Effect of artificial aeration on the performance of vertical-flow constructed wetland treating heavily polluted river water
Effect of artificial aeration on the performance of vertical-flow constructed wetland treating heavily polluted river water
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DOI：
10.1016/s1001-0742(11)60804-8
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发表时间：
2012-01-01
影响因子：
6.9
通讯作者：
Chen, Weidong
中科院分区：
文献类型：
--
作者：
Dong, Huiyu;Qiang, Zhimin;Chen, Weidong
以不曝气（NA）、间歇曝气（IA）和连续曝气（CA）3种垂直流人工湿地（VFCWs）为研究对象，在不同水力负荷（HLR）条件下考察了人工曝气对重污染河水处理效果的影响。结果表明，人工曝气提高了IA和CA的溶解氧（DO）浓度，有利于有机物和NH 4 +-N的去除。间歇曝气引起的溶解氧梯度在IA内形成好氧区和缺氧区，从而促进总氮（TN）的去除。虽然3种VFCW对CODCr、NH 4 +-N和TN的去除率均随进水浊度的增加而降低，但人工曝气增强了反应器对污染物负荷波动的抵抗能力。试验结果表明，在相同的工艺条件下，81%，87%和37%），而最大的TN去除率（即，57%）。虽然人工曝气对TP去除效果的改善有限，但本研究证明了人工曝气应用于VFCW处理污染河水的可行性，特别是在高浊度条件下。
Three lab-scale vertical-flow constructed wetlands (VFCWs), including the non-aerated (NA), intermittently aerated (IA) and continuously aerated (CA) ones, were operated at different hydraulic loading rates (HLRs) to evaluate the effect of artificial aeration on the treatment efficiency of heavily polluted river water. Results indicated that artificial aeration increased the dissolved oxygen (DO) concentrations in IA and CA, which significantly favored the removal of organic matter and NH4+-N. The DO grads caused by intermittent aeration formed aerobic and anoxic regions in IA and thus promoted the removal of total nitrogen (TN). Although the removal efficiencies of CODCr, NH4+-N and TN in the three VFCWs all decreased with an increase in HLR, artificial aeration enhanced the reactor resistance to the fluctuation of pollutant loadings. The maximal removal efficiencies of CODCr, NH4+-N and total phosphorus (TP) (i.e., 81%, 87% and 37%, respectively) were observed in CA at 19 cm/day HLR, while the maximal TN removal (i.e., 57%) was achieved in 1A. Although the improvement of artificial aeration on TP removal was limited, this study has demonstrated the feasibility of applying artificial aeration to VFCWs treating polluted river water, particularly at a high HLR.