响应面法优化高铁酸钾-臭氧预氧化西北农村微污染水  

Response Surface Methodology for the Optimization of Potassium Ferrate-Ozone Pre-oxidation of Micro-polluted Water in Rural Areas in Northwest China

作　　者：郭可欢 张文莉 李杰[1] 王亚娥[1] GUO Ke-huan;ZHANG Wen-li;LI Jie;WANG Ya-e(School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China)

机构地区：[1]兰州交通大学环境与市政工程学院,兰州730070

出　　处：《中国农村水利水电》2020年第12期139-143,共5页China Rural Water and Hydropower

基　　金：西部典型缺水地区农村供水排水一体化技术及应用示范(2016YFC0400705);甘肃典型缺水地区农村饮水处理技术及系列设备研发(18YF1FA010)。

摘　　要：为了对西北农村地区微污染饮用水源水进行预处理,采用了高铁酸钾-臭氧预氧化工艺,首先比较了臭氧、高铁酸钾氧化能力的大小。在单因素试验基础上,以高铁酸钾投加量、初始pH、慢速搅拌时间为考察因素,CODMn去除率为响应值构建了响应曲面模型,分析了3个独立因素及各因素间相互作用,确定了最佳预氧化工艺参数。结果表明:①在初始浓度CODMn8.00~10.00 mg/L、氨氮1.3~1.5 mg/L及浊度8.54~13.62 NTU进水条件下,高铁酸钾对微污染水CODMn和浊度的处理效果好于臭氧处理,对氨氮的氧化效果较差。二者协同作用要好于单独高铁酸钾及臭氧的处理效果,高铁酸钾投加量达11.5 mg/L、臭氧投加量6mg/L时,体系CODMn、氨氮及浊度去除率分别达67.15%、17.43%、61.71%。②高铁酸钾投加量、初始pH、慢速搅拌时间为高铁酸钾-臭氧预氧化处理的主要影响因素,对CODMn去除率的影响大小排序:高铁酸钾投加量>初始pH>慢速搅拌时间。③最佳预氧化工艺参数:高铁酸钾投加量11.75 mg/L、初始pH 7.74、慢速搅拌时间42.72 min,微污染水CODMn去除率为72.96%。该条件下,实际运行出水CODMn 2.38~2.98 mg/L,以此证明高铁酸钾-臭氧预氧化工艺是有效的。In order to pre-treat the slightly polluted drinking water source water in the rural areas of northwest China,the potassium ferrate-ozone pre-oxidation process is used.First,the oxidation capacity of ozone and potassium ferrate is compared.Based on the single-factor test,the response surface model is constructed based on the dosage of potassium ferrate,initial pH and slow stirring time,and the CODMn removal rate is the response value.Three independent factors and their interactions are analyzed to determine the optimal pre-oxidation process parameters.The results show that:①Under the initial concentration of CODMn 8.00~10.00 mg/L,ammonia nitrogen 1.3~1.5 mg/L and turbidity 8.54~13.62 NTU,the treatment effect of potassium ferrate on CODMn and turbidity of micro-polluted water is better than that of ozone treatment.However,the oxidation effect on ammonia nitrogen is poor.The synergy effect is better than that of potassium ferrate and ozone alone.When the dosage of potassium ferrate reaches 11.5 mg/L and the dosage of ozone was 6 mg/L,the removal rates of CODMn,ammonia nitrogen and turbidity of the system reaches 67.15%,17.43%,and 61.71%,respectively.②Potassium ferrate dosage,initial pH,slow stirring time are the main influencing factors of this pre-oxidation treatment,the effect on CODMn removal rate:potassium ferrate dosage>initial pH>slow Stirring time.③The best pre-oxidation process parameters:potassium ferrate dosage of 11.75 mg/L,initial pH of 7.74,slow stirring time of 42.72 min,and the CODMn removal rate is 72.96%.Under this condition,the actual effluent water CODMn 2.38~2.98 mg/L proves that the potassium ferrate-ozone pre-oxidation process is effective.

关 键 词：高铁酸钾 臭氧 响应面 农村微污染水 预氧化 

分 类 号：TV52[水利工程—水利水电工程] TU991.2[建筑科学—市政工程]