Report on the 1991 discharges from municipal sewage treatment plants in Ontario

110 Pages·1992·2.8 MB·English

by  Ontario. Water Resources Branch

REPORT ON THE 1991 DISCHARGES
FROM
MUNICIPAL SEWAGE TREATMENT
PLANTS ONTARIO
IN
Volume 1 - Summary of Performance
and Compliance
SEPTEMBER 1993
®
Ministryof
Ontario Environment
and Energy

ISSN 1183-8787
REPORT ON THE 1991 DISCHARGES
FROMMUNICIPAL SEWAGE TREATMENT PLANTS
IN ONTARIO
SEPTEMBER 1993
Cettepublication technique
n'est disponible qu'en anglais.
Copyright: Queen's Printer for Ontario, 1993
This publication may be reproduced for non-commercial purposes
with appropriate attribution.
log 93-2307-037
PIBS 2685E01

REPORT ON THE 1991 DISCHARGES FROM
MUNICn»AL SEWAGE TREATMENT PLANTS IN ONTARIO
Report prqjared by:
Water Resourœs Branch
in cooperation with
Regional Operations Division
Ontario Ministry ofEnvironment and Energy

ABSTRACT
T(hSiTsPsr)epoorpteriastaedsubmymtahreyMoifnitshterpyeroffoErnmvainrcoenomfen4t23asnedwaEgneertgryea(tmMeOntEEpl)antosr
municipalitiesthatdischargeeffluentdirectlyintothesurfacewatersofOntarimo
itnhe19C9e1r.tifPilcaanttepoefrf/o^rpmraonvcaelw(aCsoafssAe)ssoerdiangatihnestaebistehnecrethoeflCimiotfsAstilpiumlitast,edthe
guidelines in MOEE PoUcy 08-01 "Levels of Treatment for Municipal and
Private Sewage Treatment Works Discharging to Surface Waters" and the
Canada-US Agreement on Great Lakes Water QuaUty. Effluent quality was
assessedagainstthreeconventionalparameters : BiochemicalOxygenDemand
(BODs), Suspended SoUds (SS) and Total Phosphorus (TP).
The report is divided into two volumes. Volume I provides a summary of
performance and compHance. Volume H presents the individual plant
performance data.
InVolume I, sixty-two (62) STPs were assessed against C ofAlimits and 325
STPs were assessed against MOEE Pohcy effluent guidelines. The overaU
compliance rate is 76% in 1991.
Inthereport, compUancestatus,remedialactionprograms,wasteloadingsand
plant bypasses were summarized. Historical trends on STP compUance rates
and waste loadings discharged to the environment were analyzed. STP
operation and abatement program were explained. The diffemet types of
sewage treatmentplantsinOntarioandtheireffectivenesswere also discussed.
AU STPs were ranked by their performance. The performance of a STP was
assessed by comparing its effluent average concentration to its Umit
requirementsforBOD, SS andTP. Thetenbestand the tenworstperformmg
STPs were identified in the report.
In Volume H, individual plant bypass and perfonnance data are presented.
The data is provided in a computer diskette, together with a menu-driver
program to access the information.

11
TABLE OF CONTENTS
Page
Executive Summary
1.0 Introduction
1. DischargeReporting 1
1.2 Howto UseThis Report 1
2.0 STP Effluent Requirements
2.1 TheSignificanceofConventionalParameters 3
2.2 CertificateofApprovalLimits 3
2.3 MOEE PolicyEffluentGuidelines 4
3.0 1991 Status ofCompliance And Remedial Measures
3. Assessmentby CertificateofApproval Limits 6
3.2 AssessmentbyMOEEPolicyEffluentGuidelines 11
3.3 Summary ofAssessment 12
3.4 Ranking ofSTPsby Performance 14
3.5 Remedial Measures 17
4.0 1991 WasteLoadings and Bypasses
4.1 WasteLoadings 19
4.2 Bypasses 23
5.0 Historical Trends
5.1 STP Compliance 25
5.2 Loading 25
6.0 STP Operation and Abatement
6.1 OperatingAuthority 30
6.2 AbatementProgram 30
6.3 Enforcement 32
7.0 Sewage Treatment Plant Sector Profile
7.1 GeographicDistribution 34
- 7.2 DistributionofSTPsby TreatmentTypes 34
7.3 Effectiveness ofDifferentTreatmentTypes 35
8.0 Inquiries 43
9.0 Reference 43
Glossary ofTerms 44
Appendices '^^
LIST OF APPENDICES
Page
Appendix A SummaryofSTPPerformance against 47
CertificateofApprovalLimits 1991
Appendix B ListofComplying STPs Assessed against 53
MOEE
PolicyEffluentGuidelines 1991
Appendix C ListofNon-Complying STPs Assessed against 67
MOEE
PolicyEffluent Guidelines 1991
Appendix D Reported Bypass Occurrence 1991 74
Appendix E Addresses andPhoneNumbers ofMOEE 80
Regional and DistrictOffices