O_3及O_3+AC一体化工艺深度处理印染废水对比研究

Comparative Study on the Advanced Treatment of Printing & Dyeing Wastewater by O_3 and O_3+AC Integrative Process

本文以印染废水二沉池的出水为研究对象,采用臭氧、臭氧+活性炭等工艺对其进行深度处理研究。对比发现,经过单独臭氧处理后,COD值去除率不足30%,且色度较高,而加入活性炭后处理效果明显改善。对活性炭加入量、活性炭预处理程度、pH值以及废水在反应器中的总停留时间等因素进行研究,结果表明:初始COD值在300~400 mg/L、pH值7.5、色度500倍的二沉池出水,在不调节pH值的情况下,按照活性炭投加量5 g/L与臭氧同时加入,在臭氧预处理15 min(浓度约4 mg/L),总水力停留5 h后,出水COD值稳定在100 mg/L以内,色度低于100倍,满足印染废水排放标准的二级排放要求。

In this paper, ozone and ozone＋active carbon integrative process are used to treat sedimentation discharge in printing and dyeing enterprise. The removal rate of COD is less than 30% through ozone process, and the chroma is still high. The effects of O3＋AC integrative process, by contrast, are much better. The influence of dosage and saturation of active carbon, pH value and hydraulic retention time （HRT） are studied. The results show that COD of the effluent reduces from 300 - 400 mg/L to less than 100 mg/L and chroma reduces from 500 times higher to less than 100 times higher, under the condition ofAC 5 g/L, ozone pretreated 15 minutes and HRT 5 h. The quality of the effluent can meet the second grade discharge standard tbr dyeing and finishing of textile industry.