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Napier-Reid Ltd. 
10 Alden Road, Unit 2,
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Home > Projects> Havelock, Ontario, Canada, Havelock Wastewater Treatment Plant (Sequencing Batch Reactor) 

Havelock, Ontario, Canada, Havelock Wastewater Treatment Plant (Sequencing Batch Reactor)

Project Summary:

Project Type:

Design, Build and Service

Project Category:

Domestic Sewage

Project Purpose:

To treat domestic sewage
Design Flow: 1,200 Cubic Metres/day

Peak Flow:

3,000 Cubic Metres/day
Year of completion: 2010


Full Description:
  1. Major Process Components: Headworks, Sequencing Batch Reactor (SBR), Effluent Equalization, Sludge Digestion, Filtration, PLC control panel.
  2. Napier-Reid Services: Process Design, Instrumentation & Control Design, Electro-mechanical Supplies, Installation and Commissioning Support, Operator's Training
  3. Napier-Reid Scope of Supply:
    1. Mechanical: SBR Tanks (02 Nos): Decanter Assemblies - Napier-Reid SD-3000, Fine Bubble Aeration Systems, Submersible Waste Sludge Pumps, Fittings, and Valves with electrical actuators.
      Effluent Equalization Tank: Submersible Transfer Pumps, Fittings, Valves.
      Aerobic Sludge Digestion Tanks: Fine Bubble Aeration System, Telescopic Supernatant Decant Assembly, Submersible Sludge Transfer Pumps, Fittings and Valves.
      Blower Assemblies for SBR and Sludge Digestion Tanks including Motors and Accessories.
      Alum Feed System: Alum Day Tank (1400 Litres), Metering Pumps, Valves and Tubings.
    2. Instrumentation & Control:
      Control Panel Complete with PLC, Main Disconnect, Fusing, Relays with bases, Wiring Terminals, Operator Interface Panel, PLC and Operator Int-erface Programming.
      SCADA System: Pentium 4 Processor, Hard Drive, Dial-Up Modem, 19" LCD Color Monitor, Color Printer, Hard Drive for Data Backup.
      Float Level Switch, Dissolved Oxygen and Suspended Solids Monitoring System.
      Ultrasonic Level Sensors.
  4. Distinguished Features: Napier-Reid's Decanter Assemblies - Napier-Reid SD-3000, High Quality Effluent, Smaller Footprints, Remote Control, Data Acquisition.
  5. Process Description
    SBR is an aerobic biological system comprising a batch reactor for eliminating pollutants i.e. BOD, COD, TSS, nitrogen and phosphorous. Bio-BatchTM is the SBR designed by Napier-Reid. It is a true interrupted batch feed process, in which, continuous inflow is accommodated through an alternating fill and draw by feeding two or more reactors. A unique feature of the Bio-BatchTM is that there is no return activated sludge (RAS) or secondary clarifier required for solids separation because both aeration and settling occurs in the same reactor. A portion of the sludge is removed from the reactor at a predetermined interval in each cycle to maintain a constant and calculated inventory of activated sludge solids.
    The Bio-BatchTM process is a sequence of five steps; fill / aerate, settle, decant, idle / fill, carried out in a 4 hour cycle.
    Fill / Aerate: Screened and de-gritted raw wastewater is mixed and aerated to satisfy the design oxygen demand. In this step, BOD removal and nitrification takes place. To increase biological performance and eliminate the conditions encouraging filamentous bacteria proliferations, the inlet end of the reactor has a selector zone.
    Settling: Following aeration, the air is shut off and flow is diverted to other reactor(s). A tranquil condition is created in the main aeration zone for efficient sludge settling. During this period anoxic/anaerobic conditions are created for denitrification and biological phosphorous removal.
    Decant: After settling, the clarified supernatant water is decanted through swing type or telescopic type decanter for further processing to meet the discharge standards.
    Fill / Idle: At reduced loadings an idle sequence can be introduced and added to the treatment cycle. When the system is designed for nutrient removal, idle time can also be used during the aeration sequence to create an anoxic/anaerobic condition for denitrification and biological phosphorus removal.
  6. Specified Raw Wastewater Quality:
    BOD5: 250 mg/L
    Suspended Solids: 390 mg/L
    TKN: 35 mg/L
    TP: 9 mg/L
    Temperature: no less than 7oC
  7. Specified Treated Effluent Quality:
    BOD5: 10 mg/L
    TSS: 15 mg/L
    Ammonia-N
        July to October: 3 mg/L
        November to June: 5 mg/L
    TP: 1 mg/L
  8. Photographs:


BioBatch

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