交替缺氧/好氧CAST处理低ρ_(COD)/ρ_(TN)生活污水的脱氮研究  

Biological Nitrogen Removal by Alternating Anoxic/aerobic CAST Treating Municipal Wastewater With a Low ρ_(COD)/ρ_(TN) Ratio

作　　者：彭永臻[1] 王丽[1] 马娟[1] 王少坡[1] 刘洋 马宁平 

机构地区：[1]北京工业大学北京市水质科学与水环境恢复重点实验室,北京100124 [2]中国水务控股有限公司,北京100022

出　　处：《北京工业大学学报》2012年第3期443-449,共7页Journal of Beijing University of Technology

基　　金：'十一五'国家科技支撑计划重点项目资助(2009BAC57B01)

摘　　要：以低ρCOD/ρTN生活污水为处理对象,在连续和分段2种进水方式下分析了交替缺氧/好氧循环式活性污泥法工艺的脱氮性能及曝气需求量,并研究了分段进水方式下pH、ρDO和氧化还原电位(oxidation reduction potential,ORP)的变化规律.结果表明,连续进水方式下,系统TN平均去除率75.1%,系统因长期低负荷运行而发生污泥膨胀,污泥容积指数(sludge volume index,SVI)平均值为229 mL/g,同时,曝气量升至0.56 m3/h时,才能使NH4+-N去除率大于99%;采用分段进水方式时,系统TN平均去除率可提高至81.5%,污泥沉降性能良好,并且曝气量降至0.24 m3/h时,系统NH 4+-N去除率仍大于99%,节省了运行费用.此外,当采用分段进水时,反应区内的pH值、ρDO和ORP值曲线有较明显的变化规律,并与反应区内污染物浓度的变化有着较好的相关性.Abstract： This study investigates the effects of continuous-feeding and step-feeding patterns on the nitrogen removal performance and the aeration rate under the anoxic/aerobic （A/O） condition of cyclicactivated sludge technology （CAST） process treating low pCOD/pTN wastewater, and analyzes the profiles of pH, DO and ORP under the step-feed mode. Results show that the average removal rate of pTN is75. 1% and SVI is 229 mL/g when the system runs under the continuous feeding mode, and activated sludge bulking occurs because of the operation under long-term condition of a low influent load. However, the average removal rate of pTN increases to 81. 5% and the average SVI decreases when thesystem runs under the step-feeding mode. Meanwhile, the aeration rate of the continuous-feeding mode is0.56 m^3/h but 0.24 m^3/h under the step-feeding mode when the removal rate of p （ NH4^＋-N） is above99%. Consequently, the operation cost can be significantly reduced by using the step-feeding mode. Furthermore, pH, DO, ORP curves have an observe variation during a cycle under the step-feed, which also have a better correlation with the variation of contamination in the system.

关 键 词：交替运行 低ρCOD/ρTN 生物脱氮 循环式活性污泥法 

分 类 号：X703.1[环境科学与工程—环境工程]