Excess nutrients in lakes, rivers, and streams harm aquatic ecosystems.y Advanced treatment at wastewater treatment plants can reduce this pollutant load.y An innovative nutrient removal system, ANAMMOX, anaerobically converts ammonium and nitrite to N2 gas.y 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.y A hollow fiber membrane reactor was employed to create this partial nitrification system.y 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.y This hollow fiber membrane was then used to control oxygen delivery to the partial nitrification system, producing an effluent with ammonium and nitrite.y Controlling dissolved oxygen at low concentration selects for ammonium oxidizing bacteria, while nitrite oxidizing bacteria are suppressed.y This system effectively treated influent ammonium concentrations ranging from 50 mg/L NH4+–N to 250 mg/L NH4+–N.y Real–time polymerase chain reaction (qPCR) was employed to verify the system preference for ammonium oxidizing bacteria.y Hollow fiber membrane aeration is effective forcontrolling oxygen transfer.
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机译:湖泊,河流和溪流中过多的养分危害水生生态系统。废水处理厂的高级处理可以减少这种污染物的负荷。创新的养分去除系统ANAMMOX可厌氧地将铵和亚硝酸盐转化为N2气体。 1:1.31 NH4 +:NO2-比率,将部分硝化系统与ANAMMOX系统耦合以提供必要的底物。y使用中空纤维膜反应器创建该部分硝化系统。y首先评估了气体传质以确定KLa氧转移系数。评估了反应器参数,例如混合速度,膜长度和气体压力,以确定这些变量如何影响KLa。y然后,将这种中空纤维膜用于控制氧向部分硝化系统的输送,并产生含氨的废水y通过控制低浓度的溶解氧选择铵氧化细菌,而抑制亚硝酸盐氧化细菌。y该系统有效处理了进水铵浓度范围从50 mg / L NH4 + –N到250 mg / L NH4 + –Ny Real–时间聚合酶链反应(qPCR)用于验证系统对铵氧化细菌的偏好。中空纤维膜曝气可有效控制氧的转移。
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