Dual removal of phosphate and ammonium from high concentrations of aquaculture wastewaters using an efficient two-stage infiltration system.
Dual removal of phosphate and ammonium from high concentrations of aquaculture wastewaters using an efficient two-stage infiltration system.
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DOI：
10.1016/j.scitotenv.2018.04.218
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发表时间：
2018-09
期刊：
影响因子：
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通讯作者：
Hongbin Yin;Chunhui Yang;Yanxia Jia;Huiui Chen;X. Gu
中科院分区：
文献类型：
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作者：
Hongbin Yin;Chunhui Yang;Yanxia Jia;Huiui Chen;X. Gu
近年来，水产养殖水体中氮（N）和磷（P）污染日益严重，迫切需要开发一种经济有效的方法来净化这些受污染的沃茨。本研究的目的是探讨使用两个阶段的渗透系统的基础上，氯化钠改性斜发沸石（NCLP）和热处理富钙沸石（TCAP）去除氮和磷。批量研究结果表明，NCLPs的最大铵吸附容量为6.64至7.27 mg。N/g，并且在所研究的三种粒径（0.2-0.5 mm、0.5 mm-1.0 mm和1-2 mm）中略有下降。150 d的柱试验结果表明，在水力停留时间（HRT）为16 h，进水浓度为50 mg N/L和10 mg P/L时，两级渗滤系统对N和P的平均去除率分别为99.4%和99.0%，去除率分别为50.3 g N/m3/d和8.83 g P/m3/d。当进水浓度分别增加到100 mg N/L和20 mg P/L时，系统对氨氮的平均去除率下降到65.3%，而对磷的平均去除率仍保持在97.9%左右，连续运行72 d。较长的水力停留时间有利于氮、磷的去除，但较短的水力停留时间会使NCLP滤池中吸附的氨氮浓度降低，从而使NCLP滤池的吸附能力得到恢复。长时间的干湿循环可以提高系统对氮的去除率，但对磷的去除率影响不大。吸附粘土中含有较高的N、P含量，可用作缓释肥料。本研究的结果表明，活性粘土为基础的处理系统可用于从水产养殖废水的N和P的双重去除，使可持续的水产养殖模式的发展成为可能。
Nitrogen (N) and phosphorus (P) pollution from aquaculture has increased dramatically in recent years, and it is urgent to develop a cost-effective method to clean these polluted waters. The objective of this study is to investigate N and P removal using a two-stage infiltration system based on NaCl modified clinoptilolite (NCLP) and thermally-treated calcium-rich attapulgite (TCAP). Results from a batch study indicated that the maximum ammonium sorption capacity of NCLPs was in the range of 6.64 to 7.27 mg. N/g and decreased slightly among the three particle sizes studied (0.2–0.5 mm, 0.5 mm–1.0 mm and 1–2 mm). A 150-day column experiment indicated that the two-stage infiltration system achieved an average removal efficiency of 99.4% N and 99.0% P, and a removal rate of 50.3 g N/m3/d and 8.83 g P/m3/d for an influent concentration of 50 mg N/L and 10 mg P/L with a hydraulic retention time (HRT) of 16 h. When the influent concentration increased to 100 mg N/L and 20 mg P/L, the average ammonium removal efficiency decreased to 65.3%, while the system can still keep a high average P removal efficiency of 97.9% for 72 days of the experiment. Longer HRT favored N and P removal efficiency, but short HRTs can oxygenate ammonium sorbed in the NCLP filter and thereby refresh its sorption capacity. The results also indicated that longer wet and dry cycles can enhance the N removal efficiency of the system, but had minor influence on P removal. The sorbed clays contained high N and P content and might have use as a slow-release fertilizer. The results of this study indicate that a reactive clay-based treatment system can be used for dual removal of N and P from aquaculture wastewaters, making possible the development of a sustainable aquaculture model.