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。
Abstract
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 was used. First, the oxidation capacity of ozone and potassium ferrate was compared. Based on the single-factor test, the response surface model was constructed based on the dosage of potassium ferrate, initial pH and slow stirring time, and the CODMn removal rate was the response value. Three independent factors and their interactions were analyzed to determine the optimal pre-oxidation process parameters. The results showed that: (1)Under the initial concentration of CODMn 8.00~10.00mg/L, ammonia nitrogen 1.3~1.5mg/L and turbidity 8.54~13.62NTU, the treatment effect of potassium ferrate on CODMn and turbidity of micro-polluted water was better than that of ozone treatment. However, the oxidation effect on ammonia nitrogen was poor. The synergy effect was better than that of potassium ferrate and ozone alone. When the dosage of potassium ferrate reached 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 reached 67.15%, 17.43%, and 61.71%, respectively.(2)Potassium ferrate dosage, initial pH, slow stirring time were the main influencing factors of this pre-oxidation treatment, the effect on CODMn removal rate: potassium ferrate dosage > initial pH > slow Stirring time. (3)The 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 was 72.96%. Under this condition, the actual effluent water CODMn 2.38~2.98 mg/L, which 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
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Key words
potassium ferrate /
ozone /
response surface /
rural micro-polluted water /
pre-oxidation
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