Anaerobic-Aerobic attached sequencing batch reactor lab scale performance evaluation related to the orthophosphate removal from secondary treatment effluent

For phosphorus removal, different methods of water treatment system using chemical, physical and biological systems have been used. Sequencing batch reactor system (SBR) is modified activated sludge processes that can removal the excess phosphorus from the municipal wastewater. In this study we evaluates the application of SBR for orthophosphate removing from the secondary treated wastewater in lab scale, and determining the effects of anaerobic detention time, sequencing alternatives and the time proportioning on the phosphorous removal efficiency. In this study by using of a FSBR with the 2 liters useful volume based on the plastic spices as the attached growth bed. Synthetic wastewater feeding has done by using of the starch, glucose, urea and dihydrogen ammonium phosphate. COD of the wastewater was equal to 35 mg/l with Nitrogen and phosphorus content 26 and 12 mg/l respectively. Treatment began with the 24 hr cycle. The numbers of operational series were 5 and the numbers of running days were 5 days. In 4 series of the operations, FSBR steps were filling, anaerobic phase, aerobic phase, rest and discharge, and the anaerobic detention times seri of the operation the steps were first, second, third and fourth seriyal were 4,6,8 and 10 hrs respectively. In seri operation the steps were filling, anaerobic phase, aerobic phase, rest and discharge respectively. Our study showed that the phosphorus removal efficiencies for to series of the operations were 57.5%,52.33%, 55.83% and 33.08% respectively and for the seri of the operations was no any phosphorous removal efficiency. Discussion & The study results showed that by a decreasing the anaerobic phase detention time to 4 hours, (the minimum time),the phosphorous removal efficiency was the maximum, but by sequence changing from anaerobic to the aerobic phase at the beginning step, the phosphorous removal was decreased severely.