聚乙烯醇包埋玉米粒固体缓释碳源的反硝化效果  

Denitrification Performance of Sustained‑release Carbon Source Embedded in Corn with Polyvinyl Alcohol

作　　者：严子春[1,2] 杨明霞 高建军 YAN Zi‑chun;YANG Ming‑xia;GAO Jian‑jun(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Key Laboratory of Yellow River Water Environment of Gansu Province,Lanzhou 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070 [2]甘肃省黄河水环境重点实验室,甘肃兰州730070

出　　处：《中国给水排水》2024年第11期89-94,共6页China Water & Wastewater

基　　金：甘肃省科技计划项目(20JR2RA0002);国家自然科学基金资助项目(51568034)。

摘　　要：为解决城市污水深度处理中碳源不足而导致的脱氮效果不佳问题,采用聚乙烯醇包埋法制备了以玉米粒为有效释碳成分的固体缓释碳源(PECP)。采用扫描电镜(SEM)观察发现,PECP表面粗糙多孔,适宜微生物附着生长,存在有机物释放的通道。释碳规律与反硝化效果试验结果表明,PECP的碳源释放量在第20天时接近最大值,运行到第40天时未出现明显下降现象,释碳过程满足二级动力学方程;当进水TN浓度为51.42 mg/L时,投加PECP的反硝化滤柱对TN的去除率为74.44%,与未投加相比提高了39.36%。PECP的碳源释放速率稳定、使用周期较长、脱氮效率较高,可为开发成本低廉的固体缓释碳源提供新思路。This paper prepared a sustained‑release carbon source(PECP)with corn as the effective constituent by polyvinyl alcohol embedding method,so as to solve the problem of poor nitrogen removal performance caused by insufficient carbon source in advanced treatment of municipal wastewater.The scanning electron microscopy(SEM)observation showed that the surface of PECP was rough and porous,which was suitable for the attached growth of microbes and provided channels for organic matter release.The carbon release and biological denitrification test showed that the concentration of organic matter released by PECP approached the maximum value on the 20th day and did not decrease significantly until the 40th day,and the carbon release process satisfied the second‑order kinetic equation.When the influent TN concentration was 51.42 mg/L,the TN removal rate of the denitrifying filter packed with PECP was 74.44%,which was 39.36%higher than that without PECP.The stable carbon release rate,long service life and high nitrogen removal efficiency of PECP provide a new idea for the development of low cost sustained‑release carbon sources.

关 键 词：缓释碳源 玉米粒 释碳性能 反硝化 

分 类 号：TU992[建筑科学—市政工程]