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Method for reducing specific resistance of concentrated sludge

A technology of concentrated sludge and sludge specific resistance, which is applied in dehydration/drying/concentrated sludge treatment, sludge treatment, biological sludge treatment, etc., can solve the problems of unsatisfactory effect and high sludge specific resistance, and achieve Reduce deformation, reduce treatment costs, and reduce the effect of sludge specific resistance

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

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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 flocculant to increase floc particles, etc., but the effect is generally not ideal, and the specific resistance of sludge is still high.

Method used

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  • Method for reducing specific resistance of concentrated sludge
  • Method for reducing specific resistance of concentrated sludge

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Effect test

Embodiment 1

[0021] (1) Concentrate the mixed sludge produced by wastewater treatment to a solid content of more than 5% by air flotation or sedimentation, and perform anaerobic digestion treatment to control the digestion process in the hydrolysis and acidification stage, so that part of the organic matter in the sludge is fermented to produce organic acids, so that The pH of the digestive juice is continuously reduced to 3.87, and the ionization of the organic acid generates hydrogen ions, which inhibit the subsequent ionization of the water-soluble groups of the pH and temperature-responsive polyacrylate polymer copolymer;

[0022] (2) Pump the sludge after anaerobic digestion into the reaction tank, and add soft monomer, hard monomer and acrylic monomer with a glass transition temperature (Tg) of 70°C to the sludge in proportion while stirring The amine (or ammonium) salt of the pH- and temperature-responsive polyacrylate polymer copolymer formed by copolymerization, the dosage is 0.4g / ...

Embodiment 2

[0028] (1) Concentrate the mixed sludge produced by wastewater treatment to a solid content of more than 5% by air flotation or sedimentation, and perform anaerobic digestion treatment to control the digestion process in the hydrolysis and acidification stage, so that part of the organic matter in the sludge is fermented to produce organic acids, so that The pH of the digestive juice is continuously reduced to 4.0, and the ionization of the organic acid generates hydrogen ions, which inhibit the subsequent ionization of the water-soluble groups of the pH and temperature-responsive polyacrylate polymer copolymer;

[0029] (2) Pump the sludge after anaerobic digestion into the reaction tank, and add soft monomer, hard monomer and acrylic monomer with a glass transition temperature (Tg) of 70°C to the sludge in proportion while stirring The amine (or ammonium) salt of the pH- and temperature-responsive polyacrylate polymer copolymer formed by copolymerization, the dosage is 0.3g / g...

Embodiment 3

[0035] (1) Concentrate the mixed sludge produced by wastewater treatment to a solid content of more than 5% by air flotation or sedimentation, and perform anaerobic digestion treatment to control the digestion process in the hydrolysis and acidification stage, so that part of the organic matter in the sludge is fermented to produce organic acids, so that The pH of the digestive juice is continuously reduced to 4.0, and the ionization of the organic acid generates hydrogen ions, which inhibit the subsequent ionization of the water-soluble groups of the pH and temperature-responsive polyacrylate polymer copolymer;

[0036](2) Pump the sludge after anaerobic digestion into the reaction tank, and add soft monomer, hard monomer and acrylic monomer with a glass transition temperature (Tg) of 70°C to the sludge in proportion while stirring The amine (or ammonium) salt of the pH- and temperature-responsive polyacrylate polymer copolymer formed by copolymerization, the dosage is 0.2g / g ...

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Abstract

The invention discloses a method for reducing specific resistance of concentrated sludge. The method includes steps of concentrating sludge until the solid content of the sludge is higher than 5%, carrying out anaerobic digestion treatment, fermenting partial organic matters in the sludge to generate organic acid and continuously lowering the pH (potential of hydrogen) of digestion liquid until the pH of the digestion liquid is lower than 5; pumping the sludge into reaction tanks, adding temperature-responsive polyacrylate copolymers with the glass transition temperatures (Tg) of 40-80 DEG C into the reaction tanks, mixing the sludge and the temperature-responsive polyacrylate copolymers with one another and then carrying out reaction for 10-30 min; carrying out heat exchange on the sludge, then pumping the sludge into heating tanks, heating the sludge and then preserving heat for 10-60 min; cooling the sludge by means of heat exchange until the temperature of the sludge is lower thanthe Tg of the polyacrylate copolymers, quickly hardening the copolymers to form stereoscopic networks, supporting formed pores between sludge granules and forming permeable channels during filter; immediately filtering and dewatering the sludge. The method has the advantage that the specific resistance of the sludge can be reduced under support effects of stereoscopic network frameworks formed bymolecular chains of the hardened polyacrylate copolymers.

Description

technical field [0001] The invention belongs to the technical field of sludge dehydration treatment in environmental protection, and in particular relates to a method for reducing the specific resistance of concentrated sludge. Background technique [0002] Sludge dehydration has always been a worldwide problem, especially industrial wastewater treatment concentrated sludge contains a large amount of organic matter, which has strong hydrophilicity and high bound water content. Plate and frame filter presses, belt dehydrators, vacuum dehydrators, etc. During mechanical 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 flocculant to increase floc particles, etc., but the effect is generally not ideal, and the specific resistance of sludge is still high. Contents...

Claims

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Application Information

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IPC IPC(8): C02F11/04C02F11/147C02F11/13C02F11/121
CPCC02F11/04C02F11/121C02F11/14
Inventor 柳荣展于梦楠于晓
Owner QINGDAO UNIV
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