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首页> 外文会议>International Water Association(IWA) Conference; 20050518-20; Xi'an(CN) >Pilot studies of factors influencing the simultaneous nitrification and denitrification in an oxidation ditch treating the domestic wastewater at low cost
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Pilot studies of factors influencing the simultaneous nitrification and denitrification in an oxidation ditch treating the domestic wastewater at low cost

机译：影响氧化沟低成本同时处理生活污水中硝化和反硝化同时进行的因素的初步研究

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摘要

To upgrade the existed wastewater treatment plants (WWTPs) using oxidation ditch with nitrogen removal, studies of factors influencing simultaneous nitrification and denitrification(SND), such as dissolved oxygen (DO), inner nitrate recycle, mixed liquor suspended solid(MLSS) concentration and the ratio of COD to total nitrogen were carried out to get high nitrogen removal efficiency. A pilot -scale Orbal oxidation ditch was used in the studies to treat the domestic wastewater from the septic tank which characters low ratio of COD to nitrogen in the influent, the equipment ran for eight months. The advantages of the research are the following: By controlling the DO level in the out channel, SND does happen in the pilot Orbal oxidation ditch and DO also is the key factor to nitrogen removal without definitely anoxic zone. Somehow, via SND, high nitrogen removal efficiency up to 60% can be stable achieved with an influent COD to total nitrogen ratio of average 3.4 and no any external carbon was added. No sludge settlement problem occurred during the period of low DO in the out channel. At the same time, low cost could be observed.
机译：为了利用氧化沟和脱氮技术升级现有废水处理厂（WWTPs），研究影响同时硝化和反硝化（SND）的因素，例如溶解氧（DO），内部硝酸盐再循环，混合液悬浮固体（MLSS）浓度和进行COD与总氮的比例可达到较高的脱氮效率。研究中使用了Orbal中试规模的氧化沟来处理化粪池中的生活污水，该化粪池的进水口中COD与氮的比率低，设备运行了八个月。该研究的优点如下：通过控制出气通道的DO含量，SND确实会在先导Orbal氧化沟中发生，并且DO也是在没有明显缺氧区域的情况下脱氮的关键因素。通过SND，通过进水COD与总氮之比平均为3.4，可以稳定地实现高达60％的高氮去除效率，并且无需添加任何外部碳。在出水道低溶解氧期间，没有污泥沉降问题。同时，可以观察到低成本。

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