The MBBR process is an attached growth biological wastewater treatment process. In the conventional attached growth biological treatment processes, like trickling filter or RBC systems, the microorganisms are attached to a medium that is fixed in place and the wastewater being treated flows past the surfaces of the medium with their attached biological growth. In contrast, an MBBR process utilizes small plastic carrier media upon which the microorganisms are attached. The carriers are made of a material with a density close to the density of water. The carriers will be mixed in the tank by the aeration system and thus will have good contact between the substrate in the influent wastewater and the biomass on the carriers.
The MBBR treatment processes typically take place in a tank similar to an activated sludge aeration tank. The carrier media are kept suspended by a diffused air aeration system for an aerobic process or by a mechanical mixing system for an anoxic or anaerobic process, as illustrated in the figures below. A sieve is typically used at the MBBR tank exit to keep the carrier media in the tank.
These solutions significantly increase the capacity and efficiency of existing wastewater treatment plants, while minimizing the size of new plant deployments. This method makes it possible to attain good efficiency results of disposal with low energy consumption. This process is used for the removal of organic substances, nitrification and denitrification.
The bacteria/activated sludge grow on the internal surface of the carriers. The bacteria break down the organic matter from the waste water. The aeration system keeps the carriers with activated sludge in motion. Only the extra amount of bacteria growth, the excess sludge will come separate from the carriers and will flow with the treated water towards the final separator
The MBBR system is considered a biofilm process. Biofilm processes in general require less space than activated sludge systems because the biomass is more concentrated, and the efficiency of the system is less dependent on the final sludge separation.
MBBR systems don’t need a recycling of the sludge, which is the case with activated sludge systems.
Some other advantages compared to activated sludge systems are:
- Higher effective sludge retention time (SRT) which is favorable for nitrification
- Responds to load fluctuations without operator intervention
- Lower sludge production
- Less area required
- Resilient to toxic shock
- Process performance independent of secondary clarifier (due to the fact that there is no sludge return line)
Why treat waste water?
Discharging untreated sewage into any drains other than an underground sewerage system, or into open land, is an offence and invites prosecution under the laws of all Pollution Control Boards in the country.
Sewage must necessarily be treated correctly and then re-used/re-cycled for various uses that do not need potable water quality. Recycling/re-using treated sewage can reduce fresh water requirements vary substantially, by almost 50-60%.
|S.No||Description of the Parameter||Raw Sewage||Treated Sewage|
|2||BOD (Biological Oxygen Demand)||300mg/lit||≤10mg/lit|
|3||COD (Chemical Oxygen Demand)||900 mg/lit||≤30mg/lit|
|4||TSS (Total Suspended Solids)||150mg/lit||≤10mg/lit|
|5||Oil & Grease||50mg/lit||Traces|
Treated sewage can be used for gardening purpose. If client is asking for flushing application, then we have to install UF system.
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