A bench-scale reactor using the SBR process was experimented withsynthetic wastewater. The main purpose of this investigation was toevaluate applicability in the field and process removal efficienciesin terms of BOD, TN and TP and its corresponding kinetic parameters.The removal rate of nitrogen was 71/100 in terms of total nitrogenand that of phosphorus was 77/100 in terms of total phosphorus.Effluent concentrations were 9.8mg/L BOD, 11.2mg/L TN, and 1.1mg/LTP. Effluent concentrations were 9.8mg/L BOD, 11.2mg/L TN, and1.1mg/L TP. Effluent quality was maintained consistently stable bycontrolling decant volume and operating cycles.Denitrification/nitrification were accomplished duringanaerobic/aerobic processes and the conversion rates were4.8mg/kgMLSS/hr and 1.6mg/kgMLSS/hr, respectively. During theanaerobic phase, corresponding to the end of denitrification, the pHprofile showed a maximum due to alkalinity production during thereactions. During the aerobic phase, pH showed a rapid increase dueto CO_2 stripping and pH started to increase again when ammonia nitrogen reached the minimum level. The sludge yield coefficient was0.28 whereas sludge phosphorus luxury uptake was as high as 5.8wt/100at the end of aerobic cycle. Microscopic examination revealed thatmicrocytes that were observed predominantly in sludge wereVorticella, Epistilis, Opercularia, Aspidisca, Chilodonela that areprotozoa as well as Philodina, Rotaria, Notommata, Nematoda that arerotatoria.
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