考虑絮凝作用的辐流式二次沉淀池的三维数值模拟
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摘要
为研究絮凝作用在幅流式二次沉淀池中的变化规律,本次研究采用Ghadiri模型模拟絮团的破碎机理,通过UDF自定义聚集核心相关函数,运用RNG k-ε紊流模型、Mixture混合模型以及考虑速度差、布朗运动和紊动强度的聚合模型,对考虑絮凝作用的辐流式二次沉淀池,在不同的入流速度和入流温度的工况下进行了三维数值模拟。结果表明:絮凝作用对辐流式二次沉淀池的沉淀效率影响显著,高温入流更有利于污泥絮团的生长,入流速度选取在0.02~0.05 m/s之间时更利于提高沉淀池的利用效率。
In order to study the variation characteristics of the flocculation in radial-flow secondary sedimentation tank,the Ghadiri model was used in this research to simulate the crushing mechanism of floccules. The core of aggregating functions was defined by UDF. The RNG k- ε turbulence model,Mixture multi-phase model and Aggregation model,and the Aggregation model which considered the velocity difference,Brownian motion and Turbulence intensity were used in this study. Considering flocculation,the three-dimensional numerical simulation was carried out under different inflow velocities and inflow temperatures in the radial-flow secondary sedimentation tank. The results showed that,the effects of flocculation on the sedimentation efficiency of the radial-flow secondary sedimentation tank was significant.The high temperature inflow was more effective for the growth of the sludge floccules. The sedimentation efficiency of the sedimentation tank was improved when the inflow velocity were selected between 0. 02 m / s and 0. 05 m / s.
In order to study the variation characteristics of the flocculation in radial-flow secondary sedimentation tank,the Ghadiri model was used in this research to simulate the crushing mechanism of floccules. The core of aggregating functions was defined by UDF. The RNG k- ε turbulence model,Mixture multi-phase model and Aggregation model,and the Aggregation model which considered the velocity difference,Brownian motion and Turbulence intensity were used in this study. Considering flocculation,the three-dimensional numerical simulation was carried out under different inflow velocities and inflow temperatures in the radial-flow secondary sedimentation tank. The results showed that,the effects of flocculation on the sedimentation efficiency of the radial-flow secondary sedimentation tank was significant.The high temperature inflow was more effective for the growth of the sludge floccules. The sedimentation efficiency of the sedimentation tank was improved when the inflow velocity were selected between 0. 02 m / s and 0. 05 m / s.
引文
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[2]杨铁笙,熊祥忠,詹秀玲,等.粘性细颗粒泥沙絮凝研究概述[J].水利水运工程学报,2003(2):65-77.
[3]Cock W D,Blom P,Vaes G et al.The feasibility of flocculation in a storage sedimentation basin[J].Water Science and Technology,1999,39(2):75-83.
[4]金鹏康,王晓昌,郭坤.絮凝体的DLA分形仿真模拟及其分形维数的计算方法[C],中国化学会第八届水处理化学大会暨学术研讨会论文集.呼和浩特,2006.
[5]赵明.黏性细颗粒泥沙的絮凝及对河口生态的影响研究[D].北京:清华大学,2010.
[6]柴朝晖,杨国录,陈萌,等.黏性细颗粒泥沙静水絮凝-沉降模拟[J].四川大学学报(工程科学版),2012,44(S1):48-53.
[7]叶飞,许文峰,王学超.辐流式二次沉淀池固液两相流三维数值模拟[J].中国给水排水,2011,27(9):63-66.
[8]魏文礼,张泽伟,白朝伟,等.辐流式沉淀池进口挡板影响的液固两相流数值模拟[J].应用力学学报,2016,33(1):93-98.
[9]刘跃,谭立新.平流二沉池中计及温差影响的异重流数值模拟[J].西北农林科技大学学报(自然科学版),2013,41(9):221-228.
[10]黄忠钊.考虑絮凝作用的二次沉淀池三维数值模拟[D].西安:西安理工大学,2014.
[11]杨欢.考虑絮凝作用的辐流式沉淀池的数值模拟[D].西安:西安理工大学,2015.
[12]刘玉玲,张沛,魏文礼,等.辐流式沉淀池液固两相流力学特性三维数值模拟[J].水资源与水工程学报,2013,24(4):25-27.
[13]刘跃.计及温差影响的二次沉淀池内异重流的数值模拟[D].西安:西安理工大学,2014.