C/N对生物膜同步硝化反硝化效果及膜内DO有效扩散系数的影响  

The effect of C/N on simultaneous nitrification and denitrification and effective diffusion coefficient of DO in biofilm system

作　　者：曹勇锋[1] 张朝升[1] 荣宏伟[1] 郑桂林 CAO Yongfeng;ZHANG Chaosheng;RONG Hongwei;ZHENG Guilin(College of Civil Engineering,Guangzhou University,Guangzhou Guangdong 510006)

机构地区：[1]广州大学土木工程学院,广东广州510006

出　　处：《环境污染与防治》2018年第11期1229-1233,共5页Environmental Pollution & Control

基　　金：国家自然科学基金资助项目(No.21477027;No.51278133);广东省科技计划项目(No.2014A020216048;No.2014A020216049);珠江三角洲水质安全与保护教育部重点实验室开放课题资助项目(No.201702)

摘　　要：DO是影响污水脱氮处理系统同步硝化反硝化(SND)效果的重要因素,在系统中的扩散能力采用DO的有效扩散系数(D_e,m^2/s)来表征。运用DO微电极系统检测序批式生物膜反应器中正方体载体内部生物膜DO分布情况,结合扩散方程拟合求得生物膜内部的D_e,研究处理工艺在不同C/N下对SND效果及膜内D_e的影响。结果表明,当C/N为6～12时,D_e随着C/N的增加而缓慢增加,当C/N为12时,系统的SND效果最好,氨氮与TN去除率均为98%左右,对应的一级反应速率常数与D_e也达到最大,分别为0.004 50s^(-1)和2.30×10^(-9) m^2/s。DO is an important factor in the effect of simultaneous nitrification and denitrification（SND）in Sewage denitrogen treatment system which capacity of oxygen diffusing in system is manifested by effective diffusion coefficient（De,m^2/s）of DO.In the experiment,the microelectrode automation system was used to detect the distribution of DO in a PU carrier in SBBR process and combined the diffusion equation to obtain the Dein the biofilm to study the effect of different C/N on SND and Dein SBBR system.The results showed that Deslowly rose with the increased of C/N when C/N was 6-12.The removal efficiency of SND was the best（the removal rates of ammonia nitrogen and TN were all about 98%respectively）when C/N was 12.Meanwhile,the K and the D（e ）were also the maximum and were 0.004 50s^-1and 2.30×10^-9m^2/s,respectively.

关 键 词：同步硝化反硝化 C/N DO微电极 有效扩散系数 

分 类 号：X703[环境科学与工程—环境工程]