Water plant optimization study : Hamilton water treatment plant

186 Pages·1994·21.5 MB·English

WATER PLANT OPTIMIZATION STUDY
HAMILTON WATER TREATMENT
PLANT
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JANUARY 1994
Ministry of
Ontario
Environment
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and Energy
227
.H36
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1994
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Copyright Provisions and Restrictions on Copying:
This Ontario Ministry of the Environment work is protected by Grown
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for Ontario. It may he reproduced for non-commercial purposes if'credit is
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It may not he reproduced, in all or in part, part, for any commercial purpose
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contact Service Ontario Publications at coPyri;ht rrc>nlari.cr
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ISBN 0-7729-3298-0
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WATER PLANT OPTIMIZATION STUDY
HAMILTON WATER TREATMENT PLANT
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JANUARY 1994
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Cette publication technique
n'est disponible qu'en anglais.
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Copyright: Queen's Printer for Ontario, 1994
This publication may be reproduced for non-commercial purposes
with appropriate attribution.
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PIBS 2778
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Study Conducted By:
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Pollutech Environmental Limited
Under the Direction of the
Hamilton Project Committee:
Ron Hunsinger - MOEE Water Resources Branch
Bob Patrick - Regional Municipality of Hamilton-Wentworth
Jim Halliday - Regional Municipality of Hamilton -Wentworth
Walter Furry - Regional Municipality of Hamilton-Wentworth
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Nick Ehlert - MOEE West Central Region
Bill Gregson - MOEE Project Engineering Branch
Janusz Budziakowski - MOEE Approvals Branch
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Gerry Sigal - R:V. Anderson Associates Ltd.
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Address all correspondence to:
Ministry of Environment and Energy
Water Resources Branch
40 St. Clair Ave. West, 14'b Floor
Toronto, Ontario
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M4VAM2
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Please note that some of the recommendations contained in this report may have already been
r completed at time of publication. For more information, please contact the local municipality,
or the Water Resources Branch of the Ministry of Environment and Energy.
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Note, all references to Ministry of the Environment in this report should read Ministry of
Environment and Energy.
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Table of Contents Con't
(d) Flash Mixing 34
(e) Flocculation 35
(f) Sedimentation 38
(g) Filtration 39
(h) Clearwells 45
(i) High Lift Pumping 47
fl) Backwash Treatment and Sludge Disposal 50
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CA Chemical Systems 50
(a) Disinfectant 50 '
(b) Coagulant 57
(c) Fluoride 59
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C.5 Sampling 60
C.6 Process Automation 61
C.7 Standby 61
SECTION D PLANT OPERATION 63
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D.1 General Description 63
D.2 Flow Control 65
D.3 Disinfectin Practices 67
D.4 Operation of Specific Components 68
(a) Intakes 68
(b) Screening 68 r
(c) Low Lift Pumping 69
(d) Rapid Mixing and Flocculation 70
(e) Sedimentation
(f) Filters 71
(g) Clearwells 73
D.5 Chemicals 73
(a) Chlorine 73
(b) Alum 74
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(c) Sulphur Dioxide 74
(d) Ammonia 74
(e) Fluoride 75 I
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Table of Contents Cond't
D.6 Sampling & Data Collection 76
D.7 Process Automation 80
D.8 Daily Shift Duties 81
SECTION E PLANT PERFORMANCE 84
E.1 General Overview 84
E.2 Particulate Removal 84
(a) Raw Water Quality 84
(b) Particulate Removal 90
(c) Strategies for Optimum Particulate Removal 95
E.3 Disinfection 97
(a) Efficiency of Disinfection Practices 97
(b) Strategies for Optimum Disinfection 100
E.4 Fluoride 101
E.5 Washwater 102
SECTION F RECOMMENDATIONS 103
APPENDIX A Tables
f APPENDIX B Jar Testing Results
APPENDIX C Daily Log
1 APPENDIX D Plant Waste Study
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EXECUTIVE SUMMARY
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EXECUTIVE SUMMARY
This study of the Regional Municipality of Hamilton-Wentworth's Woodward Avenue
1 Water Treatment Plant was conducted under the Water Plant Optimization Program
of the Ontario Ministry of the environment. Included in this project were reviews of
three years of plant operating and laboratory data, and an assessment of present
conditions with emphasis on particulate removal and disinfection. Details of the raw
water source, flow measurement, process components, plant operation and plant
performance form the body of the report. The appendices contain the laboratory
and plant data for 1984 to 1986, the results of jar test performed during this study,
samples of daily and monthly logs kept at the water plant and a report on plant
waste generation and disposal.
The Hamilton-Wentworth Water Treatment Plant employs treatment process with
coagulation, sedimentation and filtration. Disinfection is achieved with the addition
of chlorine prior to treatment; following filtration ammonia is added to change the
form of chlorine from free to combined. The plant has the capacity to treat 873,000
m3/day and it serves a population of 385,000 in Hamilton, Ancaster, Dundas, Stoney
Creek and Waterdown. To save on electricity costs, the plant operates only at night
on weekdays and 24 hours per day from Friday night to Monday morning.
The treated water is generally of very high quality. With respect to particulate
removal, the average treated water turbidity for the study period (19841986) was
0.38 N U. The bacteriological quality of the water is also good; no positive
presence-absence test results were reported and no total plate count result
exceeded 500 organisms/ml in the study months.
The staff of the Region are interested in optimizing the plant performance and in the
r past, several studies to investigate performance improvement methods have been
initiated. Some of the recommendations in this report have been acted upon since
the start of the study. The following is a summary of the recommendations:
1. Flow measurement: Assess the need to improve the accuracy of the
flow measurement devices.
1 2. Coagulant addition: Establish a jar test procedure to determine
coagulant addition.
3. Streaming current detectors: Investigate further the potential of streaming
current detectors to optimize coagulation.
4. Laboratory reporting: Improve the reporting system to make the data
more available for review and evaluation.
5. Routine laboratory analysis: Review the routine analyses in terms of
usefulness and necessity. tr,cI
Chlorine residual measurement: Develop a data base of the form(s) of
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treated water chlorine residual.
7. Raw water sample fine: Determine if changes in water quality occur in the
laboratory raw water sample line, and if so increase the water velocity.
8. Maintenanoe/Operations responsibilities: Review the policy prohibiting F1
operations staff from calibrating instruments.
9. Consumer complaints: Set up a recording and mapping system for
consumer complaints in order to recognize trends.
10. Operating schedule: Review the current "stop/start' operating schedule.
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