混凝沉淀-UASB-BAF处理高浓度乳酸精馏残液实验研究

乳酸精馏残液是发酵法生产乳酸过程中产生的高浓度有机废水。原液CODcr浓度为1．08×10^6mg／L、BOD5浓度为4．8×10^5mg/L、SS浓度为3．6×10^5mg/L。将该废液稀释100倍，用混凝沉淀-UASB—BAF工艺处理，出水CODcr、BOD5、SS浓度、分别小于300mg/L、60mg/L、200mg/L。CODcr、BOD5、SS去除率可分别达到97％、98％、99％以上。出水达到《污水综合排放标准》（GB8978-1996）二级标准的要求。

The Study of Lactic Acid Distillation Residue Treatment by Using Technology of UASB and BAF

Lactic Acid Distillation Residue is a kind of organic wastewater with high concentration which yields during the process of lactic production. Its CODer concentration is 1.08 × 10^6 rag/L, BOD5 concentration is 4.8 × 105 mg/L and SS concentration is 3.6 × 105 mg/L. When the Lactic Acid Distillation Residue was diluted 100 times, and using the technology of Coagulation and precipitation-UASB reactor--BAF treat it. The effluent concentration of CODcr BOD5 , SS less than 300 mg/L,60 mg/L, and 200 mg/L respectively. The removal rate of CODcr BOD5 and SS can reach more than 97% ,98% ,99% respectively. The effluent water concentration can meet the request of second class standard of ＂Water discharge standard＂（GB8978-1996）.