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Home > Projects> Mount Brydges, Ontario, Canada, Wastewater Treatment Plant (Rotating Biological Contactor) 

Mount Brydges, Ontario, Canada, Wastewater Treatment Plant (Rotating Biological Contactor)

Project Summary:

Project Type:

Design, Build and Service

Project Category:

Domestic Wastewater Treatment

Project Purpose:

To treat domestic sewage
Design Flow: 5,825 Cubic Metres/day

Peak Flow:

3,330 Cubic Metres/day
Year of completion: 2011


Full Description:
  1. Major Process Components: Level of Control: Automatic
  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:
      Four-Stage 12' RBC Module complete with RBC Shaft, Plastic Media with Steel Tank installed in concrete Primary Settling Tank, Drive Assembly and Motor, Load Cell, Bucket Feeder Assembly, Bearings, RBC Enclosure (Fibreglass).
      Secondary Clarifier Internal Components, Submersible Sludge Return Pumps.
      Deep-Bed Sand Filters: Filter Tanks including Media.
      Chemical Feed System including Tanks and Metering Pumps for Chemicals Dosing System
    2. Instrumentation & Control:
      PLC control panel in NEMA-4 Enclosure with Programmable Logic Controller, Switches, Sensors, lights, Alarms and Contacts ect.
  4. Distinguished Features: Napier-Reid's Decanter Assemblies - Napier-Reid SD-3000, High Quality Effluent, Smaller Footprints, Remote Control, Data Acquisition.
  5. Process Description
    Raw sewage water is introduced to the RBC system for secondary treatment. Napier-Reid's BioRotor is an extremely efficient secondary biological wastewater treatment system that is also well suited for advanced wastewater treatment. It utilizes aerobic fixed film technology to reduce organic matter (BOD5), total suspended solid (TSS), ammonia and phosphorous (P).
    BioRotor system consists of hundreds of thin circular plastic disks, collectively known as media, mounted on a horizontal shaft. Corrugated plastic is used to maintain high structural integrity while maximizing the biologically active surface area which promotes the growth of the many types of bacteria. Around half of the module is submerged in a tank that contains the wastewater. Continuously driven by a gear motor, the media rotates slowly. Bacteria which are naturally present in human waste attach and multiply on the rotating media forming a thin layer of biomass. The rotation carries the biomass and a thin layer of wastewater into the air facilitating the absorption of oxygen. This aerated layer of bacteria is then re-submerged into the water where it metabolizes organic matter from the wastewater producing the required effluent quality. The RBC design provides for optimum aeration eliminating the need for complex and expensive aerators. As the film starts to grow, excess biomass is removed by shearing forces by the disks' rotation in a process called sloughing. The rotating action of the disks also helps keep the solids in suspension.
    Bio-Rotor's effluent proceeds to secondary clarifier for settling and filtration for the suspended solids and later to UV disinfection for micro-organisms reduction to meet the specified effluent quality standards. Alum is injected before secondary clarifier to assist in Phosphorus removal.
  6. Specified Raw Wastewater Quality:
    BOD5 180 mg/L
    Suspended Solids 200 mg/L
    TKN 30 mg/L
    TP 7 mg/L
    Temperature no less than 7C
  7. Specified Treated Effluent Quality:
    BOD5 <10 mg/L
    TSS <10 mg/L
    Ammonia-N <3 mg/L
    TP < 0.8 mg/L
    Dissolved Oxygen 5 mg/L TP <5 mg/L


BioRotor

Napier-Reid
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