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Method for improving dehydration property of sludge in printing and dyeing industry

A technology for dewatering performance and industrial sludge, applied in water/sludge/sewage treatment, sludge treatment, biological sludge treatment, etc., can solve the problems of unsatisfactory sludge dewatering performance and achieve saving chemicals, Effect of reducing treatment cost and reducing sludge volume

Inactive Publication Date: 2019-02-19
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the improvement of sludge dewatering performance mainly includes thermal conditioning, freeze-thaw treatment, high-temperature thermal hydrolysis, adding flocculants to increase floc particles, etc., but the effect of improving sludge dewatering performance is generally not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Anaerobic digestion of the concentrated sludge produced by the treatment of printing and dyeing wastewater, control the digestion process in the hydrolytic acidification stage, so that part of the organic matter in the sludge is hydrolyzed and acidified to produce small molecular organic acids, and the pH of the digestive solution is continuously reduced to 4.5;

[0021] (2) To the sludge after anaerobic digestion, add the amine (or ammonium) of polyacrylate copolymer formed by the copolymerization of soft monomer, hard monomer and acrylic monomer whose glass transition temperature (Tg) is higher than room temperature ) salt, the dosage is 0.2g / g dry sludge, stir and mix quickly and react for 10min, using the H produced by the organic acid ionization produced by hydrolysis acidification + With the added temperature-responsive polyacrylate copolymer—COO — combine, take off—[NR 4 ] + , forming —COOH, and with excess H + Inhibit the ionization of carboxylic acid gro...

Embodiment 2

[0027] (1) Anaerobic digestion of the concentrated sludge produced by the treatment of printing and dyeing wastewater, controlling the digestion process to be in the hydrolysis and acidification stage, so that part of the organic matter in the sludge is hydrolyzed and acidified to produce small molecular organic acids, and the pH of the digestion solution is continuously reduced to 3.75;

[0028] (2) To the sludge after anaerobic digestion, add the amine (or ammonium) of polyacrylate copolymer formed by the copolymerization of soft monomer, hard monomer and acrylic monomer whose glass transition temperature (Tg) is higher than room temperature ) salt, the dosage is 0.4g / g dry sludge, stir and mix quickly and react for 20min, using the H produced by the organic acid ionization produced by hydrolysis acidification + With the added temperature-responsive polyacrylate copolymer—COO — combine, take off—[NR 4 ] + , forming —COOH, and with excess H + Inhibit the ionization of carb...

Embodiment 3

[0034] (1) Anaerobic digestion of the concentrated sludge produced by the treatment of printing and dyeing wastewater, control the digestion process in the hydrolysis and acidification stage, so that part of the organic matter in the sludge is hydrolyzed and acidified to produce small molecular organic acids, so that the pH of the digestion solution is continuously reduced to about 4.1;

[0035] (2) To the sludge after anaerobic digestion, add the amine (or ammonium) of polyacrylate copolymer formed by the copolymerization of soft monomer, hard monomer and acrylic monomer whose glass transition temperature (Tg) is higher than room temperature ) salt, the dosage is 0.3g / g dry sludge, stir and mix quickly and react for 15min, using the H produced by the organic acid ionization produced by hydrolysis acidification + With the added temperature-responsive polyacrylate copolymer—COO — combine, take off—[NR 4 ] + , forming —COOH, and with excess H + Inhibit the ionization of carbo...

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Abstract

The invention discloses a method for improving the dehydration property of sludge in a printing and dyeing industry. The method comprises the following steps: concentrating sludge generated after coagulation of printing and dyeing wastewater and then carrying out hydrolytic acidification on the sludge; adding a polyacrylates copolymer, mixing and then reacting for 10-30 min, fully separating out copolymer molecules and combining the copolymer molecules with sludge particles; heating the sludge to enable a molecular chain of the polyacrylates copolymer to move and curl; insulating for 10-60 min, enabling the molecular chain of the copolymer molecules together with the sludge particles to be agglomerated together, and shrinking and deforming to form pores among the sludge particles; cooling,and supporting the pores among the sludge particles by a three-dimensional network structure formed after hardening of the molecular chain of the copolymer; and filtering and dehydrating the sludge.By the supporting effect of the molecular chain of the hardened copolymer, a water permeable duct during filtering of the sludge is formed, deformation of the duct in a filtering process is prevented,and the filtering and dehydrating performance of the sludge is improved.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment in environmental protection, in particular to a method for improving the dewatering performance of printing and dyeing industrial sludge. Background technique [0002] The dehydration of sludge has always been a worldwide problem, especially the printing and dyeing industrial sludge contains a large amount of organic matter, which has strong hydrophilicity and high bound water content. When dehydration is carried out by solid-liquid separation methods such as dehydration or vacuum dehydration, the dehydration rate is slow, and the moisture content of the mud cake is high. [0003] At present, the improvement of sludge dewatering performance mainly includes thermal conditioning, freeze-thaw treatment, high-temperature thermal hydrolysis, adding flocculants to increase floc particles, etc., but the effect of improving sludge dewatering performance is generally not ideal. Contents of the i...

Claims

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Application Information

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IPC IPC(8): C02F11/04C02F11/147C02F11/121
CPCC02F11/04C02F11/121C02F11/14
Inventor 张宾柳荣展于梦楠石宝龙潘颖于晓位恒张晓东
Owner QINGDAO UNIV
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