【PloS One】The Behavior of Organic Phosphorus under Non-Point Source Wastewater in the Presence of Phototrophic Periphyton

    水体富营养化是全球水体生态系统面临的重要环境问题之一，我国七大水系和内陆河均已受到严重的污染，80%的水域、90%以上的城市水源已受到富营养化的严重威胁。水体过多的磷输入是导致富营养化的最主要原因之一，研究发现在众多磷输入源中，农业面源输入是导致水体磷增加的主要来源之一。因此，如何控制好面源污水中磷浓度，对控制水体富营养化尤为重要。

    利用野外原位富集的自然生物膜对面源污水中的磷进行去除实验，研究发现自然生物膜对面源污水中有机磷（以ATP代替）的去除有良好的效果，实验结果表明自然生物膜可以产生足量的碱性磷酸酶，可以将水体中有机磷转化为无机磷。同时，进一步用模型拟合数据发现自然生物膜对有机磷的去除过程主要以吸附过程为主，并具有物理吸附的特征。吸附过程符合准二级动力学模型，且该过程分为三阶段：初期的外部质子边界传递阶段，中期的粒子内扩散阶段，后期的平衡饱和阶段。本研究为从面源污水中“提取”磷实现磷资源的再生利用提供了一定的理论基础。

Haiying Lu Linzhang Yang Shanqing Zhang Yonghong Wu. The Behavior of Organic Phosphorus under Non-Point Source Wastewater in the Presence of Phototrophic Periphyton. PLoS One 2014 DOI: 10.1371-journal.pone.0085910

Abstract

To understand the role of ubiquitous phototrophic periphyton in aquatic ecosystem on the biogeochemical cycling of organic phosphorus the conversion and removal kinetic characteristics of organic phosphorus (Porg) such as adenosine triphosphate (ATP) were investigated in the presence of the periphyton cultured in artificial non-point source wastewater. The preliminary results showed that the periphyton was very powerful in converting P_org evidenced by the fact that inorganic phosphorus (P_inorg) content in solution increased from about 0.7 to 14.3 mg P L⁻¹ in 48 hours in the presence of 0.6 g L⁻¹ periphyton. This was because the periphyton could produce abundant phosphatases that benefited the conversion of P_org to P_inrog. Moreover this conversion process was described more suitable by the pseudo-first-order kinetic model. The periphyton was also effective in removing P_org which showed that the P_org can be completely removed even when the initial P_org concentration was as high as 13 mg P L⁻¹ in 48 hours in the presence of 1.6 g L⁻¹ periphyton. Furthermore it was found that biosorption dominated the P_org removal process and exhibited the characteristics of physical adsorption. However this biosorption process by the periphyton was significantly influenced by biomass (absorbent dosage) and temperature. This work provides insights into P_org biogeochemical circulation of aquatic ecosystem that contained the periphyton or similar microbial aggregates.