Dundalk Wastewater Treatment Plant

Transcription

1 Township of Southgate Dundalk Wastewater Treatment Plant 2017 Annual Report Staff Report PW Dundalk Wastewater Treatment Plant 2017 Annual Report Moved by Councillor Pallister, Seconded by Councillor Frew; Be it resolved that Council receive Staff Report PW for information; and That Council approve the Dundalk Wastewater Treatment Plant 2017 Annual Report. Carried. No Jim Ellis Public Works Manager

2 Dundalk Wastewater Treatment Plant 2017 Annual Report Table of Contents Wastewater Treatment Plant Annual Overview General Wastewater Information. 4 Loading Report.. 5 Performance Report.. 6 Final Effluent Discharge Report 7 Raw Sewage Parameters and Lab Results. 8 Final Effluent Parameters and Lab Results. 9

3 Overview: The Dundalk Wastewater Treatment Plant (WWTP) provided treatment in 2017 with all effluent concentrations limits being met on an annual average. The annual average influent daily flow was 1168 m³/day. Project Description: The Dundalk WWTP is a four cell waste stabilization pond facility flowing into an aeration cell pond with a chemical feed system and a flocculation tank with tertiary treatment consisting of sand filters. Plant Facts: Facilities: Design Capacity: Receiver Water: Environmental Compliance Approval: Effluent Requirements: Sampling Requirements: Waste Stabilization Ponds with Tertiary Treatment 1832 m³/day Foley Drain/Grand River D9LYE CBOD SS DO T.Phos. when temperature >5 C T.Phos. when temperature <5 C Unionized Ammonia mg/l 10 mg/l 10 mg/l 4 mg/l 0.4 mg/l 0.8 mg/l 0.1 mg/l Sampling criteria for this system is in accordance with Ministry policy and the Environmental Compliance Approval (ECA) Final Effluent: A grab sample is taken twice a month and tested for CBOD, Suspended Solids, Total Phosphorus, Total Ammonia Nitrogen, Ecoli, ph and temperature. On site testing is performed twice a week on final effluent for Total Ammonia to determine Unionized Ammonia through lab testing, ph, temperature and Dissolved Oxygen. Raw Sewage: A grab sample is taken monthly and tested for BOD, Suspended Solids, Total Kjeldahl Nitrogen and Total Phosphorus. Effluent Flows: The total effluent flow treated in 2017 was 420,598 m³. The annual average daily flow was 1230 m³/day, which results in a 25.67% increase of total effluent over Raw Sewage Quality: Annual average raw sewage BOD concentration to the lagoon system was mg/l. Annual average raw sewage suspended solids (TSS) concentration to the lagoon system was mg/l. 1

4 Annual average raw total phosphorus was 2.98 mg/l concentration to the lagoon system. Annual average Total Kjeldahl Nitrogen (TKN) concentration was 28.1 mg/l. Plant Performance and Effluent Quality: The Influent annual flow in 2017 has increased 17.94% over 2016 flows. Annual average effluent CBOD concentration was 5.3 mg/l. Annual average effluent total suspended solids (TSS) concentration was 3.4 mg/l day with a removal efficiency of 97.57% with an annual monthly average loading of 5.0 kg/day. Annual average effluent total phosphorus concentration was 0.07 mg/l day with a removal efficiency of 97.13% with an annual monthly average loading of 0.1 kg/day. Annual average effluent concentration for Ammonia-nitrogen was 1.72 mg/l. Annual average Unionized Ammonia was mg/l. Annual average ph was Annual monthly average Ecoli was 34 with the low being 2 and the high being 260. The summary for 2017 of the data for the systems plant operation performance is enclosed in this report. Maintenance and Calibration Activities: Regular monthly preventative maintenance and calibration of test equipment and flow meters are performed by municipal staff and outside certified suppliers. In January m3 effluent discharge flow was added to reflect the average from January 21 to 24, 2017 due to a breaker needing reset. Third party annual calibrations were performed on November 23, There were no by-pass events to report. There were 5 operator shutdowns in 2017: Filter building for effluent shut down on March 20, 2017 due to Un-Ionized ammonia > 0.1 mg/l. Started back up March 21, 2017, Un-Ionized ammonia < 0.1 mg/l. Filter building for effluent shut down on March 30, 2017 due to Un-Ionized ammonia >0.1mg/L. Started back up on March 31, 2017, Un-Ionized ammonia <0.1mg/L. Filter building for effluent shut down April 3, 2017 due to Un-Ionized ammonia > 0.1 mg/l. Started back up on April 4, 2017, Un-Ionized ammonia < 0.1mg/L. Filter building for effluent shut down April 5, 2017 due to Un-Ionized ammonia > 0.1 mg/l. Started back up on April 6, 2017, un-ionized ammonia < 0.1mg/L. Filter building for effluent shut down April 11, 2017 due to Total Suspended Solids >10 mg/l. The plant re-started April 28, 2017, Total Suspended Solids < 10 mg/l. 2

5 Discussion: An environmental assessment was initiated for the Dundalk Sewage Works, to determine methods and expansion to meet future development needs. The Bishop Water Technologies Bio Cord pilot project continued in At the request of Bishop, the reactors were moved from Cell #4 to Cell #2 in August 2017 to identify if Cell #2 provides better analysis and results compared to Cell #4 the winter before. Through the Wastewater Optimization program involving Grand River Conservation Authority and funding from the Ministry of Environment and Climate Change, the Draw the Graph Funding Opportunity was submitted by Southgate to conduct a flow meter verification study for a 4 month period and was accepted. An area-velocity flowmeter (Raven-eye) was installed by ACG Technologies upstream of the Parshall flume on June 7, 2017 to help verify and validate the existing Parshall flume influent flowmeter at the Dundalk lagoons. Some of the conclusions are, both flowrates follow similar trends, the Raven-eye generally shows slightly higher flowrates, for both flowrates peaks occur with precipitation events. The daily average of the Raven-eye flowrates in the analysis period measured 5% higher flows than the Southgate flowrate. A special study was conducted in the summer of 2017 to verify the flow reported by both the Raven-eye flow meter and the Parshall Flume by filling the raw influent wet well in a known period of time. The draw & fill method produced flow rates consistently higher than the Parshall flume. The draw & fill method produces higher flows than the Raven-eye in June and July (based on 10 minute interval data), however those flows are in line with each other when the Raven-eye flows are based on 1 minute interval data. The Parshall flume flows are in line the with the 10 minute interval Raven-eye data in June and July and the Raven-eye flows based on the one minute interval data in August are higher than the reported Parshall flume flows for that period. The Raven-eye flow meter was able to capture peak instantaneous flows to the plant (e.g. captured a high flow event due to rainfall on June 23, 2017, whereas the Parshall flume totalizer did not). The results of these studies would appear that the flume and the Raven-eye are close for average day flow so they may each be over or under estimating in the high and low flow ranges but come out to the same average day flow over the test period. The data collected during this short study, while limited, will be shared with the consultant undertaking the EA. The more frequent flow monitoring may provide some useful information on peak instantaneous and peak hourly flows to the plant, which are important for sizing future infrastructure such as pumps. A continuous influent flow meter can provide useful data such as peak day, peak hourly and instantaneous flows and better technology may be implemented in the future. 3

6 Township of Southgate - Village of Dundalk 2017 General Wastewater Information Plant # : ECA # : D9LYE Population: 1703 (Village of Dundalk) Flows Design Capacity: 208, Influent Average Daily: - m3 1, ,221 1,183 1,164 1,020 1,217 1,482 Annual Influent Flow: 668,600 m3 424, , , , , , , , , ,455 Influent Maximum Daily: - m3 6,362 4,820 2,458 2,873 3,991 3,926 4,453 4,390 4,258 4,577 Effluent Average Daily: 1,832 m3 1,230 1,090 1,181 1,636 1,394 1,136 1,332 1,245 1,466 1,631 Annual Effluent Flow: - m3 420, , , , , , , , , ,173 % Discharge vs. Total Capacity: % 50.1% 58.3% 73.9% 75.7% 55.2% 65.2% 65.0% 80.0% 89.3% Influent Increase 2017 over 2016: % 35.44% % % 86.14% 2.06% 14.33% % % 35.54% Effluent Increase 2017 over 2016: % % % -2.33% 36.99% % 0.30% % % 62.28% 4

7 Township of Southgate Loading Report - Dundalk Wastewater Plant Municipality: Township of Southgate Year: 2017 Plant: Dundalk Wastewater Treatment Lagoons & Collection System Plant # : Works # : System Description : Faculative Lagoons & Sand Filters Loading Influent Effluent Loading Effluent Effluent Effluent BOD SS T Phos. CBOD SS T Phos. Month kg/day kg/day kg/day kg/day kg/day kg/day January February March April May June July August September October November December Total Average Maximum

8 Municipality: Township of Southgate Plant: Dundalk Wastewater Treatment Lagoons & Collection System Year: 2017 Plant # : Receiver: Foley Drain - Grand River Works # : Design Average Day Flow (m3): 1832 System Description : Faculative Lagoons & Sand Filters January % % % February % % % March % % % April % % % May % % % June % % % July % % % August % % % September % % % October % % % November % % % December % % % Average % % % Maximum Township of Southgate Performance Report - Dundalk Wastewater Plant Flows Discharge Bio-Chemical Oxygen Demand Suspended Solids Phosphorus E Coli Temperature Nitrogen Series Loading Raw Effluent Duration Avg. Raw Avg Effluent Percent Avg. Raw Avg. Effluent Percent Avg. Raw Avg. Effluent Percent average < 5 C. TKN Avg. Effluent Unionized Effluent Effluent Effluent Total Flow Avg. Flow Max. Flow Total Flow BOD CBOD Removal SS SS Removal T. Phos T. Phos Removal Effluent or NH3 + NH4 Ammonia CBOD SS T Phos. Month m3 m3 m3 m3 Days mg/l mg/l mg/l mg/l mg/l mg/l Count > 5 C. mg/l mg/l mg/l kg/day kg/day kg/day Total

9 Township of Southgate Annual Report - Dundalk Wastewater Plant Plant: Dundalk Wastewater Treatment Lagoons & Collection System Works: Year: 2017 Location Type: Final Effluent Discharge Report Discharge Total Total Average Average Average Average Average E Coli Average Average Average Duration Effluent Coagulant Coagulant CBOD SS T. Phos. NH3 + NH4 average ph Temp. D.O. Month Days m3 Used (kg) Dosage (mg/l) mg/l mg/l mg/l as N (mg/l) Count Lab Reports C mg/l January February March April May June July August September October November December Total Average Maximum

10 Township of Southgate - Village of Dundalk Annual Report - Dundalk Wastewater Plant Plant: Dundalk Wastewater Treatment Lagoons & Collection System Year: 2017 Works: Population Served: 1703 Classification: Class 1 Wastewater Collection & Class 1 Wastewater Treatment Receiver Foley Drain to Grand River Raw Sewage Parameters January February March April May June July August September October November December Summary Average BOD Minimum mg/l Maximum Suspended Average Solids Minimum mg/l Maximum Average TKN Minimum mg/l Maximum Total Average Phosphorus Minimum mg/l Maximum

11 Plant: Dundalk Wastewater Treatment Lagoons & Collection System Year: 2017 Works: Population Served: 1703 Classification: Class 1 Wastewater Collection & Class 1 Wastewater Treatment Receiver Foley Drain to Grand River Final Effluent Parameters January February March April May June July August September October November December Summary Average CBOD Minimum mg/l Maximum Suspended Average Solids Minimum mg/l Maximum Average NH3 + NH4 Minimum mg/l Maximum Average TKN Minimum mg/l Maximum Total Average Phosphorus Minimum mg/l Maximum Average Ecoli Minimum Maximum Average ph Minimum Maximum Average DO Minimum mg/l Maximum Unionized Average Ammonia Minimum mg/l Maximum Township of Southgate - Village of Dundalk Annual Report - Dundalk Wastewater Plant 9