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Determination of Bio-Kinetic Parameters for Sequencing Batch Reactor Type Sewage Treatment Plant

The SBR is basically a single tank that serves both as a biological reactor and settler in a temporal sequence; whereas aeration and settling are simultaneous but in a spatial sequence in the continuous-flow activated sludge, they are carried out in the same reactor but in a temporal sequence in the SBR systems. SBR inherently involves a cyclic operation, each cycle incorporating the same pattern of successive selected phases. The objective of the study is determination of Bio-kinetic parameters for SBR type Sewage Treatment Plant. The system was operated under 5 different biomass retention time. The samples from the influent wastewater, mixed liquor and effluent were collected periodically and experimented by the Standard ethods. The data were analyzed and the investigation showed that the the kinetic parameters, yield coefficient (Y), organism decay rate (Kd), BOD removal rate (k), halfvelocity constant i.e.,ubstrate concentration at one half the maximum growth rate (ks) and maximum specific growth rate (µm) which governs the treatment process were found to be 0.67, 0.021 d-1, 0.219 d-1, 80.88 mg/l and 0.147 d-1 respectively. These values are near to the normal range of bio-kinetic values for activated sludge. The higher value of sludge yield (Y) and lower value of organism decay (Kd) shows that there is extremely higher production of excess sludge in the plants. Optimum sludge removal at frequent intervals has to be designed and sludge disposal mechanism has to be developed. A major finding determined from this study is that biomass retention time can be considered for operation control instead of adjusting the MLSS. The biomass retention time can be computed from the sludge wasting. As the computed wasting rate increases, more solids are removed from the system. Selection of optimum of biomass retention time will make system self stabilizing.