2017 Annual Performance Report

Transcription

1 2017 Annual Performance Report Thornbury Wastewater Treatment Plant and Associated Collection System Prepared by: Wastewater Operations Staff Reporting Period: January 1 December 31, P age

2 Executive Summary This report has been prepared as required by Amended Environmental Compliance Approval No ZGLNA, Section 10 issued to the Thornbury Wastewater Treatment Plant. Section 10 (6) requires the Owner to prepare and submit a performance report to the Ministry of the Environment and Climate Change (MOECC) Water Supervisor on an annual basis, within ninety (90) days following the end of the period being reported upon. All the requirements listed in Section 10 (6) have been met and will be further explored throughout the report. The Town continues to successfully operate the Thornbury Wastewater Treatment System in accordance with regulatory requirements. Facility Information The Thornbury Wastewater Treatment Plant is a modification of the extended aeration treatment process. The original plant was a lagoon system constructed in In 1993 the plant was expanded to a mechanical facility utilizing the Sutton Concept for sludge disposal. The plant design included provision for phosphorus removal facilities and U.V. disinfection with continued use of existing outfall to the Beaver River on a continuous basis. The Sutton process was developed in the early 1980 s following a research project which involved installing a package treatment facility in line with active lagoons. The system provides nitrification and denitrification for the control of ammonia and hydrogen sulphide in waste stabilization lagoon effluents. A high nitrified effluent is obtained from an extended aeration activated sludge process which provides a high sludge and high solids level in the aeration cells (low F/Mv ratio). The high concentration of nitrates in the secondary effluent, prevents the reduction of sulphates to hydrogen sulphide in the lagoon. The Thornbury Wastewater Treatment Plant is currently rated at 3,580 m³/d operating under Amended Environmental Compliance Approval # ZGLNA. 1.0 Monitoring and Compliance Town Staff ensure that at all times the sewage works and related equipment and appurtenances which are installed or used to achieve compliance are properly operated and maintained. 2 P age

3 2.0 Interpretation of Monitoring Data and Analytical Data A comprehensive interpretation of all monitoring data and analytical data collected during the reporting period, in comparison to the effluent quality and quantity criteria, is outlined below: Capacity Assessment Table No. 1 Year Average Day Flow (m³/d) 2,773 2,335 1,835 2,055 2,540 Average Design Capacity 3,580 3,580 3,580 3,580 3,580 (m³/d) % of capacity (based on 5 64% 65% 51% 57% 71% year rolling average daily flows) Peak Day Flow (m³/d) 7,617 10,580 4,546 7,327 7,448 Peak Design Capacity 7,196 7,196 7,196 7,196 7,196 Raw Sewage Total Flow (m³) 1,010, , , , ,345 Capacity rating is based on Annual Flow Data. 3 P age

4 Chart No. 1: Thornbury WWTP 2017 Monthly Flow Data Thornbury WWTP 2017 Monthly Flow Data (m³/d) Flow m³/d Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Average Daily Flow Average Daily Design Capacity Peak Daily Flow Peak Design Capacity The high flow events in March and April were attributed to the heavy rain fall event experienced. Chart No. 2: Thornbury WWTP Historical Average and Peak Day Flow Flow m³/d Thornbury WWTP Historical Average and Annual Peak Day Flow Annual Average Day Flow Average Daily Design Capacity Annual Peak Day Flow Peak Design Capacity The Annual Peak Day Flow is calculated using the average of the monthly Peak Day Flow events. 4 P age

5 2017 Raw Sewage Loading Objectives (kg/d) Table No. 2 Influent Parameter Design Annual Average Loading % of Design Was Designed Exceeded CBOD % No Total Suspended % No Solids Total % No Phosphorus Total Kjeldahl Nitrogen % No 2017 Effluent Objectives Amended Compliance Approval Number ZGLNA establishes the following effluent limits: Table No. 3 Effluent Parameter Concentration Concentration Was Objective Met? Objective (mg/l) Achieved (mg/l) CBOD Yes Total Suspended Yes Solids Total Phosphorus Yes Ammonia Freezing Yes Ammonia Non Yes Freezing E.Coli (Geometric Mean) Yes ph was maintained at 8.0 which is compliant with the range of 6.5 to 9.0 inclusive, at all times Plant Performance Table No. 4 Effluent Parameter Avg. Daily Effluent Flow 2,967 Annual Average Loading (kg/d) Design Objective (kg/d) Was Design Exceeded? CBOD No Total Suspended Solids No Total Phosphorus No Ammonia Freezing No Ammonia Non-Freezing No 1 Freezing Period November 01 March 31 each year 2 Non-Freezing Period April 01 October 31 each year 5 P age

6 Chart No. 3 Thornbury WWTP Monthly Average Effluent Waste Loadings Thornbury WWTP Monthly Average Effluent Waste Loadings kg/d BOD Design kg/d Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec BOD Objective Chart No. 4 Thornbury Effluent Waste Loadings Suspended Solids Effluent Waste Loadings kg/d Suspended Solids Design kg/d Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec SS Objective P age

7 Table No. 5 Parameter Maximum Month Average Effluent Concentration (mg/l) Achieved Parameter Parameter Limit Non- Limit Freezing Freezing Maximum Month Average Effluent Loading (kg/d) Achieved Parameter Parameter Limit Non- Limit Freezing Freezing Was Effluent Parameter Limit Met? CBOD Yes Suspended Solids Total Phosphorus Ammonia Freezing Ammonia Non- Freezing Yes Yes Yes Yes Effluent Quality Control Measures Effluent quality assurance is controlled by monthly effluent concentrations and waste loading calculations which are submitted to the Owen Sound Office of the Ministry of the Environment and Climate Change (MOECC). As indicated by the effluent concentration and waste loading chart, the Thornbury Wastewater Treatment Plant continues to experience a high degree of removal efficiency, thus this facility was operated within its Certificate of Approval design objective. Table No. 6 Effluent Parameter % Removal Efficiency % Removal Comment (Annual Average) Criteria CBOD 95% Not Applicable High Efficiency Achieved Suspended Solids 95% Not Applicable High Efficiency Achieved Total Phosphorus 82% Not Applicable High Efficiency Achieved Total Ammonia 96% Not Applicable High Efficiency Achieved 4.0 Sampling The influent and effluent samples are taken with an automated composite sampler. The composite samplers are located at the plant head-works and effluent channel after U.V. Bi-weekly, effluent and influent samples are analyzed for CBOD, Suspended Solids, Total Phosphorus and Total Ammonia. SGS Lakefield Laboratory is used for chemical analysis. 7 P age

8 For quality assurance purposes, the Operator will split-sample. This means a sample is collected and split into two portions. One portion is sent to the lab for analyses while one portion is analyzed in-house. The results are compared and the precision of the in-house analysis is evaluated. While the Certificate of Approval requires monthly sampling for raw sewage parameters, operations have increased sampling to bi-weekly for increased risk assessment. 5.0 Maintenance Summary Thornbury Wastewater Treatment Plant New roof and HVAC unit One (1) new Compressor Chart Recorders replaced with a PLC for flow Lethality testing was performed quarterly Hydrogen Sulfide Monitor installed in Inlet Thornbury Wastewater Collection System One (1) pump at Lakeshore rebuilt Eight (8) pumps at four (4) Sewage Lift Station annual service and/or rebuilt 1,600 meters of Collection System flushed and videoed 125 Manholes inspected Pressure transmitter installed in Lakeshore Sewage Pump Station for smoother pump operation New door was installed on Shore Acres Sewage Lift Station Control Panel Sanitary sewer modelling started 6.0 Operating Problems and Corrective Actions This facility was not inspected by MOECC Officials in In September 2017 while work was being completed at the Craigleith Sewage Lift Station, leachate was introduced into the Thornbury WWTP. This process was stopped when the MLSS in the aeration tanks was depleted. The Thornbury WWTP was reseeded from the Craigleith WWTP and the hauling of leachate to the Craigleith SLS was resumed. 7.0 Proposed Alterations, Extensions, and Replacements for 2017 No major modifications and improvements are required during the next reporting period which may require approval under the Ontario Water Resources Act. 8.0 Volume of Sludge generated in 2017 / Anticipated Volumes in 2018 Sludge disposal incorporates the Sutton concept whereas a high sludge age and solids level combined with increased concentration of nitrates in the secondary effluent, prevents the reduction of sulphates to hydrogen sulphide in the lagoon. There were no biosolids removed in The mapping of biosolids accumulation is planned for P age

9 9.0 Sludge Handling Methods and Disposal Areas to be used in 2018 The Sutton process digested sludge will be monitored to determine if the sludge requires removal Summary of Complaints Received in 2017 A record of complaints is maintained. There were recorded odour complaints received for the Thornbury Wastewater Treatment Plant and Collection System. The odour complaints were investigated and the leachate generator was informed that odours must be controlled Summary of all By-pass, Spill or Abnormal Discharge Event There were no by-pass or spill events in Evaluation of Calibration and Maintenance Conducted on Monitoring Equipment The Town is required to install and maintain continuous flow measuring devices to measure the flow rate and quantity of septage added to the Works for co-treatment. The accuracy must fall within plus or minus fifteen percent (± 15%) of the actual flow rate for the entire design range of flow measuring devices. Calibration of the monitoring equipment was completed in 2017 and is attached for reference as Appendix A. All calibration results received met the accuracy requirement Notice of Modifications submitted to the MOECC Water Supervisor as a result of Schedule B, Section 1 There was one Notice of Modification to Sewage Works completed for the replacement of the existing ultraviolet irradiation unit with a Trojan 3000 Plus system including full redundancy. The new unit has been designed for the current design capacity of the treatment plant which is 7,196 m³/day. Two (2) banks will be supplied in one (1) channel with automatic level control. Each bank will contain three (3) modules. Each module will contain eight (8) Lamps. A total of twenty-four (24) lamps are provided per bank. One bank is required to treat the design flow, the other is provided for redundancy. 9 P age

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