Numerical Simulation And Experimental Analysis On The Improved Flocculation

In the water treatment process, Hydraulic conditions plays a decisive role in the flocculating collision cohesion, it is necessary to study the force of flocculation water features and explore the efficient flocculation. In the paper the traditional reciprocating baffled flocculation tank was improved by adding the V-shaped perforated baffles, and analyzed the current status and flocculation effect of the improved flocculation using the conducting numerical simulation and coagulation test in different improved programs.The conclusions of this paper are following:(1) In order to increase the turbulence of the water and improve the flocculation, improving the traditional reciprocating baffled flocculation tank was raised in the paper by adding the V-shaped perforated baffles in the corridors, which could be conducive to facilitate construction, low manufacturing cost, ease of maintenance and operation.(2) Computational fluid dynamics software FLUENT was applied to the flow filed analysis in the remarkable flocculation reactor. The velocity distribution, turbulent kinetic energyκ and the turbulent dissipation rate s and other dates of hydraulic characteristics were obtained by numerical simulation. The flow profile could be more reasonable and prevent the water formed in the first corridor by adding the V-shaped perforated baffles. The results,which showed the turbulent kinetic energy and turbulent dissipation rate of flocculation tank of adding120V-shaped baffle in1/3of the corridor was better than others, obtained by numerical simulation of changing the location, different angles and number of the V-shaped baffle were compared with the remarkable flocculation reactor, and then optimized parameters constantly,(3) According to the numerical simulation results, the programs of different angles and different numbers of V-shaped baffle were selected as the programs of experimental research. The equipment of flocculation was designed and fabricated to conduct coagulation test on the condition of maintain a certain chemical factors such as raw water quality, temperature, and dosage. According to turbidity of the tests, the turbulent kinetic energy in the flocculation tank would be greater and the PAC and the raw water would be fully mixed by adding the V-shaped baffle, which was conducive to form larger flocs from the mutual collisions between particles and improve water quality. The results combined of numerical simulation and experiments shows that because of the high turbulent kinetic energy leading floe broken, the program of adding V-shaped baffles in1/3and1/2of the corridor was satisfied, as well as the lowest effluent turbidity.(4) It is proved that the traditional reciprocating baffled flocculation tank was improved by adding the V-shaped perforated baffles was feasible from the results of numerical simulation and experiments. In conditions of no destroying the floe, the corridor number of the improved flocculation tank can be reduced and shorten the length of the flocculation tank. Which was practical significant for the improvement of the flocculation tank.