Source: http://www.esemag.com/0300/waterlink.html
WASTE WATER TREATMENT: MBBR - MOVING BED BIOFILM REACTOR TECHNOLOGY
The original wastewater treatment system consisted of a chemical pre-treatment system, followed by an anaerobic system, which in turn was followed by an activated sludge process. with high chemical and operating costs
MBBR system replaced the chemical pre-treatment system. MBBRs were installed between the equalization tank (EQ) and the activated sludge system. Total reactor volume of the MBBRs is designed for different hydraulic retention time for different types of waste water at average flows and than checked against peak flows. Essentially nutrient levels and DO levels are the only control points for the system.
Effluent from the MBBR is sent to a dissolved air flotation unit, which removes 70-90% of the solids generated, prior to being discharged to the activated sludge system.
The MBBR reactors reduced the incoming organic load from an average soluble BOD by 50-70% . This reduction allowed the activated sludge process to treat the ammonia-nitrogen within the wastewater in a more efficient and effective manner, allowing a higher volume of treated water to be discharged to drain. |
The initial MBBR biofilm unit process shaves the loadings peaks and any toxic inhibition effects while removing 50 to 70 percent of the incoming BOD. This pretreatment achieves 2 to 3 times increased capacity compared to a traditional activated sludge process while also being more compact. Furthermore, the MBBR process improves activated sludge characteristics making the activated sludge stage more inherently stable with a waste sludge that is easier to dewater.
The elements provide a large protected surface area for the biofilm and optimal conditions for the bacteria culture to grow and thrive. The biofilm that is created around each carrier element protects the bacterial cultures from operating excursions to yield a very robust system for those industrial facilities loaded with process fluctuations. The biofilm also provides a more stable "home" for the bacteria to grow, so there is less space required compared to other biological systems and far less controls. An MBBR can be designed for a new facility to remove BOD/COD from wastewater streams or for nitrogen removal. Existing activated sludge plants can be upgraded to achieve nitrogen and phosphorus removal or higher BOD/COD capacity . SALIENT FEATURES OF THE SYSTEM: |
Robust
Trouble-Free
- Easy to Operate
- No Media Clogging
- No Sludge Return
Compact
- Small Footprint
- Low Capital Cost
DETAILED DESIGN & ENGINEERING
- Media Retention
- Aeration Grid
to ~3 ppm.
The bacterial cultures digest the soluble organics, gradually mature, and slough from the media. The cultures form a natural floc
which can be easily separated from the water with the DAF unit. In this case and others, no chemical coagulant or polymer were
necessary to achieve < 10 ppm TSS and over 90% BOD removal.
Saleem Asraf Syed Imdaadullah
Mobile : 9899300371
311/22,Zakir Nagar,New Delhi-110025
email: saleemasraf@gmail.com
BLOG: http://saleemindia.blogspot.com
Mobile : 9899300371
311/22,Zakir Nagar,New Delhi-110025
email: saleemasraf@gmail.com
BLOG: http://saleemindia.blogspot.com