3, scale inhibitor:
Since the 1970s, there have been two types of water treatment scale inhibitors developed and applied on the basis of introduction and digestion and absorption. One kind is organic phosphonates such as HEDP (hydroxyethylidene diphosphonate), EDTMP Amine tetramethylene phosphonate) and ATMP (aminotrimethylenephosphonate). The other is a polycarboxylic acid such as PAA (polyacrylic acid), HPMA (polymaleic anhydride) and other water-soluble polymers. In the water-soluble polymer or copolymer, there is also a branch, that is, phosphorus-containing polymer.
4, inorganic coagulant:
As a low molecular weight inorganic coagulant, aluminum sulfate, ferrous sulfate and ferric chloride still have a large market in water treatment. Inorganic polymer coagulant is a new type of water treatment agent. In recent years, the rapid development of inorganic coagulants, the main varieties are poly aluminum chloride (PAC), poly aluminum sulfate (PAS), polyferric sulfate (PFS) and polyferric chloride (PFC) several. The first three kinds of stereotypes products, polymerization of ferric chloride is still in the development stage. The development of complex inorganic polymer coagulant is a significant trend in recent years, and many kinds of compound varieties have been developed, such as anionic complex type (such as introduction of SO42- in PAC, introduction of chlorine in PFS, etc.), cationic complex (such as PAC (PAC and polyacrylamide), such as polyferric sulfate, polyaluminum silicate, polyaluminium, poly Phosphorus, polymerization of aluminum and so on.