柠檬酸有机废水的生化处理研究

Study on the Biological Treatment of Oganic Wastewater Containing Citric Acid.

采用柠檬酸废水→培养饲料酵母→可溶化槽→光合细菌(PSB)槽→活性污泥工艺流程处理柠檬酸废水,实验结果表明,技术可行:原废水中COD_(Cr)和BOD_5的总去除率达98％以上,达国家GB8978-88排放标准;干酵母获得率1.0-1.2％,蛋白质含量46.58％;COD_(Cr)负荷达6kg/(m^3.d);TVA利用率达95％以上.本实验还筛选到对高浓度有机废水具较高同化能力的PSB混合菌种.

A stream of wastewater from citric acid production process was treated by using a biological process of the following steps: wastewater from citric acid neutralization→cultivating feed yeast→solubles tank→photosynthetic bac-teria(PSB) tank→activated sludge tank. The results from the treatment experiments show that the process is technically feasible. The overall removal of CODcr and BODs from raw wastewater was as high as more than 98%, and their levels in effluent are in compljance with the national standards for wastewater dis- charge under GB8978-88. The yield of dry yeast from the treatment process is 1.0- 1.2%, with a protein content of 46.58%. CODcr load of 6kg/(m3.d)can be treated. The rate of TVA utilized exceeds 95%. The mixed PSB species have been also screened, wich have higher ability of assimilating an organic wastewater of high concentration.