摘要
为提高人工快渗(CRI)系统的脱氮性能,构建了好氧(O)/缺氧(A)两段式CRI系统处理模拟生活污水,采用NaCl-pH协同调控的方式启动短程硝化反硝化,考察了其对NH_(4)^(+)-N、TN去除的强化效果。结果表明,进水中投加质量浓度为6 000 mg/L的NaCl运行13 d后,O-CRI反应柱的NO_(2)^(-)-N积累率可达到71.7%,此时提高进水pH至8.8,NO_(2)^(-)-N积累率可增高至95.5%,NaCl-pH协同调控可成功启动短程硝化。O/A-CRI系统稳定运行期间NH_(4)^(+)-N、TN去除率均值分别达到97.6%、87.5%,比对照组分别提高了2.9、41.3个百分点。O-CRI反应柱内的脱氮功能菌以氨氧化菌(AOB)为主,其中相对丰度较高的菌属为Nitrosomonas、Nitrosospira,而以Nitrospira为代表的亚硝酸盐氧化菌(NOB)的活性由于被选择性抑制而致使其相对丰度大幅减小,从而保障了NO_(2)^(-)-N的高效稳定积累。短程硝化反硝化为CRI系统强化脱氮提供了一条高效低耗的新途径。
To improve the nitrogen removal capability of the constructed rapid infiltration(CRI)system,a two-stage oxic(O)/anoxic(A)CRI system was designed to treat simulated domestic wastewater,and the enhanced effect on NH_(4)^(+)-N and TN removal was demonstrated via the use of NaCl-pH co-regulation to initiate short-range nitrification and denitrification.The results indicated that the NO_(2)^(-)-N accumulation rate in the O-CRI column could reach 71.7%after 13 days of operation with a mass concentration of 6000 mg/L NaCl in the influent water,and the NO_(2)^(-)-N accumulation rate could increase to 95.5%by raising the influent pH to 8.8 at this point,and the NaCl-pH co-regulation could successfully initiate short-range nitrification.The average values of NH_(4)^(+)-N and TN removal rate over steady running duration of the O/A-CRI system attained 97.6%and 87.5%,respectively,which were 2.9 and 41.3 percentage points higher than those of the control group.The nitrogen removing functional bacteria within the O-CRI reaction column were dominated by ammonia oxidizing bacteria(AOB),of which the relatively abundant genera were Nitrosomonas and Nitrosospira.While the relative abundance of nitrite oxidising bacteria(NOB),represented by Nitrospira,was significantly reduced due to the selective inhibition of activity,thus ensuring efficient and stable accumulation of NO_(2)^(-)-N.Short-range nitrification and denitrification provided a novel and efficient way for enhanced nitrogen removal performance of CRI systems.
作者
陈佼
李舒昕
黄琴
黄雯
唐成含
陆一新
CHEN Jiao;LI Shuxin;HUANG Qin;HUANG Wen;TANG Chenghan;LU Yixin(School of Materials and Environmental Engineering,Chengdu Technological University,611730;Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,611756:Chengdu,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2024年第3期91-96,共6页
Technology of Water Treatment
基金
国家自然科学基金项目(21705133)
四川省科技计划项目(2022YFG0307)
四川省自然科学基金项目(2022NSFSC0393)
四川省大学生创新训练计划项目(S202311116054)
成都工业学院实验室开放基金项目(2023CHZH03)。
关键词
人工快渗系统
短程硝化反硝化
协同启动
脱氮
CRI system
short-range nitrification and denitrification
co-initiation
nitrogen removal
