包埋有机缓释碳源强化二级出水的深度脱氮  

Improving the Advanced Nitrogen Removal of Secondary Effluent by Slow-Release Carbon Source with Embedding Microorganisms

作　　者：于鲁冀[1,3] 鲁浩天 李廷梅[3] 范鹏宇[3] 任昆阳 彭赵旭 YU Luji;LU Haotian;LI Tingmei;FAN Pengyu;REN Kunyang;PENG Zhaoxu(School of Ecology and Environment,Zhengzhou University;School of Water Conservancy Science and Engineering,Zhengzhou University;Research Center for Environmental Planning and Assessment of Zhengzhou University,Zhengzhou 450003,China)

机构地区：[1]郑州大学生态与环境学院 [2]郑州大学水利科学与工程学院 [3]郑州大学环境政策规划评价研究中心,河南郑州450003

出　　处：《水处理技术》2023年第5期135-140,共6页Technology of Water Treatment

基　　金：国家水体污染控制与治理科技重大专项项目(2015ZX07204-002-004);国家水体污染控制与治理科技重大专项(2012ZX07204-001-004)。

摘　　要：针对污水处理厂深度脱氮受制于进水碳氮比偏低的问题,以玉米芯和聚己内酯(PCL)为原料制备有机缓释碳源处理二级出水,比较了包埋微生物(二沉池菌悬液)与非包埋情况下的脱氮表现。结果表明,当进水硝态氮为5 mg/L(低浓度),10 mg/L(中浓度)和20 mg/L(高浓度)时,包埋菌悬液是强化脱氮效率的有效手段。当处理进水硝态氮低于10 mg/L时,包埋菌悬液缓释碳源的脱氮效果均较好,硝态氮去除率达97.34%以上。当进水硝态氮大于20 mg/L时,释碳量高的碳源仍能稳定脱氮,同时因较高的碳源利用效率,包埋碳源具有最佳总氮去除,去除率为88.80%。制备包埋活性污泥菌悬液的固态缓释碳源时,采用十二烷基硫酸钠(K12)发泡增加碳源的比表面积,可强化脱氮微生物的附着增殖,与活性污泥微生物相比,长期运行中出现了的反硝化功能菌属Methyloversatilis,丰度为16.06%。ITo solve the problem of low influent C/N ratio for advanced nitrogen removal in wastewater treatment plants,corn cob,and polycaprolactone were used as raw materials to prepare organic slow-release carbon sources for secondary effluent treatment.The nitrogen removal performance of embedding microorganisms(secondary sedimentation tank bacteria suspension)and non-embedding were compared.The results showed that when the influent nitrates were 5 mg/L(low concentration),10 mg/L(medium concentration),and 20 mg/L(high concentration),the embedding bacterial suspension effectively improved the nitrogen removal efficiency.When the influent nitrate was lower than 10 mg/L,the embedded bacterial suspension with a slow-release carbon source has a good nitrogen removal effect,and the removal rate of nitrate was higher than 97.34%.When the influent nitrate was more than 20 mg/L,the nitrogen removal performance could still be stable with the high carbon release of a solid carbon source.At the same time,due to the high carbon source utilization efficiency,the embedded carbon source has the best total nitrogen removal with a removal rate of 88.80%.Preparation of a solid carbon source embedded with the activated sludge bacterial suspension,sodium dodecyl sulfate(K12)was used to increase the specific surface area,and the proliferation of denitrifying bacteria would be strengthened.Compared with activated sludge microorganisms,the denitrifying bacteria enriched in the long-term operation were Methyloversatilis,with a relative abundance of 16.06%.

关 键 词：低碳氮比 深度脱氮 有机缓释碳源 包埋固定化 

分 类 号：X703.1[环境科学与工程—环境工程]