基于矿物组合滤料的异养同步脱氮除磷  

Simultaneous Heterotrophic Nitrogen and Phosphorus Removal with Mineral Combination Filter Material

作　　者：王少杭 陈天虎[1] 周凯[1] 周跃飞[1] 陈伟哲 李雅倩 邹雪华[1] 刘海波[1] WANG Shaohang;CHEN Tianhu;ZHOU Kai;ZHOU Yuefei;CHEN Weizhe;LI Yaqian;ZOU Xuehua;LIU Haibo(Laboratory of Nano minerals and Environmental Materials,School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学资源与环境工程学院,纳米矿物与污染控制安徽省高等学校重点实验室,合肥230009

出　　处：《硅酸盐学报》2024年第10期3106-3114,共9页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(42372050)。

摘　　要：异养反硝化深床滤池是目前深度脱氮最常用的方式方法,如何在异养反硝化滤池同一个反应器内实现同步脱氮除磷是非常值得研究探讨的科学问题和现实技术需求。以低品位胶磷矿为主要成分,添加硬石膏、煅烧菱镁矿颗粒作为填料构建异养脱氮动态柱,进行同步脱氮除磷研究。考察不同矿物组合对脱氮除磷的影响,查证基于低品位胶磷矿的组合滤料同步脱氮除磷可行性。通过扫描电子显微镜、透射电子显微镜、微生物群落分析对填料微观结构、新生矿物形貌、矿物与微生物界面关系进行表征,探究脱氮除磷机理。结果表明:低品位胶磷矿及其与硬石膏、煅烧菱镁矿颗粒物组合都可以作为异养脱氮微生物的载体,通过添加有机碳源反硝化脱氮,在水力停留时间不低于1h条件下,出水总氮稳定低于3mg/L,体系高pH值对脱氮效果基本没有影响;低品位胶磷矿+硬石膏+煅烧菱镁矿组合填料具有最好的同步脱氮除磷效果,在水力停留时间1 h条件下出水磷质量浓度稳定低于0.5 mg/L,达到城镇污水处理厂一级A排放标准要求(GB18918—2002)。该组合填料高效除磷作用的机制在于:硬石膏、煅烧菱镁矿分别缓释钙离子和羟基,促进了以低品位胶磷矿中磷灰石为晶种的晶体生长。生物膜的存在对磷灰石生长过程中离子扩散具有隔膜效应,除磷效果显著低于无菌体系。Introduction With the development of society,eutrophication is becoming more and more serious.Traditional sewage treatment technology is difficult to meet the requirements of environmental treatment. Efficient and economical deep nitrogen and phosphorusremoval technology is necessary. At present, biological method is often used for nitrogen removal, while physicochemical method iseffective for phosphorus removal. The technology of biological denitrification for nitrogen removal is mature and widely used. Interms of phosphorus removal, chemical precipitation usually requires additional structures and may cause secondary pollution.Physical adsorption has the disadvantages of low saturated adsorption capacity and high cost. Therefore, scholars have begun to payattention to the potential of some industrial solid waste and mineral waste with high activity, low cost and environmental friendliness.The development of phosphorus removal materials based on solid waste has become a current research hotspot. Compared with thetraditional physicochemical method, the crystallization method can reduce the structure and facilitate the recovery of phosphorus.Phosphate ore in China has the characteristics of rich ore and less poor ore, and due to improper development, a large number of minetailings are piled up at will, resulting in environmental pollution and resource waste. The collophanite is rich in apatite, which can beused as the crystal seed of phosphorus removal by crystallization method. The way not only can reduce the cost, but also realize theresource utilization of waste. In the early stage, the research group used mineral waste low-grade collophanite for deep phosphorusremoval in sewage and achieved good results. This paper further explores the possibility of simultaneous nitrogen and phosphorusremoval in one reactor by combining physicochemical and biochemical processes. The low-grade collophanite is used as the filler ofdenitrification denitrification filter, which not only acts as the carrier of denitrification micr

关 键 词：胶磷矿 菱镁矿 硬石膏 异养反硝化 脱氮除磷 

分 类 号：X753[环境科学与工程—环境工程]