CN112239318A - Composite conditioner for plate-frame filter-pressing sludge dewatering and preparation technology - Google Patents
Composite conditioner for plate-frame filter-pressing sludge dewatering and preparation technology Download PDFInfo
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- CN112239318A CN112239318A CN202011086162.3A CN202011086162A CN112239318A CN 112239318 A CN112239318 A CN 112239318A CN 202011086162 A CN202011086162 A CN 202011086162A CN 112239318 A CN112239318 A CN 112239318A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
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Abstract
The invention discloses a composite conditioner for plate-and-frame filter-pressing sludge dewatering, which comprises the following raw materials in parts by weight: 15-25 parts of an oxidant, 20-30 parts of chitosan, 30-40 parts of zeolite powder, 25-45 parts of an inorganic flocculant, 80-100 parts of deionized water, 25-40 parts of an inorganic high-valence cation coagulant, 25-30 parts of quick lime and 30-40 parts of inorganic powder fine aggregate, wherein the oxidant is any one or more than two of sodium ferrate, potassium ferrate, sodium percarbonate, sodium hypochlorite, chlorine, sodium dichromate, potassium permanganate and nitric acid. The inorganic flocculant can strongly adsorb colloid particles, and colloid is coagulated through adsorption, bridge frame and crosslinking. The composite conditioner for plate-frame filter-pressing sludge dewatering and the preparation technology thereof have the advantages that the physical and chemical changes are generated, the charges on the surfaces of colloidal particles and suspended matters are neutralized, the potential is reduced, the colloidal particles are changed from the original repulsion to the attraction, and the micelle stability is damaged.
Description
Technical Field
The invention relates to the technical field of sludge dehydration, in particular to a composite conditioner for plate-and-frame filter-pressing sludge dehydration and a preparation technology thereof.
Background
A sludge treatment method is provided for removing water from fluid primary, concentrated or digested sludge and converting the sludge into semi-solid or solid sludge blocks. After dewatering, the water content of the sludge can be reduced to fifty-five percent to eighty percent, depending on the properties of the sludge and the sediments and the efficiency of the dewatering equipment. The further dehydration of the sludge is called sludge drying, and the moisture content of the dried sludge is less than ten percent. The dehydration method mainly comprises a natural drying method, a mechanical dehydration method and a granulation method. The natural drying method and the mechanical dehydration method are suitable for sewage sludge. The granulation method is suitable for coagulating sedimentation sludge.
At present, besides a mechanical dehydration method, a method which is commonly adopted is to condition sludge by one or more chemical agents, thereby changing the properties of sludge particles and facilitating the removal of moisture contained in the sludge. Although the most commonly used sludge dewatering agent has a good sludge dewatering effect, a large amount of the sludge dewatering agent is difficult to degrade under natural conditions, secondary pollution is caused to the environment, and a large amount of organic solvents such as surfactants and the like used in the sludge dewatering agent can also cause pollution to the environment. Meanwhile, the sludge also contains abundant organic matters, a large number of pathogenic bacteria, parasites (eggs), heavy metals, salts and toxic and harmful substances which are difficult to degrade, so that the sludge cannot be effectively conditioned, and the efficiency is low.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a composite conditioner for plate-frame filter-pressing sludge dewatering and a preparation technology thereof, and solves the problem of low efficiency.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a composite conditioner for plate-frame filter-pressing sludge dewatering comprises the following raw materials in parts by weight: 15-25 parts of oxidant, 20-30 parts of chitosan, 30-40 parts of zeolite powder, 25-45 parts of inorganic flocculant, 80-100 parts of deionized water, 25-40 parts of inorganic high-valence cation coagulant, 25-30 parts of quicklime and 30-40 parts of inorganic powder fine aggregate.
Preferably, the oxidant is any one or more than two of sodium ferrate, potassium ferrate, sodium percarbonate, sodium hypochlorite, chlorine, sodium dichromate, potassium permanganate and nitric acid.
Preferably, the inorganic flocculant is one or more of polyaluminium chloride, polyaluminium sulfate, polyferric chloride and polyferric sulfate.
Preferably, 15 parts of oxidant, 20 parts of chitosan, 30 parts of zeolite powder, 25 parts of inorganic flocculant, 80 parts of deionized water, 25 parts of inorganic high-valent cation coagulant, 25 parts of quicklime and 30 parts of inorganic powder fine aggregate.
Preferably, 20 parts of oxidant, 25 parts of chitosan, 35 parts of zeolite powder, 30 parts of inorganic flocculant, 90 parts of deionized water, 37 parts of inorganic high-valent cation coagulant, 27 parts of quicklime and 35 parts of inorganic powder fine aggregate.
Preferably, 25 parts of oxidant, 30 parts of chitosan, 40 parts of zeolite powder, 45 parts of inorganic flocculant, 100 parts of deionized water, 40 parts of inorganic high-valent cation coagulant, 30 parts of quicklime and 40 parts of inorganic powder fine aggregate.
The invention aims to solve another technical problem of providing a composite conditioner for plate-frame filter-pressing sludge dewatering and a preparation technology thereof, wherein the composite conditioner comprises the following steps:
1) adding an inorganic flocculant and an inorganic high-valence cationic coagulant into deionized water according to the Belgium for uniform mixing;
2) adding zeolite powder into the mixed solution obtained in the step 1), and stirring for 24-30 hours at the rotating speed of 400-600 r/min at the temperature of 30-40 ℃ to obtain a mixed solution;
3) adding inorganic powder fine aggregate into the mixed solution obtained in the step 2), and stirring for 24-30 hours at the rotating speed of 400-600 r/min at the temperature of 30-40 ℃ to obtain a mixed solution;
4) slowly adding an oxidant and chitosan into the mixed solution obtained in the step 3), and stirring for 24-40 hours at the rotation speed of 400-600 r/min at the temperature of 20-30 ℃;
5) slowly adding quicklime into the mixed solution obtained in the step 4), and stirring for 24-40 hours at the rotation speed of 400-600 r/min at the temperature of 20-30 ℃;
6) and (3) carrying out centrifugal separation on the mixed liquid obtained in the step 5) to obtain a precipitate, washing the precipitate for 2-3 times by using deionized water, and then carrying out vacuum drying for 1.5-3.5 hours at the temperature of 45-55 ℃ under the condition that the vacuum degree is 0.7-1.1 MPa, so as to obtain the efficient composite conditioner for sludge dewatering.
(III) advantageous effects
Compared with the prior art, the invention provides a composite conditioner for plate-and-frame filter-pressing sludge dewatering and a preparation technology thereof, and the composite conditioner has the following beneficial effects:
1. the composite conditioner for plate-frame filter-pressing sludge dewatering and the preparation technology thereof can strongly adsorb colloid particles through the inorganic flocculant, and the colloid is coagulated through the adsorption, bridge frame and crosslinking action. The chitosan can be used for treating activated sludge, the effect is excellent, the chitosan is non-toxic and biodegradable, the chitosan can be used for treating wastewater and extracting metals, secondary pollution can not be caused, the water quality can be purified through the zeolite powder, the water transfer phenomenon can be relieved, the caking property can be improved, the adsorption effect of a sludge conditioner can be improved, the specific resistance of the sludge can be greatly reduced after the sludge is treated, the mechanical filter pressing dehydration is facilitated, the sludge dehydration efficiency is improved, and the energy consumption of a dehydration process is reduced.
2. The composite conditioner for plate-frame filter-pressing sludge dewatering and the preparation technology thereof lead to the damage and release of loose extracellular polymeric substances through the oxidative cracking action, and reduce the interfacial tension and the adhesion between solid and liquid; meanwhile, based on the sludge conditioning framework theory, the loose sludge conditioner with small particle size destroys and breaks up the aggregation structure of combined extracellular polymers through dispersion and hydrophilic adsorption, a framework seepage channel is constructed in the sludge, so that the combined water is partially released, the combined water and interstitial water are converted to form free water, the water separation is accelerated and promoted, cations and organic pollutants in the sludge are effectively adsorbed through the interaction of chitosan and zeolite powder, and the filtrate is convenient to recycle; meanwhile, the oxidant is added for use in a matching way, so that the acid environment of the sludge is improved, and extracellular polymers forming sludge floc are prevented from being dissolved, thereby being beneficial to the dehydration of the sludge.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows: a composite conditioner for plate-frame filter-pressing sludge dewatering comprises the following raw materials in parts by weight: 15 parts of oxidant, 20 parts of chitosan, 30 parts of zeolite powder, 25 parts of inorganic flocculant, 80 parts of deionized water, 25 parts of inorganic high-valent cation coagulant, 25 parts of quicklime and 30 parts of inorganic powder fine aggregate; the inorganic flocculant and the inorganic high-valence cation coagulant are added into deionized water according to the Belgium and uniformly mixed, the inorganic flocculant can strongly adsorb colloid particles, and the colloid is coagulated through the adsorption, bridge frame and crosslinking action, so that the dehydration speed is increased by the inorganic high-valence cation coagulant. Simultaneously, the physical and chemical changes are generated, the charges on the surfaces of the colloidal particles and the suspended matters are neutralized, the potential is reduced, the original repulsion of the colloidal particles is changed into attraction, the micelle stability is destroyed, and the colloidal particles are mutually collided, so that flocculent coagulating sedimentation is formed; adding zeolite powder into the obtained mixed solution, and stirring at the rotating speed of 400r/min at 30 ℃ for 24 hours to obtain a mixed solution, wherein the zeolite powder can purify water quality, relieve the phenomenon of water transfer, improve the caking property and improve the adsorption effect of the sludge conditioner; adding inorganic powder fine aggregate into the obtained mixed solution, stirring at the rotating speed of 400r/min at the temperature of 30 ℃ for 24 hours to obtain mixed solution, forming a hard grid framework in the sludge, and keeping a porous structure even under the action of high pressure, so that the problem of compressibility of organic matters in the sludge is effectively solved, and the dehydration performance of the sludge is improved; slowly adding an oxidant and chitosan into the obtained mixed solution, stirring for 24 hours at the rotating speed of 400r/min at the temperature of 20 ℃, enabling the product to have high viscosity and good quality by utilizing the chitosan, being used for activated sludge treatment, having excellent effect, and being used for wastewater treatment and metal extraction without causing secondary pollution due to non-toxicity and biodegradability, and reducing the interfacial tension and the adhesiveness between solid and liquid by causing the damage and the release of loose extracellular polymers through oxidative cracking; meanwhile, based on the sludge conditioning framework theory, the loose sludge conditioner with small particle size destroys and breaks up the aggregation structure of combined extracellular polymers through dispersion and hydrophilic adsorption, a framework seepage channel is constructed in the sludge, so that the combined water is partially released, the combined water and interstitial water are converted to form free water, the water separation is accelerated and promoted, cations and organic pollutants in the sludge are effectively adsorbed through the interaction of chitosan and zeolite powder, and the filtrate is convenient to recycle; meanwhile, the oxidant is added for use in a matching way, so that the acid environment of the sludge is improved, and extracellular polymers forming sludge floc are prevented from being dissolved, thereby being beneficial to the dehydration of the sludge; slowly adding quicklime into the obtained mixed solution, stirring at the rotation speed of 400r/min at 20 ℃ for 24 hours to create an alkaline condition, and remarkably improving the dehydration degree; and carrying out centrifugal separation on the obtained mixed solution to obtain a precipitate, washing the precipitate for 2 times by using deionized water, and then carrying out vacuum drying for 1.5 hours at the temperature of 45 ℃ under the condition that the vacuum degree is 0.7MPa to obtain the efficient composite conditioner for sludge dewatering.
Example two: a composite conditioner for plate-frame filter-pressing sludge dewatering comprises the following raw materials in parts by weight: 20 parts of oxidant, 25 parts of chitosan, 35 parts of zeolite powder, 30 parts of inorganic flocculant, 90 parts of deionized water, 37 parts of inorganic high-valent cation coagulant, 27 parts of quicklime and 35 parts of inorganic powder fine aggregate; the inorganic flocculant and the inorganic high-valence cation coagulant are added into deionized water according to the Belgium and uniformly mixed, the inorganic flocculant can strongly adsorb colloid particles, and the colloid is coagulated through the adsorption, bridge frame and crosslinking action, so that the dehydration speed is increased by the inorganic high-valence cation coagulant. Simultaneously, the physical and chemical changes are generated, the charges on the surfaces of the colloidal particles and the suspended matters are neutralized, the potential is reduced, the original repulsion of the colloidal particles is changed into attraction, the micelle stability is destroyed, and the colloidal particles are mutually collided, so that flocculent coagulating sedimentation is formed; adding zeolite powder into the obtained mixed solution, and stirring at 35 ℃ for 27 hours at the rotating speed of 500r/min to obtain mixed solution, wherein the zeolite powder can purify water quality, relieve the phenomenon of water transfer, improve the caking property and improve the adsorption effect of the sludge conditioner; inorganic powder fine aggregate is added into the obtained mixed solution, and the mixed solution is stirred for 27 hours at the rotating speed of 500r/min at the temperature of 35 ℃ to obtain mixed solution, a hard grid framework is formed in the sludge, and the porous structure is still kept even under the action of high pressure, so that the problem of compressibility of organic matters in the sludge is effectively solved, and the dehydration performance of the sludge is improved; slowly adding an oxidant and chitosan into the obtained mixed solution, stirring for 32 hours at the rotating speed of 500r/min at 25 ℃, enabling the product to have high viscosity and good quality by utilizing the chitosan, being used for activated sludge treatment, having excellent effect, and being used for wastewater treatment and metal extraction without causing secondary pollution due to non-toxicity and biodegradability, and reducing the interfacial tension and adhesiveness between solid and liquid due to damage and release of loose extracellular polymers caused by oxidative cracking; meanwhile, based on the sludge conditioning framework theory, the loose sludge conditioner with small particle size destroys and breaks up the aggregation structure of combined extracellular polymers through dispersion and hydrophilic adsorption, a framework seepage channel is constructed in the sludge, so that the combined water is partially released, the combined water and interstitial water are converted to form free water, the water separation is accelerated and promoted, cations and organic pollutants in the sludge are effectively adsorbed through the interaction of chitosan and zeolite powder, and the filtrate is convenient to recycle; meanwhile, the oxidant is added for use in a matching way, so that the acid environment of the sludge is improved, and extracellular polymers forming sludge floc are prevented from being dissolved, thereby being beneficial to the dehydration of the sludge; slowly adding quicklime into the obtained mixed solution, stirring at 25 ℃ for 27 hours at a rotating speed of 500r/min to create an alkaline condition, and remarkably improving the dehydration degree; and carrying out centrifugal separation on the obtained mixed solution to obtain a precipitate, washing the precipitate for 3 times by using deionized water, and then carrying out vacuum drying for 2.5 hours at the temperature of 50 ℃ under the condition that the vacuum degree is 0.9MPa to obtain the efficient composite conditioner for sludge dewatering.
Example three: a composite conditioner for plate-frame filter-pressing sludge dewatering comprises the following raw materials in parts by weight: 25 parts of oxidant, 30 parts of chitosan, 40 parts of zeolite powder, 45 parts of inorganic flocculant, 100 parts of deionized water, 40 parts of inorganic high-valent cation coagulant, 30 parts of quicklime and 40 parts of inorganic powder fine aggregate; the inorganic flocculant and the inorganic high-valence cation coagulant are added into deionized water according to the Belgium and uniformly mixed, the inorganic flocculant can strongly adsorb colloid particles, and the colloid is coagulated through the adsorption, bridge frame and crosslinking action, so that the dehydration speed is increased by the inorganic high-valence cation coagulant. Simultaneously, the physical and chemical changes are generated, the charges on the surfaces of the colloidal particles and the suspended matters are neutralized, the potential is reduced, the original repulsion of the colloidal particles is changed into attraction, the micelle stability is destroyed, and the colloidal particles are mutually collided, so that flocculent coagulating sedimentation is formed; adding zeolite powder into the obtained mixed solution, and stirring for 30 hours at 40 ℃ at the rotating speed of 600r/min to obtain mixed solution, wherein the zeolite powder can purify water quality, relieve the phenomenon of water transfer, improve the caking property and improve the adsorption effect of the sludge conditioner; adding inorganic powder fine aggregate into the obtained mixed solution, stirring for 30 hours at the rotating speed of 600r/min at 40 ℃ to obtain mixed solution, forming a hard grid framework in the sludge, and keeping a porous structure even under the action of high pressure, thereby effectively solving the problem of compressibility of organic matters in the sludge and improving the dehydration performance of the sludge; slowly adding an oxidant and chitosan into the obtained mixed solution, stirring for 40 hours at the rotating speed of 600r/min at the temperature of 30 ℃, enabling the product to have high viscosity and good quality by utilizing the chitosan, being used for activated sludge treatment, having excellent effect, being used for wastewater treatment and metal extraction, not causing secondary pollution due to non-toxicity and biodegradability, and reducing the interfacial tension and the adhesiveness between solid and liquid due to the damage and the release of loose extracellular polymers caused by oxidative cracking; meanwhile, based on the sludge conditioning framework theory, the loose sludge conditioner with small particle size destroys and breaks up the aggregation structure of combined extracellular polymers through dispersion and hydrophilic adsorption, a framework seepage channel is constructed in the sludge, so that the combined water is partially released, the combined water and interstitial water are converted to form free water, the water separation is accelerated and promoted, cations and organic pollutants in the sludge are effectively adsorbed through the interaction of chitosan and zeolite powder, and the filtrate is convenient to recycle; meanwhile, the oxidant is added for use in a matching way, so that the acid environment of the sludge is improved, and extracellular polymers forming sludge floc are prevented from being dissolved, thereby being beneficial to the dehydration of the sludge; slowly adding quicklime into the obtained mixed solution, stirring for 40 hours at the rotation speed of 600r/min at the temperature of 30 ℃, creating an alkaline condition, and remarkably improving the dehydration degree; and carrying out centrifugal separation on the obtained mixed solution to obtain a precipitate, washing the precipitate for 3 times by using deionized water, and then carrying out vacuum drying for 3.5 hours at the temperature of 55 ℃ under the condition that the vacuum degree is 1.1MPa to obtain the efficient composite conditioner for sludge dewatering.
In summary, the following steps: the best effect in the second embodiment is achieved by using 20 parts of oxidant, 25 parts of chitosan, 35 parts of zeolite powder, 30 parts of inorganic flocculant, 90 parts of deionized water, 37 parts of inorganic high-valent cation coagulant, 27 parts of quicklime and 35 parts of inorganic powder fine aggregate; the inorganic flocculant and the inorganic high-valence cation coagulant are added into deionized water according to the Belgium and uniformly mixed, the inorganic flocculant can strongly adsorb colloid particles, and the colloid is coagulated through the adsorption, bridge frame and crosslinking action, so that the dehydration speed is increased by the inorganic high-valence cation coagulant. Simultaneously, the physical and chemical changes are generated, the charges on the surfaces of the colloidal particles and the suspended matters are neutralized, the potential is reduced, the original repulsion of the colloidal particles is changed into attraction, the micelle stability is destroyed, and the colloidal particles are mutually collided, so that flocculent coagulating sedimentation is formed; adding zeolite powder into the obtained mixed solution, and stirring at 35 ℃ for 27 hours at the rotating speed of 500r/min to obtain mixed solution, wherein the zeolite powder can purify water quality, relieve the phenomenon of water transfer, improve the caking property and improve the adsorption effect of the sludge conditioner; inorganic powder fine aggregate is added into the obtained mixed solution, and the mixed solution is stirred for 27 hours at the rotating speed of 500r/min at the temperature of 35 ℃ to obtain mixed solution, a hard grid framework is formed in the sludge, and the porous structure is still kept even under the action of high pressure, so that the problem of compressibility of organic matters in the sludge is effectively solved, and the dehydration performance of the sludge is improved; slowly adding an oxidant and chitosan into the obtained mixed solution, stirring for 32 hours at the rotating speed of 500r/min at 25 ℃, enabling the product to have high viscosity and good quality by utilizing the chitosan, being used for activated sludge treatment, having excellent effect, and being used for wastewater treatment and metal extraction without causing secondary pollution due to non-toxicity and biodegradability, and reducing the interfacial tension and adhesiveness between solid and liquid due to damage and release of loose extracellular polymers caused by oxidative cracking; meanwhile, based on the sludge conditioning framework theory, the loose sludge conditioner with small particle size destroys and breaks up the aggregation structure of combined extracellular polymers through dispersion and hydrophilic adsorption, a framework seepage channel is constructed in the sludge, so that the combined water is partially released, the combined water and interstitial water are converted to form free water, the water separation is accelerated and promoted, cations and organic pollutants in the sludge are effectively adsorbed through the interaction of chitosan and zeolite powder, and the filtrate is convenient to recycle; meanwhile, the oxidant is added for use in a matching way, so that the acid environment of the sludge is improved, and extracellular polymers forming sludge floc are prevented from being dissolved, thereby being beneficial to the dehydration of the sludge; slowly adding quicklime into the obtained mixed solution, stirring at 25 ℃ for 27 hours at a rotating speed of 500r/min to create an alkaline condition, and remarkably improving the dehydration degree; centrifuging the obtained mixed solution to obtain a precipitate, washing the precipitate for 3 times by using deionized water, and then drying the precipitate for 2.5 hours in vacuum at 50 ℃ under the condition that the vacuum degree is 0.9MPa to obtain the efficient composite conditioner for sludge dehydration;
although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The composite conditioner for plate-and-frame filter-pressing sludge dewatering is characterized by comprising the following raw materials in parts by weight: 15-25 parts of oxidant, 20-30 parts of chitosan, 30-40 parts of zeolite powder, 25-45 parts of inorganic flocculant, 80-100 parts of deionized water, 25-40 parts of inorganic high-valence cation coagulant, 25-30 parts of quicklime and 30-40 parts of inorganic powder fine aggregate.
2. The composite conditioner for plate-and-frame filter-pressing sludge dewatering according to claim 1, wherein the oxidant is any one or more than two of sodium ferrate, potassium ferrate, sodium percarbonate, sodium hypochlorite, chlorine, sodium dichromate, potassium permanganate and nitric acid.
3. The composite conditioner for plate-and-frame filter-pressing sludge dewatering according to claim 1, wherein the inorganic flocculant is one or more of polyaluminium chloride, polyaluminium sulfate, polyferric chloride and polyferric sulfate.
4. The composite conditioner for plate-and-frame filter-pressing sludge dewatering according to claim 1, characterized by comprising the following raw materials in parts by weight: 15 parts of oxidant, 20 parts of chitosan, 30 parts of zeolite powder, 25 parts of inorganic flocculant, 80 parts of deionized water, 25 parts of inorganic high-valence cation coagulant, 25 parts of quicklime and 30 parts of inorganic powder fine aggregate.
5. The composite conditioner for plate-and-frame filter-pressing sludge dewatering according to claim 1, characterized by comprising the following raw materials in parts by weight: 20 parts of oxidant, 25 parts of chitosan, 35 parts of zeolite powder, 30 parts of inorganic flocculant, 90 parts of deionized water, 37 parts of inorganic high-valent cation coagulant, 27 parts of quicklime and 35 parts of inorganic powder fine aggregate.
6. The composite conditioner for plate-and-frame filter-pressing sludge dewatering according to claim 1, characterized by comprising the following raw materials in parts by weight: 25 parts of oxidant, 30 parts of chitosan, 40 parts of zeolite powder, 45 parts of inorganic flocculant, 100 parts of deionized water, 40 parts of inorganic high-valent cation coagulant, 30 parts of quicklime and 40 parts of inorganic powder fine aggregate.
7. A composite conditioner for plate-frame filter-pressing sludge dehydration and a preparation technology thereof are provided, and the composite conditioner for plate-frame filter-pressing sludge dehydration is characterized by comprising the following steps:
1) adding an inorganic flocculant and an inorganic high-valence cationic coagulant into deionized water according to the Belgium for uniform mixing;
2) adding zeolite powder into the mixed solution obtained in the step 1), and stirring for 24-30 hours at the rotating speed of 400-600 r/min at the temperature of 30-40 ℃ to obtain a mixed solution;
3) adding inorganic powder fine aggregate into the mixed solution obtained in the step 2), and stirring for 24-30 hours at the rotating speed of 400-600 r/min at the temperature of 30-40 ℃ to obtain a mixed solution;
4) slowly adding an oxidant and chitosan into the mixed solution obtained in the step 3), and stirring for 24-40 hours at the rotation speed of 400-600 r/min at the temperature of 20-30 ℃;
5) slowly adding quicklime into the mixed solution obtained in the step 4), and stirring for 24-40 hours at the rotation speed of 400-600 r/min at the temperature of 20-30 ℃;
6) and (3) carrying out centrifugal separation on the mixed liquid obtained in the step 5) to obtain a precipitate, washing the precipitate for 2-3 times by using deionized water, and then carrying out vacuum drying for 1.5-3.5 hours at the temperature of 45-55 ℃ under the condition that the vacuum degree is 0.7-1.1 MPa, so as to obtain the efficient composite conditioner for sludge dewatering.
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| CN114538745A (en) * | 2022-03-24 | 2022-05-27 | 广东卓信环境科技股份有限公司 | Sludge conditioner and sludge dewatering method |
| CN114804956A (en) * | 2022-05-11 | 2022-07-29 | 厦门旺鑫淼资源化利用有限公司 | Method for producing forestry controlled release fertilizer by using sludge of municipal sewage plant |
| CN115010344A (en) * | 2022-06-24 | 2022-09-06 | 昭仕（厦门）新材料有限公司 | Sludge dehydrating agent and application method thereof in sludge dehydrating |
| CN115745334A (en) * | 2022-11-24 | 2023-03-07 | 中国科学院西北生态环境资源研究院 | Sludge deodorization conditioner and sludge deodorization stabilization treatment method |
| CN115888574A (en) * | 2022-12-05 | 2023-04-04 | 成都理工大学 | Method for preparing sodium percarbonate-chitosan sustained-release microspheres by emulsification-chemical crosslinking method |
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| CN107686225A (en) * | 2017-09-05 | 2018-02-13 | 神美科技有限公司 | A kind of compound type sludge conditioner for sludge dewatering |
| CN110217956A (en) * | 2019-06-19 | 2019-09-10 | 武汉市城市排水发展有限公司 | For the stabilized combination conditioner of deeply dehydrating sludge collaboration mud cake and application |
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