Synchronous decoloring and nitrogen recovery method for printing wastewater
A technology of printing wastewater and recycling method, applied in the field of textile printing and dyeing industry, can solve the problems of secondary pollution, inability to reduce the ammonia nitrogen content of wastewater, etc.
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Embodiment 1
[0012] Add hydrogen type strongly acidic cation exchange resin to blue printing wastewater (COD Cr : 16200mg / L; Chromaticity: 5000 times; Ammonia nitrogen: 327mg / L), stirring reaction for 60min; separate cation exchange resin precipitation from waste water; use precipitation method to separate suspended matter in waste water from waste water; Treated with 10% hydrochloric acid solution to form [R 3 NH] + Cl - Ammonia nitrogen is recovered and the resin is regenerated at the same time; the regenerated hydrogen-type strongly acidic cation exchange resin is added to the printing wastewater for recycling.
[0013] Adopt the method of the present invention to handle, and the decolorization rate of this kind of printing waste water is up to 99.8%, and the removal rate of ammonia nitrogen reaches 90.4%, and COD Cr The removal rate reaches 92.3%, realizing simultaneous decolorization of wastewater and recovery of nitrogen, without significantly increasing the concentration of chlor...
Embodiment 2
[0015] The sodium-type strongly acidic cation exchange resin is pretreated and replaced with a hydrochloric acid solution with a mass concentration of 10%, and then added to the blue printing wastewater (COD Cr : 16200mg / L; Chromaticity: 5000 times; Ammonia nitrogen: 327mg / L), stirring reaction for 60min; separate cation exchange resin precipitation from waste water; use precipitation method to separate suspended matter in waste water from waste water; Treated with 10% hydrochloric acid solution to form [R 3 NH] + Cl - Ammonia nitrogen is recovered and the resin is regenerated at the same time; the regenerated strong acidic cation exchange resin is added to the printing wastewater for recycling.
[0016] Adopt the method of the present invention to handle, and the decolorization rate of this kind of printing waste water is up to 99.8%, and the removal rate of ammonia nitrogen reaches 90.1%, and COD Cr The removal rate reaches 92.2%, realizing simultaneous decolorization of ...
Embodiment 3
[0018] Add hydrogen type strongly acidic cation exchange resin to black printing wastewater (COD Cr : 17800mg / L; Chromaticity: 6000 times; Ammonia nitrogen: 351mg / L), stirring reaction for 180min; separate cation exchange resin precipitation from wastewater; use precipitation method to separate suspended solids in wastewater from wastewater; precipitate cation exchange resin Treat with a sulfuric acid solution with a mass concentration of 4% to form (R 3 NH + ) 2 SO 4 2- The ammonia nitrogen is recovered and the resin is regenerated at the same time; the regenerated cation exchange resin is added to the printing wastewater for recycling.
[0019] Adopt the method of the present invention to process, and the decolorization rate of this kind of water-based ink printing waste water is up to 100%, and the removal rate of ammonia nitrogen reaches 89.6%, and COD Cr The removal rate reaches 93.1%, realizing simultaneous decolorization of wastewater and recovery of nitrogen, with...
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