不同组合垂直潜流式人工湿地对高碳或氮污水的净化效果

4种组合的垂直潜流式人工湿地在高C和高N污染物负荷条件下都可以得到很好的污染物降解效果.VDFVUF湿地组合被确定为最优的组合,它在夏末(7月和8月)和初秋(9月)可以得到较高的污染物去除率,且在8月份可以达到最大值.VDF-VUF湿地组合对于COD、TN和TP去除率的平均值在高C污染物负荷条件下分别为(96.97 ±6.32)％、(89.45 ±5.29)％和(83.12±6.03)％;在高N污染物负荷条件下分别为(93.21±7.84)％、(94.27±4.36)％和(82.36±5.52)％.各种人工湿地组合的COD和TN的去除率都受到了季节变化、湿地组合类型以及这两者的综合效应的显著影响;但是TP的去除率则不受任何因素的显著影响.

Effects of various combinations of vertical-subsurface flow constructed wetlands on various influent high carbon or nitrogen loading wastewaters

Four kinds of two-stage combinations vertical up-flow (VUF) and vertical down-flow (VDF) vertical-subsurface flow constructed wetlands (VFCWs) can achieve high nutrient removal efficiencies under high carbon and nitrogen loading conditions. The optimum two-stage combination is VDF-VUF. Relatively higher nutrient removal is achieved in late summer (July and August) and early autumn (September), and the highest removal dfficiency is achieved in August. Mean concentrations of the chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (TP) removal efficiencies of VDF-VUF are (96.97±6.32)%, (89.45±5.29)% and (83.12±6.03)%, respectively, under high carbon loading treatment; (93.21±7.84)%, (94.27±4.36)% and (82.36±5.52)%, respectively, under high nitrogen loading treatment. COD and TN removal efficiencies under high carbon and nitrogen loading treatments are both only significantly affected (P<0.05) by season, combination, and the combined effect of season and combination, while the TP removal efficiency is not significantly affected (P>0.05) by any factors.