粉煤灰/壳聚糖复合材料处理高浊水的研究

Study on treatment of highly turbid water in ceramic industry with fly ash/chitosan composite

为解决高浊水除浊问题,使用酸改性粉煤灰与壳聚糖按照不同质量比制备成的复合材料对高浊水进行处理。通过单因素实验和正交试验得出了粉煤灰与壳聚糖复合材料投加量、搅拌时间、pH和废水初始浊度对除浊性能的影响以及各因素综合作用对除浊率的影响。单因素实验结果表明:当粉煤灰与壳聚糖质量比为6:1时,其除浊率可达到93.78%;当复合材料CWF3投加量为0.6 g时,其除浊率可达到73.52%;当搅拌时间为30 min时,其除浊率可达到90.28%;当pH=6时,其除浊率可达到84.50%;当初始浊度为300 NTU时,其除浊率可达到95.67%。正交试验结果表明,当粉煤灰与壳聚糖质量比为6:1,最佳组合条件为投加量0.7 g、搅拌时间35 min、废水初始pH=7、废水初始浊度350 NTU。酸改性粉煤灰负载壳聚糖后具有更强的亲和能力,且价格便宜,可以弥补单独使用粉煤灰或壳聚糖的不足,可用于对大规模废水进行处理。

To solve the problem of turbidity removal from highly turbid water,this study uses composite materials prepared by acid-modified fly ash and chitosan with different mass ratios to treat highly turbid water.The effects of amount of fly ash and chitosan composite materials,stirring time,pH,and initial turbidity on the turbidity removal performance and the combined effects of various other factors were studied through single-factor experiments and orthogonal experiments.The single-factor experiment results show that when the mass ratio of fly ash to chitosan is 6:1,the turbidity removal rate can reach 93.78%;when the composite material CWF3 dosage is 0.6 g,the turbidity removal rate can reach 73.52%;when the stirring time is 30 min,the turbidity removal rate can reach 90.28%;when pH=6,the turbidity removal rate can reach 84.50%;when the initial turbidity is 300 NTU,the turbidity removal rate can reach 95.67%.The orthogonal experiment results show that when the mass ratio of fly ash to chitosan is 6:1 and the optimal combination includes a dosage of 0.7 g,stirring time of 35 min,initial wastewater pH of 7,and initial wastewater turbidity of 350 NTU.Adding chitosan to acid-modified fly ash will strengthen the affinity and lower the cost.It can compensate for the shortcomings of using fly ash or chitosan alone and benefit large-scale wastewater treatment.