内循环频次对氧化沟反硝化除磷的影响  

Effect of Internal Recirculation Frequency on Denitrifying Phosphorus Removal in Oxidation Ditch

作　　者：常国松 于静洁 王少坡[1,2,3] 马华继 CHANG Guo-song;YU Jing-jie;WANG Shao-po;MA Hua-ji(School of Environmental and Municipal Engineering,Tianjin Chengjian University,Tianjin 300384,China;Tianjin Key Laboratory of Aquatic Science and Technology,Tianjin 300384,China;Municipal Experimental Teaching Demonstration Center of Environmental and Municipal Engineering,Tianjin Chengjian University,Tianjin 300384,China)

机构地区：[1]天津城建大学环境与市政工程学院,天津300384 [2]天津市水质科学与技术重点实验室,天津300384 [3]天津城建大学环境与市政市级实验教学示范中心,天津300384

出　　处：《中国给水排水》2022年第21期12-19,共8页China Water & Wastewater

基　　金：国家自然科学基金资助项目(51108299、51678388)。

摘　　要：以环状廊道前设置厌氧区、环状廊道内设置缺氧区和好氧区的改良氧化沟为研究对象,通过测定反硝化聚磷菌占总聚磷菌的比例(DPAOs/PAOs)以及水相和泥相的含磷量,对系统中的磷进行质量平衡分析,考察环状廊道内混合液的内循环频次(单位时间内混合液在环状廊道内循环流动的圈数,IRF)在0.52~18.74圈/h范围变化时对系统中污染物去除和磷转化途径的影响。结果表明,当IRF≤1.62圈/h时,有利于将更多的磷储存在细胞内形成胞内多聚磷酸盐;当IRF在3.36~7.53圈/h之间时,有利于反硝化除磷,且系统可获得较好的同步脱氮除磷效果,此时DPAOs/PAOs可达50%左右,COD、TN、TP的平均去除率分别可达到92%、80%和93%以上;当IRF≥11.35圈/h时,TN去除效果不佳,无法实现高效同步脱氮除磷。The phosphorus mass balance in a modified oxidation ditch(OD)with anaerobic zone in front of the circular corridor and anoxic and aerobic zones in the circular corridor was analyzed by determining the proportion of denitrifying phosphorus accumulating bacteria in the total phosphorus accumulating bacteria(DPAOs/PAOs)and the phosphorus concentration in wastewater and sludge.The effects of the internal recirculation frequency(cycles number of mixed liquor circulating in circular corridor per unit time,IRF)of the mixed liquor in the circular corridor on pollutants removal and phosphorus conversion pathways were investigated when the IRF varied from 0.52 circles/h to 18.74 circles/h.When IRF was not more than 1.62 circles/h,it was beneficial to store more phosphorus in cells to form intracellular polyphosphates.When IRF was between 3.36 circles/h and 7.53 circles/h,it was conducive to denitrifying phosphorus removal,and the system achieved better simultaneous nitrogen and phosphorus removal performance.In addition,the ratio of DPAOs to PAOs was approximately 50%,and the average removal rates of COD,TN and TP reached above 92%,80%and 93%,respectively.When IRF was not less than 11.35 circles/h,the TN removal performance was not good,and it was not conducive to efficient simultaneous nitrogen and phosphorus removal.

关 键 词：氧化沟 内循环频次 好氧除磷 反硝化除磷 胞外聚合物 

分 类 号：TU992[建筑科学—市政工程]