Optimize Experimental Research On The New Processes Of Microsand Flocculation

Sometimes, we may meet the water with the special quality in the water treatment industry, if we deal it with the routine methods; usually it can't reach the standards for the following water treatment plants, and will influence the normal processes of the water treatment plants. One of the raw water that hard to deal is the low temperature, low turbidity water. Normally, we regard the low temperature, low turbidity water as the temperature is 4℃and the turbidity is around 20NTU. The water with this kind quality is more difficult than normal. The high sticky, low thermodynamic activity, low colliding rate, high stability of the colloid and low concentration of the impurity is no good for the granule sedimentation. All of these are harmful to the sedimentation pool and the filter bed, also influence the quality of the water.Flocculation is an important process in the water treatment process, it directly influence the effect of the water treatment project. Along with the pollution in environment, water is worsening and the development of the industry; to make the high rate flocculation is a valuable direction in the modern water-processing technology. The forming of the flocculation nucleus as the key controlling process, can be formed spontaneous by the granules in solution (homogeneous nucleation) or the crystallite that is added outside (heterogeneous nucleation),which is lack in the flocculation process in the modern Water-processing.This research is aimed on a new method to make the high rate flocculation. The property is: add microsand in the process, in order to induce the form of the flocculation and make the flocculation grow up quickly and increase the density of the flocculation.The certain result is the flocculation has a high density and big volume and a fast sedimentation rate.Comparing with the normal method, this method quickens the sedimentation rate of flocculation and shorten the reaction time of flocculation. So the new method can be regarded as the intensity physicochemical water treatment process.The fact of the microsand flocculation is formed by the granule of microsand which is connected by the gravitation between each other, and form flocculation with the various shape and obviously enlarged size. To search the mechanism is to know how environmental factors take part in the process, and then we can provide the academic evidence for the microsand in flocculation; also we can provide some parameters that can be used in the practice.According to the research, the factors that influence the significance of the silicon flocculation are: minute silicon diameter > the adding amount of concrete coagulant > the adding amount of polymer > the adding amount of the microsand. Comparing with the routine flocculation, the effect of the microsand flocculation is better than the routine method in the same medicine dose, and the coagulation rate is highly increased which rise nearly 70% than the routine's. The raw water that using the microsand flocculation method has the low turbidity than the routine's; the less time in the process of concrete and sedimentation; raise the load of the flocculation pool and sedimentation pool, increase the manufacture ability.We can use the shaping fractal theory as the gist to reflect the developing state of the flocculation, and then estimate the process. During the research, we can get different data in various stations, for example, under the different coagulant and polymer dose, or under the different turbidity. So we can summarize the data to get the law of the new method as the routine one.