高效菌种的厌氧-缺氧-膜生物反应器处理焦化废水

A^2O-MBR PROCESS TREATING COKING WASTEWATER WITH HIGH-EFFECTIVE BACTERIUM SPECIES

采用厌氧-缺氧-膜生物反应器(A2O-MBR)工艺处理焦化废水,并投入经固定化的高效菌种。采用MBR使污泥含量大为提高,污泥沉降比增大,故采用泥水回流,使MBR的泥水回到缺氧池。厌氧池采用具有蜂窝胞壁结构的纤维滤料。经过3个多月的试验表明,该工艺运行稳定,具有较好的适应能力和抗冲击能力。当进水COD和氨氮质量浓度分别为2000mg·L-1和150mg·L-1左右时,出水分别在120mg·L-1和9mg·L-1左右,去除率分别约为94%和93%,均达到GB8978-1996的一级标准要求。

The experiment on A^2-O-MBR process treating coking wastewater were performed by feeding fixed and high-effective bacterium species, the sludge concentration was greatly enhanced in MBR. The sludge reflux process is used because of the high SV. The sludge and wastewater back to the anoxic tank form the MBR. Cellular wall filling are used in anaerobic tank. Three months of continuous experiment indicated that the process has strong adapted ability to anti shock loading. Under the continuous influent, when the influent COD was about 2000 mg·L^-1, the effluent COD was about 120mg·L^-1; when influent NH4＋-N was about 150 mg·L^-1, the effluent NH4＋-N was about 9 mg·L^-1. The two indicators meet the criteria specified in integrated standard of wastewater discharge.