复合改性陶粒生物滤池强化污水厂尾水脱氮除磷  

Effect of composite modified ceramsite biofilter to strengthen the nitrogen and phosphorus removal from wastewater plant tail water

作　　者：宋瑞[1] 余健[1] SONG Rui;YU Jian(College of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,长沙410082

出　　处：《环境工程学报》2025年第1期115-125,共11页Chinese Journal of Environmental Engineering

基　　金：湖南创新型省份建设专项经费资助项目(2019SK2111)。

摘　　要：随着城市污水处理厂排放标准的提高,二级污水处理厂低碳尾水的深度处理成为共同关注的问题。该研究以铁粉、黄铁矿、生物炭等修饰普通陶粒,通过对比实验考察了改性陶粒对污水厂低碳尾水的脱氮除磷效果。在温度为20℃,HRT为5.9h,C/N比约为1:2的条件下,改性陶粒滤池对TN、TP的去除率分别为98.45%、69.03%,显著高于普通陶粒滤池的7.4%、54.04%。传统的反硝化脱氮、铁自养反硝化、硫自养反硝化以及生物炭对微生物的富集等协同作用可大幅提高对低碳尾水的脱氮效果,增强系统的反硝化性能;磷的去除是生物与化学沉淀共同作用的结果。本研究为城市二级污水处理厂尾水的深度处理提供了一个很好的技术方案,对水环境保护具有重要意义。With the improvement of the discharge standard of urban wastewater treatment plants,the advanced treatment of low-carbon tailwater of secondary wastewater has become a common concern.In this study,iron powder,pyrite and biochar were used to modify ordinary ceramsite,and the effect of modified ceramsite as fillers on the removal effects of nitrogen and phosphorus from low-carbon tailwater of sewage plants were investigated through comparative experiments.Under temperature of 20℃,HRT of 5.9 h,and C/N ratio of about 1:2,the removal rates of TN and TP by the modified ceramsite filter were 98.45%and 69.03%,which were significantly higher than that in the ordinary ceramsite filter of 7.4%and 54.04%.Denitrification,ironbased autotrophic denitrification,sulfur-based autotrophic denitrification,and enriching microbial by biochar synergistically strengthened the denitrification of low-carbon tailwater,and enhanced the denitrification performance of the system;TP removal was a result of the joint action of biological and chemical precipitation.This study provides a good technical solution for the advanced treatment of municipal secondary wastewater treatment plant tailwater,which is of great significance for water environmental protection.

关 键 词：改性陶粒 铁粉 黄铁矿 生物炭 自养反硝化 微生物多样性 

分 类 号：X703[环境科学与工程—环境工程]