摘要
为了使出水COD和TN满足《城镇污水处理厂污染物排放标准》(GB 18918—2002)中一级A标准要求,宁波某化工园区污水厂升级改造项目拟采用反硝化生物滤池+臭氧催化氧化组合工艺。为了优化工艺参数,进行了规模为0.1~0.3 m3/h的中试。反硝化生物滤池工艺中试结果表明,当滤速为2~4 m/h、C/N比值为5~6时,对TN的去除率可达85%以上。臭氧催化氧化工艺中试结果表明,当臭氧投加量为65 mg/L、气液比为1.5∶1时,对COD的去除效果最好,可将进水COD由117 mg/L稳定降至40 mg/L以下。组合工艺连续运行结果表明,出水COD可稳定在40 mg/L以下、TN可稳定在5 mg/L以下,达到一级A排放标准。
In order to make COD and TN in the effluent meeting first grade A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002),a wastewater treatment plant in a chemical industrial park in Ningbo City was upgraded by using a combined process of denitrification biofilter and ozone catalytic oxidation.The pilot-scale test with treatment capacity of 0.1-0.3 m3/h was carried out to optimize the operational parameters.When filtration velocity was 2-4 m/h and C/N ratio was 5-6,the removal efficiency of TN in the denitrification biofilter could reach more than 85%.When dosage of ozone was 65 mg/L,and gas-liquid ratio was 1.5∶1,COD removal efficiency of the ozone catalytic oxidation process was the best,which could be stably decreased from 117 mg/L to less than 40 mg/L.COD and TN in the effluent of the combined process were always no more than 40 mg/L and 5 mg/L,respectively,which all met the first grade A discharge standard.
作者
姚通
余华东
郑元武
吴玉华
周杰
周俊杰
YAO Tong;YU Hua-dong;ZHENG Yuan-wu;WU Yu-hua;ZHOU Jie;ZHOU Jun-jie(Zhejiang Hi-Tech Environmental Technology Co.Ltd.,Hangzhou 310000,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2020年第19期72-76,共5页
China Water & Wastewater
关键词
化工园区废水
臭氧催化氧化
反硝化生物滤池
chemical industrial park wastewater
ozone catalytic oxidation
denitrification biofilter
