Purification effect of nanofiltration technology on Brackish Water

According to the evaluation of China's sanitary standard for drinking water and comprehensive grading standard for drinking water quality of urban and rural residents, the indicators of brackish water, hardness, TDS, sulfate, chloride and fluoride in many provinces of Northwest China have exceeded the safe drinking water standard, and some also contain chromium and arsenic. The chroma and turbidity of brackish water exceed the standard and fluctuate greatly, which can be clearly distinguished. This kind of water also increases the oxygen consumption and total Escherichia coli index of water, which is not conducive to human health.

Nanofiltration is a kind of low pressure reverse osmosis. The pore size of membrane is smaller than that of ultrafiltration and reverse osmosis. It can remove 200-1000 Dalton molecular organic matter, used for decolorization and softening in drinking water purification, remove harmful inorganic salts in water, remove natural organic matter, pyrogen, disinfection by-products, microorganisms and other impurities that affect human health, and can realize the deep purification of drinking water.

Nanofiltration is also an energy-saving water treatment process, which can effectively reduce energy consumption and chemical costs. LD drinking water purification equipment developed by the Ministry of environmental protection adopts sodium NF filtration process. This product adopts highly intelligent control system and does not need to add chemicals. The raw water is purified to meet the WHO drinking water standard, which is adopted by many drinking water safety projects. The above is the introduction of nanofiltration technology