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Friday, September 19, 2008

MEAT PROCESSING WASTE WATER TREATMENT LATEST TECH MBBR


Source: http://www.esemag.com/0300/waterlink.html
WASTE WATER TREATMENT: MBBR - MOVING BED BIOFILM REACTOR TECHNOLOGY
The MBBR is a biological aerobic degradation of organic pollutants. The process utilizes millions of tiny, polyethylene biofilm elements that provide a high surface area as a home for a vast, highly active bacteria culture. This fixed film process features a flexible reactor design, the ability to handle load increases without the need for extra tankage, and remains stable under large load variations, including temperature, strength or pH. Like the activated sludge process, the MBBR process utilizes the whole volume of an open tank. Unlike an activated sludge reactor, it does not require sludge return to operate effectively. In MBBR , addition of media quantity and Air Quantity is the Key Factor.
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
  • Stable Under Load Variations
  • Insensitive to Temporary Limitation
  • Consistent Treatment Results
  • Flexible
    • Customizable Reactor Shapes
    • Utilization of Existing Tanks
    • Upgrade Existing Plants
    • Efficient
      • Low Solids Generation
      • Low or No Polymer Required for
      • Liquid/Solids Separation

      • Trouble-Free

        • Easy to Operate
        • No Media Clogging
        • No Sludge Return


        Compact

        • Small Footprint
        • Low Capital Cost













        DETAILED DESIGN & ENGINEERING




        • Media Retention
        • To retain the media within the reator, a stainless steel wedgewire sieve is used. The vigorous action of the moving
      • bed continually scours the surface of the sieve eliminating the need for any maintenance.







        • Aeration Grid
        • A stainless steel grid mounted at the bottom of the reactor is engineered with perforations. The grid is connected to high efficiency
        blowers.. The aeration grid produces a medium bubble which provides the necessary mixing and maintains the dissolved oxygen
        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

        2 comments:

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