饮用水处理厂锰砂滤料对苯酚的吸附性能及影响因素

为了解锰砂滤料对苯酚的吸附性能和影响因素,以生物锰砂滤池运行结束后产生的废料为吸附剂,研究了不同初始pH、温度和溶解氧条件下锰砂滤料对苯酚的吸附性能,通过吸附动力学模型和吸附等温线模型研究其吸附规律。结果表明:锰砂滤料对苯酚的吸附过程符合内扩散动力学模型和Temkin吸附等温线模型,每单分子层吸附,吸附效果主要受苯酚扩散速率影响。通过对吸附等温线n值的计算发现,锰砂滤料容易吸附苯酚。pH对锰砂滤料去除苯酚的影响最大,初始pH为3.0时,苯酚可完全去除,随着初始pH的升高,苯酚的去除率逐渐减小。中性条件下,溶解氧浓度对苯酚的吸附作用影响不大,低温时可通过增加锰砂滤料投加量提高苯酚去除率,每增加1.5倍锰砂滤料,苯酚去除率约增加20个百分点。锰砂滤料可应用于地下水中的苯酚去除,达到废料再利用,不产生二次污染。

Adsorption performance and influencing factors of manganese sand filter media on phenol removal in drinking water treatment plant

In order to understand the adsorption performance and influencing factors of manganese sand filter material on phenol, the waste material produced after the operation of biological manganese sand filter was used as adsorbent. The adsorption performance of manganese sand filter material on phenol under different pH, temperature and dissolved oxygen conditions was studied respectively. The adsorption law of manganese sand filter material was studied by adsorption kinetic model and adsorption isotherm model. The results showed that the adsorption process of manganese sand media for phenol was in accordance with the internal diffusion kinetic model and Temkin isothermal adsorption model, being the monolayer adsorption. The adsorption effect was mainly affected by the diffusion rate of phenol. Through the calculation of n value of adsorption isotherm, it is found that manganese sand filter material is easy to adsorb phenol. The pH had the greatest effect on the removal of phenol from manganese sand filter. When pH=3.0, phenol could be removed completely. The removal rate of phenol decreased gradually with the increase of pH. The effect of hypoxia on phenol adsorption was not significant under neutral condition. The removal rate of phenol was increased by increasing the dosage of manganese sand filter material under low temperature condition. The removal rate of phenol was increased 20 percent for every 1.5 times of manganese sand filter material. When that manganese sand filter material is applied to remove phenol from the underground water, the method should achieve the good effect of recycling waste and repairing phenol pollute water body, does not generate secondary pollution phenomenon, and has good application prospects.