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TRANSCRIPT
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Dealing with Unexpected Wastewater Treatment Plant
Disruptions
February 16, 2017
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Location Map
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WPCP History
• Original WPCP constructed on this site in 1928 consisting of primary treatment and chlorination;
• In 1958, pre-treatment of sewage began, with the installation of a bar screen and grit removal;
• Major expansion in 1967: secondary treatment established with the addition of aeration tanks an a secondary clarifier;
• Construction of the Orangeville Reservoir (now called Island Lake) began in 1968 and was completed in 1970 in order to provide flow augmentation during drought periods to ensure sufficient dilution of WPCP effluent;
• Major expansion in 1975: tertiary treatment established with the installation of a sand filter;
• Major expansion in 1985: addition of de-nitrification tanks, changing the process to pre-de-nitrification.
• Major expansion 2015 – 2018: increase plant capacity and significantly improve the monitoring and control capabilities.
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WPCP Treatment Process
Influent Screening/ Raw Sewage Pumping
Aeration
Secondary Clarification
Disinfection
Filtration
Dechlorination
Denitrification
Grit Removal
Aeration
Secondary Clarification
Denitrification
Grit Removal
“Old Plant” “New Plant”
Flow Splitting Chamber
Sludge Thickening/ Anaerobic Digestion/
Sludge Storage
Credit River Outfall
Raw Sewage
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Orangeville Water Pollution Control Plant
New Plant
Chlorination
Screening & Pumping
Old Plant
Tertiary Filtration
Biosolids Digestion & Storage
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Planning for Abnormal Operating Events
• Standard Operating Procedures (SOPs)– Bypass Events– Taking Process Equipment Out of Service– Process Disturbances
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Planning for Abnormal Operating Events: Bypass
• Primary Bypass– Rarely occurs– Raw sewage flows exceed raw
sewage pump capacity– Entire treatment process is
bypassed for a portion of the raw sewage
– Raw sewage bypassing the treatment plant is chlorinated and dechlorinated
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WPCP Treatment Process
Influent Screening/ Raw Sewage Pumping
Aeration
Secondary Clarification
Disinfection
Filtration
Dechlorination
Denitrification
Grit Removal
Aeration
Secondary Clarification
Denitrification
Grit Removal
Flow Splitting Chamber
Sludge Thickening/ Anaerobic Digestion/
Sludge Storage
Credit River Outfall
Raw Sewage
Disinfection
Dechlorination
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Planning for Abnormal Operating Events: Bypass
• Partial Tertiary Bypass– Occasionally occurs– A portion of the wastewater flows
bypasses filtration– Preliminary treatment,
primary/secondary treatment, chlorination and dechlorinationstill occurs
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WPCP Treatment Process
Influent Screening/ Raw Sewage Pumping
Aeration
Secondary Clarification
Disinfection
Filtration
Dechlorination
Denitrification
Grit Removal
Aeration
Secondary Clarification
Denitrification
Grit Removal
Flow Splitting Chamber
Sludge Thickening/ Anaerobic Digestion/
Sludge Storage
Credit River Outfall
Raw Sewage
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Planning for Abnormal Operating Events: Bypass
• Following the implementation of emergency bypass procedures, WPCP Operators are required to notify:– Operations Centre Manager– Spills Action Centre– Credit Valley Conservation– Medical Officer of Health
WPCP
Town Hall
CVC
MOH
SAC
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Planning for Abnormal Operating Events: Process Equipment Out of Service
• Usually a “planned” event• SOPs for Clarifiers• SOPs for Denitrification/Aeration Tanks• Informal agreement with CVC for advance
notification of planned shutdown; MOECC copied on notification
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Planning for Abnormal Operating Events:
Process Disturbances
• Bulking sludge• Hydraulic overload• Digester Foaming• High solids build up in
filters• Toxic influent• Clarifier rake arm high
torque
• Chemical spill• Accidental chemical
mixing• Sludge spill at loading
area• Power failure• Clogged air lift in air grit
classifier
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Case Study – Spring 2001
Background• OCWA operated the WPCP on behalf of the
Town from 1993 through 2011• Extra biosolids storage was required in
winter/spring 2000/2001– Early snowfall in Fall 2000 restricted end-of-
season land application– Few fields to spread biosolids in early spring
• Additional offsite storage was still insufficient
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Case Study – Spring 2001
• A New Plant aeration cell converted into temporary storage for sludge
• Prevented solids from being discharged to Credit River
BUT• Remaining treatment capacity
overextended– Digesters/sludge storage tank
overflowed– Excessive odour from remaining
aeration cells (biological process upset)
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Case Study – Spring 2001
Solution• Partially treated solids removed off-site for
final treatment– Digester could not handle increased solids– Arrangements made with Shelburne and Fergus
• Additional blower brought online to improve nitrification and allow biological process to recover
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Case Study – Spring 2001
• Raw sewage samples indicated organics concentrations higher than the design capacity of the WPCP
– Investigate to determine source of high BOD loading
– Improve their manufacturing processes to reduce BOD in wastewater
– Enter into an overstrengthagreement
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Case Study – Spring 2001
Going Forward• Improved communication between OCWA and Town
Staff• Increased sampling and testing frequency at the WPCP• Maintain a reliable source for additional blower(s) in
the event they are required in the future• Consider alternatives to land spreading, such as a
dewatering facility and/or portable dewatering equipment
• Establish a contingency plan to deal with such emergencies
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Case Study –Spring/Summer 2016
Background
• Late April 2016: contractor accidently knocked concrete blocks into one of the New Plant Clarifiers.
• Procedure to take clarifier off line was implemented
• Early May 2016: Clarifier brought back on-line; sample results revealed high ammonia levels in the New Plant
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Clarifier at WPCP
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Case Study –Spring/Summer 2016
Solution:1. Run all New Plant blowers simultaneously;
2. Seed the New Plant with solids from the Old Plant; and
3. Daily sampling for ammonia and DO in all five aeration tanks.
• After peaking in mid-May, ammonia levels declined, but still high
• WPCP was out of compliance with the Environmental Compliance Approval for Ammonia for the month of May
• The MOECC were informed that the WPCP was out of compliance
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• Elevated levels of ammonia, nitrogen and CBOD detected in May 25th samples from Credit River
• This information was immediately shared with CVC and MOECC staff
• Frequency of Credit River monitoring for 2016 increased to twice monthly
Case Study –Spring/Summer 2016
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Case Study –Spring/Summer 2016
• Early June WPCP effluent results showed an increase in ammonia levels
• Outside treatment process consultants were contacted for their assistance
• Mid-June ammonia levels within compliance limits.
• Ammonia levels spiked again at the end of June, hovered around the compliance limit for much of July, and spiked again in late July and continued to remain high through mid-August
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Case Study –Spring/Summer 2016
• Additional consultation with experts –recommended increasing aeration capacity
• August 10th: new blower brought on-line
• August 11th: ammonia levels dropped well below the compliance limit
• Ammonia levels have remained at these levels since that time
• CVC and MOECC staff were provided with weekly updates throughout this event
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Case Study –Spring/Summer 2016
Going Forward• Standard Operating Procedure for taking a Clarifier
off-line to be revised to include the need to remove the solids from the bottom of the tank immediately
• Expanded WPCP will include significantly more aeration capacity and new aeration piping
• WPCP expansion includes significant improvements to our monitoring and control capabilities
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Thank you!!