物化-生化组合工艺处理皂素废水

TREATMENT OF SAPONIN WASTEWATER BY PHYSICOCHEMICAL AND BIOCHEMICAL PROCESS

皂素废水CODCr高、pH低、色度高以及可生化性差,很难被常规生物处理系统降解。本文介绍了采用物化+生化工艺处理皂素废水的工程实例。在废水中的CODCr、BOD5、色度、SS分别为2 32 5 0mg L、36 0 0mg L、2 16倍、2 6 0mg L的条件下,经过处理后,出水CODCr、BOD5、色度、SS分别为92mg L、2 0mg L、2 0倍、2 7mg L ,均可达到《污水综合排放标准》中的一级标准,废水中CODCr、BOD5、色度、SS的平均去除率分别为99. 6 %、99. 4 %、90 . 7%、90 . 4 %。

The saponin wastewater is characterized by a strong dark color,high chemical oxygen demand (COD) concentration,low pH value and low biodegradability.Treatment of this wastewater by traditional activated sludge method is essentially impossible.In the present work, combined physical,chemical and biological methods were synergistically utilize to tackle the wastewater.The results show that COD_ Cr ,BOD_5,chromaticity and SS can be reduced respectively from 23 250 mg/L , 3 600 mg/L ,216 times and 260 mg/L to 92 mg/L,20 mg/L,20 times and 27 mg/L by the process, and their average removal rates are 99.7%,99.4%,90.7% and 90.4% respectively,which can meet the first-order of “Overall Sewage Discharge Standards”(GB8978-1996).