人工湿地基质在污水净化中的选择与再生研究

Selection and Regeneration of Constructed Wetland Substrate in Wastewater Purification

通过吸附和吸附再生2个阶段的试验,探究了不同人工湿地基质对污染物的去除效果和持续吸附能力,结果显示:在同一吸附阶段,不同的单一基质对氨氮、TP、COD的去除程度均不同,麦饭石对氨氮的吸附率最高为61.81%,陶粒对TP的吸附率最高为83.63%,珍珠岩、沸石对COD的吸附率最高均可达100.00%;混合基质麦饭石+珍珠岩/火山石组合的吸附效果均得到增强,但吸附饱和点提前。在吸附再生阶段,单一基质在5 d内达到最大吸附量的时间平均为1~2 d;各基质对污染物的吸附能力明显下降,麦饭石对氨氮的吸附率最大值仅为18.08%,混合基质麦饭石+火山石组合对氨氮、COD多为释放状态,但麦饭石+珍珠岩组合恢复对COD的持续吸附作用。因此,基质种类及其再生效果对人工湿地污水的持续性处理至关重要。

The contaminants removal effect and sustained adsorption capacity of constructed wetlands substrates were explored through two stages of adsorption and adsorption regeneration experiments.The results showed that different substrates had different degrees of ammonia nitrogen,TP,and COD removal in the adsorption stage.The adsorption of ammonia nitrogen by Wheatstone could reach 61.81%,that of TP by ceramic granules could get 83.63%,and that of COD by perlite and zeolite could reach 100.00%.The adsorption of mixed substrate wheatstone+volcanic stone was enhanced.The average time of the maximum adsorption capacity of single substrate in the adsorption regeneration stage within 5 d was 1~2 d,and the adsorption capacity of pollutants decreased significantly.The maximum value of ammonia nitrogen adsorption by wheatstone was only 18.08%,and In the adsorption and regeneration stage,the ammonia nitrogen and COD were mostly released by mixed substrate wheatstone+volcanic stone,but the sustained adsorption of COD was restored by mixed substrate wheatstone+volcanic stone.Therefore,substrates selection and regeneration are crucial for the sustainable treatment of constructed wetland effluent.