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Partial nitrification and oxygen transfer analysis utilizing hollow fiber membrane aeration.

机译:利用中空纤维膜曝气进行部分硝化和氧转移分析。

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摘要

Excess nutrients in lakes, rivers, and streams harm aquatic ecosystems. Advanced treatment at wastewater treatment plants can reduce this pollutant load. An innovative nutrient removal system, ANAMMOX, anaerobically converts ammonium and nitrite to N2 gas. Because this system requires a 1:1.31 NH4+ : NO2- ratio, a partial nitrification system is coupled with the ANAMMOX system to provide the necessary substrates. A hollow fiber membrane reactor was employed to create this partial nitrification system. Gas mass transfer was first evaluated to determine the KLa oxygen transfer coefficient. Reactor parameters, such as mixing speed, membrane length, and gas pressure, were evaluated to determine how KLa was affected by these variables. This hollow fiber membrane was then used to control oxygen delivery to the partial nitrification system, producing an effluent with ammonium and nitrite. Controlling dissolved oxygen at low concentration selects for ammonium oxidizing bacteria, while nitrite oxidizing bacteria are suppressed. This system effectively treated influent ammonium concentrations ranging from 50 mg/L NH4 +-N to 250 mg/L NH4+-N. Real-time polymerase chain reaction (qPCR) was employed to verify the system preference for ammonium oxidizing bacteria. Hollow fiber membrane aeration is effective for controlling oxygen transfer.
机译:湖泊,河流和溪流中过多的养分损害了水生生态系统。在废水处理厂进行深度处理可以减少这种污染物的负荷。创新的营养去除系统ANAMMOX可厌氧地将铵和亚硝酸盐转化为N2气体。由于该系统要求NH4 +:NO2-的比例为1:1.31,因此将部分硝化系统与ANAMMOX系统结合使用,以提供必要的底物。使用中空纤维膜反应器来创建该部分硝化系统。首先评估气体传质,以确定KLa氧气传递系数。评估反应器参数,例如混合速度,膜长度和气压,以确定这些变量如何影响KLa。然后将该中空纤维膜用于控制氧向部分硝化系统的输送,从而产生含有铵和亚硝酸盐的废水。将溶解氧控制在低浓度下可以选择铵氧化细菌,而亚硝酸盐氧化细菌则受到抑制。该系统有效地处理了进水铵浓度范围从50 mg / L NH4 + -N到250 mg / L NH4 + -N。实时聚合酶链反应(qPCR)用于验证铵氧化细菌对系统的偏好。中空纤维膜曝气可有效控制氧气的传输。

著录项

  • 作者

    Cotter, Samuel Wesley.;

  • 作者单位

    Iowa State University.;

  • 授予单位 Iowa State University.;
  • 学科 Environmental Studies.;Engineering Environmental.;Water Resource Management.
  • 学位 M.S.
  • 年度 2010
  • 页码 74 p.
  • 总页数 74
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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