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Conventional water treatment, precipitation is the main unit to remove suspended material in the water, so to study the performance of precipitation, and strengthen its removal, the effluent turbidity can be further reduced to improve water quality. In a variety of precipitation methods, the swash plate (tube) precipitation is an efficient precipitation separation method, and is widely used in the treatment process. Precipitation traditional swash plate (tube) used in small integrated water treatment device affected by the size of the equipment, the installation of traditional swash plate (tube), inevitably there are dead zones, but also in large proportion. For a circular device, this phenomenon is particularly prominent. In order to solve the traditional swash plate (tube) to precipitate this deficiency, the paper design an adaptation of the new round of water treatment equipment swash plate - spiral ramp plate, inclined plate space utilization rate of 100% of \Under the same conditions as in the precipitation zone height, spiral swash plate than the ordinary precipitation area of ??the swash plate is large, so the efficiency of the separation of the mud. In order to examine the performance of this new swash plate precipitation, designed mechanically stirred flocculation with the authentication, and the water treatment method is applied Jialingjiang raw water. The test results show that the inclined plate sedimentation strong adaptability of the Jialing River raw water, the impact load, water quality and stability, better. Test selection of aluminum chloride, polyacrylamide, ferric chloride three coagulation and different dosing amount Experimental research the flocculant dosage obvious impact on water quality. The results show that: the water turbidity 100NTU about, mechanical stirring speed 130r/min aluminum chloride (PAC) dosage of 15 mg / L, turbidity and UV254 removal rate optimal effect. In the winter water turbidity 10NTU, mechanical agitation speed 40r/min, selection of aluminum chloride (PAC) and ferric chloride (Fecl3), aluminum chloride (PAC) dosage of 10 mg / L, chloride The iron (Fecl3) dosage of 15 mg / L, the removal of turbidity and UV254 optimal. To arrive at the distribution of the flow field of the precipitation area, using Fluent software simulation, further investigation of the flow field distribution of the precipitation area. Respectively analog media to clean water and the mixture density and velocity distribution of the flow field situation, in which a mixture of three coagulation water, muddy water and sand water. Only consider the region of the spiral precipitate free precipitated during the simulation. Finally, the spiral inclined plate settling the use of the small towns in the western analysis of technical feasibility and applicability analysis, demonstrate the technical feasibility and economic advantage, for the small towns of the Three Gorges reservoir area has good applicability.
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