Sequencing Batch Reactor (SBR)

SBR is new technology for the treatment of domestic and industrial wastewaters.The SBR can treat wide range of domestic and industrial wastewaters, at flow ranging from few thousand liters to millions of liters per day.The SBR process can treat any wastewater that can be treated by activated sludge process including anoxic/oxic systems, aerated lagoons, extended aeration processes, trickling filters, rotating biological contactors (RBCS) and oxidation ditches.Like other biological effluent treatment processes SBR works by developing mixed culture of bacteria (biomass) which is effective for removal of BOD, COD and nutrients commonly found in wastewater.The SBR is true batch reactor treatment mode, which does not allow wastewater to enter the reactor during react, settle decant phases.SBR has unique ability to acts as equalization tank, aeration tank and clarifier within single reactor. For large quantities of wastewater flow (more than 500 cubic meters /day) two or more reactors are utilize in predetermined sequence of operation. Each reactor maintains its own treatment regime and all phases of treatment occur in each reactor. Feathers of SBR can be explain as follows- Tolerate variable hydraulic loads Mixed liquor suspended solids cannot be washed away by hydraulic surge since effluent withdrawal is typically accomplished in separate phase following termination of flow to each reactor. Tolerate variable organic loads - Each influent (wastewater input) liquid batch is diluted with previous cycle reactor content. Controls filamentous growthFilamentous microorganisms are control by creating anoxic conditions during fill phase. Provide ideal conditions for settling - Since there is no flow to the reactor during settling and no mechanical sludge collection device stirring" provided ideal conditions for settling.Benefits of SBR 1.It is true reactor treatment system and able to provide consistent effluent quality to desired limits.2.SBR is designed to minimize operation and maintenance cost all equipments accessible from side the plant eliminating the need to dewater. As Floating aerators Submersible mixers Effluent pumps3.Return Activated sludge piping is eliminated.4.Lower Installation costs- Maximum all operation required in effluent treatment are carried out in a single reactor it eliminates need of separate structure for each unit operation this generally result in to lower construction and installation cost.5. Lowest electrical operating cost- Electricity consumption per Kg BOD destroyed is around 1.1 KW as compare to other processes (1.7 KW with conventional activated sludge process).APPLICATIONS Domestic Applications a) Municipalb) Resortsc) Institutions Industrial Applications a) Chemical/ Petrochemicalb) Leachatec) Foodd) Tobaccoe) Paper & Pulpf) Dairyg) Textileh) OCPSF (organic chemicals, plastics ,Synthetics and Fibers)i) SugarCyclic Anaerobic FilterIn Indian climatic conditions anaerobic process is best available process for treatment of effluent. It is most energy efficient process, required less maintenance and nearly operator-free operation. This saves valuable electrical energy. Anaerobic processes have wide range of applications from domestic effluent to distillery effluent (COD range from 600- 90000 mg/L).Effluent coming from various sources will be collected in equalization basin. In equalization basin effluent will be equalized homogenously.In case of larger plants equalization basin is equipped with separate mixing pumps, while in smaller plants (effluent generation less than 100 cubic meters per day) same feed-pump can be use for mixing.Equalized effluent will be sending for anaerobic degradation.In anaerobic degradation process, BOD/COD are converted in to CH4 and CO2 i.e. methane and carbon di oxide. Degradation of BOD/COD is carried out by specially inoculated and acclimatized anaerobic bacteria. This process can be represented as Anaerobic bacteriaC5H7NO2CH4+ CO2Nitrogen and phosphorous are consume by bacteria for their metabolic activities.Cyclic anaerobic degradation is flow-through contact process. In this process wastewater pass over or through biofilm formed by anaerobic bacteria. Organic matter (contributing BOD/COD) in wastewater diffuse in to surface of fixed biofilm layers or granules where they are converted in to primary organic acids subsequently in to gases.Feathersof cyclic anaerobic filter areTolerate variable hydraulic loads Mixed liquor suspended solids cannot be washed away by hydraulic surge since effluent withdrawal is typically accomplished in separate phase following termination of flow to each reactor.Tolerate variable organic loads Unique design of cyclic anaerobic filter increases SRT and minimizes HRT can treat any organic loads.Benefitsof Cyclic anaerobic filtera) It is highly stable system. able to provide consistent effluent quality to desired limits.b) SBR is designed to minimize operation and maintenance cost all equipments accessible from side the plant eliminating the need to dewater. As Effluent recycle pumps Effluent pumpsc)Return Activated sludge piping is eliminated.d)Lower Installation costs- Maximum all operation required in effluent treatment are carried out in a single reactor it eliminates need of separate structure for each unit operation this generally result in to lower construction and installation cost.e)Lowest electrical operating cost This system does not require any aeration equipment or aeration subsequently results in to lower electrical costs.APPLICATIONS a) Domestic Applications Municipal Resorts Institutionsb) Industrial Applications Chemical/ Petrochemical Leachate Food Tobacco Paper & Pulp Dairy Textile OCPSF ( organic chemicals, plastics ,Synthetics a