rotating biological cont actors
TRANSCRIPT
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Rotating Biological Contactors (RBCs)
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What are rotating biological contactors (RBCs)?
Rotating biological contactors allow the wastewater to come in contact with a biological medium in order to remove pollutants in the wastewater before discharge of the treated wastewater to the environment.
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What are rotating biological contactors (RBCs)?
The Rotating Biological Contactor (RBC) process is one of the most efficient fixed film wastewater treatment technologies.
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The RBC Process
The process consists of large diameter steel or corrugated plastic media centered around a horizontal shaft, placed in a concrete tank.
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The RBC Process
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The RBC Process
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The RBC Process
Biomass thickness ranges from 0.030 inch (0.75 mm) to 0.125 inch (3 mm) depending upon organic concentration, temperature and other process variables.
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Benefits of the RBC process
• Consistent process results• Stable operation – frequent supervision
not required; microbial population accommodates organic and hydraulic fluctuations
• Lower expansion and retrofit costs – modular construction, reduced excavation costs
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Benefits of the RBC process
• Smaller footprint – due to short wastewater retention time
• Minimal head loss through system• Very low energy consumption – on
the order of 3 kW per 3,000 people
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Benefits of the RBC process
• Minimal maintenance – simple drive and bearing lubrication
• Reduced life cycle costs – as compared to suspended growth systems
• Simple operation – no recycle, less lab testing for process control
• Operator friendly
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Applications of the RBC process
The RBC process is used in organic carbon removal (BOD), phosphorus removal, nitrification, denitrification, or various combinations.
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Applications of the RBC process
• Municipal wastewater treatment• Food and beverage wastewater
treatment including meat packing, bakery, dairy, brewery
• Landfill leachate
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Applications of the RBC process
• Refinery and petrochemical wastewater treatment
• Pulp and paper wastewater treatment
• Septage treatment• Many general industrial wastewaters
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Applications of the RBC process
It can also be used in nitrification upgrades, retrofit applications, and in upgrading trickling filter plants.
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RBC equipment
- available with a mechanical drive; with a mechanical drive and supplemental air; or with an air drive only.
- media is available as standard, medium or high density.
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RBC equipment
Conventional low density media RBC
--25 feet long by 12 feet in diameter, --offers over 110,000 square feet of media
surface area
Conventional high density media RBC units--provide over 165,000 square feet of fixed
film surface.
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RBC Process Design Considerations
• Substrate Removal Kinetics• Hydraulic Loading• Organic Loading• Wastewater Temperature
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Table 1. Rotating Biological Contactors vs. Activated Sludge
Points of Comparison RBCs Activated Sludge
Process Stability
does not require recycling; not affected by clarifier
washouts or shock loadings
requires efficient solids settling and adequate bio-
solids recycling
Manpower Less manpower Relatively large manpower
Flexibility
easy to upgrade and expand; typically achieve excellent effluents without
additional control
difficult/costly expansions and upgrades;
troublesome low flow periods
Maintenance and Power Consumption
Power requirement is 25% of activated sludge power
requirement
Comparatively high power requirement
Ease of Nitrification
can achieve any degree of nitrification with only a single settling tank and without sludge recycle
require far more elaborate treatment stages
Sludge Characteristics Settles wellProne to settlement
problems
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Advantages of rotating biological contactors
1. Short contact periods are required because of the large active surface
2. They are capable of handling a wide range of flows
3. Sloughed biomass generally has good settling characteristics and can easily be separated from waste stream
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Advantages of rotating biological contactors
4. Operating costs are low because little skill is required in plant operation
5. Short retention time6. Low power requirements
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Advantages of rotating biological contactors
7. Elimination of the channelling to which conventional percolators are susceptible
8. Low sludge production and excellent process control
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Disadvantages of Rotating Biological Contactors
1. Requirement for covering RBC units in northern climates to protect against freezing
2. Shaft bearings and mechanical drive units require frequent maintenance
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-End of Report-Thank You For Listening! =)
Prepared by:Alforque, Marian Joy B.Cabrera, AnacoritaLasheras, ChristianMiranda, Catherine Mae N.