Zhi Meng-Meng, Wang Peng-Fei, Hou Ze-Ying, Cao Jing, Chu Zhao-Sheng, Yang Yong-Zhe
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Institute of Lake Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Huan Jing Ke Xue. 2019 Feb 8;40(2):669-676. doi: 10.13227/j.hjkx.201807061.
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 MgCl solutions (BC+Mg) and MgCl solutions (Mg), 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+Mg≈Mg>BC. NH 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+Mg, and Mg, the XRD analysis showed that NH reacted with Mg and PO in the solution to form MgNHPO·6HO 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.
为提高湿地植物的利用率，研究了水中氨氮对镁改性生物炭（MBC）除磷效果的影响。通过X射线粉末衍射（XRD）测定晶体结构。以芦苇为生物质原料，用氯化镁对其进行改性制备MBC。制备原始生物炭（BC）作为对照。通过批量实验研究了在不同氮磷摩尔比和初始磷浓度下，使用四种不同方法（即MBC、BC、BC与氯化镁溶液混合（BC + Mg）和氯化镁溶液（Mg））从溶液中去除磷酸盐的情况。结果表明，四种处理方法的除磷效率顺序为MBC>>BC + Mg≈Mg>BC。溶液中的NH促进了MBC对磷的去除。此外，氮磷比越大，初始磷浓度越高，MBC的除磷能力越强。在MBC、BC + Mg和Mg的三种处理中，XRD分析表明，在N:P = 5或10时，NH与溶液中的Mg和PO反应形成MgNHPO·6HO，促进了磷的去除。为实现循环利用，人工湿地的废弃生物质可用于生产MBC并处理富含铵和磷酸盐的污水。此外，氨氮促进了MBC对磷酸盐的去除。本研究结果为水体富营养化治理提供了新的理论依据和数据支持。
