机械絮凝池组合式搅拌器在污水处理中的应用  

Application of combined agitator in mechanical flocculation tank on wastewater treatment

作　　者：姬晓羽 黄博 肖敏 高少华 冯振鹏 Ji Xiaoyu;Huang Bo;Xiao Min;Gao Shaohua;Feng Zhenpeng(WISDRI Urban Design and Construction Company,Wuhan Hubei 430000,China;WISDRI Engineering Research Inc.Ltd.,Wuhan Hubei 430000,China)

机构地区：[1]中冶南方城市建设工程技术有限公司,湖北武汉430000 [2]中冶南方工程技术有限公司,湖北武汉430000

出　　处：《山西建筑》2024年第23期142-145,共4页Shanxi Architecture

基　　金：中冶集团非钢领域重大研发项目(编号:2342B05S28)。

摘　　要：武汉某临时污水处理站采用“机械絮凝池+高密度沉淀池”作为物化处理单元,因占地面积限制,机械絮凝池池深较深,在实际运行过程中发现底部存在死水区,物化处理效果受到影响。为此,采用直叶式和涡轮式桨叶组合式搅拌器对机械絮凝池进行改造。通过计算流体力学(CFD)模拟验证了组合式搅拌器可有效降低絮凝池内弱流区和死水区,模拟结果显示该搅拌器较原搅拌器输入功率增大2.00%,循环时间可降低10.41%,流场的整体平均合速度v、湍动能k和湍动耗散率ε均有所提高,混凝得到了促进、流场得到了改善。在实际运行中,改造后,高密度沉淀池出水SS和COD_(Mn)去除率分别提升至63.5%和34.5%,组合式搅拌器能够有效提升出水水质,改善污水处理效果。A temporary wastewater treatment station in Wuhan employs“mechanical flocculation tank+high-density sedimentation tank”system as the physicochemical treatment unit.Constrained by limited floor space,the mechanical flocculation tank is designed with a relatively deep profile.During actual operation,it was discovered that dead zones emerged at the bottom,adversely affecting the physicochemical treatment efficiency.The Computational Fluid Dynamics(CFD)simulations,has been verified that the combined mixer can effectively reduce the regions of low flow and stagnant water within the flocculation tank,which shows the input power of the mixer increased by 2.00%,the circulation time decreased by 10.41%,and the overall average resultant velocity(v),turbulent kinetic energy(k),and turbulent dissipation rate(ε)of the flow field were all enhanced,and facilitated the coagulation process.In actual operation,after the optimization,the removal rates of suspended solids(SS)and chemical oxygen demand using potassium permanganate(COD_(Mn))in the effluent from the high-density sedimentation tank increased to 63.5%and 34.5%,respectively.The combined mixer effectively enhances the quality of the efflue nt and improves the efficiency of wastewater treatment.

关 键 词：机械絮凝池 搅拌器 优化改造 计算流体力学(CFD) 应用分析 

分 类 号：TU992.3[建筑科学—市政工程]