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水流对混凝沉淀影响研究 【作者】詹咏 【导师】王惠民; 唐洪武

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水流混凝沉淀影响研究

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【作者】詹咏导师王惠民; 唐洪武水利论文Y,R,ZJ/S0q
【作者基本信息】河海大学,环境工程,2001年,博士水利论文 W6P `$O c xB

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【中文摘要】 往复隔板絮凝池因水流结构的影响,延长了絮凝时间,增添了絮凝池容积,严重影响了出水效果。为了解决这些问题,而又要降低改造成本,保持原有絮凝池流程简单实用的优点,需对这种水力絮凝池进行研究。通过现场小试与中试,提出将絮凝池廊道拐弯角设计成圆弧形的改进方案。通过与传统往复隔板絮凝池混凝沉淀效果的对比实验可知改进后的絮凝池能量损失明显减少,反应时间也相应缩短,矾花性状大为改善,出水浊度明显降低。由于平流沉淀池是最直接影响絮凝池流场及混凝沉淀过程的设备,因此,本文对影响平流沉淀池水流结构的最主要因素—异重流的运动特性进行了现场中试研究。此外,由于絮凝池中流场的复杂性,为了进一步了解改进前后的絮凝池水流结构,本文进行了室内实验,采用粒子图象测速技术,对不同方案絮凝池中水流涡漩运动进行了研究;同时建立了二维水流数学模型,对絮凝池流场进行了模拟,并与絮凝池的现场实验及室内实验结果进行了比较。本文的主要研究工作可归纳为: 1、通过混凝沉淀、最佳水力条件测定等现场小试研究,对混凝沉淀过程的机理动力过程等问题进行了研究分析。 2、通过往复隔板絮凝池的模型实验,对所存在的问题提出了改进方案,并以硫酸铝作为混...更多凝剂,根据混凝剂最佳投量的研究成果,对不同工况下两种方案的混凝沉淀效果进行了研究。 3、根据水厂实际进水量及原水水质等实际情况,用硫酸铝作混凝剂,PAM作助凝剂,以改进后的絮凝池为实验对象,并以沉淀池出水处的水质浊度作为混凝沉淀效果的评价指标,建立了进水流量、原水浊度、出水浊度、助凝剂与混凝剂用量的数学模型。 4、对影响混凝沉淀效果最大的水流因素—平流沉淀池中异重流的形成原因进行了讨论,对其流场进行了分析,并对不同方案混凝沉淀效果进行了比较,同时,就减弱异重流的条件进行了讨论。 5、由于往复隔板絮凝池廊道狭窄、絮凝池拐弯水流结构复杂,致使整个流场的量测十分困难。本文应用先进的PIV技术,建立了研究往复隔板絮凝池水流结构的室内测试系统。 6、对往复隔板絮凝池拐弯处水流涡漩运动进行了研究,使用量测系统软件, 内名芍自要对不同工况下水流涡瞒动进行了颁。 7、为了獭整个流场,并对现场实贼室内测试结果进行检测,本文啦了适于往复隔板絮凝池的二维水流数学模型,应用该模型对絮凝池的流场进行了模拟,将计算潍与絮凝池模型实醚果以贩用PIV技术所得室内测试结果进行了比较,结果比较吻合。  还原水利论文@:~6H0b8|aM/b

A_2@o5`.l.H0【英文摘要】 Abstract Because of influence of flow on the reciprocating baffled flocculation tank the flocculating time is prolonged, the volume of flocculation tank is increased. In order to solve these problems, reduce the reform cost and keep easy practical technological process, the present hydraulic flocculation tank must be studied. Using small and middle field tests, the arc design for the corner and baffled section of flocculation tank is presented. By the experiments of coagulative precipitation, it can be seen that for improved flocculation tank energy loss is reduced apparently, and reaction time is shortened correspondingly, and the floc properties are improved greatly, as a result water quality turbidity is decreased apparently. Because horizontal-flow sedimentation basin is a succeeding equipment which affects coagulative precipitation directly, and density flow is one of primary flow factors that will break flow field, density flow characteristics in motion is researched in the middl...更多e field test. In order to understand hydraulic flow patterns for traditional and improved flocculation tanks, the experiments are taken in the laboratory of Hydraulics. Using P1V(Particle Image Velocimetry) technology eddy motion of flow for different flocculation tanks can be studied. Meanwhile two-dimensional numerical model is set up, and flow field of the flocculation tank is simulated, finally the numerical results and the results of field tests and lab experiments are compared. Main results of the dissertation are as follows: 1. Through the small field tests of coagulative precipitation and the optimum hydraulic conditions, the mechanism and dynamic process of coagulation precipitation are studied and analyzed. 2. By means of the model experiments of reciprocating baffled flocculation tank, improved plans for the tank are presented. And using alum as coagulant, based on the results of on the optimum coagulant dose, the coagulative precipitation is researched under different conditions for two plants of the tank. 3. According to the actual inflow quantity and raw water quality of the water plant. using alum as coagulant and PAM as coagulant aids and selecting the outflow water quality turbidity of the sedimentation basin as an assessment factor for coagulative precipitation effect of improved flocculation tank, the numerical model containing several factors such as inflow volume flow rate, raw water turbidity, outflow turbidity, coagulant aid dose and coagulant dose is established. 4. The density flow in horizontal-flow sedimentation basin is discussed, and the flow field is analyzed, the coagulative precipitation effect for different plans are compared, at the same time the measures of abatement of density flow are discussed. 5. Due to narrow gallery and complex hydraulic flow pattern on the corner in the reciprocating baffled flocculation tank, it is very difficult to measure the full flow field. Therefore, using advanced PIN technology a set of system for measuring the hydraulic flow patterns of the reciprocating baffled flocculation tank can be established in the lab. 6. The eddy motion of flow on the corner of the flocculation tank is studied, and the software of the measurement system can be used, in addition the eddy motion flow is analyzed for different predict conditions. 7. In order to predict the full flow field and test the results of experiments, two-dimensional numerical model for  还原水利论文V&h\ u)BF&z

:x6| QNV0【中文关键词】 水流; 混凝沉淀; 往复隔板絮凝池; 边壁形状; 粒子图象测速(PIV); 数值模拟; 平流沉淀池; 异重流
k)h;A/H1hc?x0【英文关键词】 Flow; Coagulative precipitation; Reciprocating baffled flocculation tank; Boundary shape; PIV(Particle image velocimetiy); Numerical simulation; Horizontal-flow sedimentation basin; Density flow

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