Purification and treatment of dispersed rural wer supply

2020-06-25 19:37 来源:未知


Currently, Rural water purification treatment, primarily by conventional water treatment methods, i.e., coagulation sedimentation, filtration and disinfection. Centralized water supply facilities in some rural areas is not perfect. Less use of decentralized water supply facilities. Therefore, decentralized water supply of more serious health problems. Household water purifiers in rural areas, farmers are often taken in muddy water natural precipitation method to reduce turbidity, and is safe to drink or boil drinking. Although our farmers drinking habit of boiling water, to reduce the incidence of intestinal infectious diseases played a very good role. However, intestinal infectious diseases remain a major health harm farmers, especially in rural schools, lack of safe drinking water facilities, rural schools often become a major outbreak of intestinal infectious diseases occurred. Turbidity of surface water is generally large, muddy water, organic and inorganic pollution in general are more serious, in addition to natural sedimentation, the effect to accelerate the purification improve the purification, an amount of coagulant is typically added to the water. Alum is the most commonly used coagulant, it has the advantage of small-corrosive, easy to use, good coagulation effect, and no adverse effects on water quality. The disadvantage is the low temperature, slow and loose floc is formed, can be removed by 90% alum precipitation of debris. Attention is required alum no effect sterilization, the main component is aluminum sulfate, alum is added to water, stir, the reaction can bicarbonate and water, a colloidal substance which generates positively charged, they may have been a number of difficult adhesion precipitated, very small particles with negatively charged sink, turbid water became clear. Meanwhile, when settling of small particles with colloidal material, most bacteria adhered to the small particles with sedimentation. Practice has proved that, if alum precipitated, suspended solids can remove 70% to 95%, about 50% -80% reduction of bacteria. This is often misleading, alum think there sterilization effect. In actual fact, no alum active ingredient kill bacteria, the bacteria in the water to reduce the use of alum is only a physical sedimentation of bacteria can survive in the precipitate. Moreover, due to adsorption is not complete, still remain a number of bacteria in the water, and therefore can not replace alum and disinfectant. To use water after coagulation and sedimentation still need chlorination. Groundwater quality is generally good, but some iron and manganese in ground water content is relatively high, there is a high water content of Fe and Mn color, aeration facilities typically employ various groundwater in contact with air, through the oxidation reaction, through the sand filter pool filtration canThe removal of iron and manganese.

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