榨菜废水常温两相厌氧生物处理工艺的调试

Commissioning of Two-phase Anaerobic Biological Process for Treatment of Mustard Tuber Production Wastewater at Ambient Temperature

榨菜废水常温两相厌氧处理工艺的调试具有高盐、常温厌氧启动难等不利条件。重庆某榨菜废水处理采用水解酸化／／L氧接触氧化工艺，通过控制厌氧单元的pH值、驯化厌氧耐盐微生物、观察和分析厌氧接触池生物膜与产甲烷菌属、灵活调整两相厌氧反应器功能等方法，探讨了在进水COD浓度偏低的条件下，常温两相厌氧系统达到稳定运行的技术途径。调试结果表明，保持水解酸化池和厌氧接触池的pH值分别为（6．5～7．5）和（6．8～7．4）、容积负荷分别为1．31和0．17kgCOD／（m。·d）、盐度（以NaCl计）为1％左右，可使系统运行稳定，对COD的去除率约为75％．

High salinity and difficult start-up are common problems faced by commissioning of two- phase anaerobic biological process for treating mustard tuber production wastewater at ambient tempera- ture. The hydrolysis acidification/anaerobic contact oxidation process was applied to wastewater treatment in a mustard tuber production plant in Chongqing. Several approaches, such as controlling the pH of an- aerobic unit, domesticating anaerobic salt-tolerant microbes, analyzing biofilm and methanogens in anae- robic contact reactor and adjusting the function of two-phase anaerobic reactor, were investigated to a- chieve stable operation under low influent COD concentration. The commissioning results showed that the two-phase anaerobic biological process at ambient temperature could be operated stably, and the removal rate of COD was around 75% when pH and volumetric load of the hydrolysis acidification reactor were 6.5 to 7.5 and 1.31 kgCOD/（ m3 . d）. Those of the anaerobic contact reactor were 6.8 to 7.4 and 0.17 kgCOD/（m3 . d） respectively, and the salinity was about 1% （measured by NaC1）.