What is the first stage of water treatment?
1 Multi-media filter
The main purpose of the multi-media filter is to remove the particles of sediment, manganese, rust, colloidal material, mechanical impurities, suspended solids and other harmful substances in the water.
The effluent turbidity is less than 0.5 NTU, CODMN is less than 1.5 mg/l, iron content is less than 0.05 mg/l, SDI is less than or equal to 5.
The water filter is a kind of "physical chemistry" process, in which the water filtration of granular materials is carried out when the impurities and colloidal suspensions are separated.
2 Second stage pretreatment (Carbon filter)
Activated carbon filters used to remove the pigment in the water, smell, a large number of chemical and biological organisms, reducing the residual value of water and pesticide pollution and other harmful pollutants. The structure of activated carbon filters and quartz sand filters, the difference is placed inside the strong adsorption capacity of activated carbon for removal by the quartz sand filter without the filter out organic material, adsorption of residual chlorine in the water, using water more than less than or equal to chlorine 0.1ML/M3, SDI less than or equal to 4, are strong oxidants chlorine, there are various types of membrane damage, in particular, reverse osmosis membranes are more sensitive to chlorine.