摘要
在高径比20的鼓泡SBR和高径比1.2的鼓泡-搅拌SBR反应器中,考察了好氧污泥颗粒化过程中,污泥粒径、分形维数、微生物特性的变化.建立流体动力学模型,对鼓泡和鼓泡-搅拌反应器中好氧颗粒污泥形成前后的能耗进行对比分析,从水力学角度分析2个反应器污泥特性出现差异的原因.结果表明,鼓泡反应器内在表观气速2.0cm/s条件下形成了均值粒径0.604mm,平均沉降速度(24±5.8)m/h,SVI 36.33mL/g,MLSS维持在4500mg/L左右,表面光滑的好氧颗粒污泥.鼓泡-搅拌反应器在搅拌速度300r/min、表观气速1.05cm/s的条件下,成功培养以丝状菌为骨架的好氧颗粒污泥,均值粒径可达1.123mm,污泥的平均沉降速度为(19.6±5.1)m/h,SVI为41.33mL/g,MLSS维持在3300mg/L左右.好氧颗粒污泥形成前后的能耗进行对比分析发现:好氧颗粒污泥培养初期,鼓泡-搅拌反应器因搅拌桨的加入,获得的湍动能远大于鼓泡反应器,约为100倍左右;而好氧颗粒形成之后,鼓泡反应器中上部位置的湍动能明显增加,且湍动能的大小大于鼓泡-搅拌反应器.相比较而言,鼓泡反应器相对节约能量.
The mean diameter,fractal dimension and microorganism characteristics during aerobic sludge granulation were investigated under bubble SBR with height-diameter ratio of 20 and bubble-stirring SBR with height-diameter ratio of 1.2.A computational fluid dynamics model was established to compare and analyze the energy consumption of conventional activated sludge and aerobic granular sludge in different reactors.The reasons for the differences in the characteristics of the two reactors were analyzed.The aerobic granular sludge with a mean diameter of 0.604mm.an average sedimentation rate of(24±5.8)m/h,a SVI of 36.33mL/g,a MLSS of about 4500mg/L and a smooth surface was formed under the condition of superficial gas velocity of 2.0cm/s in the bubble SBR.Under the conditions of stirring speed of 300r/min and superficial gas velocity of 1.05cm/s,the aerobic granular sludge were successfully formed with filamentous bacteria entangling on the surface of granules in the bubble-stirring SBR.The mean sludge diameter was up to 1.123mm,the average sedimentation rate of sludge was(19.6±5.1)m/h,SVI was 41.33mL/g,and MLSS was about 3300mg/L.The comparative analysis of energy consumption conventional between activated sludge and aerobic granular sludge showed that the turbulent kinetic energy of the bubble-stirring SBR was about 100times that of the bubble SBR at the activated sludge stage due to the addition of agitation.However,after the formation of aerobic granules,the turbulent kinetic energy in the upper part of the bubble SBR increased significantly,and the magnitude of the turbulent kinetic energy was larger than that of the bubble-stirring SBR.In comparison,the bubble SBR was relatively energy efficient.
作者
范文雯
袁林江
马远征
黄浩
FAN Wen-wen;YUAN Lin-Jiang;MA Yuan-Zheng;HUANG-Hao(School of Energy and Architecture,Xi’an Aeronautical University,Xi’an 710077,China;Key Laboratory of Environmental Engineering,Shanxi Province,Key Laboratory of Northwest Water Resources Environment and Ecology,Ministry of Education,School of Environmental and Municipal Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2021年第7期3229-3237,共9页
China Environmental Science
基金
西安航空学院博士科研启动基金资助(206011944)
国家自然科学基金资助项目(51278406)。
关键词
好氧颗粒污泥
SBR
能耗
计算流体动力学
aerobic granular sludge
SBR
energy consumption
computational fluid dynamic
