干湿交替运行对地下渗滤系统脱氮效果的影响  

Effects of alternate drying-wetting on nitrogen removal efficiency of subsurface infiltration system

作　　者：李英华[1] 李海波[1] 孙铁珩[1,2] 王鑫[1] 

机构地区：[1]沈阳大学区域污染环境生态修复教育部重点实验室,沈阳110044 [2]中国科学院沈阳应用生态研究所,沈阳110016

出　　处：《生态学杂志》2010年第10期2081-2085,共5页Chinese Journal of Ecology

基　　金：辽宁省教育厅创新团队项目(2009T069);辽宁省自然科学基金项目(20082195);国家自然科学基金项目(50908151);辽宁省高校优秀人才支持计划资助项目(LR201028)

摘　　要：利用室内模拟系统,在进水铵氮(NH4+-N)浓度30～37.5mg·L-1、水力负荷0.08m3.m-2.d-1的条件下,考察了干湿交替运行对污水地下渗滤系统脱氮效果的影响,分析了干湿比对基质理化性质、脱氮微生物数量以及基质氧化还原电位(ORP)变化的影响。结果表明,基质渗透率和硝化细菌的数量随干湿比的增加而增加,反硝化细菌的数量则随干湿比的增加而减少,比容积和氨化细菌的数量受干湿比的影响较小,各深度基质层ORP均随干湿交替运行而高低起伏。推荐地下渗滤系统启动期的干湿比3∶1,启动周期为20d;稳定运行期干湿比1∶1,NH4+-N及TN的去除率可分别达到86.9%和79.1%,同时,有机污染物去除效果好,出水水质满足再生利用-景观环境用水水质标准(GB/T18921—2002)。Subsurface infiltration system （SIS） is an efficient and economic technique in treating decentralized wastewater,but its nitrogen removal is frequently problematic,due to the complex inner environment of the system. In operating,intermittent running is a positive method to enhance the nitrogen removal of SIS. This paper studied the effects of alternate drying-wetting on the nitrogen removal efficiency of SIS in a laboratory experimental scale for domestic wastewater treatment. The experiment was conducted under the conditions of NH4^＋-N concentration 30-37.5 mg·L^-1and hydraulic loading 0.08 m^3·m^-2·d^-1With the increasing drying days,the substrate permeability and nitrifying bacterial quantity increased,specific volume and ammonifying bacterial quantity changed little,and denitrifying bacterial quantity declined. The ORP values at different depths fluctuated with the operation of drying-wetting. It was recommended that the drying-wetting ratio of SIS was 3：1 at the start-up period （20 days）,and was 1：1 in the period of stable operation. In these cases,the removal rates of NH4^＋-N and TN were 86.9% and 79.1%,respectively,and that of organic matter was considerably high,with the effluent meeting the standard of water quality for scenic environment use （GB/T 18921-2002）.

关 键 词：地下渗滤系统 生活污水 深度处理 干湿交替 

分 类 号：X703[环境科学与工程—环境工程]