利用氢基质生物膜反应器去除水中砷酸盐  

Removal of soluble arsenate using hydrogen-based membrane biofilm reactor

作　　者：潘思宇[1] 夏四清[1] 王晨辉[1] 沈双[1] 

机构地区：[1]同济大学环境科学与工程学院污染控制与资源化研究国家重点实验室,上海200092

出　　处：《环境科学学报》2015年第12期3781-3788,共8页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.51378368)~~

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^(-1)SO_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.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.

关 键 词：氢基质生物膜反应器 砷酸盐 影响因素 

分 类 号：X703.1[环境科学与工程—环境工程]