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首页> 外文期刊>Journal of Chemical Technology & Biotechnology >Evaluation of the parameters affectingnitrogen and phosphorus removal in anaerobic/anoxic/oxic(A/AO)biological nutrient removal systems
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Evaluation of the parameters affectingnitrogen and phosphorus removal in anaerobic/anoxic/oxic(A/AO)biological nutrient removal systems

机译：厌氧/缺氧/氧化（A / AO）生物营养去除系统中影响氮和磷去除的参数评估

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Considerable research has been performed on biological nutrient removal (BNR) systems which remove the problematic nutrients, nitrogen and phosphorus, that cause eutrophication. This research focussed on setting up two laboratory-scale anaerobiclanoxicloxic (AIAIO) systems and investigating their reliability while undergoing various parameter changes. Pump failure, in the first trial, Ri, led to a decrease in pH, exposure of the sludge to relatively low nitrate concentrations and reduction of the suspended solids concentration within the system. This adversely affected the phosphorus removal efficiency. Shock loading the system with increased influent phosphate concentrations for 56 days was shown to aid remediation of the phosphorus removal efficiency to values between 65 and 70% (wlw). The second trial, R2, highlighted the presence of bacteria capable of P-uptake under anoxic conditions (in the presence of nitrate). The characteristic anaerobic P-release was also evident. The bacteria responsible for phosphate uptake under anoxic conditions are thought to be the denitrifying phosphate removing bacteria (DPB). However, the presence of higher nitrate concentrations retarded the P-removal efficiency to some extent. Secondary release of P was evident in the clarifier of the AIAIO system during the R2 trial and especially during times of increased nitrate concentrations in the system. Between 20 and 40% (w/w) of the P taken up in the oxic stage of the system was released in the clarifier at various stages throughout the trial.
机译：关于生物营养去除（BNR）系统已经进行了大量研究，该系统可去除引起富营养化的有问题的营养物（氮和磷）。这项研究的重点是建立两个实验室规模的厌氧氧氮（OIAIO）系统，并研究它们在经历各种参数变化时的可靠性。在第一个试验Ri中，泵故障导致pH降低，污泥暴露于相对较低的硝酸盐浓度以及系统内悬浮固体浓度降低。这不利地影响了除磷效率。结果显示，在进水磷酸盐浓度增加的情况下，对系统造成的冲击负荷持续56天，有助于将除磷效率提高到65％至70％（w / w）之间。第二项试验R2强调了在缺氧条件下（存在硝酸盐）能够吸收P的细菌的存在。特征性厌氧P-释放也很明显。认为在缺氧条件下负责磷酸盐吸收的细菌是脱氮磷酸盐去除细菌（DPB）。但是，较高硝酸盐浓度的存在在一定程度上阻碍了P的去除效率。在R2试验期间，特别是在系统中硝酸盐浓度升高的时期，P的二次释放在AIAIO系统的澄清池中很明显。在整个试验中的不同阶段，在澄清器中释放了系统有氧阶段吸收的20％至40％（w / w）的P。

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