中文摘要：

利用氢基质生物膜反应器（Hydrogen-based membrane biofilm reactor,MBfR）研究了NO_3^--N负荷、SO_4^2-负荷、As（Ⅴ）负荷、氢分压对水中砷去除效果的影响.结果表明,随着NO_3^--N进水负荷的增加,As（Ⅴ）和SO_4^2-还原受到明显抑制,系统产生As（Ⅲ）和NO_2^-的积累;随着SO_4^2-进水负荷的增加,反应器内总砷去除率由78.6%（25 mg·L-1SO_4^2-降低至1.1%（200 mg·L^-1SO_4^2-,而此时NO_3^--N的去除基本不受影响.同时,随着进水As（Ⅴ）负荷从0.25 mg·L^-1增至2 mg·L^-1,出水SO_4^2-浓度明显升高,反应器内总砷去除率从70.0%降低至47.3%,而此时NO_3^--N的去除基本不受影响;当氢分压低于0.06 MPa时,提高氢分压可降低出水As（Ⅴ）浓度,当氢分压高于0.06 MPa后便不再是控制因素.由于体系中氢自养还原微生物会优先利用NO_3^--N和SO_4^2-作为电子受体,因此,为了保证As（Ⅴ）的高效还原去除,必须控制氢分压在0.05~0.07 MPa之间.

英文摘要：

A continuous stirred hydrogen-based membrane biofilm reactor （MBfR） was used to study the effects of influent concentration of NO3--N, SO42- ,As（ V ） and H2 pressure for the removal of As（ V ） in water. The results demonstrated that As（ V ） and SO24- reduction was inhibited by the increase of NO3-N influent concentration. NO2- began to accumulate at the NO3-N concentration of 20 mg. L-1 and As（ m ） was accumulated because of the shortage of S2-. When influent NO-3-N concentration was higher than 50 mg. L-1, the total As removal rate was nearly zero. As（ V ） and SO2-4- reduction was suppressed with the increase of SO2-4- concentration, and total As removal efficiency decreased from 78.6% （ influent SO2-4- 25 mg. L-1 ） to 1.1% （influent SO2-4- 200 mg. L-1）. As（ V ） concentration had a great influence on As（ V ） and SO2-4- reduction rates. Total As removal efficiency decreased from 70.0% （influent As（ V ） 0.25 mg. L-1 ） to 47.3% （influent As （ V ） 2 mg. L-1 ）. Higher H2 pressure, no more than 0.06 MPa, would increase As（ V ） reduction flux. As（ V ） removal would be insensitive to H2 pressure. But the reduction of NO-3-N and SO2- compete more strongly for electron donor （ H2 ） than As（ V ）. In order to keep high removal efficiency of total As, H2 pressure should be controlled in the range of 0.05 - 0.07 MPa.