Stonecrest Estates Sewage Treatment Plant 2017 Annual Report · 2018. 4. 9. · Stonecrest Estates Sewage Treatment Plant Annual Report 3 Executive Summary . The Stonecrest Estates

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2017

The Corporation of the City of

Quinte West

Public Works and Environmental Services

Stonecrest Estates Sewage Treatment Plant 2017 Annual Report

The Corporation of the City of Quinte West Public Works and Environmental Services

Water/Wastewater Division Stonecrest Estates Sewage Treatment Plant Annual Report

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Contents Table of Figures ............................................................................................................................... 1

Executive Summary ......................................................................................................................... 3

Summary and Interpretation of Monitoring Data .......................................................................... 5

Summary of Bypass, Spill, and abnormal discharge Events.......................................................... 10

Analysis of Final Effluent Monitoring Data ................................................................................... 11

Carbonaceous Biochemical Oxygen Demand (CBOD) / Biochemical Oxygen Demand (BOD) .. 11

Total Suspended Solids (TSS) ..................................................................................................... 13

Total Phosphorus (TP) ............................................................................................................... 15

Ammonia (NH3) / Ammonium (NH4+) ....................................................................................... 17

Geometric Mean Density of E. Coli ............................................................................................ 18

Final Effluent pH ........................................................................................................................ 19

Summary and Interpretation of Final Effluent criteria associated with Micro C addition. .......... 20

Summary of Operating Problems throughout Reporting Period.................................................. 21

Summary of Maintenance performed throughout Reporting Period .......................................... 21

Summary of Biosolids Generated in 2017 .................................................................................... 21

Summary of Effluent Quality Assurance and Control Measures .................................................. 22

Summary of Calibration and Maintenance carried out on Final Effluent Monitoring Equipment22

Summary of Complaints received throughout the Reporting Period ........................................... 24

Closing Remarks ............................................................................................................................ 24

Table of Figures

Table 1 - Summary of Monthly & Annual Average Final Effluent Concentrations ......................... 5 Table 2 – Micro C BOD Augmentation Effluent Result Summary ................................................... 6 Table 3 - Monthly & Annual Average Final Effluent Waste Loading Summary .............................. 7 Table 4 - Summary of Raw Sewage Monthly Average Concentrations .......................................... 8 Table 5 - Plant Flow Monitoring Summary ..................................................................................... 9 Table 6 - Summary of Bypass, Spill, and abnormal discharge Events ........................................... 10



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Figure 1 - Monthly Average CBOD Concentration vs. Limit & Objective ...................................... 11 Figure 2 - Monthly Average CBOD Waste Loading vs. Effluent Limit ........................................... 12 Figure 3 - Raw Sewage Concentrations vs. Effluent Concentrations ............................................ 12 Figure 4 - Final Effluent Monthly Average TSS Concentration vs. Limit & Objective ................... 13 Figure 5 - Final Effluent TSS Waste Loading vs. Effluent Limit ...................................................... 14 Figure 6 - Raw Sewage TSS Concentration vs. Final Effluent Concentration ................................ 14 Figure 7 - Monthly Average Effluent TP Concentration vs. Limit & Objective ............................. 15 Figure 8 – Final Effluent TP Waste Loading vs. Effluent Limit ...................................................... 16 Figure 9 - Raw Sewage TP Concentration vs. Effluent TP Concentration ..................................... 16 Figure 10 - Effluent Monthly Average TAN Concentration vs. Limit & Objective......................... 17 Figure 11 - Final Effluent TAN Waste Loadings vs. Effluent Limit ................................................. 18 Figure 12 - Final Effluent Geometric Mean Density of E.Coli vs. Limit & Objective ..................... 19 Figure 13 - Final Effluent pH values vs. Upper/Lower Limits ........................................................ 19 Figure 14 - Annual Flow meter calibration report. ....................................................................... 23



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Executive Summary

The Stonecrest Estates Sewage Treatment Plant (STP), MOE Identifier number 120003762, is located at 51 Aikins Road in Bayside. The facility operates in accordance with ECA number 4460-AHBRVY issued on January 13, 2017, and previously in accordance with ECA number 0776-9U3R7P, issued on March 25, 2015. The City applied for an ECA amendment to update the Works descriptions, and to introduce a BOD augmentation chemical, trade name Micro C 2000, during the timeframe the residential area was being built up.

The WWTP is a Class II Treatment Plant, and is currently rated to treat 213 m3/d. The facility is described as a Membrane Treatment facility. The process is described as having one (1) Equalization (EQ) Tank receiving wastewater from the Stonecrest Estates subdivision, and the Bayside Secondary School. Raw sewage from the EQ tank is pumped through a fine-screen, before it is discharged into one (1) Anoxic Tank equipped with two (2) submersible pumps and one (1) mixer. Mixed Liquor from the Anoxic tank is then pumped into one (1) Aeration tank equipped with fine bubble aeration. Before Mixed Liquor is gravity-fed into the Membrane holding tank, it is dosed with Aluminum Sulphate for Phosphorus control, and Caustic Soda for pH control. A set of two (2) Permeate extraction pumps operate in a Duty/Standby configuration and place a vacuum on the membrane modules. This pulls clear liquid through the membranes, while leaving sludge and organisms behind in the membrane tank in order to increase the biological process. Final Effluent receives a UV irradiation dosage for disinfection, before final discharge into the Bay of Quinte.

In accordance with ECA number 4460-AHBRVY an annual report shall be prepared within 90 days following the end of the calendar year being reported upon, detailing the following:

a. A summary and interpretation of all monitoring data and a comparison to the effluent limits outlined in Condition 8, including an overview of the success and adequacy of the Works; (see pages 5 – 20);

b. A description of any operating problems encountered and corrective actions taken; (see page 21)

c. A summary of all maintenance carried out on any major structure, equipment, apparatus, mechanism or thing forming part of the Works;(see page 21)



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d. A summary of any effluent quality assurance or control measures undertaken in the reporting period;(see page 22)

e. A summary of the calibration and maintenance carried out on all effluent monitoring equipment; (see page 22) and,

f. A description of efforts made and results achieved in meeting the Effluent Objectives of Condition 7. (see pages 5 – 20)

g. A tabulation of the volume of sludge generated in the reporting period and an outline of anticipated volumes to be generated in the next reporting period and a summary of the locations to where the sludge was disposed; (see page 21);

h. A summary of any complaints received during the reporting period and any steps taken to address the complaints;(see page 24);

i. A summary of all by-pass, spill or abnormal discharge events; (see page 10);

j. A copy of all Notice of Modifications submitted to the Water Supervisor as a result of Schedule B, Section 1, with a status report on the implementation of each modification; (Not applicable);

k. A report summarizing all modifications completed as a result of Schedule B, Section 3; (Not applicable); and,

l. Any other information the Water Supervisor requires from time to time.



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Summary and Interpretation of Monitoring Data

Summary of Final Effluent Monthly Average & Annual Average Concentrations

Month

CBOD Monthly Average Concentration (mg/L) Objective: 5.0 mg/L

TSS Monthly Average Concentration (mg/L) Objective: 5.0 mg/L

TP Monthly Average Concentration (mg/L) Objective: 0.1 mg/L

TAN Monthly Average Concentration (mg/L) Objective: 2.0 mg/L

Geometric Mean Density of E.Coli (cfu/100mL) Objective: 150 cfu/100mL

pH

Limit: 10.0 mg/L Limit: 10.0 mg/L Limit: 0.2 mg/L Limit: 3.0 mg/L Limit: 200 cfu/100mL

MIN Limit: 6.0

MAX Limit: 9.5

January 2.0 2.2 0.03 0.14 2.0 6.85 7.86 February 2.7 2.0 0.05 0.13 2.0 6.64 7.47 March 3.6 2.0 0.11 23.48 2.0 6.80 7.72 April 4.3 2.0 0.14 0.23 2.0 6.49 7.92 May 4.4 3.6 0.14 3.701 2.0 6.50 7.78 June 2.5 2.5 0.672 0.13 2.0 6.18 7.34 July 2.8 3.8 0.433 0.75 3.7 6.29 7.66 August 4.4 3.6 0.14 0.10 2.0 6.50 7.78 September 2.8 2.3 0.07 0.13 2.0 6.39 6.98 October 2.0 3.0 0.11 0.10 2.0 6.64 7.48 November 3.8 2.5 0.04 0.10 2.0 6.93 7.67 December 2.8 2.5 0.04 0.10 2.0 7.26 7.79 Annual Average 3.2 2.7 0.16 2.42 2.1 6.6 7.6 Table 1 - Summary of Monthly & Annual Average Final Effluent Concentrations

1 Monthly Average TAN Concentration exceedance voluntarily reported to MOECC on June 13, 2017. ECA Effluent Limit Conditions not in effect until May 31, 2017. 2 Monthly Average TP Concentration exceedance reported to MOECC July 6, 2017. 3 Monthly Average TP Concentration exceedance reported to MOECC August 10, 2017.



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Final Effluent Results while Micro C Dosing in Effect

Month

Acute Toxicity (%) Chemical Oxygen Demand (mg/L) Dissolved Oxygen (mg/L)

Sodium (mg/L) Chloride (mg/L)

Trigger Point: Lethal - DM

Trigger Point: Lethal – RBT

Trigger Point: >25 mg/L Trigger Point: 120 mg/L

Maximum Concentration

Average Concentration

Minimum Concentration



January 0 0 25 25 7.4 54.7 250 February 26 26 8.3 March 51 51 8.5 71.7 120 April 704 0 58 58 8.5 100 85 May 10 0 38 38 7.1 132 110 June 34 34 5.8 July 0 0 40 40 6.3 144 58 August 23 23 5.6 55.9 57 September 19 19 4.9 October 18 18 6.4 93.7 58 November 0 0 15 15 6.8 December 21 - - Annual Avg.

22.5 31.5 6.9

93.1 105.4

Table 2 – Micro C BOD Augmentation Effluent Result Summary

4 Acute Lethality reported to MOECC on May 9, 2017. Resample collected on May 2, 2017.



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Monthly Average and Annual Average Final Effluent Waste Loadings

Month

Monthly CBOD Average Waste Loading (kg/d)

Annual Average CBOD Waste Loading (kg/d)

Limit: 4.25 kg/d

Monthly Total Suspended Solids Average Waste Loading (kg/d)

Annual Average TSS Waste Loading (kg/d)

Limit: 4.25 kg/d

Monthly Total Phosphorus Waste Loading (kg/d)

Limit: 0.09 kg/d

Annual Average TP Waste Loading (kg/d)

Limit: 0.09 kg/d

Monthly TAN Waste Loading (kg/d) Limit: 1.28 kg/d

January 0.03 0.03 0.000 0.002 February 0.08 0.06 0.001 0.004 March 0.05 0.03 0.002 0.352 April 0.16 0.08 0.005 0.009 May 0.14 0.12 0.004 0.118 June 0.06 0.06 0.016 0.003 July 0.05 0.06 0.007 0.013 August 0.14 0.12 0.004 0.003 September 0.08 0.07 0.002 0.004 October 0.08 0.12 0.004 0.004 November 0.20 0.13 0.002 0.005 December 0.11 0.10 0.002 0.004 Annual Avg. 0.10 0.08 0.005 0.04 Table 3 - Monthly & Annual Average Final Effluent Waste Loading Summary



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Summary of Raw Sewage Monthly Average Concentrations

Date

Monthly Average BOD5 Concentration (mg/L)

Monthly Average TSS Concentration (mg/L)

Monthly Average TP Concentration (mg/L)

Monthly Average TKN Concentration (mg/L)

January 67.0 91.0 2.8 32.8 February 61.0 50.0 4.1 45.4 March 54.0 740.0 3.9 46.3 April 42.0 55.0 3.5 40.0 May 77.0 176.0 4.7 48.5 June 105.0 149.0 5.3 56.2 July 218.0 216.0 5.5 48.7 August 77.0 176.0 4.7 48.5 September 215.0 162.0 6.0 53.4 October 153.0 147.0 5.2 51.1 November 155.0 138.0 4.4 42.3 December 332.0 189.0 6.8 63.0 AVERAGE 129.7 190.8 4.7 48.0 Table 4 - Summary of Raw Sewage Monthly Average Concentrations



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Plant Flow Monitoring Data Month Average Daily Flow (m3/d)

Max Daily Flow (m3/d) Total Monthly Flow (m3/month)

Rated Capacity: 213 m3/d Peak Rated Capacity: 436 m3/d January 14 35 425 February 28 122 795 March 15 84 480 April 38 138 1,135 May 32 132 987 June 24 39 710 July 17 27 526 August 32 132 987 September 30 43 896 October 39 105 1,221 November 52 73 1,549 December 40 75 1,243 Total Plant Flow for 2017 = 10,954 m3 2017 Average Daily Influent Flow = 30 m3/d * Operating at 14% of Rated Capacity in 2017. Table 5 - Plant Flow Monitoring Summary



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Summary of Bypass, Spill, and abnormal discharge Events Table 6 - Summary of Bypass, Spill, and abnormal discharge Events

STONECREST ESTATES SEWAGE TREATMENT PLANT BYPASS AND SPILL SUMMARY Month Date Duration

(hours) Type of

Bypass/Spill, Abnormal

Discharge Event

Volume (m3)

Results CBOD TSS TP TAN Geometric

mean E. Coli

May May 1 NA Spill 0.05 Not applicable. Representative of diluted Raw Sewage. Material spilled

onto pavement was hosed down, screenings shoveled, and disposed of.

July July 16 NA Spill 0.01 Not applicable. Representative of diluted Raw Sewage. Material spilled

onto pavement was hosed down, screenings shoveled, and disposed of.



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Analysis of Final Effluent Monitoring Data

Carbonaceous Biochemical Oxygen Demand (CBOD) / Biochemical Oxygen Demand (BOD)

The Stonecrest Estates STP had until May 31, 2017 to come into compliance with Effluent Limits established by the ECA. The facility has an Annual Average Concentration and Annual Average Waste Loading Final Effluent Limit associated with CBOD. It was established early on in the operation of the facility, that the Raw Sewage did not contain enough BOD source to support the biological growth required at the facility; therefore, a chemical named Micro C 2000 was used to supplement the BOD source until the Stonecrest development area had more homes occupied. The ECA included a chemical system shutdown date no later than November 30, 2017.

It is apparent from Figure 1 that the Effluent CBOD Concentrations were maintained below the allowable Effluent Limit for the entire Reporting Period, however, bordered on the Objective. This is in part due to some of the operational issues the facility encountered during the year, and the facility still being newly in operation. Figure 2 depicts Waste Loadings well below the Effluent Limit primarily due to the low Effluent discharge flows. Figure 3 provides a good indication of the steady increase in Raw Sewage BOD Concentration throughout the year. The Annual Average CBOD Concentration in the Effluent was calculated to be 3.2 mg/L; the facility effectively removed 96.2% BOD through the treatment process.

Figure 1 - Monthly Average CBOD Concentration vs. Limit & Objective



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Figure 2 - Monthly Average CBOD Waste Loading vs. Effluent Limit

Figure 3 - Raw Sewage Concentrations vs. Effluent Concentrations



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Total Suspended Solids (TSS)

It is apparent in Figures 4 and 5 that the facility consistently measured Effluent TSS below the allowable Effluent Limits, and Monthly Average Concentration Objective, throughout the Reporting Period. The facility achieved an Annual Average TSS Concentration of 2.7mg/L. A sharp increase in Raw Sewage Concentration plotted in Figure 6 occurs in March, 2017. This was due to a significant infiltration event that originated from a new property development. An excessive volume of silt/sandy water entered the facility and was pumped through the facility. The City had to empty each of the tanks, and clean the membrane cassettes manually as a result.

With this, the facility has still proven effective with average 98% removal efficiency throughout the Reporting Period.

Figure 4 - Final Effluent Monthly Average TSS Concentration vs. Limit & Objective



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Figure 5 - Final Effluent TSS Waste Loading vs. Effluent Limit

Figure 6 - Raw Sewage TSS Concentration vs. Final Effluent Concentration



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Total Phosphorus (TP) The City identified early on in the operation of the facility that Raw Sewage TP concentrations are relatively high at this facility, measuring an average 4.7 mg/L annually. The facility is effectively managing TP removal throughout the bulk of the Reporting Period, however, in June and July exceeded the allowable Effluent Limit. Staff worked to understand the cause of the elevated TP concentrations, as chemical dosage modifications were not impacting the removal. It was later determined that higher pH values in the Aeration Tank were the cause of the poor removal. Staff have targeted a lower operating pH, by increasing caustic soda dosage, as a result.

Figure 7 - Monthly Average Effluent TP Concentration vs. Limit & Objective



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Figure 8 – Final Effluent TP Waste Loading vs. Effluent Limit

Figure 9 - Raw Sewage TP Concentration vs. Effluent TP Concentration



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Ammonia (NH3) / Ammonium (NH4+)

The measure of both Ammonia and Ammonium is called the Total Ammonia Nitrogen (TAN) content. Since the facility was designed to facilitate Nitrification, a Monthly Average TAN Effluent Limit and Objective have been established in the ECA. It is apparent in Figure 10 below that an issue arose in March where TAN concentration was measured well above the allowable Limit. This was due to the facility reseeding after an infiltration event, though the nitrification process quickly recovered by the next month. A second exceedance, though not quite as severe as the March event, occurred in May, 2017. The cause was a second infiltration event where the facility required reseeding. When the facility was put back online, the TAN concentration was quite high for one sample set. Similar to the earlier event, the nitrification process quickly recovered.

Figure 10 - Effluent Monthly Average TAN Concentration vs. Limit & Objective

0.0

5.0

10.0

15.0

20.0

25.0

Jan-

17

Feb-

17

Mar

-17

Apr-

17

May

-17

Jun-

17

Jul-1

7

Aug-

17

Sep-

17

Oct

-17

Nov

-17

Dec-

17

Conc

entr

atio

n (m

g/L)

Month

Monthly Average Final Effluent TAN Concentrations vs. Limit and Objective

Monthly AverageFinal Effluent TANLimit (mg/L)

Final Effluent TANObjective (mg/L)

Monthly AverageTAN Concentration(mg/L)



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Figure 11 - Final Effluent TAN Waste Loadings vs. Effluent Limit

Geometric Mean Density of E. Coli

Membrane treatment technology is proven effective in pathogenic organism removal, specifically E. Coli, as the pore-size of the membrane plates are smaller than an E. Coli cell. This means that E. Coli can not readily pass through a membrane. The facility has UV Disinfection in place, however sample results have shown that E. Coli concentrations, post membrane pre-UV Disinfection, are less than 2 cfu/100mL consistently, therefore the Geometric Mean Density of E. Coli has been well below the allowable Limit of 100 cfu/100mL throughout the Reporting Period.

0.000.200.400.600.801.001.201.40

Was

te L

oadi

ng (k

g/d)

Month

Monthly Average Final Effluent TAN Loading vs. Limit

Monthly Average FinalEffluent TAN WasteLoading Limit (kg/d)

Monthly Average TANLoading (kg/d)



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Figure 12 - Final Effluent Geometric Mean Density of E.Coli vs. Limit & Objective

Final Effluent pH 158 Final Effluent samples were collected and tested for pH throughout the Reporting Period. It is important to note that pH measurements used to determine compliance with the ECA have no QA/QC measures in place, other than routine calibration procedures of the pH probe. Figure 12 below provides evidence the pH was maintained within compliance Limits throughout the Reporting Period.

Figure 13 - Final Effluent pH values vs. Upper/Lower Limits



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Summary and Interpretation of Final Effluent criteria associated with Micro C addition.

As mentioned previously in this Report, the facility was permitted to dose a chemical called Micro C 2000 for Raw Sewage BOD augmentation. This chemical is pumped into the Anoxic tank through odour control chemical dosing pumps. Direction provided by MOECC Approvals Branch required the City to sample and test the Final Effluent for:

• Acute Toxicity; • Chemical Oxygen Demand; • Dissolved Oxygen; • Sodium; and, • Chloride.

A ‘Trigger Point’ was assigned to most of these parameters as outlined in Table 2 – Micro C BOD Augmentation Effluent Result Summary on page 6. In accordance with ECA Condition 2, the BOD augmentation system would be shut down by November 30, 2017. The City complied with this requirement, and submitted notice to MOECC on December 1, 2017. Throughout the Reporting Period, the City provided some 10 notifications of various exceedances to the Water Supervisor of the MOECC. In effort to meet the Effluent criteria, City staff reduced Micro C dosages throughout the reporting period and finished with an approximate 3 – 4 L of chemical used per day.



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Summary of Operating Problems throughout Reporting Period

Throughout the report, several operating problems encountered throughout the year have been discussed. Outlined below is a summary of those Operating Problems:

Month Affected Days Description of Operating Problems

Environmental impact assessment

March March 6 - 19 Facility taken offline and all process tanks emptied due to infiltration event introducing inert sand/silt material. Facility reseeded March 19, put back into service.

No environmental impact. All raw sewage hauled to Trenton WWTP Collection System.

May May 13 – May 17 Facility taken offline and process tanks emptied due to infiltration event introducing inert sand/silt material. Facility seeded May 17, went online May 18.

No environmental impact. Raw Sewage hauled to Trenton WWTP Collection System.

Summary of Maintenance performed throughout Reporting Period

In addition to an active maintenance management program, Works were upgraded as follows:

• Headworks fine screen, screenings collector system modified.

Summary of Biosolids Generated in 2017

There were no biosolids generated during the Reporting Period. At current ADF, and plant operating conditions, the facility is not expected to produce any Biosolids until 2018.



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Summary of Effluent Quality Assurance and Control Measures

The Stonecrest Estates STP Operator collects samples from Raw Sewage, Anoxic Tank, Aeration Tank, Membrane Tank, and Final Effluent on a regular basis throughout the week. The samples are tested for various parameters in-house for process control and effluent quality assurance. A spreadsheet is used to track in-house lab results and plant performance data. In addition to the in-house analysis, samples are collected weekly and sent to a certified laboratory – SGS Environmental Services. These sample results are used to determine compliance with the ECA, as the City does not have approved QA/QC measures in place for their in-house testing to qualify accuracy of results.

Summary of Calibration and Maintenance carried out on Final Effluent Monitoring Equipment

Work Orders are generated on a regular basis for the maintenance of the Final Effluent composite sampler and associated equipment. The Flow monitoring equipment was not captured in the Preventative Maintenance Program asset list, and was missed being calibrated with the scheduled annual work in July. It was however calibrated in January, 2018. See Figure 14 below for a copy of the annual calibration report.



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Figure 14 - Annual Flow meter calibration report.



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Summary of Complaints received throughout the Reporting Period

There were no complaints received by City staff for the Stonecrest Estates Sewage Treatment Plant throughout the Reporting Period.

Closing Remarks

The Stonecrest Estates Sewage Treatment Plant is the first membrane treatment process to be installed in Quinte West. Apart from the two infiltration events that occurred during the Reporting Period, subsequently creating treatment issues wherein Effluent Limits were exceeded, the facility generally performed well.

Table of FiguresExecutive SummarySummary and Interpretation of Monitoring DataSummary of Bypass, Spill, and abnormal discharge EventsAnalysis of Final Effluent Monitoring DataCarbonaceous Biochemical Oxygen Demand (CBOD) / Biochemical Oxygen Demand (BOD)Total Suspended Solids (TSS)Total Phosphorus (TP)Ammonia (NH3) / Ammonium (NH4+)Geometric Mean Density of E. ColiFinal Effluent pH

Summary and Interpretation of Final Effluent criteria associated with Micro C addition.Summary of Operating Problems throughout Reporting PeriodSummary of Maintenance performed throughout Reporting PeriodSummary of Biosolids Generated in 2017Summary of Effluent Quality Assurance and Control MeasuresSummary of Calibration and Maintenance carried out on Final Effluent Monitoring EquipmentSummary of Complaints received throughout the Reporting PeriodClosing Remarks

Stonecrest Estates Sewage Treatment Plant 2017 Annual Report · 2018. 4. 9. · Stonecrest Estates Sewage Treatment Plant Annual Report 3 Executive Summary . The Stonecrest Estates

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