Staff Canteen Laundry 0 Yes Yes No. of Full Time Equivalents Incinerator Air Conditioning Plant 295 No No Laundry Articles Main Kitchen 2500000 Yes Personal Laundry Articles Cooling Tower Calculated Non-return - m³ 25000 No 0 Non-returns Allowances Domestic Deductions/person/Annum Non-return Allowances m³ /Annum Steam Boilerplant 5% Staff 5.75 Hot Water Boilerplant 2% Canteen 2.875 Catering Allowance 1.0% Residential 48.3 Cooling Tower/Incinerator 0.5% Air Conditioning/Humidifiers 0.5% m³ /Annum litres/article Annual Water Usage 44000 Laundry & Personal Laundry 0.45 The Domestic Waste Water is the deductions for Staff, staff canteen and residential staff. This is charged on the Domestic Waste Water tariff. The Non-returns are calculated as a proportion of the Annual Water Usage less the Domestic. The Trade Effluent Volume is the Annual Water Usage less both the Domestic waste Water and the Non-returns allowances. Hospitals Domestic and Trade Effluent Proportions Domestic Waste Water 2544 Non-returns 3624 Trade Effluent 37832 Version 1.0: March 2005 Page 20 of 25
Appendix 2: Forumulae and abbreviations Mogden Formulae The formulae include a calculation for an operating charge and an availability charge as below: Daily Operating Charge, Co (p/m 3 ) - Variable Cost Co = Ro + Vo + Bo x (Ot/Os) + So x (St/Ss) x AVD Ro = Reception charge (p/m 3 ) Vo = Volumetric/Primary charge (p/m 3 ) Bo = Secondary Treatment charge (p/m 3 ) So = Sludge Treatment charge (p/m 3 ) Scottish Average Sewage Strength Os = settled Chemical Oxygen Demand (scod) [currently 350 mg/l] Ss = Total Suspended Solids [currently 250 mg/l] Parameters from Trade Effluent discharge AVD = Actual Volume Discharged St = fixed strength (solids) Ot = fixed strength (scod) Annual Availability Charge, Ca ( /year) - Fixed Cost Ca = CDV x (Ra + Va) + (Ba x sbodl) + (Sa x TSSl) x 365 Ra = Reception charge (p/m 3 /day) Va = Volumetric/Primary charge (p/m 3 /day) Ba = Biological capacity charge (p/kg/day) Sa = Sludge capacity charge (p/kg/day) The operating charge is a variable charge based on the actual volume and strength of the trade effluent discharged. The availability charge is a fixed cost (generally quoted in /day) and reflects the portion of the sewerage network and treatment process reserved in the sewerage system for the discharge. Scottish Water has introduced fixed waste water charges for non-domestic customers based on incoming water meter size. Trade Effluent customers pay a fixed charge via the availability element of the Trade Effluent charge plus separate fixed charge based on the notional meter size required to provide the volume of water used for domestic purposes. Version 1.0: March 2005 Page 21 of 25
Parameters from Trade Effluent Consent CDV = Consented Daily Volume sbodl = Settled Biochemical Oxygen Demand load TSSl = Total Suspended Solids load. Version 1.0: March 2005 Page 22 of 25
Appendix 3: Substances to be eliminated from the effluent Substances to be eliminated from the effluent (unless specifically authorised under Clause 4.3 of this Consent): coarse and fibrous material (this may include disposal pulp items and other macerated wastes including food wastes*); non biodegradable detergents (this may include laboratory, photographic and other chemical compounds); asbestos (crocidolite, actinolite etc); sludges arising from the pre-treatment of the effluent before discharge to the public sewer (this may include discharges from on-site water treatment); waste liable to form viscous or solid coatings, or deposits on or in any part of the sewerage system through which the effluent is to pass; petroleum spirit, or any other substance likely to produce explosive, flammable, harmful or toxic vapours in the sewerage system (this may include discharge either deliberate or accidental from fuel storage areas and it is recommended that precautions are put in place (eg bunding) to prevent the release of this material); organic solvents and degreasing agents; biocides, including pesticides, herbicides and fungicides (this may include disinfectants, certain medicinal products and ground maintenance chemicals); any substance defined under List I of the EC Directive The Dangerous Substances Directive 76/464/EEC, or included on the UK Government s Red List or prescribed substances under Schedule 5 of the Environmental Protection (Prescribed Processes and Substances) Regulations 1991, or other relevant legislation. * If food wastes are not macerated, suitable waste management procedures should be put in place to manage this waste stream. Reference should be made to waste management guidance, current and forthcoming Regulations including the Animal By-products (Scotland) Regulations 2003. The Dangerous Substances Directive 76/464/EEC List I This list contains certain individual substances which belong to the following families and groups of substances, selected mainly on the basis of their toxicity, persistence and bioaccumulation, with the exception of those which are biologically harmless or which are rapidly converted into substances which are biologically harmless as follows: 1. Organohalogen compounds and substances which may form such compounds in the aquatic environment. Version 1.0: March 2005 Page 23 of 25
2. Organophosphorus compounds. 3. Organotin compounds. 4. Substances in respect of which it has been proved that they possess carcinogenic properties in or via the aquatic environment. 5. Mercury and its compounds. 6. Cadmium and its compounds. 7. Persistent mineral oils and hydrocarbons of petroleum origin. and for the purposes of implementing Articles 2,8,9 and 14 of the Directive 8. Persistent synthetic substances which may float, remain in suspension or sink and which may interfere with any use of the waters. Version 1.0: March 2005 Page 24 of 25
Appendix 4: Leaflets from Scottish Water To assist healthcare premises in preventing pollution and accidents, Scottish Water has produced a series of leaflets covering topics such as fuelling installations, vehicle washing and chemical storage. Pollution Prevention Information Leaflets/Sheets Preventing pollution and blockages from commercial kitchens Preventing pollution from health-care: (GP surgeries, pharmacies, & nursing homes) Preventing pollution from construction, maintenance and demolition work Preventing pollution from above-ground oil storage tanks Preventing pollution using oil separators and BMPs Preventing pollution from high pressure water and steam cleaners Preventing pollution from fuelling areas Preventing pollution from garages Preventing pollution from household chemicals, domestic fuel oil and LPG Endocrine Disrupting Chemical Preventing pollution from household servicing and DIY Preventing pollution from printing processes Preventing pollution from photography and x-ray processing Preventing pollution from laboratories Preventing pollution from craft work Preventing pollution from scrap yards and tip sites Dealing with industrial waste water: a guide for architects, planners and engineers Preventing pollution from new connections to sewer Notes on the Trade Effluent Notice, and on providing a sampling point Wheeled Bin Cleansing Portable Toilet Disposal Version 1.0: March 2005 Page 25 of 25