不同回流比与配水管高度下水泵循环式调质池数值模拟  

Numerical simulation of water pump forced water quality equalization basin under different reflux ratios and reflux distribution pipe height

作　　者：张新喜[1,2] 王凯 钟梅英 冯承民[1] 胡小兵 邱高[1] 李嘉伟 王晨 秦晴 ZHANG Xinxi;WANG Kai;ZHONG Meiying;FENG Chengmin;HU Xiaobing;QIU Gao;LI Jiawei;WANG Chen;QIN Qing(College of Architectural Engineering,Anhui University of Technology,Ma’anshan 243002,China;Nanjing Tech University Pujiang Institute,Nanjing 211200,China)

机构地区：[1]安徽工业大学建筑工程学院,安徽马鞍山243002 [2]南京工业大学浦江学院,江苏南京211200

出　　处：《水资源与水工程学报》2022年第3期115-123,共9页Journal of Water Resources and Water Engineering

基　　金：安徽省自然科学基金项目(202004h07020030)。

摘　　要：针对污水处理过程中进水水质波动问题,在进水质量流量、进水波动周期一定的情况下,采用矩形波为波动类型,通过Fluent软件对水泵强制循环式调质池的调质过程进行数值模拟,分析不同回流比和回流配水管高度对调质池调质效果的影响。结果表明:回流比是影响调质池调质效果的主要因素;随着回流比的增大调质功能系数呈现“先剧增后趋稳”的趋势,在“快速增长区”内,当回流比由0.16增大至1.00时,调质功能系数相应从0.72增长至0.82;进入“缓慢增长区”后,回流比继续增至6.00,则调质功能系数增至0.92,可以得出回流比越大,调质效果越好,但进入“缓慢增长区”后,回流比对调质效果的影响减弱。回流配水管高度的变化对调质池的调质效果无显著影响;当配水管高度在50~350 mm之间变化时,调质功能系数在0.81~0.85之间波动,变化幅度仅为3.7%,回流配水管高度为350 mm时,因回流配水管接近出水口而增强了出水口区域的水体混合和水流流速,调质功能系数相对较大(0.843)。若需提升调质池的调质效果,应优先选择调整回流比,研究成果可为水泵强制循环式调质池的设计与运行提供相应的理论依据。In view of the influent water quality fluctuation in the process of sewage treatment, the rectangular wave was used as the fluctuation type under the condition of certain influent mass flow and influent fluctuation period to simulate the equalization process of the water pump forced water quality equalization basin(WPFWQEB) using Fluent. The equalization function coefficient(y) was introduced to the simulation, and then the effects of different reflux ratios(s) and reflux distribution pipe heights(h) on the equalization effect of the WPFWQEB were analyzed. Results indicated that s was the main factor affecting the equalization effect of the WPFWQEB, with the increase of s, the y showed a trend of “rapid growth followed by stabilization”. Firstly, y increased from 0.72 to 0.82 correspondingly with the increase of s from 0.16 to 1.00 in the “rapid growth area”;then s increased gradually to 6.00 and y to 0.92 correspondingly in the “slow growth area”, indicating that the larger the s value, the better the equalization effect;however, after entering the “slow growth area”, the influence of s on the equalization effect was weakened. Further study revealed that the change of h had no significant effect on the equalization effect of the WPFWQEB, because y merely fluctuated from 0.81 to 0.85 when h varied from 50 to 350 mm, which only accounted for 3.7% of the variation range;However, it was worth noting that when h was set as 350 mm, the water mixing and flow velocity in the outlet area were enhanced because the reflux distribution pipe was close to the outlet, in turn y increased slightly to 0.843. So, if it is necessary to improve the equalization effect of the WPFWQEB, priority should be given to adjusting s. This study could provide a theoretical basis for the design and operation of the WPFWQEB.

关 键 词：水泵强制循环式调质池 调质功能系数 数值模拟 回流比 水质波动 

分 类 号：X703.1[环境科学与工程—环境工程]