缺氧区与好氧区HRT之比对污泥膨胀的影响  

Effect of Ratio of Hydraulic Retention Time between Anoxic Zone and Aerobic Zone on Sludge Bulking

作　　者：鲁文娟[1] 王浩龙 袁林江[2] LU Wen-juan;WANG Hao-long;YUAN Lin-jiang(School of Railroad Bridge and Architecture,Shaanxi Railway Insitiute,Weinan 714000,China;School of Environmental and Municipal Engineering,Xi'an University of Architecture and Technology,Xi'an 110055,China)

机构地区：[1]陕西铁路工程职业技术学院道桥与建筑学院,陕西渭南714000 [2]西安建筑科技大学环境与市政工程学院,陕西西安710055

出　　处：《中国给水排水》2021年第15期77-82,共6页China Water & Wastewater

摘　　要：采用人工模拟生活污水研究了缺氧区与好氧区水力停留时间之比分别为1∶3、1∶2、2∶1时,连续流A/O脱氮系统的净化效果与污泥沉降性的变化,探讨了系统中缺氧区与好氧区的水力停留时间之比与污泥膨胀之间的联系。结果表明,当缺氧区与好氧区的水力停留时间之比由1∶3增大到1∶2时,系统的脱氮率由50%提高到80%,污泥的SVI值由250 mL/g降低至110 mL/g,这在很大程度上改善了污泥的沉降性,抑制了污泥膨胀的发生。之后又以缺氧区与好氧区水力停留时间之比为2∶1运行,脱氮率最大达到88%,污泥的SVI值却停留在180~210 mL/g之间。研究发现,在这3个阶段,缺氧区水力停留时间不同,颗粒态基质在缺氧区的降解程度也不同,残留到好氧区的剩余基质浓度影响着系统中的主导丝状菌,因此也影响着污泥的絮体结构和沉降性能。研究结果还表明,可以通过改变缺氧区、好氧区的水力停留时间来影响系统的优势菌群,从而改善污泥膨胀情况。Variations in purification performance and sludge settleability in a continuous flow A/O denitrification system fed with synthetic wastewater were investigated when ratios of anoxic zone hydraulic retention time to aerobic zone hydraulic retention time were 1 ∶3, 1 ∶2 and 2 ∶1, respectively, and relationship between ratio of anoxic hydraulic retention time to aerobic hydraulic retention time and sludge bulking in the system were explored. When the ratio increased from 1 ∶3 to 1 ∶2, nitrogen removal efficiency of the system increased from 50% to 80%, and sludge volume index(SVI) decreased from 250 mL/g to 110 mL/g, which greatly improved the sludge settleability and inhibited the sludge bulking. Then, the ratio was adjusted to 2 ∶1, the maximum nitrogen removal efficiency reached 88%, and the value of SVI was between 180 mL/g and 210 mL/g. In the three stages, degradation degree of particle substrate in the anoxic zone was different with different anoxic hydraulic retention time, and the residual substrate concentration in the aerobic zone affected the dominant filamentous bacteria in the system, so it also affected the floc structure and settling performance of the sludge. In addition, dominant microbial community could be affected by changing the anoxic and aerobic hydraulic residence time in the system, so as to improve the sludge bulking.

关 键 词：缺氧区 好氧区 水力停留时间 污泥膨胀 

分 类 号：TU992[建筑科学—市政工程]