文献类型：期刊文献

英文题名：Effect of sulfate on anaerobic degradation of benzoate in UASB reactors

作者：Fang, HHP; Liu, Y; Chen, T

机构：[1]E CHINA UNIV SCI TECHNOL,DEPT ENVIRONM ENGN,SHANGHAI,PEOPLES R CHINA;[2]FAR E LANDFILL TECHNOL LTD,HONG KONG,HONG KONG

年份：1997

卷号：123

期号：4

起止页码：320

外文期刊名：JOURNAL OF ENVIRONMENTAL ENGINEERING

收录：;WOS:【SCI-EXPANDED(收录号:WOS:A1997WQ01700004)】；

语种：英文

摘要：Wastewaters containing benzoate and sulfate were treated in two upflow anaerobic sludge blanket (UASB) reactors at 34-37 degrees C for 320 d. The sulfate concentration was increased stepwise in Reactor-A up to 7,500 mg/L, and was kept mostly constant at 3,000 mg/L in Reactor-B. Both reactors removed over 98% of organic chemical-oxygen demand (COD) for sulfate up to 6,000 mg/L, despite the fact that the mixed liquor contained up to 769 mg S/L of total sulfides and up to 234 mg S/L of dissolved H2S. Sulfate-reducing efficiency decreased with the increase in sulfate concentration, but increased with time at each sulfate concentration. Reactor-B consistently reduced 89% of sulfate. However, both organic COD removal and sulfate-reducing efficiencies of Reactor-A dropped drastically at 7,500 mg SO42-/L, and showed no sign of recovery after 50 d. The system failure was likely due to the increased sulfate, instead of sulfide, toxicity. From the COD balance, 93.4% of COD removed was converted to methane instead of sulfides, with a net sludge yield of 0.047 g volatile suspended solids (VSS)/g COD. The sulfur balance was over 97%.