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1033results about How to "Reduce retention" patented technology

System for preparing potassium sulfate from high-salt-content industrial wastewater and technology of system

The invention relates to a system for preparing potassium sulfate from high-salt-content industrial wastewater and belongs to the field of water treatment. The high-salt-content industrial wastewater is pretreated through a regulating pool, a pipeline mixer, a high-density precipitate pool, a V-type filter pool, ion exchange resin and an ultrafiltration membrane system and then concentrated through a first section reverse osmosis membrane system and a second section reverse osmosis membrane system and then enters a nanofiltration membrane system for salt separation, nanofiltration produced water and thick water enter a plate-pipe type high-pressure flat sheet membrane system II and a plate-pipe type high-pressure flat sheet membrane system I respectively to be concentrated again, the concentrated thick water enters a freezing crystallization system for crystallization, crystals enter a potassium sulfate preparing system to be converted, freezing mother liquor and the concentrated nanofiltration produced water enter an advanced oxidizing system for oxidation and then enter an evaporative crystallization system for crystallization, and produced sodium sulfate crystal salt enters a potassium sulfate preparing system for conversion. The system has the advantages that the scale of the nanofiltration system is reduced, and investment cost is reduced; salt separation is thorough, and operation cost is low; the purity of the crystallization salt is high; mirabilite and sodium sulfateare converted into potassium sulfate, and the economic value is improved.
Owner:INNER MONGOLIA JIUKE KANGRUI ENVIRONMENTAL TECH

Combined spunlace non-woven fabric for personal hygiene nursing product water absorption surface layer and preparation method of non-woven fabric

The invention relates to the technical field of spunlace non-woven, and discloses a combined spunlace non-woven fabric for a personal hygiene nursing product water absorption surface layer and a preparation method of the non-woven fabric. The spunlace non-woven fabric comprises a first fiber layer and a second fiber layer, the first fiber layer comprises hydrophilic fibers, the second fiber layercomprises hydrophobic fibers, the fibers in the first fiber layer and the second fiber layer are entangled each other, a plurality of projections and a plurality of through holes are distributed on the surface of the first fiber layer, and the through holes penetrate the second fiber layer. The non-woven fabric comprises double-layer fibers with different solution absorption performances, one surface contacting with human skins has hydrophilicity, softness and skin-friendly performance of the fabric cannot be affected, the other surface without contacting with the human skins has hydrophobicity, so that ratio of hydrophilic fibers can be reduced, liquid storage amount of the surface layer is reduced, liquid absorbed by the first fiber layer can rapidly pass the second fiber layer to entera flow guide layer, and dry and comfortable performances of surface layer materials are improved.
Owner:HANGZHOU NBOND NONWOVENS
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