Tralee Waste Water Treatment Plant

Transcription

1 Water Services Dept. Tralee Waste Water Treatment Plant Annual Environmental Report 2013 Licence Type: Waste Water Discharge Licence Licensee: Kerry County Council Licence Register Number: D Agglomeration Name: Tralee Reporting Period: 23rd August 2013 to 31st December 2013 Licence Period: 23rd August 2013 to 31st December 2013

2 Contents CONTENTS...2 SECTION 1.0 Section 2.0 INTRODUCTION AND EXECUTIVE SUMMARY TO THE 2013 AER...4 MONITORING REPORT SUMMARY Summary report on monthly influent monitoring Discharges from the agglomeration Ambient monitoring summary Data collection and reporting requirements under the Urban Waste Water Treatment Directive Pollutant Release and Transfer Register (PRTR).9 Section 3.0 Operational Reports Summary Treatment Efficiency Report Treatment Capacity Extent of Agglomeration Summary Report Complaints Summary Reported Incidents Summary Sludge/other inputs to the WWTP 12 SECTION 4 INFRASTRUCTURAL ASSESSMENTS AND PROGRAMME OF IMPROVEMENTS Storm Water Overflow Identification and Inspection report Report on progress made and proposals being developed to meet the improvement programme requirements SECTION 5 LICENCE SPECIFIC REPORTS Priority Substances Assessment Drinking Water Abstraction Point Risk Assessment...16 Page 2 of 36

3 5.3 Shellfish Impact Assessment Report Toxicity /Leachate Management Toxicity of the Final Effluent Report Pearl Mussel Measures Report Habitats Impact Assessment Report...17 SECTION 6 CERTIFICATION AND SIGN OFF...18 SECTION 7 APPENDICES...19 Appendix 7.1 LABATORARY RESULTS FOR INFLUENT & FINAL EFFLUENT DISCHARGES 19 Appendix AMBIENT MONITORING SUMMARY..21 Appendix Sewer Integrity Assessment Tool.22 Appendix Priority Substances Analysis...29 Appendix PRTR.32 Page 3 of 36

4 Section 1.0 Introduction and Executive Summary to the 2013 AER Introduction Tralee WWTP was built and commissioned in 1997 to provide preliminary, secondary and tertiary treatment of waste water prior to discharge to Tralee Bay. The combined effluent from the agglomeration collects at the Mulgrave Bridge and Lohercannon/Ballyvelly pumping stations. A flow of up to 6DWF is pumped to the gravity inlet sewer serving the Plant. A flow of up to 3DWF is treated at the plant and the remainder flows to the storm tank, with an overflow to the plant outfall. The plant was granted a waste water discharge licence, D , on the 23 rd of August This is the First AER for the plant. It covers the period from August December 2013 Tralee WWTP Process Description Preliminary Treatment. Incoming flows up to 475 l/s arrive at the inlet works. This consists of a new step screen with a 6mm aperture. There is a smaller rotating auger type screen to assist the step screen and to provide a standby in case of emergency. This is followed by a grit trap. Screenings and grit are collected in skips and disposed at the North Kerry landfill. Flows up to 237 l/sec (3DWF) continue to secondary treatment while the excess overflow to the storm tank. There is a facility to return the contents of the storm tank for secondary treatment. Secondary Treatment This consists of an anoxic tank to provide nitrification and three aeration basins. These are followed by three clarifiers. Aeration is achieved by a sub surface diffuse air system. Activated sludge from the clarifiers is returned to the aeration basins. Waste Activated sludge is pumped to a picket fence thickener. Thickened sludge is pumped to the sludge treatment area and supernatant liquid is returned to the aeration basins. Page 4 of 36

5 Tertiary Treatment UV treatment is provided to reduce the e-coli levels in the settled effluent. It comprises of twin banks of 60 UV lamps and associated controls. This was upgraded in 2013 to allow UV treatment of the full 3 x DWF (220/sec). Flow Measurement and Tidal holding tank. Flow from the UV treatment passes through a measurement flume. The composite sampler for the treated effluent is located in this area. This is followed by a tidal holding tank. This is designed to retain two hours flow during low tide. Sludge Treatment Sludge treatment consists of a picket fence thickener and sludge holding tanks. Dewatering is carried out using centrifuges. Sludge cake is taken off site for lime stabilisation and spreading on agricultural lands. Primary settling tanks, Trickling Filters and Sludge digester. The primary settling tanks, Trickling filters and sludge digester were not used in 2013 as they compromised the hydraulic loading for the plant. Arrangements were made to use one of the primary settling tanks as a leachate balancing tank. This will commence operation in Process Improvements in 2013 The Tralee Wastewater Treatment Plant has never been capable of treating its design hydraulic load. Significant improvements were carried out in 2013 to improve the hydraulic capacity. These included A new inlet screen Additional hydraulic capacity in the UV treatment. These were commissioned in November/December It is hoped to show a significant increase in the hydraulic performance of the plant in Page 5 of 36

6 Executive Summary This AER covers the period 23 August to 31 December. Therefore not all of the annual AER requirements are included. The combined nature of the sewer collection system from the Tralee Agglomeration results in a very dilute influent to Tralee WWTP. It also results in a significant fraction of the sewage from the agglomeration overflowing and thus not receiving appropriate treatment. Based on period of dry weather the estimated BOD loading from the Agglomeration is 24,000 p.e. The average annual p.e. treated at the WWTP is measured at 16,461. This would indicate that 31% of BOD loading from the Agglomeration is not receiving treatment. It period of wet weather the average treated P.E. can be as low as 9,000. The effluent treated at the WWTP is within the ELV s set out in the discharge licence. One ammonia result was in excess of the ELV (allowable under section A4 of the WWDL). The ammonia levels/plant treatment process will be carefully monitored in 2014 to assess the ammonia reduction. The ambient monitoring results for the receiving waters would indicate poor quality. The receiving waters are also influenced by the untreated effluent fraction and other sources of pollution. This will be furthered monitored in The storm overflows are required to comply with the DoEHLG guidelines by the December The study required to achieve this will need to be commenced early in 2014 to achieve this deadline Page 6 of 36

7 Section 2.0 MONITORING REPORT SUMMARY 2.1 Summary report on monthly influent monitoring Number of Samples Annual Max Annual Mean BOD (mg/l) COD (mg/l) SS (mg/l) Total P (mg/l) Total N (mg/l) Hydraulic Loading (m3/d) Organic Loading (PE/day) ,270 26, ,062 12,905 Interpretation of Results: The influent from the Tralee Agglomeration is quite dilute owing to the combined nature of the collection system. This also reflected in the low annual mean hydraulic loading in PE terms. 2.2 Discharges from the agglomeration Parameter ph BOD (mg/l) WWDL ELV (Schedule A) ELV with Condition 2 Interpretation included Number of sample results Number of sample results above WWDL ELV Number of sample results above ELV with Condition 2 Interpretation included Mean (for parameters where a mean ELV applies) Overall Compliance (Pass/Fail) * ELV not set in the WWTP Licence COD (mg/l) SS (mg/l) Total Oxidised Nitrogen (as N) Ammonia (as N) Total Nitrogen as N Comment * None N\A N\A N\A None None N\A None N\A None N\A None Pass Pass Pass Pass Pass Pass Pass N\A Page 7 of 36

8 WWDL ELV (Schedule A) ELV with Condition 2 Interpretation included Number of sample results Number of sample results above WWDL ELV Number of sample results above ELV with Condition 2 Interpretation included Mean (for parameters where a mean ELV applies) Overall Compliance (Pass/Fail) Total Phosphorus (as p) * ELV not set in the WWTP Licence Orthophosphate (as P) Faecel Coliforms Escherichia coli Intestinal Enterococci Visual Inspection Comment * * * * * * None N\A N\A N\A N\A N\A N\A None None N\A N\A N\A N\A N\A N\A None N\A N\A N\A N\A N\A N\A None N\A N\A N\A N\A N\A N\A None Pass Pass Pass Pass Pass Pass N\A Interpretation of Results: The results from the treated effluent were within the ELV limits for the plant except for one ammonia result. This can be caused by low dissolved oxygen and/or high mixed liquor suspended solids/sludge age within the plant. Measures to improve these factors are included in the programme of improvements in section 4 of this AER 2.3 Ambient monitoring summary Ambient Monitoring location from WWDL Tralee Bay Tralee Bay Tralee Bay Grid Ref E79826 N E79796 N E81225 N EPA Feature Coding Tool code TW LT002 TW LT1003 TW LT1001 Does assessment of the ambient monitoring results indicate that the discharge is impacting on water quality? See interpretation below See interpretation below See interpretation below Page 8 of 36

9 Interpretation of Ambient Monitoring Results: Only one set of results has been taken at the designated ambient monitoring sites. This is due to the difficulties in organising a suitable boat that met Kerry Co Council s insurance/safety requirements. The results show a poor water quality at these locations. However it is not possible to attribute the poor water quality to the outfall from Tralee WWTP as other factors need to be taken into account, namely untreated discharges from the Tralee Agglomeration and the effects of the rivers that drain into Tralee Bay. 2.4 Data collection and reporting requirements under the Urban Waste Water Treatment Directive This data has been forwarded via electronic submission to WasteWaterReturns@epa.ie on the 25 th February Pollutant Release and Transfer Register (PRTR) This data has been submitted electronically to Eden on 3 rd March A copy of the PRTR is attached in Appendix 5 Page 9 of 36

10 Section 3.0 Operational Reports Summary 3.1 Treatment Efficiency Report cbod (kg/yr) COD(kg/yr) SS (kg/yr) Total P(kg/yr) Total N(kg/yr) Influent Mass loading (kg/yr) Effluent Mass loading(kg/yr) % efficiency 88% 76% 73% 3% 17% Please note that the loadings are from the date of grant of the licence (23 Aug 13) and not for the full year 3.2 Treatment Capacity Hydraulic Capacity As Constructed (m3/day) 14,270 (available capacity in period covered by this AER) Hydraulic Capacity Current loading (m3/day) 14,270 Hydraulic Capacity Remaining (m3/day) 0 Organic Capacity - / As Constructed (PE) 40,000 Organic Capacity - Current loading (PE) 26,162 Organic Capacity Remaining (PE) 13,838 Will the capacity be exceeded in the next three years? (Yes / No) Y Page 10 of 36

11 The Tralee WWTP never achieved its design hydraulic loading (20,476 cum/day). Improvements carried out in 2013 should ensure that the plant achieves a higher hydraulic performance in The hydraulic load from the Tralee Agglomeration is in excess of the design 3 x DWF, therefore there is no spare hydraulic capacity. 3.3 Extent of Agglomeration Summary Report % of Total Load Generated in the Agglomeration Load generated in the agglomeration that is collected in the sewer network 100% Load collected in the agglomeration that enters the treatment plant 60% Load generated in the agglomeration going to individual and appropriate treatment systems 0% Load collected in the agglomeration that is not collected and not individually treated 0% 3.4 Complaints Summary Number Date & Time Nature of Complaint 1 30/10/13 Complaint received about noise at night. Cause of Complaint Noise came from sludge treatment facility Actions taken to resolve issue Process changed immediately on 30/10/13 to stop source of noise. Closed (Y/N) y Page 11 of 36

12 3.5 Reported Incidents Summary Date & Time None Incident Description Cause Corrective Action Authorities Contacted Note 1 Reported to EPA (Yes/No) Closed (Y/N) Number of Incidents in Number of Incidents reported to the EPA in 2013 Explanation of any discrepancies between the two numbers above 0 None 3.6 Sludge/other inputs to the WWTP Figures quoted are for the calendar year 2013 Input Type M3/yr PE/yr % load Domestic /Septic Tank Suldge % Industrial/commercial sludge % Landfill Leachate by tanker 68, % Landfill leachate by sewer network 0 Sludge from KCC treatment Plants % Page 12 of 36

13 Section 4 Infrastructural Assessments and Programme of Improvements 4.1 Storm Water Overflow Identification and Inspection report Not required in the first AER, this information will be submitted in the 2 nd AER SWO Identification and Inspection Summary Report (Table A) Code Irish Grid Reference SW002 SW003 SW004 SW005 SW006 SW007 SW008 SW009 SW010 SW011 SW012 E N E N E84498 N E N E N E N E N E N E N E N E E Included in Schedule A4 of the WWDL Compliance With DoEHLG Criteria No of Times Activated In 2013 Total Volume Discharged in 2013(PE) Estimated/ Measure Data Y N Unknown Unknown N\A Y N Unknown unknown N\A Y N Unknown Unknown N\A Y N Unknown Unknown N\A Y N unknown unknown N\A Y N Unknown unknown N\A y n Unknown Unknown N\A Y N Unknown Unknown N\A Y N Unknown Unknown N\A Y N Unknown Unknown N\A Y N Unknown Unknown N\A Page 13 of 36

14 SWO Identification and Inspection Summary Report (Table B) (Estimated Figures) How much sewage was discharged via SWOs in the agglomeration in 2013 m3/yr 830,813 How much sewage was discharged via SWOs in the agglomeration in 2013 (pe) 9,600 What % of the total volume of sewage generated in the agglomeration was discharged via SWO s in % Is each SWO identified as non compliant with DoEHLG Guidance included in the programme of improvements Y The SWO assessment includes the requirements of Schedule A3 & C3 N/A Have the EPA been advised of any additional SWO s /changes to Scdedule C3 and A4 under condition 1.7 No 4.2 Report on progress made and proposals being developed to meet the improvement programme requirements. Specified Improvements WWDL Upgrade Storm Overflows to Comply with DoEHLG Document on Overflows WWDL Schedule A or C Licence Completion Date Date expired C 31/12/2015 No Status of works Not started % Construction Work Complete 0 Licensee Timeframe for Completing The work At IW discretion Comments Subject to Irish Water Funding Page 14 of 36

15 Programme of Improvements No Description Reason Timeframe 1 Study of the existing drainage network to achieve the following Assess storm overflows Reduce the volume of wastewater going to overflows Identify areas where separation of surface and foul waters can take place Eliminate flooding due to surcharging sewers Provide flood relief measures(combined drainage network) To reduce the volume of effluent going to overflow At Irish Water s Discretion 2 Provide standby air blower at the Tralee WWTP 3 Replace flowmeter at Mulgrave Bridge Pumping station 4 Increase capacity in the sludge treatment. 5 Provide a sludge reception system for sludge transported from surrounding villages 6 Provide 280 m of new 500mm sewer in Brewery road area Reduce risk of ELV failure due to mechanical breakdown Provide more information on flow volumes/pump efficiency Reduce risk of ELV failure due to high MLSS/sludge age in the plant Reduce risk of ELV failure due to high MLSS/sludge age in the plant Eliminate sewer surcharging and flooding in this area At Irish Water s Discretion At Irish Water s Discretion At Irish Water s Discretion At Irish Water s Discretion At Irish Water s Discretion Sewer Integrity Assessment Tool Summary Table Risk Assessment Risk Assessment Reference to AER Rating Score Hydraulic risk assessment score H 150 Appendix 3 Environmental risk assessment score H 500 Appendix 3 Structural risk assessment score H 150 Appendix 3 Operation and management Risk assessment score H 200 Appendix 3 Overall risk score for agglomeration H 100 Appendix 3 Page 15 of 36

16 Section 5 Licence Specific Reports Licence Specific Reports Summary Table Licence Specific Report Required in 2013 AER Included in 2013 AER Location in 2013 AER Priority Substances Assessment Yes Yes Appendix 4 Drinking Water Abstraction Point Risk N/A N/A N/A Assessment Habitats Impact Assessment N/A N/A N/A Shellfish Impact Assessment Toxicity / Leachate Management yes No, No (this AER refers to the period from Aug 23 to 31 Dec) No (this AER refers to the period from Aug 23 to 31 Dec) N/A N/A 5.1 Priority Substances Assessment A priority substance analysis was carried out on the treated effluent from Tralee WWTP. This included the following substances identified from the current Trade Discharge licences to the Tralee collection network Arsenic Cadmium Chromium Copper Lead Mercury Nickel Zinc All of the substances tested were well below the maximum allowable values. This would indicate that priority substances are not impacting on the receiving waters. The results of the analysis are contained in the Appendix Drinking Water Abstraction Point Risk Assessment. Drinking Water Abstraction Point Risk Assessment summary table: Licensee self- assessment checks to determine whether all relevant information is included in the Assessment. Is a Drinking Water Abstraction Risk Assessment required in the No 2013 AER (or outstanding from a previous AER) Page 16 of 36

17 5.3 Shellfish Impact Assessment Report. This AER refers to the period from Aug 23 to 31 December The shell fish impact assessment was not commenced owing to the stormy weather in late Toxicity /Leachate Management Is a toxicity /Leachate Management report required in the 2013 AER No What % of the total influent is leachate 1.7% 5.5 Toxicity of the Final Effluent Report. Toxicity of the final effluent assessment summary table: Is a Toxicity report required? (Condition 4) Yes / No 5.6 Pearl Mussel Measures Report Pearl Mussel Measure Report summary table (check licence condition to see which format is appropriate): Is a progress report on implementation of the findings of Pearl Mussel Protection Measures report required in the 2013 AER (or outstanding from previous AER) No 5.7 Habitats Impact Assessment Report Habitats Impact Assessment summary table: Is a Habitats Assessment required in the 2013 AER (includes outstanding assessments from previous years)? No Page 17 of 36

18 Section 6 Certification and Sign Off Does the AER include an executive summary Yes Does the AER provide an assessment of the performance of the WWTP Yes Is there a need to advise the EPA for consideration of a technical amendment/review of the licence No Is there a need to request/advise the EPA of any modifications to the existing WWDL No Are all outstanding reports and assessments from previous AER s included as an appendix to this AER N/A List of outstanding reports Shellfish impact assessment report 2014 I certify that the information provided in this AER is accurate and representative. Oliver Ring Director of Services Page 18 of 36

19 Section 7 Appendices Appendix 7.1 LABATORARY RESULTS FOR INFLUENT & FINAL EFFLUENT DISCHARGES A.E.R INFLUENT RESULTS Tralee WWTP Date BOD COD S.S Total Nitrogen Total Phosphorous mg/l mg/l mg/l mg/l mg/l 12/09/ /09/ /10/ /11/ /12/

20 A.E.R EFFLUENT RESULTS TRALEE WWTP Date Ph BOD COD S.S. T.O.N. Ammonia (As N) Total Nitrogen (As N) Total Phosphorous (As P) Orthophosphate (As P) Faecal Coliforms Escherichia Coli ph units mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l cfu/100ml 12/09/ /09/ /10/ /10/ /10/ /11/ /11/ /11/ /12/ /12/ /12/ Page 20 of 36

21 Appendix AMBIENT MONITORING SUMMARY EDEN CODE Ambient Monitoring location from WWDL Date Time D.O. mg/l Temp. C NH4 mg/l BOD mg/l ph TON Enterococci MPN/100ml Faecal MPN/100ml Ecoli MPN/100ml TW LT /12/ : < TW LT /12/ : < TWI LT /12/ : < Page 21 of 36

22 Appendix Sewer Integrity Assessment Tool

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29 Appendix Priority Substances Analysis Projec t Tralee Project Reference Locatio n TP1300D004 0 Effluent Location Reference TPEFF1300D0040SW0 01 Sample Template WW licensing requirements discharge Priority subs Sample Referenc e 2013/338 9 Sampl e Date Sampl e Time Sampl e Metho d 07- Aug-13 10:15 Grab Sampled By David Lenihan Reason Complianc e Comment s Parameter Max. Target Min. Units Chromium Cr ug/l Copper Cu mg/l Arsenic As ug/l Lead Pb ug/l Zinc Zn ug/l Mercury Hg ug/l Nickel Ni ug/l barium Ba ug/l Boron B mg/l Selenium Se ug/l Tralee WWTP Effluent < 0.2

30 Cadmium Cd ug/l Vanadium V ug/l Antimony Sb ug/l molybdenum Mo metals ug/l tin Sn metals ug/l cobalt metal ug/l Atrazine pest triazine ug/l Simazine Pest triazine ug/l Toluene VOC ug/l TriButylTin TBT ug/l Flouride F mg/l Xylenes Xylene ug/l Cyanide Free CN ug/l Dichloromethane VOC ug/l Benzene VOC ug/l Chloroform THM ug/l 1 2 Dichloroethane C2H4Cl ug/l Benzo(a)pyrene PAH ug/l Benzo(b)Flouroanthene PAH ug/l Benzo(k)Flouranthene PAH ug/l Fluroanthene (PAH) PAH ug/l indeno(1,2,3-cd)pyrene PAH ug/l benzo(ghi)perylene PAH ug/l < 0.5 < 1 < < 1 1 < 0.05 < 0.05 < 0.5 < < 0.5 < 25 < 0.5 < < 1 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < Page 30 of 36

31 Tetrachloroethene VOC ug/l Trichloroetheylene VOC ug/l Trichlorobenzenes VOC ug/l 2,4 D acid herb ug/l Ethyl Benzene VOC ug/l MCPA acid herb ug/l Mecoprop(total) acid herb ug/l Aldrin pest ug/l Dieldrin Pest ug/l Bis(2- ethylhexyl)pthalate DEHP ug/l Diuron Pest ug/l Linuron Pest ug/l Isodrin Pest ug/l Isoproturon Pest ug/l Napthalene SVOC ug/l Polychlorobiphenyls (as Alachlors) PCB ug/l Carbon Tetrachloride CCL ug/l Glyphosate pest ug/l Dichlorobenil OC pest ug/l Chlorobenzene chlorobenzenes ug/l Hexachloeobutadiene VOC ug/l Total Phenols Phenolic ug/l 2,6 Dichlorobenzamide benzamides ug/l 0.1 < 1 < 1 < 0.03 < 0.5 < 0.05 < 0.04 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < < 0.04 < < 0.05 < 0.5 < < 0.1 Page 31 of 36

32 Appendix PRTR Page 32 of 36

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