含磷污水排放到自然水体不仅造成水体富营养化，也是磷资源的严重浪费。传统的除磷工艺往往只考虑了磷的去除，而没有考虑对磷资源进行回收利用。本项目以农业废弃物作为原料制备生物碳，以扩孔造粒后的生物碳作为基体负载纳米水合氧化铁制备新型复合材料，利用生物碳的微孔结构、纳米水合氧化铁的超大比表面积和对磷酸盐的选择吸附活性的协调效应，开发水合氧化铁包覆粒状生物碳复合吸附剂，用于水中磷酸盐去除及磷资源回收。考察生物碳-水合氧化铁复合材料吸附磷酸盐的性能，从宏观和微观角度揭示其吸附磷酸盐的过程与机理。为进一步提高吸附磷的生物可利用性，在铁磷吸附体系中通过Shewanella oneidensis MR-1的异化还原作用，在生物碳表面诱导生成蓝铁石，对铁磷吸附体系中铁的异化还原过程进行解析，阐明蓝铁石的形成过程与机制。研究成果将为水体富营养化的控制以及磷的回收提供新材料和新方法。

Discharge of phosphorus-containing wastewater not only causes the eutrophication of the water bodies, but also leads to a serious waste of phosphorus resourse. Troditional wastewater treatment processes are mainly focused on the removal of phosphorus, but ignore the recovery of phosphorus. To solve this problem, biochar will be prepared based on the agricultural waste in this proposal. Nanosized FeOOH will be further loaded on the matrix of granular biochar to develop new hybrid adsorbent of phosphate. Phosphate can be adsorbed by this hybrid adsorbent due to the micropore structure of biochar, the large surface area of FeOOH and the selectivity of FeOOH on phosphate. The performance and adsorption mechanism of the adsorbent will be investigated. In order to further improve the bioavalibility of the adsorbed phosphorus, the dissimilatory iron reduction microorganism, Shewanella oneidensis MR-1, will be utilized to reduce Fe(III) to form vivianite. This process will be analyzed to illustrate the mechanism. These results will provide promising materials and new methods for the control of eutrophication and the recovery of phosphorus.