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首页> 外文期刊>Journal of Environmental Management >Phosphorus species and fractionation — Why sewage derived phosphorus is a problem
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Phosphorus species and fractionation — Why sewage derived phosphorus is a problem

机译：磷的种类和分级分离-为什么污水中的磷是一个问题

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Phosphorus (P) inputs to sewage treatment works (STW) come from a variety of sources and filtration of treated wastewater prior to discharge into receiving waters is a common practice. This means P in treated wastewaters may be present in forms that are potentially more bioavailable and mobile. We conducted a 2-year study to determine P species up and downstream of two STW outfalls into two tributaries of the River Thames. Downstream of the outfalls, P concentrations in both rivers were frequently greater by an order of magnitude for all species of P. A high proportion of total P (TP) in the downstream waters was determined as dissolved, which was largely comprised of soluble reactive P (SRP) - considered as the most bioavailable P species. Furthermore no significant difference in SRP was found in receiving waters passed through 0.45 and 0.10 urn filters. This means that P from STWs occurs in <0.1 um fraction size, which will not readily settle to the channel bed and is more easily assimilated by biota. This distinguishes STW inputs from agricultural runoff where a high proportion of P occurs as particulate P which is both less bioavailable and more likely to settle to the channel bed. This implies that STWs derived P is likely to have a greater adverse impact on the receiving river than agricultural runoff.
机译：污水处理厂（STW）的磷输入来自多种来源，在排放到接收水之前对经过处理的废水进行过滤是一种常见的做法。这意味着处理后的废水中的P可能以生物利用度和移动性更高的形式存在。我们进行了为期两年的研究，确定了两个STW排污口上游和下游进入泰晤士河两个支流的P物种。在排污口的下游，两条河流中的P浓度通常都比所有P物种高一个数量级。下游水中总P（TP）的高比例被确定为溶解，其中大部分由可溶性反应性P组成。 （SRP）-被认为是生物利用度最高的P物种。此外，在通过0.45和0.10微米滤池的接收水中，SRP没有发现显着差异。这意味着来自STW的P以小于0.1 um的级分大小出现，不易沉降到通道床中，更容易被生物体吸收。这将STW投入与农业径流区分开来，在农业径流中，高比例的P以颗粒P的形式出现，这不仅生物利用度较低，而且更有可能沉降到河床层。这意味着，STW派生的P可能比农业径流对接收河流的不利影响更大。

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