分置式-MBR处理生活污水的研究

Treatment of Wastewater with Recirculated Membrane Bioreactor

研究了分置式膜-生物反应器(RMBR)处理生活污水的工艺条件,讨论了膜面流速、添加粉末活性炭(PAC)等因素对临界膜通量、CODCr脱除率的影响。结果表明:在进水水质CODCr为286～596mg/L,NH3-N为14～50mg/L时,RMBR的出水水质达到CODCr<17mg/L(脱除率>97%),NH3-N<1.6mg/L(平均去除率>81%),浊度<0.2NTU;添加PAC后出水水质CODCr<3.88mg/L,临界循环比降低了10%～20%;对于已污染的膜,水反冲洗、碱浸泡后水反冲洗、碱浸泡+酸浸泡后水反冲洗可使膜通量恢复至新膜的39%,78%,91%。

The recirculated membrane bioreactor （RMBR） was used for treatment of municipal wastewater. The experimental results showed that the qualities of the effluent discharge treated by RMBR were as follows： CODCr〈15 mg/L, NH3-H〈1.53 mg/L, and turbidity〈0.2NTU at a waste water feed CODCr, of 286-596 mg/L and NH3-H of 14-50 mgCL. The membrane flux was enhanced with the increasing of crossflow velocity and powdered activated carbon （PAC）. The fouled membrane was cleaned by water rinsing, water/alkali rinsing, water/alkali/acid rinsing, and the recover ratio was 39%, 78%, 91% respectively.