Comparative evaluations of organic matters and nitrogen removal capacities of integrated vertical-flow constructed wetlands: Domestic and nitrified wastewater treatment
Comparative evaluations of organic matters and nitrogen removal capacities of integrated vertical-flow constructed wetlands: Domestic and nitrified wastewater treatment
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一体化垂直流人工湿地有机物和氮去除能力的比较评价：生活废水和硝化废水处理
DOI：
10.1080/10934529.2015.1012009
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
WEI LIANG
中科院分区：
文献类型：
--
作者：
JUN J. CHANG;KANG LIANG;SUQ. WU;SHENG H. ZHANG;WEI LIANG
建立了两组综合垂直流人工湿地（IVCW）微生态系统，在两种负荷量（LRs）下处理两种具有代表性的生活污水和硝化废水，时间约为2年。考察并比较了两种膜对有机物和氮的去除能力，以及负载速率（LR）、出水温度和溶解氧（DO）浓度的影响。结果表明，IVCWs对COD的去除效果较好，质量去除率随LRs的增加呈线性增长，在最高负载率下达到56.07 g m−2 d−1。尽管如此，出水COD浓度也有所增加，在最高负荷率下，其平均值超过了中国城市污水处理厂的A类排放标准（< 50 mg L−1）。在高LR条件下，两种废水的总氮（TN）质量去除率更高，但效率较低，并且与生活废水（DW）相比，硝化废水（NW）的去除率更好，这可能是由于IVCW床内普遍存在的缺氧条件限制了DW的硝化过程。LR、温度和DO对COD去除率的影响较小，但对TN的去除率均显著。与DO相比，温度对氮的去除更为关键，NW低LR对TN去除的温度依赖系数显著大于其他。
Two groups of integrated vertical-flow constructed wetland (IVCW) microcosms were established for treating two types of representative wastewater: domestic and nitrified wastewater under two loading rates (LRs) over about two years. Their removal capacities of organic substance and nitrogen as well as the effects of loading rate (LR), outflow temperature and dissolved oxygen (DO) concentration were investigated and compared. Efficient chemical oxygen demand (COD) eliminations were achieved by the IVCWs, with the mass removal rates increasing linearly with the increasing LRs strongly, achieving average value of 56.07 g m−2 d−1 at the highest loading rate. Nevertheless, the effluent COD concentrations also increased, with the average value exceeding Class I A discharge standard (< 50 mg L−1) for municipal wastewater treatment plants in China at the highest loading rate. Greater total nitrogen (TN) mass removal rates but lower efficiencies were obtained at the high LR for both types of wastewater, and better removal was achieved for nitrified wastewater (NW) in comparison to domestic wastewater (DW), probably due to the prevailing anoxic conditions inside the IVCW beds restricted nitrification process of DW. The influences of LR, temperature and DO on COD removal were slight, but all remarkable on TN reduction. As compared to DO, temperature was more crucial for nitrogen removal, and the temperature dependence coefficient for TN removal of low LR of NW was significantly greater than others.