Phosphorus removal from lagoon-pretreated swine wastewater by pilot-scale surface flow constructed wetlands planted with Myriophyllum aquaticum.
Phosphorus removal from lagoon-pretreated swine wastewater by pilot-scale surface flow constructed wetlands planted with Myriophyllum aquaticum.
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DOI：
10.1016/j.scitotenv.2016.10.094
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发表时间：
2017-01
期刊：
影响因子：
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通讯作者：
Pei Luo;Feng Liu;Xin-liang Liu;X. Wu;Ran Yao;Liang Chen;Xi Li;R. Xiao;Jinshui Wu
中科院分区：
文献类型：
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作者：
Pei Luo;Feng Liu;Xin-liang Liu;X. Wu;Ran Yao;Liang Chen;Xi Li;R. Xiao;Jinshui Wu
人工湿地作为一种成本相对较低的畜禽养殖废水处理技术，其除磷性能的提高仍是亟待解决的问题。在这项研究中，一个三级中试规模的CW系统组成的三个表面流CW（CW 1，CW 2，CW 3）在从入口到出口串联构建处理猪场废水（SW）从泻湖。CW种植Myriophyllum aquaticum。考虑到不同的入口负荷率，将三种浓度的养猪废水（低浓度：33% SW、中浓度：66% SW和高浓度：100% SW）输入CW系统，以测定总磷（TP）去除效率并阐明植物收获的重要作用。2014-2016年的结果表明，在不同的进水负荷率下，三级CW系统对TP的平均累积去除率和去除率分别为78.2-89.8%和0.412-0.779 g m− 2d− 1。TP的去除率和去除速率常数随时间的变化，这取决于温度条件和水生微藻的年生长模式。除高强度SW的CW 1外，其他CW的磷捕获量为15.1-40.9 g m-2 yr-1，占SFCW TP质量去除率的22.5-59.6%。CW 1对TP的去除主要是通过吸附和沉淀作用，而CW 2和CW 3主要是通过水生微藻的吸收和多次收获作用。试验结果表明，种植水生微囊藻的三级连续流系统对高浓度的猪场废水中的TP具有较高的去除效率。然而，高强度SW中TP的去除率为70.1 ± 23.3%，流出浓度为17.0 ± 14.9 mg L− 1，仍然很高。高强度SW的最佳加载速率仍然需要研究这里提出的CW系统。
Although constructed wetlands (CWs) are used as one relatively low-cost technology for livestock wastewater treatment, the improvement of phosphorus removal in CWs is urgently needed. In this study, a three-stage pilot-scale CW system consisting of three surface flow CWs (SFCWs; CW1, CW2, and CW3) in series from inlet to outlet was constructed to treat swine wastewater (SW) from a lagoon. The CWs were planted withMyriophyllum aquaticum. Considering different inlet loading rates, three strengths of swine wastewater (low: 33% SW, medium: 66% SW, and high: 100% SW) were fed to the CW system to determine total phosphorus (TP) removal efficiency and clarify the important role of plant harvest. Results from the period 2014–2016 indicate that the three-stage CW system had mean TP cumulative removal efficiencies and removal rates of 78.2–89.8% and 0.412–0.779 g m− 2d− 1respectively, under different inlet loading rates. The TP removal efficiency and removal rate constant had temporal variations, which depended on temperature condition and the annual growth pattern ofM.aquaticum. The harvested phosphorus mass was 15.1–40.9 g m− 2yr− 1in the CWs except for CW1 with high strength SW, and contributed 22.5–59.6% of TP mass removal rate by the SFCWs. The TP removal was mainly by adsorption and precipitation in the substrate in CW1 but by uptake and multiple harvests ofM.aquaticumin CW2 and CW3. The results suggest the three-stage CW system planted withM.aquaticumis suited for removing high TP concentrations from swine wastewater with a high removal efficiency. However, TP removal in high strength SW amounted to 70.1 ± 23.3%, and the outflow concentration of 17.0 ± 14.9 mg L− 1was still high. Optimal loading rates for high strength SW still need to be investigated for the CW system presented here.