Research On The Treatment Of Micro-polluted Water By SBBR

The Sequencing batch biofilm reactor (SBBR) is a new complex of the active sludge and biofilm. The granular activated carbon was taken as the padding .The pond bottom mud and the soil were used as inoculant to cultivate biofilm. The Sequencing batch biofilm reactor was used to treat the synthetical micro-polluted water. The effects of the reaction time and water quality on the removal of CODMn and NH3-N were studed. The two processes were determined.The first process is: instant influx water, aeration 5h, halt for aeration and agitation 1.5h, latter aeration 1h, deposition 1.5h and instant exflux water, an entire period is 9h; aeration flux is 0.4m3/h, temperature is 27℃. Basing on CODMn and NH3-N in influx, the removal rate of CODMn, and NH3-N were 35.79% and 21.41% in aeration stage; the removal rate of CODMn, and NH3-N were 27.89% and 53.52% in halt for aeration and agitation stage;the removal rate of CODMn and NH3-N were 49.47% and 82.57% in latter aeration stage ; the removal rate of CODMn, and NH3-N were 38.42% and 97.86% in final water leakage.The second process is: instant influx water, aeration 13.5h, deposition 1.5h, instant exflux water, an entire period was 15h; aeration flux 0.2m3/h, temperature 27℃. The removal rate of CODMn, and NH3-N were above 40% and 97% .The orthogonal test was made on the first process to evaluate the effects of seven process conditions on CODMn, NH3-N removal efficiency, including aeration time, halt for aeration and agitation time, latter aeration time, deposition time, aeration flux, glucose concentration and ammonium chloride concentration. The result indicated: (1) Take the removal rate of CODMn, as object of study , The influence factor important order is: glucose concentration>aeration flux>halt for aeration and agitation time>ammonium chloride concentration>deposition time>latter aeration time>aeration time. The best technological conditions are: aeration 2h, halt for aeration and agitation 2.5h, latter aeration 1h, deposition 1.5h, aeration flux 0.4m3/h, glucose concentration 18mg/L and ammonium chloride concentration 11.2 mg/L. (2)Take the removal rate of NH3-N as object of study , The influence factor important order is: aeration time>ammonium chloride concentration > glucose concentration > deposition time > aeration flux > latter aeration time>halt for aeration and agitation time. The best technological conditions are: aeration 5h, halt for aeration and agitation 2.5h, latter aeration 1h, deposition 1.5h, aeration flux 0.7m3/h, glucose concentration 6 mg/L and ammonium chloride concentration 5.6 mg/L. The water from Lingming river was treated by SBBR.The results show that highest removal rate of CODMn, NH3-N and phenol was 91.41%,78.55%,97.83% and 75%, respectively.