生物接触氧化与兼氧水解—Bardenpho脱氮工艺应用于农用抗生素废水处理的比较分析

Comparison of contact oxidation and integrated facultative hydrolysis-Bardenpho denitrification in treating an agricultural antibiotic wastewater

农用抗生素废水不仅有机物、氨氮、SS和盐分含量高,还含有不可降解的结构复杂的有机物、发酵中间代谢产物及抗生素,属高浓度难降解有机废水。对浙江钱江生物化学股份有限公司的农用抗生素废水一、二期工程的水质特点、工艺流程、运行情况和技术经济进行了比较分析,结果表明:采用单级生物接触氧化为主的处理工艺,生化残余浓度高,达标困难;采用兼氧水解—Bar-denpho脱氮工艺处理,不仅能有效降低生化残余浓度,且系统对COD和氨氮的去除率分别达到98%和99%以上,且运行费用降低40%,获得的社会效益和环境效益较显著。

The case history of treating an agricultural antibiotic wastewater containing large amounts of organic compounds,NH3-N,SS aInd salt is presented. The performance data of the 400 m^3/d Phase Ⅰ wastewater treatment system of contact oxidation and the 1 000 m^3/d Phase Ⅱ system of facultative hydrolysis followed the four-stage A2O2 （Bardenpho） denitrification are reviewed and compared. Because of the presence of many persistent organic compounds in the wastewater, the contact oxidation treatment was far less effective than the integrated hydrolysis and denitrification treatment,which consistently accomplished excellent removal of COD （up to 98%） and NH3-N （up to 99% ）. The highly effective, low cost integrated hydrolysis and denitrification process will likely find many other applications to realize its significant social and environmental benefits.