Submerged membrane bioreactor:A quick treatment technology for non-fecal domestic sewage.

Aiming at the relative complexity of conventional domestic sewage water and the difficulties in treating and recycling this kind of water,an advanced treatment of domestic wastewater drained from kitchen,shower,and rinse but not from lavatory was processed. By adjusting the hydraulic retention time(HRT) and the aeration amount of submerged membrane bioreactor(SMBR) ,a set of feasible option of technical parameters was determined to keep the system in steady-state. When the treatment was conducted under the optimum operation conditions of HRT 80 minute and air/water ratio 12-15,MLSS 7000-9100 mg·L-1,and solid retention time(SRT) about 40-55 d,the removal rate of COD,NH+4-N,and total P was 85.5%,53.1%,and 44.9%,and the COD,BOD5,NH+4-N,total P,and LAS of effluent water were 20-30 mg·L-1,1-5 mg·L-1,2-3.08 mg·L-1,0.59-0.9 mg·L-1,and 0.41-0.67 mg·L-1,respectively,meeting the National Standards for Recycling(GB/T 18920-2002) .