stonecrest estates sewage treatment plant 2019 annual report

0

2019

The Corporation of the City of

Quinte West

Public Works and Environmental Services

Stonecrest Estates Sewage Treatment Plant 2019 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

1

Contents Table of Figures ............................................................................................................................... 2

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

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

Summary of Bypass, Spill, and abnormal discharge Events............................................................ 9

Summary of Operating Problems throughout Reporting Period.................................................... 9

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 of Maintenance performed throughout Reporting Period .......................................... 20

Summary of Biosolids Generated in 2019 .................................................................................... 20

Summary of Effluent Quality Assurance and Control Measures .................................................. 21

Summary of Calibration and Maintenance carried out on Final Effluent Monitoring Equipment21

Summary of Complaints received throughout the Reporting Period ........................................... 23



2

Table of Figures

Table 1 - Summary of Monthly & Annual Average Final Effluent Concentrations ......................... 5

Table 3 - Monthly & Annual Average Final Effluent Waste Loading Summary .............................. 6

Table 4 - Summary of Raw Sewage Monthly Average Concentrations .......................................... 7

Table 5 - Plant Flow Monitoring Summary ..................................................................................... 8

Table 6 - Summary of Bypass, Spill, and abnormal discharge Events ............................................. 9

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 ................................................. 17

Figure 12 - Final Effluent Geometric Mean Density of E.Coli vs. Limit & Objective ..................... 18

Figure 13 - Final Effluent pH values vs. Upper/Lower Limits ........................................................ 19

Figure 14 - Annual Flow meter calibration report. ....................................................................... 22



3

Executive Summary

The Stonecrest Estates Sewage Treatment Plant (STP), assigned 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 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 continuously 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 Sodium

Hydroxide 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 operating in

parallel. This pulls clear liquid through the membranes, while leaving sludge and organisms

behind in the treatment process. Final Effluent receives a UV irradiation 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 – 19);

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

page )

c. A summary of all maintenance carried out on any major structure, equipment,

apparatus, mechanism or thing forming part of the Works;(see page 20)

d. A summary of any effluent quality assurance or control measures undertaken in the

reporting period;(see page 21)



4

e. A summary of the calibration and maintenance carried out on all effluent monitoring

equipment; (see page 21) and,

f. A description of efforts made and results achieved in meeting the Effluent Objectives of

Condition 7. (see pages 5 – 19)

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 20);

h. A summary of any complaints received during the reporting period and any steps taken

to address the complaints;(see page 23);

i. A summary of all by-pass, spill or abnormal discharge events; (see page 9);

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.



5

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

Temperature (deg.C)

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

No Limit MIN Limit: 6.0

MAX Limit: 9.5

January 2.2 2.0 0.11 0.10 2.0 11.5 7.01 7.71

February 3.0 2.0 0.13 0.10 2.0 12.0 6.97 7.50

March 2.0 2.0 0.09 0.10 2.0 17.6 6.98 7.44

April 3.0 2.0 0.05 0.88 2.0 13.9 6.98 7.64

May 6.9 19.7 0.37 0.16 2.0 15.5 6.66 7.40

June 2.0 7.0 0.04 0.10 2.0 20.0 6.71 7.24

July 2.4 2.4 0.06 0.10 2.0 23.2 6.89 7.86

August 2.0 2.3 0.04 0.13 2.0 23.5 6.75 7.12

September 2.0 2.3 0.06 0.13 2.0 20.9 6.59 6.93

October 2.0 2.0 0.06 0.10 2.0 19.5 6.70 7.25

November 2.0 2.0 0.03 0.10 2.0 16.2 6.62 7.34

December 2.0 2.2 0.03 0.12 2.0 13.4 6.49 7.05

Annual Average 2.6 4.0 0.09 0.18 2.0 17.3 6.8 7.4 Table 1 - Summary of Monthly & Annual Average Final Effluent Concentrations



6

Monthly and Annual Average Final Effluent Waste Loading Summary

Month

Monthly CBOD Average Waste Loading (kg/d) Annual Average Waste Loading Limit: 4.25 kg/d

Monthly Total Suspended Solids Average Waste Loading (kg/d) Annual Average TSS Waste Loading Limit: 4.25 kg/d

Monthly Total Phosphorus Waste Loading (kg/d)

Limit: 0.09 kg/d

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

January 0.15 0.14 0.008 0.007

February 0.21 0.14 0.009 0.007

March 0.16 0.16 0.007 0.008

April 0.26 0.17 0.004 0.076

May 0.61 1.75 0.033 0.014

June 0.14 0.49 0.003 0.007

July 0.17 0.17 0.005 0.007

August 0.14 0.16 0.003 0.009

September 0.17 0.19 0.005 0.010

October 0.18 0.18 0.005 0.009

November 0.18 0.18 0.003 0.009

December 0.20 0.22 0.003 0.012

Annual Avg. 0.21 0.33 0.01 0.01 Table 2 - Monthly & Annual Average Final Effluent Waste Loading Summary



7

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)

Monthly Average TAN Concentration (mg/L)

January 260.4 259.2 6.8 64.0 53.64

February 309.0 303.0 7.1 67.5 58.1

March 261.8 279.8 7.5 62.5 53.5

April 248.6 251.8 6.4 58.6 44.9

May 228.0 246.3 5.9 57.4 51.0

June 307.3 299.8 6.9 68.5 60.7

July 381.6 321.2 7.9 79.4 67.4

August 331.5 351.5 6.9 67.5 56.2

September 374.8 350.8 8.4 87.3 80.2

October 390.8 367.8 8.1 71.7 74.2

November 352.8 344.3 8.2 84.5 69.5

December 290.6 273.0 6.1 62.7 50.4

AVERAGE 311.4 304.0 7.2 69.3 60.0 Table 3 - Summary of Raw Sewage Monthly Average Concentrations



8

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 70 93 2,159

February 71 93 2,002

March 79 99 2,452

April 86 121 2,574

May 89 124 2,755

June 70 102 2,103

July 71 91 2,203

August 69 81 2,126

September 83 109 2,488

October 89 117 2,757

November 92 112 2,748

December 98 121 3,024

Total Plant Flow for 2019 = 29,393 m3

2019 Average Daily Influent Flow = 81 m3/d

* Operating at 38% of Rated Capacity in 2019. Table 4 - Plant Flow Monitoring Summary



9

Summary of Bypass, Spill, and abnormal discharge Events

Table 5 - 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 4 0.25 Unplanned Bypass Event: Breach in Membrane integrity

1.3 13 47 0.91 0.2 NT1

May 8 0.75 Unplanned Bypass Event: Breach in Membrane integrity

3.0 12 33 0.58 0.1 NT

Summary of Operating Problems throughout Reporting Period

In addition to the Bypass Events outlined in Table 6 above, the following Operating Problems were experienced at the facility:

As a result of the two (2) Events outlined in the table above, the allowable Monthly Average Concentration of Total Suspended Solids, and

Total Phosphorus was exceeded for the month of May, 2019. The Bypasses occurred as a result of membrane equipment failure,

specifically, faulty unions connecting the membrane skid to the suction discharge hosing. The parts were replaced while Raw Sewage was

hauled and disposed of in the Trenton Wastewater Collection System.

1 NT means Not Tested. Not enough sample volume was collected for E.Coli analysis.



10

On two separate occasions throughout the monitoring period, the City was required to take the plant offline and perform a chemical clean

on the Membrane Skids. While this maintenance activity was conducted, the City contracted a certified waste hauler to haul Raw Sewage

from the Equalization Tank for disposal in the Trenton Wastewater Collection System.

Over the course of the monitoring period extensive labour hours were committed to facility operation as a result of equipment/failures. The

City has been working with the OEM to develop operational solutions for decreasing the amount of intensive labour hours, and mechanical

failures. While some of these issues have generally not affected Effluent Quality, the City is working with the Developer and the OEM to

ensure the facility operates within the originally assured design intentions.



11

Analysis of Final Effluent Monitoring Data

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

Apparent in Figures 1 through 3 is that the facility was able to operate effectively to remove an average 99%

of BOD through the treatment process. With the exception of the month of May, when two (2) Bypass Events

occurred, the facility consistently operated within the Design Objectives established by the ECA. The facility

operated such that the Annual Average CBOD5 Concentration was 2.6 mg/L.

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

0.0

2.0

4.0

6.0

8.0

10.0

12.0

Co

nce

ntr

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n (

mg/

L)

Month

Monthly Average Final Effluent CBOD Concentration vs. Limit and Objective

Final Effluent CBOD5Objective (mg/L)

Monthly AverageCBOD5 Concentration(mg/L)

Annual Average FinalEffluent CBOD5 Limit(mg/L)



12

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

Figure 3 - Raw Sewage Concentrations vs. Effluent Concentrations

0.000.501.001.502.002.503.003.504.004.50

Was

te L

oad

ing

(kg/

d)

Month

Monthly Average Final Effluent CBOD Waste Loading vs. Limit

Annual Average FinalEffluent CBOD WasteLoading Limit (kg/d)

Monthly AverageCBOD Loading (kg/d)

0.0

50.0

100.0

150.0

200.0

250.0

300.0

350.0

400.0

450.0

Jan

-19

Feb

-19

Mar

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Ap

r-1

9

May

-19

Jun

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g-1

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mg/

L)

Month

Raw Sewage and Final Effluent BOD Concentrations vs. % Removal

Raw SewageBODConcentration(mg/L)

MonthlyAverage CBOD5Concentration(mg/L)

% BOD Removal(%)



13

Total Suspended Solids (TSS)

The following Figures provide a clear representation of the calculated Monthly Average Concentration of TSS

throughout the monitoring period. With the exception of May, the facility consistently operated such that

Effluent concentrations and waste loadings measured below the Design Objective and Limits established by

the ECA. The exceedance in May is a direct result of grab sample results obtained in response to two short

duration Bypass Events which occurred during the month. This facility’s ECA currently does not have provision

for calculating the Geometric Mean when there are Bypass Events impacting the monthly average. The facility

is still considered to have operated well throughout the monitoring period as it successfully removed an

average 99% of TSS through the facility.

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

0.0

5.0

10.0

15.0

20.0

25.0

Co

nce

ntr

atio

n (

mg/

L)

Month

Monthly Average Final Effluent TSS Concentration vs. Limit and Objective

Annual Average FinalEffluent TSS Limit(mg/L)

Final Effluent TSSObjective (mg/L)

Monthly Average TSSConcentration (mg/L)



14

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

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

0.000.501.001.502.002.503.003.504.004.50

Was

te L

oad

ing

(kg/

d)

Month

Monthly Average Final Effluent TSS Waste Loading vs. Waste Loading Limit

Annual Average FinalEffluent TSS WasteLoading Limit (kg/d)

Monthly Average TSSLoading (kg/d)

88.0

90.0

92.0

94.0

96.0

98.0

100.0

102.0

050

100150200250300350400

Jan

-19

Feb

-19

Mar

-19

Ap

r-1

9

May

-19

Jun

-19

Jul-

19

Au

g-1

9

Sep

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Oct

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% R

em

ova

l (%

)

Co

nce

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mg/

L)

Month

Raw Sewage and Final Effluent TSS Concentrations vs. % Removal

Raw SewageTSSConcentration(mg/L)

MonthlyAverage TSSConcentration(mg/L)

% TSSRemoval (%)



15

Total Phosphorus (TP)

Apparent in the Figure 7 below is that the calculated Monthly Average Concentration for Final Effluent TP

exceeded the allowable limit in May, 2019. The exceedance is a direct result of grab sample results obtained

in response to two (2) short duration Bypass Events which occurred during the month. This facility’s ECA

currently does not have provision for calculating the Geometric Mean when there are Bypass Events impacting

the monthly average. Operations staff worked to reduce the Final Effluent TP concentration in January and

February by adjusting Operating pH throughout the two months. By March there was a steady decrease in

measured Total Phosphorus residual. As outlined in Figure 9, the facility still receives high concentrations of

Total Phosphorus in its Raw Sewage. The facility used approximately 5,840 L of liquid aluminum sulphate

during the monitoring period, and maintained an average chemical dosage of 130.2 mg/L.

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

0.00.10.10.20.20.30.30.40.4

Co

nce

ntr

atio

n (

mg/

L)

Month

Monthly Average Final Effluent TP Concentration vs. Limit and Objective

Annual & MonthlyAverage Final EffluentTP Limit (mg/L)

Final Effluent TPObjective (mg/L)

Monthly Average TPConcentration (mg/L)



16

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

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

0.000.010.020.030.040.050.060.070.080.090.10

Was

te L

oad

ing

(kg/

d)

Month

Final Effluent TP Waste Loading vs. Limit

Annual & MonthlyAverage Final EffluentTP Waste LoadingLimit (kg/d)

Monthly Average TPLoading (kg/d)

90.091.092.093.094.095.096.097.098.099.0100.0101.0

0.00

1.00

2.00

3.00

4.00

5.00

6.00

7.00

8.00

9.00

Jan

-19

Feb

-19

Mar

-19

Ap

r-1

9

May

-19

Jun

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Sep

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Pe

rce

nt

Re

mo

val (

%)

Co

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mg/

L)

Month

Raw Sewage and Final Effluent TP Concentrations vs. % Removal

MonthlyAverage TPConcentration(mg/L)

Raw SewageTPConcentration(mg/L)

% TP Removal(%)



17

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 the Nitrification process was well

established and maintained throughout the Reporting Period. The facility design has proven quite effective to

nitrify, as an average 99.8% of TKN was broken down to create low level TAN, and Unionized Ammonia

concentrations in the Effluent.

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

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

0.00.51.01.52.02.53.03.54.04.55.0

Jan

-19

Feb

-19

Mar

-19

Ap

r-1

9

May

-19

Jun

-19

Jul-

19

Au

g-1

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Sep

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mg/

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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)

0.00

0.20

0.40

0.60

0.80

1.00

1.20

1.40

Was

te L

oad

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(kg/

d)

Month

Monthly Average Final Effluent TAN Loading vs. Limit

Monthly Average FinalEffluent TAN WasteLoading Limit (kg/d)

Monthly Average TANLoading (kg/d)



18

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 City chooses to sample permeate pump discharge prior to UV Disinfection in

order to establish a dataset that may provide an early warning to a membrane breach. Results at this sample

source have generally been measured <2 cfu/100mL proving that E.Coli cells are not able to pass through the

membrane pores.

Figure 12 below provides a clear representation that Final Effluent E.Coli concentrations are measured well

below the allowable Limit throughout the Reporting Period.

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

0

20

40

60

80

100

120

Ge

om

etr

ic M

ean

De

nsi

ty (

cfu

/10

0 m

L)

Month

Final Effluent Geometric Mean Density of E. Coli vs. Limit and Objective Final Effluent

Geometric MeanDensity of E. ColiLimit (cfu/100 mL)

Final EffluentGeometric MeanDensity of E. ColiObjective (cfu/100mL)



19

Final Effluent pH

213 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 13 below provides evidence the pH was

maintained within compliance Limits throughout the monitoring period.

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

4.0

5.0

6.0

7.0

8.0

9.0

10.0

Jan

-19

Feb

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Mar

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Ap

r-1

9

May

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Jun

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pH

Month

Final Effluent pH values vs. Limits

Final EffluentMinimum pH

Final EffluentMaximum pH

Monthly MIN pH

Monthly MAX pH



20

Summary of Maintenance performed throughout Reporting Period

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

Membrane module maintenance;

Two (2) separate occasions of mechanical cleaning of membrane cassette’s.

A vacuum priming module was installed on the membrane extraction piping.

Summary of Biosolids Generated in 2019

Low volumes of Biosolids were removed from the facility as needed, and hauled to the Trenton Wastewater

Collection System for treatment through the facility.



21

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. See Figure 14 below for a copy of the annual calibration report of the Final

Effluent flow meter.



22

Figure 14 - Annual Flow meter calibration report.



23

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.

stonecrest estates sewage treatment plant 2019 annual report

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