曝气量和盐度对硝化型颗粒污泥脱氮速率及粒径分布的影响  

Effects of aeration rate and salinity on the denitrification rate and particle size distribution of nitrifying granular sludge

作　　者：付雪 毛佩玥 赵鑫磊 邢嘉伟 秦彦荣 陈永志[1,2,3] FU Xue;MAO Peiyue;ZHAO Xinlei;XING Jiawei;QIN Yanrong;CHEN Yongzhi(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070;Technical Center of Sewage Treatment Industry in Gansu,Lanzhou 730070;Key Laboratory of Yellow River Water Environment in Gansu Province,Lanzhou 730070)

机构地区：[1]兰州交通大学环境与市政工程学院,兰州730070 [2]甘肃省污水处理行业技术中心,兰州730070 [3]甘肃省黄河水环境重点实验室,兰州730070

出　　处：《环境科学学报》2021年第4期1293-1302,共10页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.51668033);甘肃省自然科学基金(No.18JR3RA126);甘肃省高等学校特色专业-环境工程项目(No.101004)。

摘　　要：采用SBR反应器,在交替缺氧/好氧模式下处理低C/N生活污水,考察曝气量、盐度对短程硝化好氧颗粒污泥脱氮速率及粒径分布的影响.结果表明,在25℃、pH为7.5~8.0条件下,当进水NH^(+)4_(-)N为65 mg·L^(-1)时,控制曝气量分别为8.75、12.50和16.25 L·h^(-1)·L^(-1),在第35、24和23个周期时NH^(+)4_(-)N去除率分别高达95.49%、98.46%和98.54%,选取12.50 L·h^(-1)·L^(-1)为最佳曝气量.控制在最佳曝气量条件下,当盐度为0时,NH^(+)4_(-)N去除率及亚硝积累率分别为98.46%和90.42%;在盐度为5.0%时,NH^(+)4_(-)N去除率和亚硝积累率分别为98.34%和96.71%.当曝气量从8.75 L·h^(-1)·L^(-1)提升为16.25 L·h^(-1)·L^(-1),颗粒污泥平均粒径由170μm增大为231.5μm;控制曝气量在12.5 L·h^(-1)·L^(-1),增加盐度至5.0%,颗粒污泥平均粒径由231μm下降至156μm,其占比由40.50%增加到48.26%.The SBR reactor was used to treat low-carbon to nitrogen ratio(C/N) domestic sewage in alternating anoxic/aerobic mode, and the effects of aeration rate and salinity on the nitrogen removal rate and particle size distribution of short-cut nitrification aerobic granular sludge were investigated. The results showed that when the temperature was 25 ℃, and the pH was 7.5~8.0, and the influent NH^(+)4_(-)N was 65 mg·L^(-1), the removal rate of NH^(+)4_(-)N was as high as 95.49%, 98.46% and 98.54% in the 35 th, 24 th and 23 rd cycles, and 12.5 L·h^(-1)·L^(-1) was selected as the optimal aeration rate. Controlling the aeration rate to 12.5 L·h^(-1)·L^(-1), When the salinity was 0, the removal rate of the ammonia nitrogen and the accumulation rate of nitrite nitrogen were 98.46% and 90.42%, respectively. When the salinity was 5.0%, the removal rate of the ammonia nitrogen and the accumulation rate of nitrite nitrogen were 98.34% and 96.71%, respectively. The aeration rate was increased from 8.75 L·h^(-1)·L^(-1) to 16.25 L·h^(-1)·L^(-1), the average particle size was increased from 170.0 μm to 231.5 μm. When the aeration rate was controlled at 12.5 L·h^(-1)·L^(-1) and the salinity was increased to 5.0% simultaneously, the average particle size was decreased from 231 μm to 156 μm, and the proportion of it increased from 40.50% to 48.26%.

关 键 词：颗粒污泥 脱氮速率 比耗氧速率(SOUR) 盐度 粒径分布 

分 类 号：X703[环境科学与工程—环境工程]