Technologyoverview

Thistechnology is a treatment process for effectively separating monovalent salts anddivalent salts in solutions by utilizing selective permeability of the nanofiltrationmembrane. Nanofiltration membrane, suitable for desalination, concentration andmany other kinds of processes, is a thin layer composite membrane which can filterout molecules with its weight ranging from 200 to 1000. Separation of inorganicsalts of different particle sizes by nanofiltration membrane has such characteristicsas normal temperature and no destruction, low cost and high yields. It is reportedthat sulfate’s removal rate by nanofiltration membrane is more than 99%, andmagnesium ion’s removal rate is also above 95%. In engineering projects,nanofiltration membrane is frequently used in conjunction with ultrafiltration andreverse osmosis, its location can be either before or after reverse osmosis. Themonovalent and divalent salt solutions obtained after separation andconcentration processes can be further subject to crystallization treatment by athermal method or a freezing crystallization process to obtain high-qualityindustrial salts.

Technicaladvantages

Ø  Can effectively removemonovalent salts and divalent salts (such as sodium chloride and sodium sulfate) in salty wastewater.

Ø  Enable salt separationand concentration processes to be synchronized, and can achieve largerconcentration multiples.

Ø  The separatedmonovalent salt sodium chloride solution can be directly used as ion exchangeregenerant to reduce chemicals consumption

Ø  Compared with otherseparation technologies, operating consumption and investment are relativelylow

Ø  Solved current miscellaneoussalt (dangerous wastes) disposal problems in zero-discharge projects

Ø  Making it possible torecover industrial salt products from zero discharge projects with obviouseconomic benefits

Applicationfields

Suitable for treatinghigh salinity wastewater with salt-separation demands