摘要
某医化园区各医化企业废水经企业内污水处理站处理达到纳管标准(COD浓度不超过500 mg/L)后排入下游污水处理厂。目前各企业排水COD_(Cr)浓度在200~450 mg/L之间,废水的BOD_(5)/COD_(Cr)只有0.1左右,可生化性较差,容易对下游污水处理厂造成影响。目的:在医化废水进入下游污水处理厂前,使医化废水COD_(Cr)达标。方法:采用生化+芬顿氧化+臭氧催化氧化+生物活性炭组合工艺对医化废水进行中试研究。中试进水COD_(Cr)浓度在206~284 mg/L之间,中试规模为0.5 m^(3)/h。分别考察生化、芬顿氧化、臭氧催化氧化和生物活性炭工艺对COD_(Cr)的处理效果和组合工艺的整体效果。结果:生化、芬顿氧化、臭氧催化氧化和生物活性炭工艺对COD_(Cr)的平均去除率分别为35%、47%、23%、34%,组合工艺的去除率为83%,出水COD_(Cr)浓度为36~47 mg/L,满足《城镇污水处理厂污染物排放标准》(GB 18918—2002)中一级A标准。结论:该组合工艺具有较好的耐负荷冲击能力,适于医化废水的处理。
The wastewater from various medical chemical enterprises in a medical and chemical park is treated by the internal sewage treatment station in the enterprise to reach the management standard(the concentration of COD is not more than 500 mg/L),and then discharged into the downstream sewage treatment plant.At present,the concentration of COD_(Cr) in the drainage of each enterprise is between 200 and 450 mg/L,and the BOD_(5)/COD_(Cr) of the wastewater is only about 0.1,which is poor in biodegradability and easy to affect the downstream sewage treatment plant.Objective:To make the medical and chemical wastewater reach the COD_(Cr) standard before it inters downstream sewage treatment plants.Methods:A pilot study was conducted on the treatment of medical and chemical wastewater using a combined process of biochemical+Fenton oxidation+ozone catalytic oxidation+biological activated carbon.The concentration of COD_(Cr) of the pilot influent was 206~284 mg/L,and the pilot scale was 0.5 m^(3)/h.The treatment effect of biochemical,Fenton oxidation,ozone catalytic oxidation and biological activated carbon on COD_(Cr) and the overall effect of the combined process were investigated respectively.Results:The average removal rates of COD_(Cr) by biochemical,Fenton oxidation,ozone catalytic oxidation and biological activated carbon processes were 35%,47%,23%and 34%,respectively,and the removal rates of combined processes were 83%.The effluent COD_(Cr) concentration was 36~47 mg/L,meeting the first-level A standard in the"Discharge Standards of Pollutant for Municipal Wastewater Treatment Plant"(GB 18918—2002).Conclusion:This combination process has good resistance to load impact and is suitable for the treatment of medical and chemical wastewater.
作者
贾中原
JIA Zhongyuan(Zhejiang Province Environmental Engineering Co.,Ltd.,Hangzhou,Zhejiang 310012,China)
出处
《浙江化工》
CAS
2024年第5期41-45,共5页
Zhejiang Chemical Industry
关键词
医化废水
生化
芬顿氧化
臭氧催化氧化
生物活性炭
medical and chemical wastewater
biochemical
Fenton oxidation
ozone catalytic oxidation
biological activated carbon
