多段多相生化工艺处理难降解有机废水试验研究

MULTI-STAGE AND MULTI-PHASE BIOCHEMICAL PROCESS FOR TREATMENT OF REFRACTORY ORGANIC WASTEWATER

采用2相厌氧-2段好氧工艺处理高含量难降解有机废水试验。结果表明,该工艺对COD去除效果较好,当进水COD平均为7.291 g/L,出水平均为0.067 3 g/L,平均去除率高于98%。酸化阶段、产甲烷阶段、一段好氧、二段好氧阶段各自发挥了不同作用,对COD去除贡献率差异较大。酸化阶段去除贡献率较小,为产甲烷阶段的高贡献率创造了条件;产甲烷阶段去除贡献率最高;二段好氧阶段去除贡献率虽低,但进一步保障了出水水质。

Multi-stage and multi-phase biochemical process was used for the treatment of high concentration refractory organic wastewater. The results show that, the process takes a great effect on COD removal. Average COD concentration in effluent is 0.067 3 g/L when average COD concentration in influent is 7.291 g/L with an average removal rate higher than 98%. Acidogenic reactor, methanogenic reactor, the first stage aerobic reactor and the second stage aerobic reactor play different roles respectively, which make contribution rates of COD removal by each stage different obviously. Lower contribution rate in acidogenic reactor provides conditions for methanogenic reactor with a higher contribution rate. Maximum contribution rate appears in methanogenic reactor while minimum appears in the second stage aerobic reactor which purifies wastewater furthermore.