The working principle and application field of sand filter
Sand and gravel filter is a filter material that uses gravel as a filler. Conducive to removing impurities in the water. It has the advantages of low filtration resistance, large specific surface area, strong acid and alkali resistance, and good pollution resistance. The unique advantage of sand filter equipment lies in the optimization of filter material and filter design. The adaptive operation of the filter is realized. The filter material has strong adaptability to the raw water concentration, operating conditions, pre-treatment process, etc. That is to say, the filter bed automatically forms a state of sparse top and bottom density during filtration. It is beneficial to ensure the quality of effluent water under various operating conditions. The filter material is fully dispersed during backwashing, and the cleaning effect is good.
The sand filter can effectively remove the suspended solids in the water, and has an obvious removal effect on colloids, iron, organic matter, pesticides, manganese, bacteria, viruses and other pollutants in the water. And it has the advantages of fast filtering speed, high filtering precision, large dirt interception capacity and so on. Mainly used in various fields such as electricity, electronics, beverages, tap water, petroleum, chemical industry, metallurgy, textile, papermaking, food, swimming pool, municipal engineering and so on.
The sand filter equipment has a simple structure and can realize automatic control in operation. It has the characteristics of large processing flow, few backflushing times, high filtration efficiency, low resistance, and convenient operation and maintenance.