Operational Certificate: PE # 11652

Transcription

1 Regional District of Central Okanagan Westside Regional Wastewater Treatment Plant 2010 Operational Certificate: PE # 11652

2 Table of Contents Table of Contents... 1 List of Tables and Figures... 2 List of Appendices Purpose Introduction Specific Authorized Discharges and Related Requirements Flow Monitoring and Discharge Rates Effluent Quality, Identified Problems and Events at the WRWTP Raw Influent BOD Loading Raw Influent TKN Loading Raw Influent Total Phosphorus Loading Raw Influent Solids Loading Events - Centrifuge General Requirements Maintenance of Works and Emergency Procedures Bypasses Plans -- New Works Biosolids Management Plan... Error! Bookmark not defined Contingency Plan Peachland Force Main Testing and Pigging Odours Disinfection - Ultraviolet Operations and Maintenance Facility Classification and Operator Certification Water Conservation Sewage Collection System -- Infiltration, Inflow and Cross Connections Influent Waste Bylaw Influent -- Monitoring Requirements Influent -- Sampling Program Influent -- Analyses Effluent -- Monitoring Requirements Effluent -- Sampling Program Monthly Final Effluent Composite Averages Monthly Final Effluent Total Phosphorus and Ortho Phosphate Results

3 7.4 Monthly Final Effluent Total Nitrogen Results Monthly Final Effluent Nitrate/Nitrite and Ammonia Results Sludge -- Monitoring Requirements Sludge Sampling Program Lake Sampling Conclusion List of Tables and Figures Table 1.0 Equivalent Residential Units and Population for Table Maximum Effluent Discharge Rates... 6 Table Yearly Average Flows, Table Average Daily and Monthly Flows for Table Final Effluent Permit Levels and Averages for , 11 Table Yearly Raw Influent Averages from Table Monthly Raw Influent Analysis for Table Monthly Final Effluent Averages and Loadings for Table Permissible Phosphorus Levels Table Cake Metal Analysis for Figure 1 - WRWTP Plant Flow ( )... 9 Figure 2 - WRWTP BOD Loading ( ) Figure 3 - WRWTP TKN Loading ( ) Figure 4 - WRWTP TP Loading ( ) Figure 5 - WRWTP Solids Loading ( ) Figure 6 WRWTP Flow Overview in Figure 7 - Final Effluent Total and Ortho Phosphorus in Figure 8 - Final Effluent Estimated Total Nitrogen in Figure 9 - Final Effluent Ammonia and Nitrate/Nitrite in

4 List of Appendices Appendix A Operational Certificate # Appendix B Westside Regional Sanitary Sewer Service Areas Appendix C WRWTP Lock Out Procedure Appendix D Chlorine Leak Emergency Procedure and Emergency Response Manual Appendix E Emergency Response Plan Flow Chart for Peachland Force Main & Lift Station Appendix F Sewer System Consolidated Bylaw No Appendix G WRWTP Final Effluent and Raw Influent Analyses from CARO Environmental Services Appendix H Metals Concentration Analyses for the WRWTP Bioreactor and Sludge Appendix I Lake Sampling Data 3

5 1.0 Purpose This report is submitted according to the requirement for an annual report as stated in Operational Certificate PE for the Westside Regional Wastewater Treatment Plant. A copy of the permit is provided as Appendix A. 2.0 Introduction The Westside Regional Wastewater Treatment Plant (WRWTP) located in the Municipality of Westside, British Columbia is a Class IV tertiary treatment plant operated by the Regional District of Central Okanagan (RDCO). The WRWTP receives wastewater from the District of West Kelowna, the District of Peachland and Westbank First Nation Reserves #9 and #10. The original plant was commissioned and put into service in 1989 replacing the aerated lagoon facility near the Johnson Bentley Pool. Further service areas include: 2010 Apple Blvd (7 R2 Lots), 1411 Bear Creek Road (4 Lots), Rose Valley Phase 9 Rosealee Lane (17 Lots), Shannon Heights Phase 13 (40 Lots), Paramount Drive (27 Lots) 2009 Tallus Ridge Phase 3, Sarwan Gidda Winery on Boucherie Road, The Heritage (145 units, 173 beds), Shannon Heights Phase 13, Smith Creek Road 5 Lot SD, Jaycor 13 Lot Strata, Rose Valley Phase 9, Bear Creek Road 4 Lots, Appleway/Boucherie 7 Lots, Ranch Road/Country Pines (not completed) Subdivisions of Smith Creek Phase 8, Asquith Road Phase 2, Lakeview Cove Phase 2, Reece/Broadview 5 Lot, Kalamoir Vista (Thacker Drive) No new service areas added Sussex, Montigney Lakeview Phase 3, Glenrosa Stage 1(near completion), Lakeview Phase Casa Loma, Sunnyside, West Kelowna Estate, Peachland Subdivisions of Huntsfield Green Strata, Rose Valley 5, Westside Country Club, Sundance Drive Extension, Mt Boucherie, & Crystal Hills 5. Casa Loma collection system, Logan Road/Evelyn Court & Orlin Road. Vintage Hills phase 1, Elk Road and Shannon Lake Mobile Home Park on Indian Reserve # Expansion of existing services in West Kelowna Estates, Morningside, Rose Valley and Westview Plateau. Expansion of Trunk to Westside Landfill. New services to Sunset Ranch, Olympus Way and several areas in the Mt. Boucherie Developments Expansion of existing services including West Kelowna. New service to Sunnyside Expansion of Glenrosa trunk (Webber Rd), Lakeview Heights and West Kelowna. New services for Whitworth Rd and Hitchner/ Jenners Rd residents Expansion of existing services and of Lakeview trunk into Lakeview Heights and East Boundary trunk into West Kelowna Estates and a new lift station, Horizon Village, that services the new subdivision in West Kelowna Estates. Appendix B depicts the areas currently serviced by the Westside Regional Sanitary Sewer System. 4

6 The following table displays the number of connections and the corresponding flows to the WRWTP. Table 1.0 Equivalent Residential Units and Population for West Kelowna Peachland WFN Total Residential Units 9,731 1,240 2,777 13,748 Farm Units Commercial Units ,053 Metered Units Institutional Units Total Units 10,978 1,391 3,026 15,395 Jurisdictional Population 27,195 5,172 8,647 41,014 Population per Unit Combined with West Kelowna 9,578 Average Daily Flow (m3/day) 8, Population per Unit based on AECOM projections (WRWTP Stage 3 Design) and BC Statistics The Westside Regional Wastewater Treatment Plant operates the Westside Process that uses biological nutrient removal (BNR) in sequential anaerobic, anoxic, and aerobic zones. The three-stage activated sludge process removes both nitrogen and phosphorus from the wastewater and achieves a high carbonaceous BOD removal. Aluminum sulphate is used for supplemental phosphorus removal. This, along with clarifiers, Aqua Cloth Media filters and an ultraviolet disinfection system reduce the pathogens, solids and nutrients that discharge into Okanagan Lake. 3.0 Specific Authorized Discharges and Related Requirements The WRWTP has a deep lake outfall for the reclaimed wastewater located approximately 275m from shore and 60m beneath the surface of Okanagan Lake. The site reference number for this discharge is Environmental Monitoring System (EMS) E The WRWTP discharges effluent to the lake under provisions of Operational Certificate PE #11652, issued August 1992, by the Ministry of Water Land & Air Protection (MWLAP). The Operational Certificate, amended June 1998, outlines permissible levels, new discharge requirements, the incorporation of Peachland and expected flow increases in the following years. This annual report will address each section of the current Operational Certificate. Please note that the WRWTP has applied to the MOE (Ministry of Environment) for an amendment to the current Operational Certificate PE #1165 in the last quarter of Resulting changes from the Amended Permit will be noted and discussed in the

7 3.1 Flow Monitoring and Discharge Rates Ultrasonic flow meters are in place at the influent channel located before the headworks building and in the final effluent channel. The Operational Certificate sets forth yearly maximum effluent discharge rates from the sewage treatment plant as shown in Table 2.0. The WRWTP has not exceeded discharge rates in Table Maximum Effluent Discharge Rates Maximum Daily Flow in 3 m Maximum Monthly Flow in 3 m Maximum Yearly Flow in 3 m up to ,800 85,167 1,022, , ,667 1,460, , ,083 1,825, , ,500 2,190, , ,200 3,074, , ,167 3,650, , ,792 4,197, , ,417 4,745, , ,500 5,490, , ,292 6,387, , ,333 7,300, , ,333 7,300, , ,333 7,300, , ,333 7,300, , ,333 7,300,000 6

8 Table 3.0 chronicles flows from It should be noted that the plant flow totalizer was not in place until October Plant flow data up to that time was collected using a slightly less reliable method. In August 2003, it was discovered that the effluent v-notch weir had significant warping and was not reliable for flow measurement. A calibrated strap-on flow meter was installed and indicated the actual plant flow was nearly 1.7 times higher than the v-notch weir was recording. All flows for 2003 have been recalculated to show the corrected values. In September 2007 it was determined that the Effluent Ultrasonic Flow Meter was not zeroed at the time of installation (2005) and was reading 30L/s high. The WRWTP has not exceeded the maximum discharge rates during the years Table Yearly Average Flows, Average Daily Flow Average Monthly (m 3 3 /day) Flow (m /month) Total Flow (m 3 /year) , , , , ,224 37, , ,436 43, , ,644 50, , ,186 62, , ,600 79, , ,937 89,331 1,071, ,863 87,179 1,046, , ,146 1,441, , ,962 1,487, , ,128 1,537, , ,761 1,689, , ,964 2,879, , ,739 2,708, , ,236 3,143, , ,236 4,144, , ,150 3,853, , ,496 3,605, , ,445 3,533, , ,319 3,495,828 7

9 Table 4.0 shows the average effluent flows from the WRWTP for the year Table Average Daily and Monthly Flows for Average Daily Flow (m 3 /day) Total Monthly Flow 3 (m /month) Jan 9, ,040 Feb 9, ,955 Mar 9, ,336 Apr 9, ,375 May 9, ,289 Jun 10, ,200 Jul 10, ,683 Aug 10, ,201 Sep 10, ,764 Oct 9, ,755 Nov 9, ,086 Dec 9, ,144 Over the past several years the population connected to the sewer system has continued to increase. The average daily flow into the WRWTP during 2010 was approximately 9.6 ML/d. The operation flow capacity for the plant is 11.2 ML/day -the current design flow is 14.0 ML/day, 2.8 ML/day of which would only be available during an emergency situation. 8

10 The following graph illustrates the daily flow since The sudden jump in 2003 was due to changing from the weir to the flow meter. The general trends observed from this graph are: Average Dry Weather Flow capacity of 5.6 ML/d and 7.0 ML/d as of July 2005 (as indicated by the solid line) was exceeded frequently in the past. Minimum daily flows over the winter increases each year Maximum daily flows increase with each year, with 2004 (Sept. 1, ,686 m3/day and Mar. 30, ,912 m3/day) and 2006 (discovery of the flow meter zeroing issue in Sept.) being the exception. Low daily flows noted from May 26-30, 2005, (5997, 5768, 5454, 5832 and 5997 m 3 /day respectively) due to implementation of new Filtration System. Record high flow August 14, 2009 major rainstorm event (14,702m3/day) 9

11 3.2 Effluent Quality, Table 5.0 compares plant effluent data from with corresponding permissible levels and related figures. From , the concentrations for total nitrogen, total phosphorus, BOD, total suspended solids (TSS), fecal coliforms and total chlorine residuals were all under permissible levels. Since that time the total phosphorus permit levels have been exceeded until For 2010, the yearly average of total nitrogen is over the respective permissible levels set in the Operational Certificate, while all other parameters fall under the guidelines. Although the plant is running well and meets permit guidelines day by day, there are still several problems that have occurred over the past year to account for variations in the process. Section 4.0 describes some of the current problems experienced at the WRWTP. The following table depicts the permissible levels and the various parameters analyzed from Table Final Effluent Permit Levels and Averages for Parameter Permit Level Total Nitrogen (mg/l) Total Kjeldahl Nitrogen (mg/l) Organic Nitrogen (mg/l) Nitrate/Nitrite (mg/l) Ammonia (mg/l) Total Phosphorus (mg/l) Ortho Phosphate (mg/l) Dissolved Phosphorus (mg/l) C-BOD (mg/l) 10.0 < 5.0 < 5.0 < 5.0 < 5.0 <5.0 < COD (mg/l) Total Suspended Solids (mg/l) Total Chlorine Residual (mg/l) PH Temperature ('C) Total Coliforms (CFU/100ml) Fecal Coliforms (CFU/100ml)

12 Table 5.0 (continued) - Final Effluent Permit Levels and Averages for Parameter Permit Level Total Nitrogen (mg/l) Total Kjeldahl Nitrogen (mg/l) Organic Nitrogen (mg/l) Nitrate/Nitrite (mg/l) Ammonia (mg/l) Total Phosphorus (mg/l) Ortho Phosphate (mg/l) Dissolved Phosphorus (mg/l) C-BOD (mg/l) 10.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 COD (mg/l) Total Suspended Solids (mg/l) Total Chlorine Residual (mg/l) PH Temperature ('C) Total Coliforms (CFU/100ml) Fecal Coliforms (CFU/100ml)

13 4.0 Identified Problems and Events at the WRWTP The following sections illustrate the loading problems in the plant for BOD, solids, and nutrients from the raw wastewater as well as discuss any specific events and their impact on plant performance. 4.1 Raw Influent BOD Loading The BOD loading in the raw wastewater for the Westside treatment plant was initially designed at 1120 kg/d and increased to 2800 kg/d with the completion of the Stage 2 Upgrades in the summer of These BOD capacities have been increasingly exceeded over the past few years, but as seen in the graph below are now beginning to fall below the design capacity. The following graph illustrates the raw BOD loadings from 1999 to As illustrated in Figure 2, during the year of 2010, plant BOD loadings exceeded the designed value 17% of the time. 12

14 4.2 Raw Influent TKN Loading The TKN loading has been increasing steadily over the past few years. The plant s initial design capacity was 210 kg/d, but is now increased to 526 kg/d with the implementation of the two new Bioreactors in the summer of The following graph shows the TKN loading over the past 10 years with the black line on the graph indicating the design TKN loading. In 2010, 50% of the samples taken were above the design limit for TKN loading. Since 2002, 89% of the TKN loadings have exceeded design capacity in the raw wastewater samples. 13

15 4.3 Raw Influent Total Phosphorus Loading Since the year 2000, the total phosphorus loadings in the raw wastewater have gradually exceeded initial design capacity (42 kg/d), increasing from 28% to 100% over permit levels for all samples until 2007 (completion of stage 2 upgrades and increased design capacity of 106 kg/d). In 2010, all of the total phosphorus loadings fell under the current design capacity. 14

16 4.4 Raw Influent Solids Loading The initial design solids loading for the plant was 1260 kg/d and increased to 3150 kg/d at the end of From , the percentage of samples over design capacity was 94%. After the Stage 2 expansion in 2007, the percentage dropped to 56% for 2007, 35% for 2008 and 29% for In 2010, only 30% were above the design capacity. The following graph illustrates the raw influent solids loading since 1999, with the red segmented line indicating the trend. 15

17 4.5 Events - Centrifuge The centrifuge continues to be operated to its maximum capacity and has had some mechanical failures attributed to wear as well as overuse. Because the plant currently has no redundancy on this equipment mechanical failure is a major process interruption no biosolids can be produced and waste sludge must be stored until the unit is repaired and operational. The Centrifuge had two major shutdowns in 2010, one in August and the other in October. In each instance waste sludge was stored on-site for several days until the system was operational. The stage 3 upgrades; which are anticipated to be complete by the end of 2011, will include a new larger capacity centrifuge which will give the plant much needed backup/redundancy for Biosolids production. 16

18 5.0 General Requirements 5.1 Maintenance of Works and Emergency Procedures Inspections of all components of the collection system, such as manholes and sewer mains are completed annually. Flushing and repairs are performed as required. A daily check procedure is in place for the operators at the treatment plant. Checks and maintenance on equipment are completed on a daily basis. In addition, flows, levels and volumes are recorded. In place at the treatment plant is the WRWTP Lock Out Procedure, used when operators work on any pumps or electrical equipment (Appendix C). A maintenance program is also in effect at the treatment plant. The database prints out a report that directs the operators to perform maintenance of specific pieces of equipment. Every piece of equipment at the plant and lift stations is listed in the database. This ensures that all equipment is serviced regularly. Complete manufacturer manuals and literature for all equipment is readily accessible at the treatment plant. Material Safety Data Sheets (MSDS) are on file at the treatment plant and updated when required. The majority of chemicals are in the lab, which is equipped with a fire blanket, burn station, eyewash station and two chemical fire extinguishers. Chemicals and other hazardous materials that are located on site have a MSDS summary sheet posted nearby detailing effects and safety precautions. Although the wastewater plant does not use chlorine gas to disinfect, 68-kg (150 lb.) chlorine cylinders are stored on plant grounds for the water distribution stations. A spill procedure for chlorine leak emergencies (Appendix D) is in place. The local fire departments also have a diagram of the plant site locating the cylinders if there is a leak. 5.2 Bypasses There were no bypasses of the treatment works during Plans -- New Works The Regional Board awarded a contract to expand the Westside Regional Wastewater Treatment Plant - construction of the Stage 3 upgrades began at the end of 2010 by Greyback Construction. Included in the Stage 3 upgrades are: two fine screens in the new Head Works Building, refurbishing of the original decommissioned Fermenter, two Bioreactors and Centrifugal Blower upgrades, Odor control as required, two Secondary Clarifiers, installation of two additional Cloth disk filters, UV disinfection upgrades, installation of an additional Centrifuge, Conveyor system, Bin upgrades, miscellaneous piping and electrical/instrumentation upgrades as required. These additions will help with increasing population/flows in the area as well as offer the plant some redundancy on existing processes. An Overview of the Plant s current Flow Details is shown in Figure 6. 17

19 18

20 5.4 Biosolids Management Plan Currently the cake/biosolids are deposited into a 17 cubic yard bin - when full, a hauling company trucks the biosolids off-site to a RDCO land application site. In October 2010, the Regional Board authorized a short-term 2 year plan for managing biosolids produced at the plant. A Land Application Permit process has been completed by SYLVIS, a leading Canadian environmental consulting firm. The company proposed the beneficial application and use of the Environment regulated process for several Crown Land areas. Previously; from January to October, the biosolids were trucked to the City of Kelowna Landfill. In 2010 the plant generated approximately 4500 tonnes of biosolids material. 5.5 Contingency Plan The RDCO Water and Wastewater Divisions have implemented an Emergency Response Manual, which is updated regularly and sent to the MOE as required. The manual provides guidelines and a sufficient level of detail to address the appropriate course of action for many preconceived emergencies. The contingency plan includes spill procedures, first response, notification, and environmental regulations for the collection, treatment and disposal systems for the water and wastewater utilities. Also included in the Emergency Response Manual is detailed protocol for the Peachland force main that runs along the bottom of Okanagan Lake. A leak response plan as well as well as an emergency response flow chart and emergency storage schematic (Appendix E) are readily available to system operators and others needing information should a problem occur. 5.6 Peachland Force Main Testing and Pigging Flow meters are located at either end of the force main. If there is a difference between the two meters, an alarm sounds at the treatment plant warning the operators of the flow change thus indicating a possible leak. The Peachland Emergency capacity is one day storage minimum, based on current flows. Pressure testing of the force main is completed at least once a year by RDCO staff. In 2010, no leaks were detected. 19

21 5.7 Odours An Odour Control Monitoring Program was established in 2009 and continues to be operational at the plant as well as throughout the Collection System. Hydrogen Sulphide Data Loggers are used weekly within the collection system to monitor odour characteristics. These characteristics are trended and permanent/seasonal chemical dosing facilities are used to combat and control odours as required. A permanent Hydrogen Sulphide Monitor has also been installed in 2010 and is located near the entrance of the WRWTP in the vicinity of Biofilter 2. It is trended on the SCADA system, calibrated quarterly and monitored daily. 5.8 Disinfection Ultraviolet Ultraviolet (UV) radiation is effective in the disinfection of effluent wastewater. Water from the Aqua Clothe Membrane filters passes through a channel where two banks of UV lights are immersed. Each bank contains eight racks. Each rack is composed of eight quartz UV lamps attached in a horizontal fashion. The UV assembly expands across the entire width of the channel. To ensure proper UV penetration throughout, water flows within one inch of the lamps. The UV lamps emit a 254-nanometer (nm) wavelength at a high intensity level. Genetic material absorbs wavelengths between nm. As the light penetrates an organism it denatures its DNA helix and modifies bonds within the cell. The cell cannot reproduce and dies within 1 minute to 2 hours after exposure. The Operational Certificate permissible level for fecal coliform is 50 CFU/100 ml. In 2010, the annual average was 31 CFU/100 ml. Increased fecal coliform levels were noted in a September sampling event possibility of a Lab or sampling error. Re-sampling did not show repeated high numbers; however, the initial elevated sample results are included in the annual average. 5.9 Operations and Maintenance Operational and Maintenance Manuals for the sewage collection system, sewage treatment, effluent utilization and disposal are accessible at the treatment plant. Also new in The District of West Kelowna assumed the operation and maintenance of the local sewage collection system within West Kelowna boundaries on May 15, 2010 from the RDCO. 20

22 5.10 Facility Classification The British Columbia Environmental Operators Certification Program classes the Westside Regional Wastewater Treatment Plant as a Level IV facility. Mike Wyman, Senior Treatment Plant Operator holds a valid Level 1V EOCP Certificate Water Conservation The Regional District continues to advise and educate the public and business sectors regarding water conservation within the valley. Our mandate is to encourage a reduction in the volume of domestic, industrial, and commercial wastewater discharged to the sewage collection system Sewage Collection System -- Infiltration, Inflow and Cross Connections As of 2010, there was no evidence of infiltration in the sewer system or excess inflow from users. There were no cross connections discovered or reported during the year Influent Waste Bylaw Sewer System Consolidated Bylaw No regulates the operation and use of the sanitary sewer systems within the boundaries of the RDCO. This bylaw deals with the following sections: connection requirements service connection standards building sewer construction standards interference with the sewer system septic tanks prohibited wastes standards for restricted wastes accidental discharges requirements for pre-treatment special control manholes wastewater monitoring control of waste disposal provisions for sewer disconnection recovery of costs for damage to the system offenses and penalties 21

23 A copy of this bylaw is attached as Appendix F. 6.0 Influent -- Monitoring Requirements 6.1 Influent -- Sampling Program Grab samples are taken in the raw influent channel a minimum of three times per week. Samples are taken at approximately the same time of day during peak flow and compared, in-house, with previous results. Once a month an independent accredited laboratory, CARO Analytical Services, analyses a raw influent Composite sample for nutrient concentrations. In addition, once a year the raw influent is tested for total metal concentrations by CARO Analytical Services. The raw influent results are provided in Appendix G. 6.2 Influent -- Analyses Table 6.0 summarizes the yearly raw influent parameters since Table Yearly Raw Influent Averages from Parameter Total Nitrogen(mg/L as N) Total Kjeldahl Nitrogen (mg/l) Nitrate/Nitrite (mg/l as N) Ammonia (mg/l as N) Total Phosphorus (mg/l as P) Ortho Phosphate (mg/l as P) PH BOD (mg/l) COD (mg/l) Total Suspended Solids (mg/l)

24 Table 7.0 shows the monthly averages for 2010 for each of the parameters analyzed in the raw influent Table Monthly Raw Influent Analysis for Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Avg. Est. Total Nitrogen (mg/l) Total Kjeldahl Nitrogen (mg/l) Organic Nitrogen (mg/l) Nitrate/Nitrite (mg/l) Ammonia (mg/l) Total Phosphorus (mg/l) Ortho Phosphate (mg/l) ph T-BOD (mg/l) COD (mg/l) Total Suspended Solids (mg/l)

25 7.0 Effluent -- Monitoring Requirements 7.1 Effluent -- Sampling Program Sampling takes place throughout the plant routinely three times a week or more, depending on plant performance. Due to ever increasing demands for data and lab efficiency, a new autoanalyzer was purchased and has been in operation since In addition, a Water Quality Student has also been assisting seasonally in the lab to help with daily duties as required. The lab also incorporates a quality control program which is checked daily against known standards. The IDEXX system continues to be a useful addition to the lab for Bacterial analysis. This allows the lab to monitor the Fecal coliforms leaving the plant which not only shows the efficiency of the UV system, but it is also used as a screening procedure. Additionally, all samples are still sent to an outside Laboratory for confirmation. A HACH DR/5000 was purchased in 2010 and is routinely used to measure total phosphorus and COD. Other tests, such as orthophosphate, ammonia, volatile fatty acids, color, turbidity, copper, manganese and iron can be performed as required. The wastewater lab also is equipped to do total and suspended solid testing, volatile solids, ph, settling tests, and sludge volume index. All analysis carried out in the lab follows Standard Methods for the Examination of Water and Wastewater, 21 th Edition. An outfall composite sample is collected from a refrigerated automatic sampler on a daily basis. The sampler is programmed to collect approximately 100 ml every 20 minutes. An influent refrigerated composite sampler was also added in 2009 the sampler is programmed to collect 100 ml of sample every 2 hours. CARO Analytical Services is an accredited independent laboratory located in Kelowna. Samples from the WRWTP are sent to CARO Analytical Services on a monthly basis and analyzed for the following: BOD Total Kjeldahl Nitrogen Ammonia Nitrate/Nitrite Total Phosphorus Orthophosphate VFA Total Suspended Solids Total and Fecal Coliform These results aid in maintaining an appropriate level of quality assurance and quality control within the RDCO lab. The final effluent results are provided in Appendix G. 24

26 The WRWTP has continued to assume more responsibility for sample analysis with the implementation of a ChemScan on-line Analyzer in It is situated in the Effluent Filter Building and monitors Phosphorus, Ammonia, Nitrate and Transmissivity 24 hrs/day. The Aluminum Sulphate System has been automated with Phosphorus data from the Chemscan allowing automatic delivery of Alum to the Effluent when the Phosphorus concentration is over permit. 7.2 Monthly Final Effluent Composite Averages Table 8.0 shows monthly final effluent composite averages and loadings. Nutrient values are represented in separate tables with graphs in following sub-sections. Table Monthly Final Effluent Averages and Loadings for Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Avg Est. Total Nitrogen (mg/l) Total Kjeldhal Nitrogen (mg/l) Organic Nitrogen (mg/l) Nitrate/Nitrite (mg/l) Ammonia (mg/l) Total Phosphorus (mg/l) Ortho Phosphate (mg/l) C-BOD (mg/l) <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 COD (mg/l) Total Suspended Solids (mg/l) Total Chlorine Residual (mg/l) ph Temperature ('C) Total Coliforms (CFU/100mL) Fecal Coliforms (CFU/100mL)

27 7.3 Monthly Final Effluent Total Phosphorus and Ortho Phosphate Results The Operational Certificate established for the WRWTP states, The Total Phosphorus level to strive for is the lake background level. The percentile values (shown below) relate to the daily values. For example, 99 percentile means that 99 percent of all daily values throughout the year are not to exceed 1.5 mg/l total phosphorus as P. The following table lists the phosphorus levels established in the Operational Certificate and the following figure illustrates the total and orthophosphorus averages for Table Permissible Phosphorus Levels Total Phosphorus as P Mg/L Not to exceed percentile percentile Annual Average 0.25 Level to Strive for

28 The following figure illustrates monthly total phosphorus and ortho phosphate levels in the final effluent composite samples. With the additional capacity added in the Stage 2 Upgrades coupled with the automation of Aluminum Sulphate, the WRWTP was able to keep the monthly permissible levels for total phosphorus below the permit level for In 2010, the WRWTP annual average total phosphorus was 0.18 mg/l. The total phosphorus discharged into Okanagan Lake for 2010 was estimated at 638 kg. Approximately 244 kg was in the orthophosphorus form. 27

29 7.4 Monthly Final Effluent Total Nitrogen Results The following figure illustrates the estimated total nitrogen for the WRWTP in The total nitrogen is determined by adding the average organic nitrogen value with the nitrate/nitrite and ammonia values. The WRWTP contributed 24,326 kg of total nitrogen to Okanagan Lake in The WRWTP has exceeded monthly permissible levels 10 times during These exceedences contributed an additional 2948 kg of nitrogen to Okanagan Lake above the permitted discharge levels. The excess nitrogen discharged into the lake was mainly a result of loadings above the design capacity from the raw influent as discussed in Section

30 7.5 Monthly Final Effluent Nitrate/Nitrite and Ammonia Results The following figure depicts the ammonia and nitrate/nitrate concentrations measured in the final effluent outfall for In 2010, 17,726 kg of nitrate/nitrite nitrogen and 1,843 kg of ammonia nitrogen were discharged into Okanagan Lake from the WRWTP. 29

31 8.0 Sludge -- Monitoring Requirements 8.1 Sludge Sampling Program There are two types of sludge produced by the treatment plant process: primary sludge from the fermenter and waste activated sludge from the dissolved air floatation tanks (DAFT). The sludge in the fermentation tank comes from the primary clarifier. In the fermenter, the sludge breaks down through a process known as acid fermentation and a supernatant rich in volatile fatty acids (VFAs) is produced. While producing VFAs, the sludge thickens by settling to the bottom of the tank. The settled sludge is then pumped to the centrifuge to be dewatered. The average solids content of fermenter sludge in 2010 was 4.5%. Waste activated sludge is pumped from the end of the bioreactor into the DAFT where it is thickened before being discharged into the sludge vault. The average solids content of DAFT sludge in 2010 was 4.3 %. Both fermenter sludge and DAFT sludge are analyzed every six months for total metals and TKN. Analyses are done by CARO Analytical Services, an independently accredited laboratory. The fermenter and DAF sludge results are provided in Appendix H. The cake (Biosolids) produced by the centrifuge are trucked offsite to a RDCO Land Application site daily and each month a sample is sent for complete metal testing to CARO Analytical Services. These results are also provided in Appendix H. 30

32 The following table summarizes some of the metal concentrations for the cake over Table Cake Metal Analysis for 2010 Yearly Jan 10-Feb 25-Mar 19-Apr 19-May 10-Jun 21-Jul 12-Aug 09-Sep 07-Oct 17-Nov 07-Dec Average Parameter Aluminum 7,700 12,000 11,000 7,600 7,600 12,000 6,400 7,400 8,300 3,900 5,800 8,400 8,175 Arsenic Cadmium Calcium 6,900 7,300 7,200 7,300 7,300 8,100 6,100 5,100 9,100 6,600 6,400 8,000 7,117 Chromium Cobalt Copper Iron 2,100 2,100 1,900 1,900 2,200 2,300 1,900 1,300 2,200 2,000 1,800 2,000 1,975 Lead Manganese Mercury Molybdenum Nickel Silver Sodium Zinc Moisture (%) 76% 76% 79% 78% 74% 79% 78% 81% 80% 81% 82% 81% 79% Solids (%) 24% 24% 21% 22% 26% 21% 22% 19% 20% 19% 19% 19% 21% Volatile Solids (%) 80% 85% 85% 86% 87% 84% 85% 82% 83% 81% 85% 84% 84% TKN (%) 6.0% 5.8% 6.8% 6.6% 5.6% 7.0% 6.5% 7.0% 7.7% 7.4% 8.8% 8.3% 7.0% 31

33 9.0 Lake Sampling Golder Associates were contracted in May and October 2010 to collect lake samples for analysis. CARO Analytical Services completed the tests. The results of the two sampling events are provided in Appendix I. This contract will be replaced in 2011 with a Collaborative Monitoring Agreement. A Memorandum of Understanding has been signed between the MOE, the City of Kelowna, the District of Summerland and the RDCO. An overview of this new Monitoring Agreement will be discussed in the 2011 Annual Report. ` 10.0 Conclusion On average, the WRWTP removed 98% of the total phosphorus entering the plant and discharged 638 kg of total phosphorus to Okanagan Lake in In addition; Total nitrogen was reduced by 86%, with a BOD and solids reduction of more than 99%. With the Stage 3 Upgrades under construction; the WRWTP will be able to cope with the accelerating population in the service area, continuing to preserve the quality of Okanagan Lake and provide West Kelowna, Peachland and Westbank First Nation with ongoing quality service. 32