针对榨菜废水呈高盐、高有机物浓度的水质特征,对UASB-好氧-混凝工艺处理采用盐脱水工艺所产生的榨菜废水的效能进行了研究.试验结果表明,UASB的最佳反应条件是:盐质量浓度(以NaCl计)不超过46g/L,有机负荷不超过15.0 kg//(m3·d),温度38℃,pH在6.8～7.2;而在兼性氧化反应器和好氧接触氧化反应器中,DO保持在＞4mg/L,HRT控制在20～24 h时,COD的去除率最高;在混凝过程中,当聚合氯化铝(PAC)投加质量浓度为200mg/L时,pH在6.4～7.8,出水的COD最低.经UASB-好氧-混凝工艺处理后,三个工艺段废水COD的去除率分别为45%、60%、61.7%,出水COD约为78 mg/L,总去除率＞90%,达到<污水综合排放标准>(GB 8978-1996)一级标准.%The mustard tuber wastewater is characterized by high salinity and high organic matter concentration.The efficiency of using UASB-aerobic-coagulation process for treating mustard tuber wastewater from the desalting technology has been studied. The results show that the best reaction conditions of UASB are as follows: the salt mass concentration (calculated as NaCl) is lower than 46 g/L,the organic loading not higher than 15.0 kg/(m3·d),temperature 38 ℃ and pH 6.8-7.2. The removal rate is the highest,when it is in the facultative oxidation reactor and aerobic-contact oxidation reactor, DO is ＞4 mg/L, and HRT is 20-24 h. The COD of effluent water is the lowest,during the process of coagulation,when the mass concentration of PAC dosage is 200 mg/L,and pH 6.4-7.8. After treated by the UASB-aerobic-coagulation process, the wastewater COD removal rates of the three units are 45％,60％ ,and 61.7％ ,respectively,the effluent COD is about 78 mg/L,and the total removal rate is higher than 90％,meeting the firstclass of Integrated Standard of Wastewater Discharge (GB 8978-1996).
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