Removal of nutrients from wastewater with Canna indica L. under different vertical-flow constructed wetland conditions
Removal of nutrients from wastewater with Canna indica L. under different vertical-flow constructed wetland conditions
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不同垂直流人工湿地条件下美人蕉去除废水中营养物质的研究
DOI：
10.1016/j.ecoleng.2010.04.026
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发表时间：
2010-08-01
影响因子：
3.8
通讯作者：
Luo, Shiming
中科院分区：
文献类型：
--
作者：
Cui, Lihua;Ouyang, Ying;Luo, Shiming
人工湿地在世界范围内越来越受欢迎，用于去除生活污水中的污染物。研究了模拟垂直流人工湿地（VFCWs）在3种不同基质（分别为100 mg/L、100 mg/L和100 mg/L）下对污水中氮（N）和磷（P）的去除效果。BFAS或高炉人造矿渣、CBAS或燃煤人造矿渣、以及MSAS或中等尺寸砂人造矿渣）、水力负荷率（即，7、14和21 cm d（-1））、湿地运行期（0.5、1和2年）以及种植和不种植美人蕉（Canna indica L）。结果表明，由于BFAS中Ca和Al含量较高，BFAS对TP和NH_4 ~+-N的去除率最高，其次为CBAS和MSAS。由于硝化/反硝化过程复杂，基质对总氮（TN）的去除率为CBAS > MSAS > BFAS。各基质对营养盐的去除率为TP > NH_4 ~+-N > TN。种植美人蕉后，污水中TN的去除率提高了10%左右。较低的水力负荷或较长的水力停留时间（HRT）对TP、NH 4 +-N的去除率较高。而TN则是由于HRT较长时养分、基质和根系之间的接触和相互作用较多。从模拟VFCW去除NO3-N是一个复杂的过程。在高水力负荷下，由于硝化作用所需的NH 4 +-N和氧气较多，而水力停留时间较短不利于反硝化，因此出水NO3-N浓度较高。一般而言，较长的运行周期有最高的去除率的营养物质的VFCW。(C)2010 Elsevier B. V.保留所有权利。
Constructed wetlands are becoming increasingly popular worldwide for removing contaminants from domestic wastewater. This study investigated the removal efficiency of nitrogen (N) and phosphorus (P) from wastewater with the simulated vertical-flow constructed wetlands (VFCWs) under three different substrates (i.e., BFAS or blast furnace artificial slag, CBAS or coal burn artificial slag, and MSAS or midsized sand artificial slag), hydraulic loading rates (i.e., 7, 14, and 21 cm d(-1)), and wetland operational periods (0.5, 1, and 2 years) as well as with and without planting Canna indica L The wastewater was collected from the campus of South China Agricultural University, Guangzhou, China. Results show that the percent removal of total P (TP) and ammonium N (NH4+-N) by the substrates was BFAS > CBAS> MSAS due to the high contents of Ca and Al in substrate BFAS. In contrast, the percent removal of total N (TN) by the substrates was CBAS > MSAS > BFAS due to the complicated nitrification/denitrification processes. The percent removal of nutrients by all of the substrates was TP > NH4+-N > TN. About 10% more TN was removed from the wastewater after planting Canna indica L A lower hydraulic loading rate or longer hydraulic retention time (HRT) resulted in a higher removal of TP, NH4+-N. and TN because of more contacts and interactions among nutrients, substrates, and roots under the longer HRT. Removal of NO3-N from the simulated VFCWs is a complex process. A high concentration of NO3-N in the effluent was observed under the high hydraulic loading rate because more NH4+-N and oxygen were available for nitrification and a shorter HRT was unfavorable for denitrification. In general, a longer operational period had a highest removal rate for nutrients in the VFCWs. (C) 2010 Elsevier B.V. All rights reserved.