Delvin Wastewater Treatment Plant

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2 Delvin Wastewater Treatment Plant WWDL No. D ANNUAL ENVIRONMENTAL REPORT 2011 County Buildings Mullingar Co. Westmeath Phone: Fax:

3 Delvin Waste Water Discharge Licence (EPA Ref: D ) Annual Environmental Report 2011 Local Authority Westmeath County Council Project Title Delvin Waste Water Discharge Licence Document Title Annual Environmental Report 2011 File Saneng:\Waste Water Discharge Regulations & Applications\AER Submissions\Delvin.doc Date Prepared By Checked By Approved By Revision 16 March 2012 M. Makura M. Cox M. Cox 1 2

4 TABLE OF CONTENTS Declaration 1. Introduction 2. Executive Summary 4 3. Discharges from the Agglomeration Influent monitoring Effluent monitoring Ambient monitoring Mass Loading Waste Water Treatment Plants Efficiencies Data collection and reporting requirements under the UWTD Pollutant Release and Transfer Register (PRTR) 6 4. Complaint and Incident Reports 4.1 Introduction Complaints summary Reported incidents summary 7 5. Infrastructural Assessments and Programme of Improvements Introduction Treatment capacity Storm water overflow identification and inspection report Report on progress made and proposals being developed to meet the improvement programme requirements 8 6. Environmental Liability and Financial Provisions Annual statement on prevention of environmental damage Environmental liabilities risk assessment (ELRA) 8 7. Specialist Report Development / Infrastructural works summary Screening for Priority Substances 8 8. Appendixes 9 3

5 1.0 INTRODUCTION In accordance with Schedule D of the Wastewater Discharge Licence Ref No D , the following Annual Environmental Report covers the period January 2011 to December This is the first Annual Environmental Report submitted to the Agency for the Delvin Wastewater Treatment Plant and agglomerations. The format of the report has taken into consideration the Environmental Protection Agency Guidance Document on the Preparation of the 2011 Annual Environmental Report (A.E.R.) for Waste Water Discharge Licences. 2.0 Executive Summary This Annual Environmental Report relates to the requirements of the Discharge Licence Ref D for the Delvin Town and agglomeration. The design population equivalent (P.E.) of the Delvin Wastewater Plant is 1,250 and the actual measured organic population equivalent for 2011 is 950. The Delvin network consists of a 225mm diameter combined sewer. The treatment plant, located in the townland of Southhill, consists of an extended aeration, activated sludge process with denitrification and chemical phosphorus removal. The primary discharge from the treatment plant is to the River Stonyford. The Delvin agglomeration is situated to the northeast of county Westmeath and incorporates the majority of the village of Delvin. The waste water treatment plant (WWTP) is sited close to and discharges to the Stonyford River. A Wastewater Discharge Licence was granted by the Environmental Protection Agency (EPA) to Westmeath County Council for the Delvin WWTP on 15 th December, Under Condition 6 of the granted licence, an Annual Environmental Report shall be submitted to the EPA by the 28 th February of each year. This report is the first Annual Environmental Report completed for the Delvin WWTP under the granted licence D Discharge from the Agglomeration The following section of the report is a synopsis of the monitoring results from discharges that are monitored in accordance with the discharge licence D Influent Monitoring In accordance with condition 4 schedule B: Monitoring of influent. Appendix 1 presents the influent monitoring data for the period January 2011 to December 2011 The average monthly flows and quality of the influent are presented in Appendix 3.The results show the Delvin Wastewater Treatment plant has an daily average flow of 388 m3/d and a hydraulic population equivalent (P.E.) of 1, Effluent Monitoring. In accordance with condition 4 schedule B: Monitoring of the Effluent. Appendix 3 presents the effluent monitoring data for the period January 2011 to December A total of 12 samples were taken of the final effluent during 4

6 the period January 2011-December During the sampling period nine of the samples exceeded the emission limit values 6 for orthophosphate, 2 Suspended Solid and 1 for COD. All these excedences occurred before the license was issued and therefore where not notified to the EPA 3.3 Ambient Monitoring of the Receiving Water The ambient monitoring of the receiving water was carried out in accordance with Schedule B4: of the Wastewater Discharge Licence D The results are presented in Appendix 4, upstream monitoring data for sampling station asw1u and the downstream monitoring data for sampling station asw1d. The arithmetic mean for the water quality parameters tested indicate that the receiving water upstream of the primary discharge point is in compliance with the good water quality status of the European Communities Environmental Objectives ( Surface Waters) Regulations, 2009 (S.I. No 272 of 2009) and results show that the arithmetic mean for the parameters tested downstream of the primary discharge show that the primary discharge point is have a very slight to negligible impact on surface water quality of the Stonyford River. 3.4: Mass Loadings. The monthly mass loadings from the primary discharge point to the river Stonyford are presented in Table 1. Daily Flow m 3 /day Average Daily B.O.D kg/day Average Daily C.O.D kg/day Average Daily S.S. kg/day Average Daily T.N. kg/day Average Daily T.P. kg/day 19/01/ /02/ /03/ /04/ /05/ /06/ /07/ /08/ /09/ /10/ /11/ /12/ Av. Daily Total Mass Emission to Stonyford River ,450 m 3 /year 660 kg/year 4,134 kg/year 2,165 kg/year 953 kg/year 141 kg/year 5

7 3.5 Waste Water Treatment Plant Efficiency Table 2, presents the treatment efficiency for the Delvin Wastewater Treatment plant. The wastewater treatment plant complies with the requirements of the Urban Wastewater Urban Waste Water Regulation SI No: 254 of BOD% COD% S.S.% T.N.% T.P.% 19/01/ /02/ /03/ /04/ /05/ /06/ /07/ /08/ /09/ /10/ /11/ /12/ SI 254 of 2001 minimum % reduction 70-90% 75% 90% 70-80% 80% Average % reduction for sampling period 91.73% 85.27% 73.00% 70.38% 62.11% 3.6 Data Collection and Reporting Requirements under the Urban Waste Water Treatment Directive The report for the Urban Wastewater Treatment Directive data collection and report submission shall be forwarded to the Environmental Protection Agency as part of the above Directive requirements. 3.7 Pollutant Release and Transfer Register (PRTR) - Report for Previous Year. Pollutant Release and Transfer Register (P.R.T.R.) report is not required since the WWTP was newly licensed in Q4 of Pollutant Release and Transfer Register Proposal for Current Year. Pollutant Release and Transfer Register (P.R.T.R.) report is not required since the WWTP was newly licensed in Q4 of

8 4 COMPLAINT AND INCIDENT REPORTS 4.1 Introduction The following tables summarises the complaints and incidents recorded on Delvin WWTP 4.2 Complaints Summary Date & Time Name of Nature of Response of Closed Y/N Complainant Complainant Complainant N/A N/A N/A N/A N/A There have been no recorded complaints during the reporting period from January 2011 to December Reported Incidents Summary Date & Time Incident DescriptionAuthorities Contacted Corrective Action Closed Y/N N/A N/A N/A N/A N/A There have been no recorded complaints during the reporting period from January 2011 to December INFASTRUCTURAL ASSESSMENTS & PROGRAMME OF IMPROVERMENTS 5.1. Introduction The following section of the report is includes an assessment of the organic and hydraulic treatment capacity with the wastewater works, storm water overflow identification and the progress report on the program of improvements previously submitted to the Agency as part of the wastewater discharge licence application process Treatment Capacity The Average daily flow at the Delvin WWTP was 388m³/day with the average strength of the influent in terms of BOD was 147mg/l for results taken in The Urban Waste Water Treatment Regulations define that one population Equivalent (PE) is equal to 60g of BOD. A figure of 225 litres per person was used to determine the hydraulic loadings. BOD Loadings 388m 3 / day mg / l PE 60g 1000 PE = 950 7

9 Hydraulic Loadings 388m 3 / day 1000 PE 225l / person / day PE = 1, Storm Water Overflow Identification and Inspection Report In accordance with condition this report is due to be submitted as part of the 2012 AER and is to be submitted to the Agency by 28 th February Report on Progress made and Proposals Being Developed to Meet the Improvements Programme Requirements. There was no development or infrastructural works carried out during the AER period January 2011 to December ENVIRONMENTAL LIABILITY AND FINANCIAL PROVISIONS 6.1 Environmental Liabilities Risk Assessment (ELRA) There are no additional measures adopted during the reporting period. Under condition of the granted WWDL Environmental Liabilities Risk Assessment is required to be completed and included in the AER report. This report is due to be submitted as part of the 2012 AER and is to be submitted to the Agency by 28 th February LICENCE SPECIFIC REPORTS 7.1 Development/Infrastructural Works Summary In accordance with condition 5.1 this report is due to be submitted as part of the 2012 AER and is to be submitted to the Agency by 28 th February Screening for Priority Substances Screening for Priority Substance report is not required since the WWTP was newly licensed in Q4 of Improvement Programme Requirements. There are no specified Improvement programs in Schedule C of the license. 8

10 Appendix 1: Influent Monitoring Data. Delvin Waste Water Treatment Works EPA Waste Water Discharge Licence D Date of Sample cbod (mg/l) COD (mg/l) Total Suspended Solids Total Nitrogen (mg/l) Total Phosphorus (mg/l) 19/01/ /02/ /03/ /04/ /05/ /06/ /07/ /08/ /09/ /10/ /11/ /12/

11 Appendix 2: Average Monthly Flow and Population Equivalent. Average Daily Flow m 3 /day Average Daily Organic P.E Average Daily Hydraulic P.E January ,767 February ,062 March ,268 April ,026 May June ,136 July 235 1,479 1,046 August 332 1,067 1,476 September ,533 October 423 1,415 1,878 November ,579 December ,984 Av. Daily ,726 10

12 Appendix 3: Effluent Monitoring Data. Delvin Waste Water Treatment Works EPA Waste Water Discharge Licence D Schedule B1: Monitoring of Primary Waste Water Discharge ph Primary Discharge Point SW1 Emission Limit Valve (ELV): Date ph ELV Comply 19/01/ Yes 10/02/ Yes 29/03/ Yes 20/04/ Yes 25/05/ Yes 22/06/ Yes 13/07/ Yes 24/08/ Yes 28/09/ Yes 27/10/ Yes 23/11/ Yes 15/12/ Yes 11

13 Conductivity Primary Discharge Point SW1 Emission Limit Valve (ELV): 1500 Date Conductivity ELV Comply 19/01/ N/A N/A 10/02/ N/A N/A 29/03/ N/A N/A 20/04/ N/A N/A 25/05/ N/A N/A 22/06/ N/A N/A 13/07/ N/A N/A 24/08/ N/A N/A 28/09/ N/A N/A 27/10/ N/A N/A 23/11/ N/A N/A 15/12/ N/A N/A 12

14 EPA Waste Water Discharge Licence D Schedule B1: Monitoring of Primary Waste Water Discharge Carbonaceous Biochemical Oxygen Demand (cbod) Primary Discharge Point SW1 Emission Limit Valve (ELV): 20mg/l Date cbod ELV(mg/l) Comply 19/01/ Yes 10/02/ Yes 29/03/ Yes 20/04/ Yes 25/05/ Yes 22/06/ Yes 13/07/ Yes 24/08/ Yes 28/09/ Yes 27/10/ Yes 23/11/ Yes 15/12/ Yes 13

15 Chemical Oxygen Demand (COD) Primary Discharge Point SW1 Emission Limit Valve (ELV): 125mg/l Date COD ELV(mg/l) Comply 19/01/ Yes 10/02/ Yes 29/03/ Yes 20/04/ Yes 25/05/ No 22/06/ Yes 13/07/ Yes 24/08/ Yes 28/09/ Yes 27/10/ Yes 23/11/ Yes 15/12/ Yes 14

16 EPA Waste Water Discharge Licence D Schedule B1: Monitoring of Primary Waste Water Discharge Primary Discharge Point Emission Limit Valve (ELV): Suspended Solid (SS) SW1 25mg/l Date SS mg/l ELV(mg/l) Comply 19/01/ Yes 10/02/ No 29/03/ Yes 20/04/ Yes 25/05/ Yes 22/06/ Yes 13/07/ Yes 24/08/ Yes 28/09/ Yes 27/10/ No 23/11/ Yes 15/12/ Yes 15

17 Primary Discharge Point Emission Limit Valve (ELV): Total Nitrogen (N) SW1 N/A Date N ELV(mg/l) Comply 19/01/ N/A N/A 10/02/ N/A N/A 29/03/ N/A N/A 20/04/ N/A N/A 25/05/ N/A N/A 22/06/ N/A N/A 13/07/ N/A N/A 24/08/ N/A N/A 28/09/ N/A N/A 27/10/ N/A N/A 23/11/ N/A N/A 15/12/ N/A N/A 16

18 EPA Waste Water Discharge Licence D Schedule B1: Monitoring of Primary Waste Water Discharge Ammonia (N) Primary Discharge Point SW1 Emission Limit Valve (ELV): 3mg/l Date N ELV(mg/l) Comply 19/01/ Yes 10/02/ Yes 29/03/ Yes 20/04/ Yes 25/05/2011 <1 3 Yes 22/06/ Yes 13/07/ Yes 24/08/ Yes 28/09/ Yes 27/10/ Yes 23/11/ Yes 15/12/ Yes 17

19 Primary Discharge Point Emission Limit Valve (ELV) Total Phosphorus (P) SW1 :N/A Date P ELV(mg/l) Comply 19/01/ N/A N/A 10/02/ N/A N/A 29/03/ N/A N/A 20/04/ N/A N/A 25/05/ N/A N/A 22/06/ N/A N/A 13/07/ N/A N/A 24/08/ N/A N/A 28/09/ N/A N/A 27/10/ N/A N/A 23/11/ N/A N/A 15/12/ N/A N/A 18

20 EPA Waste Water Discharge Licence D Schedule B1: Monitoring of Primary Waste Water Discharge Primary Discharge Point Emission Limit Valve (ELV) Orthophosphate (P) SW1 :1mg/l Date P ELV(mg/l) Comply 19/01/ Yes 10/02/ Yes 29/03/ No 20/04/ No 25/05/ No 22/06/ Yes 13/07/ No 24/08/ No 28/09/ Yes 27/10/ Yes 23/11/ No 15/12/ Yes 19

21 Appendix 4: Ambient Monitoring Data. Delvin Waste Water Treatment Works EPA Waste Water Discharge Licence D Schedule B3: Ambient Monitoring Receiving Water Primary Discharge Point ph asw1u E, N asw1d E, N Date asw1u Results asw1d 19/01/ /02/ /03/ /04/ /05/ /06/ /07/ /08/ /09/ /10/ /11/ /12/

22 EPA Waste Water Discharge Licence D Schedule B3: Ambient Monitoring Receiving Water Primary Discharge Point BOD asw1u E, N asw1d E, N Date asw1u Results asw1d 19/01/ /02/ /03/ /04/ /05/ /06/ /07/ /08/ /09/ /10/ /11/ /12/

23 EPA Waste Water Discharge Licence D Schedule B3: Ambient Monitoring Receiving Water Orthophosphate (as P) Primary Discharge Point asw1 u E, N asw1 d E, N Date asw1u Results asw1d 19/01/ /02/ /03/ /04/ /05/ /06/ /07/ /08/ /09/ /10/ /11/ /12/

24 EPA Waste Water Discharge Licence D Schedule B3: Ambient Monitoring Receiving Water Primary Discharge Point Ammonia asw1 u E, N asw1 d E, N Date asw1u Results asw1d 19/01/ /02/ /03/ /06/ /07/ /08/ /04/ /05/ /09/ /10/ /11/ /12/