【摘要】 为提高人工湿地收割植物利用率并探讨水体中氨氮对镁改性生物炭（magnesium modified biochar,MBC）除磷效果的影响,本文以人工湿地植物芦苇为原料,引入金属镁离子对其改性,制备MBC,并以未改性生物炭（biochar,BC）为对照,通过批量摇床实验,研究了不同氮磷摩尔比（0、5、10）和初始磷浓度（100～500 mg·L-1）条件下,MBC、BC、BC与金属镁离子(BC+Mg²⁺)、Mg²⁺这4种处理方式对磷酸盐的去除效果.结果表明,4种处理方式对磷的去除量排序为MBC>>BC+Mg²⁺≈Mg²⁺> BC,溶液中NH+4的存在促进MBC吸附除磷,氮磷摩尔比越大,初始磷浓度越高,MBC的磷吸附能力越强. XRD图谱分析结果表明,在MBC、BC+Mg²⁺、Mg²⁺这3种处理方式中,当氮磷摩尔比为5、10时,NH+4与溶液中的Mg²⁺和PO3-4发生沉淀反应,生成鸟粪石（MgNH4PO4·6H2O）,促进磷的去除.本研究利用人工湿地废弃生物质对富含氨氮和磷酸盐的溶液进行处理,确定了氨氮对水体中磷酸盐去除的促进作用,达到了回收利用、以废治废的目的,为水体富营养化治理提供了新的理论依据和数据支持.更多还原

【Abstract】 The effect of ammonia-nitrogen in water on phosphorus removal by magnesium modified biochar（ MBC） was developed to increase the utilization of wetland plants. The crystal structures were measured by X-ray powder diffraction（ XRD）. MBC was prepared using reed as the biomass feedstock,which was modified with magnesium chloride. The raw biochar（ BC） was prepared as a control.The removal of phosphate from solution using four different methods,i. e. MBC,BC,BC,and MgCl2 solutions( BC + Mg²⁺) and MgCl2 solutions( Mg²⁺),under different nitrogen to phosphorus molar ratios and initial phosphorus concentrations was investigated in batch experiments. The results demonstrated that the phosphorus removal efficiency of the four treatment methods,which followed the order of MBC>>BC + Mg²⁺≈Mg²⁺> BC. NH+4 in the solution,promoted phosphorus removal by MBC. In addition,the larger the ratio of nitrogen to phosphorus and the higher the initial phosphorus concentration,the stronger the phosphorus removal capacity of MBC was. In the three treatments with MBC,BC + Mg²⁺,and Mg²⁺,the XRD analysis showed that NH+4 reacted with Mg²⁺and PO3-4 in the solution to form MgNH4 PO4·6 H2 O at N∶ P = 5 or 10,promoting the removal of phosphorus. For recycling purposes,waste biomass from constructed wetlands could be used to produce MBC and treat polluted water rich in ammonium and phosphate. Moreover,the ammonium-nitrogen promotes the phosphate removal by MBC. The results from this study provide a new theoretical basis and data support for the treatment of water eutrophication.更多还原