强化垂直流可渗透反应墙处理渗滤液污染物

针对垃圾渗滤液污染物组分多、处理难度大、可生化性差的特点,基于可渗透反应墙(PRB)被动修复技术,通过多种填料的组合构建三重垂直流PRB强化的砂箱模型,对垃圾渗滤液进行连续动态处理研究。实验结果表明,填料的组合顺序对强化PRB系统净化能力有较大的影响,由无烟煤、沸石、钢渣依次组成的强化垂直流PRB系统(2#砂箱)对NH4+-N、NO3--N、NO2--N、COD、PO43--P的平均去除率分别为96.12%、30.36%、75.24%、39.03%和30.47%,处理效果明显好于相同条件下依次由无烟煤、钢渣、沸石组成的强化垂直流PRB系统(1#砂箱)。与常规PRB处理系统相比,强化垂直流可渗透反应墙系统可实现垃圾渗滤液中多种污染物同步有效去除,是极具发展潜力的新型技术。

Treatment of leachate pollutants by enhanced vertical flow permeable reactive barrier

Aimed at the characteristics of the complex composition, difficult disposal and low biochemical degradation of leachate, based on passive remediation technology of permeable reactive barrier (PRB), the three-fold sand box models of enhanced vertical flow PRB were built by combinations of multi-fillers to study treatment of leachate continuously and dynamically. The results showed that the combinations and sequences of fillers had a great influence on the purification capacity of enhanced PRB system. The enhanced vertical flow PRB system (sand box model 2) was composed by anthracite, zeolite and slag. Its average removal rates of NH4+-N, NO3--N, NO2--N, COD and PO43--P were 96.12%, 30.36%, 75.24%, 39.03% and 30.47%, respectively. The treatment effect was obviously better than that of the enhanced vertical flow PRB system (sand box model 1) composed by anthracite, slag and zeolite in sequence under the same conditions. Compared with routine PRB treating system, the enhanced vertical flow PRB system can remove multi-pollutants of leachate effectively and simultaneously. Therefore, it is a promising new technique.