MBBR : Mixed Bed Bio-Film Reactor Technology For Sewage Treatment

Conventional waste water treatment technologies like submerged aerated fixed film (SAFF) reactor, Fluidized Aerobic Bio (FAB) reactor, Rotary biological contactors (RBC), Trickling filters or other activated sludge processes have inherent disadvantages of large area of operation, higher power inputs and constant operator attention.

In line with our endeavor to introduce latest technologies related to Water & Waste water treatment, We have developed a Mixed Bed BioFilm-Reactor using attached growth process for Waste water treatment, With specially designed floating air diffuser which are easy to clean (since its floating) & consume only 40% energy as compare to normal air blower. They are absolutely silent in operation & require almost no regular maintenance like oil changing etc. As compared to conventional technologies, Fluidized media reactors are compact, energy efficient and user friendly.

The MBBR process refers to the operation of activated sludge tanks in various configurations in a combination of

• Suspended Biomass
• MLSS [ Mix Liquor Suspended Solids ]
• Attached Biomass
• Such Kind Of Operation Is Generally Classified As Mixed Bed Biofilm Reactor [MBBR]

Basic Principle :

Flock forming organism’s form clusters or attach to available surfaces. The MBBR carrier material allows high biomass concentrations per cubic meter of material, which:

• Control Biomass Activity
• Reduce Operation Cost
• Increases The Specific Volumetric Capacity Of Activated Sludge Tank

The single tank aeration design unit, incorporating a bar screen, a specially designed tank with hybrid fluidized media, a lamella plate clarifier, and tertiary treatment. The bar screen removes larger floating matter and suspended particles. The media significantly increases the surface area for bacterial growth. Air is supplied through surface aerators. The bacteria oxidize the organic matter present in the sewage. The oxidized sewage overflows in the lamella settler. Suspended particles in the treated waste water settle, with a part of the settled sludge sliding back to the aeration tank. Treated water overflows into a chemical contact tank for chlorination (disinfection), after which Multigrade pressure filtration followed by activated carbon wherein the treated water is disinfected & color / smell if any is removed.

Treated effluent from Aeration tank overflows to the lamella plate settler, where finer bio-mass and suspended solids are settled. The settled solids slide back into the Aeration tank, thus reducing the need of a re-circulation pump. Excess bio-mass is periodically removed. The sludge can be taken to Sludge drying beds or can be formed into a cake by using a centrifuge.

Ozonation / UV / Electro Chlorinator May Be Offered As An Alternate To NaOCl[Chlorination]

Clarified water overflows into a chemical contact tank for flocculants / coagulant dosing if required before clarification. Now the treated water is stored in a filter feed tank / chlorine contact tank (Existing) then filtered by passing through a Multi-grade sand filter. The clarified water passes through a Multigrade pressure filtration unit there by reducing the total suspended solids of the water to < 10 levels. This is followed by Activated Carbon followed by Ozonization which would have complete disinfection, COD / BOD reduction to our desired values, colour removal & smell removal. The treated water at the outlet of Ozonization will have a BOD < 15 – 16 ppm, COD < 100 ppm & TSS < 10 ppm.

Advantages Using Mixed Bed Bio-Film Reactor With Aeration :

• Significant Reduction In Space Requirement Due To High Surface Area & Loading Rate Of Media.
• Reduced Power & Maintenance Costs.
• No Moving Parts, Less Maintenance.
• Directly Convertible To UASB System & FMBR System With Minor Modification.