Co、Ni元素对工业废水混合厌氧发酵性能影响

Effect of Co and Ni on anaerobic fermentative performance of mixed industrial wastewater

以制药废水和味精废液混合废水作为发酵底物,着重考察Co、Ni元素对厌氧发酵系统运行性能的影响.运行数据表明,在混合废水C/N比为26.5下,厌氧发酵性能较制药废水和味精废液单独发酵可有效提高.当添加Co、Ni元素时,系统日甲烷产量、累积甲烷产量、比甲烷产量和COD去除率较混合废水组均得到有效提高.对于添加Co元素的实验组,当Co2+质量浓度为0.5 mg·L^-1时,日甲烷产量、累积甲烷产量、产甲烷比率和COD去除率均达到最大值,分别为(1058±33)mL·d^-1、43 645 mL、(356.7±2.6)mL·g^-1COD和(87.6±3.5)%.对于添加Ni元素的实验组,当Ni2+质量浓度为1.0 mg·L^-1时,日甲烷产量、累积甲烷产量、产甲烷比率和COD去除率均达到最大值,分别为(1450±19)mL·d^-1、55 975 mL、(423±2.9)mL·g^-1COD和(89.7±3.5)%.

The effects of Co and Ni on performance of anaerobic fermentation system were emphatically investigated using pharmaceutical wastewater and monosodium glutamate wastewater as substrate in this paper. The anaerobic fermentative performance could be/N ratio of mixed wastewater,compared to that of pharmaceutical wastewater and monosodium glutamate wastewater as sole substrate. The daily methane production,cumulative methane production,methane yield and COD removal rate were all improved effectively with addition of Co and Ni. For experiment group with Co addition,when Co2+concentration was 0. 5 mg·L^-1,the maximum daily methane production,cumulative methane production,methane yield and COD removal rate were determined to be(1 058±33)mL·d^-1,43 645 mL,(356.7±2.6)mL·g^-1 COD and(87.6±3.5)%,respectively. For experiment group with Ni addition,when Ni^2+concentration was1.0 mg·L^-1,the maximum daily methane production,cumulative methane production,methane yield and COD removal rate were determined to be(1 450±19)mL·d^-1,55 975 mL,(423±2.9)mL·g^-1 COD and(89.7±3.5)%,respectively.