曝气生物滤池反冲洗关键因子的确定及机理浅析  

Mechanism and key factor of combined air and water backwash for BAF

作　　者：凌霄[1] 胡勇有[1] 

机构地区：[1]华南理工大学环境科学与工程学院,广州510640

出　　处：《给水排水》2005年第10期19-23,共5页Water & Wastewater Engineering

基　　金：广州市科技局科技攻关重大项目(2002Z1-E0022)广州市环保局市级污染防治专项资金项目(2000-001)。

摘　　要：通过正交试验得出以粒径为3-6mm和堆积密度为．540kg／m3的陶粒为滤料的下向流曝气生物滤池的最佳气水联合反冲洗操作参数:气反冲洗强度(Qa)为4．88L／(s·m2)、水反冲洗强度(Qw)为1．44L／(s·m2)、气预冲洗时间(Ta)为4min、气水同时反冲洗时间(Ts)为5min和单水反冲洗时间(Tw)为3min。其中水反冲洗强度有显著影响,气反冲洗强度、气水同时反冲洗时间有次要影响,气预冲洗时间、水反冲洗时间有较次影响。得到在最佳反冲洗条件下气、水在滤床中所产生速度梯度(G)分别为203．6s-1、130．2s-1。同时,分析了反冲洗后运行时水头损失和污染物去除的变化规律,并从流体力学角度初步探讨了气水联合反冲洗机理。The backwash of biological aerated filter （BAF） is considered as one of the most important factors in the engineering design. The optimum operating parameters for combined air and water backwash of BAF were chosen with this study by multiple cross experiments. For example, Air and water rate were 4.88 L/（s· m^2） and 1.44 L/（s· m^2 ） respectively; Times of air-backwashing, simultaneously air-water-backwashing and water-backwashing were 4 min, 5 min and 3 min respectively. Water rate of backwash was the most important factor during backwash. The air, water velocity gradient （G） is 203.6 s^-1, 130.2 s^-1 respectively if air and water rate is 4.88 L/（s·m^2） and 1.44 L/（s·m^2） respectively. At the same time, the change of the hydraulic head loss and the quality of water after backwash, backwash mechanism were analyzed.

关 键 词：生物陶粒 曝气生物滤池 气水联合反冲洗 反冲洗机理 流体力学 速度梯度 滤池反冲洗 机理 反冲洗强度 冲洗时间 

分 类 号：TU991.62[建筑科学—市政工程] X703[环境科学与工程—环境工程]