In order to investigate the feasibility of low energy cost limited bulking of sludge containing filamentous bacteria in sequencing batch reactor (SBR)

the start of sludge bulking

the inhibition of excessive bulking and the method maintaining limited bulking were studied by test using actual domestic sewage.The results show that

when pH is in the range of 7.0—8.0 and temperature (23±0.5)℃

continuous water feeding and simple aerobic segment can set up quick lauch hipoxic sludge filamentous bulking.Reducing time of supplying oxygen and pre-set anaerobic phase can effectively inhibit reproduction of filamentous bacteria.After the success of limited bulking starts

the system would be kept steadily at limited bulking state by timely adjustment operation mode of SBR

based on reaction conditions and processing requirements.Handling actual domestic wastewater under hipoxic limited bulking state

the effluent concentrations of NH+4-N

PO3-4-P and SS can controlled separately at 4.5 mg·L-1

0.2 mg·L-1 and 5.0 mg·L-1 below.The progress of biochemical reaction process in each cycle can be real-time understood from the analysis of online parameters like pH

DO and so on.