水滑石/超滤工艺处理微污染水中有机污染物的试验研究

Experimental Study on Treatment of Organic Pollutants in Micro-Polluted Water by Hydrotalcite/Ultrafiltration Process

为了提高微污染水中有机污染物的处理效果,提高饮用水品质,本实验采用水滑石/超滤组合工艺对模拟水样进行处理,考察在水滑石投加量,吸附时间,超滤反冲洗水量变化的条件下,组合工艺对TOC和UV_(254)处理效果的影响,并对实验结果进行分析。在单因素实验的基础上,通过响应面法对TOC的去除条件进行优化,结果表明:三因素的交互作用对TOC去除效果影响显著性排序为:吸附剂量&吸附时间>吸附时间&反冲洗水量>吸附剂量&反冲洗水量,在吸附剂量为393.77 mg/L、吸附时间为37.16 min、反冲洗水量为153.42 L/h时,TOC的去除率达到最高的76.41%,并在此条件下,测得组合工艺对其他污染指标的去除率分别为:浊度97.60%,氨氮71.25%,Cr(Ⅵ)93.41%,Mn(Ⅱ)33.33%。该研究可以为将来超滤膜的使用提供一定的理论依据,为饮用水的处理提供新思路。

In order to improve the treatment effect of organic pollutants in micro-polluted water and improve the quality of drinking water,this experiment used hydrotalcite/ultrafiltration combined process to treat simulated water samples.The effects of the combined process on TOC and UV_(254) treatment were investigated under the conditions of hydrotalcite dosage,adsorption time and ultrafiltration backwash water volume change,and the experimental results were analyzed.On the basis of single-factor experiments,the removal conditions of TOC were optimized by the response surface method.The results showed that the significant order of the interaction of three factors on the removal effect of TOC was:adsorbent dose&adsorption time>adsorption time&backwash water>adsorbent dose&backwash water.When the adsorbent dose was 393.77 mg/L,the adsorption time was 37.16 min,and the backwash water was 153.42 L/h,the removal rate of TOC reached the highest of 76.41%.Under this condition,the removal rates of other pollution indicators measured by the combined process were:turbidity of 97.60%.Ammonia nitrogen of 71.25%,Cr(VI)of 93.41%,Mn(II)of 33.33%.This study can provide a theoretical basis for the future use of ultrafiltration membranes and provide new ideas for the treatment of drinking water.