Extraction and utilization method for pollutants in black printing waste water

A technology for printing waste water and pollutants, applied in water pollutants, chemical instruments and methods, flotation water/sewage treatment, etc., can solve problems such as secondary pollution and inability to realize resource utilization

Active Publication Date: 2017-01-11
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sludge generated from mud-water separation is mechanically press-filtered or centrifugally dewatered to form a mud cake as solid waste for landfill treatment, which is likely to cause secondary pollution and cannot be utilized as a resource

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Add 40% sulfuric acid to the black plastic printing wastewater, stir for 15 minutes to condense the pollutants, and use the sedimentation method to separate the mud and water; add 5g / L 300-500 mesh calcium ore powder to the separated sludge, stir After uniformity, heat the sludge to 85°C for dehydration while stirring to make the sludge form lumps; take out the lumpy sludge and hot press until the moisture content is lower than 30%, and then dry it at 100°C; heat the dried sludge to Keep warm at 500°C for 2 hours; cool down the sludge below 50°C and break it into granules, and evenly spray a wetting agent solution with a mass concentration of 0.1%; add the sludge granules to the blue cationic dye dyeing wastewater at a dosage of 5g / L , Aeration and stirring for 20 minutes, sedimentation and removal of sludge particles, the decolorization rate of blue cationic dyed wastewater is 99.8%. After the sludge particles are recovered and regenerated, they can be recycled.

Embodiment 2

[0014] Add 40% hydrochloric acid to the black plastic printing wastewater, stir for 20 minutes to make the pollutants condense, and use the sedimentation method to separate the mud and water; add 5g / L 300-500 mesh calcium ore powder to the separated sludge, stir After uniformity, heat the sludge to 83°C for dehydration while stirring to make the sludge form lumps; take out the lumpy sludge and hot press until the moisture content is lower than 30% and then dry it at 100°C; heat the dried sludge to Keep warm at 600°C for 1 hour; cool down the sludge below 50°C and break it into granules, and evenly spray a wetting agent solution with a mass concentration of 0.1%; add the sludge granules to the wastewater dyed with red cationic dyes at an amount of 8g / L. After aeration and stirring for 60 minutes, the sludge particles were precipitated and removed, and the decolorization rate of red cationic dyed wastewater was 99.6%. After the sludge particles are recovered and regenerated, the...

Embodiment 3

[0016] Add 40% sulfuric acid to the black plastic printing wastewater, stir for 15 minutes to condense the pollutants, and use the sedimentation method to separate the mud and water; add 8g / L 300-500 mesh calcium ore powder to the separated sludge, stir After uniformity, heat the sludge to 80°C for dehydration while stirring to make the sludge form lumps; take out the lumpy sludge and hot press until the moisture content is lower than 30%, and then dry it at 100°C; heat the dried sludge to Keep warm at 550°C for 2 hours; cool down the sludge below 50°C and break it into granules, and evenly spray a wetting agent solution with a mass concentration of 0.15%; add the sludge granules to the wastewater dyed with yellow cationic dyes at a dosage of 6g / L. After aeration and stirring for 50 minutes, sludge particles were precipitated and removed, and the decolorization rate of yellow cationic dyed wastewater was 99.50%. After the sludge particles are recovered and regenerated, they ca...

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Abstract

The invention discloses an extraction and utilization method for pollutants in black printing waste water, comprising the following steps: adding acid to the black plastic printing waste water, stirring the waste water for 10-30min to coagulate the pollutants, and carrying out mud water separation by an air flotation method or precipitation method; adding calcium mineral powder to the separated sludge, and after stirring uniformly, carrying out thermal dehydration on the sludge while stirring the sludge to form sludge blocks; taking out the sludge blocks, thermally pressing the sludge until the water content is below 30% and baking the sludge; heating the baked sludge to 400-700 DEG C under an air-free condition and insulating for 1-5h; cooling the sludge to below 50 DEG C, crushing and granulating the sludge, and uniformly sprinkling a wetting agent solution with mass concentration of 0.05-0.2%; adding sludge particles into cationic dye waste water, aerating and stirring the waste water for 10-60 min, and then precipitating or filtering waste water to remove the sludge particles to obtain almost colorless waste water; and recovering the sludge particles and carrying out heat regeneration at 400-700 DEG C for recycling. The extraction and utilization method for pollutants in black printing waste water realizes extraction of pollutants in the black printing waste water and reclamation and utilization of solid waste, and the decoloring rate of the cationic dye waste water is approximately 100%.

Description

technical field [0001] The invention belongs to the technical field of environmental protection engineering, in particular to a method for extracting and utilizing black plastic printing wastewater pollutants. Background technique [0002] At present, a large number of plastic packaging (waterproof) materials are increasingly using water-based inks when printing, and a certain amount of printing wastewater is produced during the production process. This kind of wastewater contains pollutants such as pigments and water-soluble resins, and its organic content is high. Usually, the COD of wastewater Cr : 5000-30000 mg / L; Chromaticity: 5000-20000 times. The biodegradability of wastewater is poor, the pollution is extremely serious, and it is difficult to treat. [0003] For the treatment of this kind of wastewater, the separation method is usually used for pretreatment, such as coagulation sedimentation or coagulation air flotation method. The solid-liquid separation method r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F11/12
CPCC02F1/24C02F1/52C02F11/12C02F2001/007C02F2101/308
Inventor 柳荣展张宾邹译慧潘颖石宝龙于梦楠
Owner QINGDAO UNIV
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