论文部分内容阅读
针对我国北方地区地下水硝酸盐超标问题,采用Box-Behnken响应曲面方法,分析温度为4～20℃时改性壳聚糖强化聚合氯化铝(PAC)处理硝酸盐的最优工艺.试验考察了改性壳聚糖投加量(X1)、聚合氯化铝投加量(X2)及温度(X3)3种因素对硝酸盐去除效果的影响规律,并建立了硝酸盐去除率与温度、药剂投加量的数学模型.结果表明:Box-Behnken响应面建立的数学模型对硝酸盐氮去除具有较高的拟合度,R2可达93.9％.当平均水温为4,12,20℃,改性壳聚糖与PAC投加量分别为2.3,22.5 mg/L时,改性壳聚糖强化混凝工艺对硝酸盐的去除效率分别为38％、62％、61％.“,”In order to solve the problem of excessive nitrate in groundwater in northern China,the Box-Behnken response surface methodology was used to analyze the optimal process for the treatment of nitrate with modified chitosan reinforced aluminum chloride at the temperature of 4 ～ 20 ℃.The effects of the dosage of modified chitosan (X1),the dosage of polyaluminium chloride (X2) and temperature (X3) on the removal efficiency of nitrate were investigated,and the mathematical model of nitrate removal rate with temperature,dosage of medicament was established.The results showed that the Box-Behnken model had high response surface fitting degree,which R2 reached 93.9％.When the average water temperature was 4,12,20 ℃ and dosage of modified chitosan and polyaluminium chloride was 2.3,22.5 mg/L,the removal efficiency of the modified chitosan enhanced coagulation process was 38％,62％ and 61％,respectively.