Major Process Components: Screens, Primary Settling, Rotating Biological Contactor, Clarification, Filtration, PLC control panel.
Napier-Reid Services: Process Design, Instrumentation & Control Design, Electromechanical Supplies, Installation and Commissioning Support, Operator's Training.
Scope of Supply:
Primary Settling Tank (Steel), Three-Stage RBC Module (HDPE) installed in Primary Settling Tank, Carbon Steel RBC Shaft, Media Support Assembly, Drive Assembly and Motor, Load Cell, Bucket Feeder Assembly, Bearings, RBC Enclosure (Fibreglass).
Secondary Clarifier (Steel), Submersible Sludge Return Pumps.
Continuous Backwash Filters including Stainless Steel Filter Tank, Distributors, Under-drain System, Air Compressor with Control Panel.
Chemical Feed System including Tanks and Metering Pumps for Chemicals Dosing.
UV Disinfection System including UV Modules, Steel Channel, Level Control Weir, UV Intensity Monitoring and Cleaning rack.
Instrumentation & Control:
PLC control panel in NEMA-4 Enclosure with Programmable Logic Controller, Switches, Sensors, lights, Alarms and Contacts.
Distinguished Features: Napier-Reid�s Compact Bio-Rotor System with Strong Shaft, Simple Operation , Smaller Footprints, Proven Efficiency, Low Cost.
- Process Description
Raw water from the service station is collected in a pre-equalization tank and equalized flow is then pumped 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 with a thickness of 0.060" (1.5mm) 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 40% of the disk's surface area is submerged in a tank that contains the wastewater. Continuously driven by a gear motor, the media rotates slowly at about 2 rpm. 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 later to filtration and UV disinfection for the remaining suspended solids and micro-organisms reduction to meet the specified effluent quality standards. Alum and Polymer are injected before secondary clarifier and filtration respectively to assist in Phosphorus and suspended solids removal.
BOD5: 600 mg/L
Total Suspended Solids: 960 mg/L
Ammonia: 80 mg/L
TP 10 mg/L
Temperature (assumed): 6~25 oC
Specified Treated Effluent Quality:
BOD5: 10 mg/L
Total Suspended Solids:
<2 mg/L (Summer)
<4 mg/L (Winter)
TP 10 mg/L
<0.3 mg/L (Summer)
<0.5 mg/L (Winter)
Continuous Backwash Filter