Photomineralization of Effluent Organic Phosphorus to Orthophosphate under Simulated Light Illumination,Environmental Science & Technology

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Photomineralization of Effluent Organic Phosphorus to Orthophosphate under Simulated Light Illumination
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2019-04-18 , DOI: 10.1021/acs.est.9b00348
Xin Zhang ₁ , Jing Li ₁ , Wen-Yuan Fan ₁ , Guo-Ping Sheng ₁

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Organic phosphorus (OP), one of the main forms of phosphorus in effluent from biological wastewater treatment plants, may contribute to the bioavailable phosphorus pool as well as water eutrophication. However, little is known about the photomineralization of OP or the possible impacts on the phosphorus cycle in water bodies. Herein, the photomineralization of effluent OP was investigated. An increase in orthophosphate concentration was observed under illumination. The ³¹P liquid nuclear magnetic resonance spectra demonstrated that the release of orthophosphate resulted from photomineralization of OP. Furthermore, the photoproduced hydroxyl radicals (·OH) were proved to play a dominant role in the OP photomineralization. Nitrate, effluent organic matter (EfOM), and Fe(III) presented in effluent were the main chromophores for ·OH photoproduction, and their contributions to ·OH production and photomineralization of OP followed the order: nitrate > EfOM > Fe(III). Additionally, the carbonate (or bicarbonate) in the effluent and high pH were unfavorable for OP photomineralization. The present study revealed the photomineralization behavior of OP in actual effluent, suggesting that photomineralization of OP might contribute to eutrophication and may play a non-negligible role in phosphorus turnover in water bodies.

中文翻译：

模拟光照明下废水有机磷的光矿化为正磷酸盐

有机磷（OP）是生物废水处理厂废水中磷的主要形式之一，可能有助于生物利用磷库以及富营养化。然而，关于OP的光矿化或对水体中磷循环的可能影响知之甚少。在此，对废水OP的光矿化进行了研究。在光照下观察到正磷酸盐浓度的增加。在³¹P液体核磁共振光谱表明，正磷酸盐的释放是由OP的光矿化引起的。此外，已证明光生羟基自由基（·OH）在OP光矿化中起主导作用。硝酸盐，流出物中的有机物（EfOM）和Fe（III）是·OH光产生的主要生色团，它们对OP的·OH产生和光矿化的贡献顺序为：硝酸盐> EfOM> Fe（III）。另外，废水中的碳酸盐（或碳酸氢盐）和高pH值不利于OP光矿化。本研究揭示了OP在实际废水中的光矿化行为，

更新日期：2019-04-20

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