CN111675467A - Pretreatment process for sludge carbonization - Google Patents
Pretreatment process for sludge carbonization Download PDFInfo
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- CN111675467A CN111675467A CN202010554232.7A CN202010554232A CN111675467A CN 111675467 A CN111675467 A CN 111675467A CN 202010554232 A CN202010554232 A CN 202010554232A CN 111675467 A CN111675467 A CN 111675467A
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- sludge
- carbonization
- pretreatment process
- polymeric
- aluminum
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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
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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
- C02F11/006—Electrochemical treatment, e.g. electro-oxidation or electro-osmosis
-
- 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
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
-
- 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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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
Abstract
The invention provides a pretreatment process for sludge carbonization, which relates to the technical field of sludge regeneration treatment and comprises the steps of crushing, conditioning, screening, cavitation, wall breaking and preheating, wherein particles of sludge before the carbonization step are screened, impurities are screened, a macromolecular structure is decomposed into a micromolecular structure, and cell walls of cells are completely destroyed. The invention adopts the steps of crushing, tempering, screening, cavitation and wall breaking, solves the technical problem that the macromolecular structure and the cell wall of the cell in the sludge are not thoroughly destroyed because the sludge directly enters the carbonization step without pretreatment, and ensures that the components of the sludge are more exquisite and uniform after the sludge is pretreated before carbonization, thereby being beneficial to the subsequent carbonization process.
Description
Technical Field
The invention relates to the technical field of sludge regeneration treatment, in particular to a pretreatment process for sludge carbonization.
Background
Domestic sludge is the end product of the urban domestic sewage treatment process, and the existing sewage treatment technology transfers a large amount of pollutants in sewage into sludge through the metabolism of microorganisms and a physical and chemical method so as to achieve the aim of purifying water quality. The essence of water treatment is phase transfer of part of pollutants, and when water quality is purified, a large amount of soluble pollutants are changed into insoluble solids which are separated as sludge, and the sludge is generally rich in organic matters, germs and the like and can be said to be concentrated pollutants. After being taken out from a water treatment plant, the domestic sludge is generally incinerated, buried or piled up, and other methods cannot treat the domestic sludge. The landfill method not only occupies a large amount of land, but also can cause pollutants to be finally immersed into the ground, causes secondary pollution to soil, underground water and the like, and is unfavorable for the environment; although the incineration can achieve harmless treatment and resource utilization, the whole technical level in China is low, a large amount of smoke is formed, and the environment is polluted. At present, urban construction is accelerated, the demand of building materials is increased, and particularly, the building bricks which are widely applied are all fired by adopting shale at present, and a large amount of shale is required to be used as raw materials for manufacturing the building materials, so that people begin to utilize sludge obtained by sewage treatment to prepare the building bricks at present.
However, the existing technology for preparing bricks by sludge is still not mature, and the sludge is not pretreated and directly enters the carbonization step, so that macromolecular structures and cell walls of cells in the sludge are not thoroughly damaged, the preparation work for carbonizing the sludge is insufficient, and the carbonization effect is not ideal.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a pretreatment process for sludge carbonization, which solves the technical problem that the macromolecular structure and cell walls of cells in sludge are not thoroughly destroyed because the sludge directly enters a carbonization step without being pretreated in the prior art.
According to an embodiment of the invention, the pretreatment process for sludge carbonization comprises the following steps:
s1, feeding the sludge into a storage bin, and conveying the sludge to a crusher through an even feeder to refine and crush the original sludge;
s2, conveying the crushed sludge to a conditioning tank by a screw, conditioning and homogenizing the sludge, wherein the conditioning step is to add 5-10% of quicklime, 2-4% of ferric salt and/or aluminum salt, 5-8% of cationic organic high molecular polymer, 1-3% of curing agent and 1-3% of flocculating agent into the sludge according to the absolute dry mass of the sludge, and the homogenizing treatment is to stir continuously in the conditioning tank;
s3, conveying the tempered sludge to a filter by using a hose pump, and screening and cleaning impurities in the sludge;
s4, feeding the screened sludge into a spiral cavitator to destroy the molecular structure in the sludge;
s5, the sludge passes through high-voltage electronic pulse equipment, and the high-voltage pulse current is utilized to generate a cracking effect on cell walls of biological cells in the sludge, so that the cell walls are completely broken;
and S6, conveying the sludge subjected to wall breaking to a preheating tank through a rotor pump, and butting the sludge with a subsequent carbonization system.
Through adopting above-mentioned technical scheme, mud will pass through the steps of breakage, quenching and tempering, screening, cavitation, broken wall, preheating before getting into the carbonization step, makes the granule of mud before the carbonization step pass through the screening, and impurity is through screening out, and macromolecular structure decomposes into the small molecule structure, and the cell wall of cell is destroyed completely, consequently to subsequent carbonization step, its carbonization raw materials quality obtains improving, and it is more exquisite stability that the carbon base particulate matter that the carbonization obtained, and the carbonization quality obtains improving.
Preferably, in the step S1, the crusher is a double roll crusher, and the large-particle sludge is crushed to a particle diameter of less than 100 μm.
Through adopting above-mentioned technical scheme, it is outstanding to roller crusher's crushing effect, can be less than 100 microns with large granule mud breakage to particle diameter, prevent that large granule mud impurity from directly getting into the carbonization system not broken, lead to the gained carbon base particulate matter size nonconformity after the carbonization.
Preferably, in step S2, the iron salt includes one of ferric chloride, ferric sulfate, ferrous sulfate, polymeric ferric chloride, polymeric ferric sulfate, polymeric ferric chloride sulfate, polymeric ferric phosphate, and polymeric alumino-silicate, the aluminum salt includes one of aluminum sulfate, sodium aluminate, alum, polymeric aluminum chloride, polymeric aluminum sulfate, and polymeric aluminum phosphate, the curing agent includes aromatic acid anhydride or aliphatic acid anhydride, and the cationic organic high molecular polymer includes one of polydimethyldiallylammonium chloride, polyalphalamine epoxide, cationic polyacrylamide, polyvinylamine, polyethyleneimine, and polydimethylaminopropylmethacrylamide.
Through adopting above-mentioned technical scheme, molysite and aluminium salt can produce iron ion and aluminium ion in aquatic electrolysis, and quick lime reacts in aqueous calcium hydroxide, and calcium hydroxide produces iron hydroxide and aluminium hydroxide with iron ion and aluminium ion, can get rid of the suspended impurity in the mud, and positive ion organic high molecular polymer can play the flocculation effect, makes the mud concentrate, reduces the volume of mud by a wide margin, and the curing agent can make the molecule cross-linking shaping in the mud after the concentration.
Preferably, in step S3, the filter is a vibration filter, and the vibration frequency is 3000-5000 hz.
Through adopting above-mentioned technical scheme, through the screening of vibration filter with lighter flocculation material in the mud.
Preferably, in the step S4, the spiral cavitator generates a blasting impact under the action of the acoustic vibration and the acoustic magnetic field to generate local high-temperature and high-speed microjet, so that chemical bonds in crude oil molecules in the sludge are broken, macromolecular chains are converted into small molecular chains, and an association structure between colloid and asphaltene units in the sludge is destroyed, thereby promoting the colloid and the asphaltene to be converted into small molecular substances.
By adopting the technical scheme, the energy generated instantly under the action of the acoustic vibration and the acoustic magnetic field is large, and the large molecular chain substances in the sludge are quickly and thoroughly damaged.
Preferably, in step S5, the high voltage pulse current is a rectangular wave pulse with a voltage of 100-.
By adopting the technical scheme, the high-voltage pulse current can puncture the cell walls of organisms in the sludge, so that the biological cells remained in the sludge are completely destroyed and decomposed.
Preferably, in the step S6, the temperature in the preheating tank is maintained at 50 to 60 degrees celsius.
By adopting the technical scheme, the temperature in the preheating tank is always kept at 50-60 ℃, so that the heating time of the sludge after entering the carbonization step can be saved, and the efficiency of sludge carbonization is accelerated.
Compared with the prior art, the invention has the following beneficial effects: by adopting the steps of crushing, tempering, screening, cavitation and wall breaking, the technical problem that the macromolecular structure and cell walls of cells in the sludge are not thoroughly destroyed because the sludge is not pretreated and directly enters the carbonization step is solved, and after the sludge is pretreated before carbonization, the components of the sludge are more fine and uniform, which is beneficial to subsequent carbonization process.
Detailed Description
The technical solution of the present invention is further illustrated by the following examples.
The embodiment of the invention provides a pretreatment process for sludge carbonization, which comprises the following steps:
s1, feeding the sludge into a storage bin, and conveying the sludge to a crusher through an even feeder to refine and crush the original sludge;
s2, conveying the crushed sludge to a conditioning tank by using a screw, conditioning and homogenizing the sludge, wherein the conditioning step is to respectively add 5% of quicklime, 2% of ferric salt, 5% of cationic organic high molecular polymer, 1% of curing agent and 1% of flocculating agent into the sludge according to the absolute dry mass of the sludge, and the homogenizing treatment is to continuously stir in the conditioning tank;
s3, conveying the tempered sludge to a filter by using a hose pump, and screening and cleaning impurities in the sludge;
s4, feeding the screened sludge into a spiral cavitator to destroy the molecular structure in the sludge;
s5, the sludge passes through high-voltage electronic pulse equipment, and the high-voltage pulse current is used for generating a cracking effect on the sludge cell walls, so that the walls of the sludge cell walls are completely broken;
s6, conveying the sludge subjected to wall breaking to a preheating tank through a rotor pump and butting with a subsequent carbonization system;
according to other embodiments of the present invention, a pretreatment process for sludge carbonization includes the steps of:
s1, feeding the sludge into a storage bin, and conveying the sludge to a crusher through an even feeder to refine and crush the original sludge;
s2, conveying the crushed sludge to a conditioning tank by using a screw, conditioning and homogenizing the sludge, wherein the conditioning step is to respectively add 10% of quicklime, 2% of iron salt, 2% of aluminum salt, 8% of cationic organic high polymer, 3% of curing agent and 3% of flocculating agent into the sludge according to the absolute dry mass of the sludge, and the homogenizing treatment is to continuously stir in the conditioning tank;
s3, conveying the tempered sludge to a filter by using a hose pump, and screening and cleaning impurities in the sludge;
s4, feeding the screened sludge into a spiral cavitator to destroy the molecular structure in the sludge;
s5, the sludge passes through high-voltage electronic pulse equipment, and the high-voltage pulse current is used for generating a cracking effect on the sludge cell walls, so that the walls of the sludge cell walls are completely broken;
s6, conveying the sludge subjected to wall breaking to a preheating tank through a rotor pump and butting with a subsequent carbonization system;
according to other embodiments of the present invention, a pretreatment process for sludge carbonization includes the steps of:
s1, feeding the sludge into a storage bin, and conveying the sludge to a crusher through an even feeder to refine and crush the original sludge;
s2, conveying the crushed sludge to a conditioning tank by using a screw, conditioning and homogenizing the sludge, wherein the conditioning step is to respectively add 7% of quicklime, 3% of aluminum salt, 6% of cationic organic high molecular polymer, 2% of curing agent and 2% of flocculating agent into the sludge according to the absolute dry mass of the sludge, and the homogenizing treatment is to continuously stir in the conditioning tank;
s3, conveying the tempered sludge to a filter by using a hose pump, and screening and cleaning impurities in the sludge;
s4, feeding the screened sludge into a spiral cavitator to destroy the molecular structure in the sludge;
s5, the sludge passes through high-voltage electronic pulse equipment, and the high-voltage pulse current is used for generating a cracking effect on the sludge cell walls, so that the walls of the sludge cell walls are completely broken;
s6, conveying the sludge subjected to wall breaking to a preheating tank through a rotor pump and butting with a subsequent carbonization system;
sludge is through breakage, quenching and tempering, screening, cavitation, broken wall, preheating step before getting into the carbonization step, makes the granule of sludge before the carbonization step through the screening, and impurity is through screening out, and macromolecular structure decomposes into the small molecule structure, and the cell wall of cell is destroyed completely, consequently to subsequent carbonization step, its carbonization raw materials quality obtains improving, is that the carbon base particulate matter that the carbonization obtained is more exquisite stable, and the carbonization quality obtains improving.
In S1 step, the breaker is the double-roll crusher, with large granule mud breakage to the particle diameter is less than 100 microns, the crushing effect of double-roll crusher is outstanding, can be with large granule mud breakage to the particle diameter is less than 100 microns, prevents that large granule mud impurity from not broken direct entering carbonization system, leads to the gained carbon base particulate matter size nonconformity after the carbonization.
In step S2, the iron salt includes one of ferric chloride, ferric sulfate, ferrous sulfate, polymeric ferric chloride, polymeric ferric sulfate, polymeric ferric chloride sulfate, polymeric ferric phosphate and polymeric ferrosilico-aluminum, the aluminum salt includes one of aluminum sulfate, sodium aluminate, alum, polymeric aluminum chloride, polymeric aluminum sulfate and polymeric aluminum phosphate, the curing agent includes aromatic acid anhydride or aliphatic acid anhydride, the cationic organic high molecular polymer includes one of polydimethyldiallylammonium chloride, polyalphalamine epoxide, cationic polyacrylamide, polyvinylamine, polyethyleneimine and polydimethylaminopropyl methacrylamide, the iron salt and the aluminum salt can be electrolyzed in water to generate iron ions and aluminum ions, the quicklime reacts in water to generate calcium hydroxide, the iron ions and the aluminum ions generate iron hydroxide and aluminum hydroxide, the suspended impurities in the sludge can be removed, the cationic organic high molecular polymer can play a flocculation role, the sludge is concentrated, the volume of the sludge is greatly reduced, and the curing agent can crosslink and form molecules in the concentrated sludge.
In the step S3, the filter is a vibration filter, the vibration frequency is 4500 Hz, and light flocculated substances in the sludge are screened out through the vibration filter.
In the step of S4, blasting impact is generated in the spiral cavitator under the action of the acoustic vibration and the acoustic magnetic double field to generate local high-temperature and high-speed microjet, so that chemical bonds in crude oil molecules in the sludge are broken, a macromolecular chain is converted to a micromolecular chain, and an association structure between colloid and asphaltene unit bodies in the sludge is damaged, so that the colloid and the asphaltene are converted into micromolecular substances.
In step S5, the high voltage pulse current is a square wave pulse with a voltage of 120 kv and a pulse frequency of 100 khz, and the high voltage pulse current can break down the cell walls of the organisms in the sludge, so that the remaining biological cells in the sludge are completely destroyed and decomposed.
In the step S6, the temperature in the preheating tank is kept between 50 and 60 ℃, and the temperature in the preheating tank is always kept between 50 and 60 ℃, so that the heating time of the sludge after entering the carbonization step can be saved, and the efficiency of sludge carbonization is accelerated.
The invention adopts the steps of crushing, tempering, screening, cavitation and wall breaking, solves the technical problem that the macromolecular structure and the cell wall of the cell in the sludge are not thoroughly destroyed because the sludge directly enters the carbonization step without pretreatment, and ensures that the components of the sludge are more exquisite and uniform after the sludge is pretreated before carbonization, thereby being beneficial to the subsequent carbonization process.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. A pretreatment process for sludge carbonization is characterized in that: the method comprises the following steps:
s1, feeding the sludge into a storage bin, and conveying the sludge to a crusher through an even feeder to refine and crush the original sludge;
s2, conveying the crushed sludge to a conditioning tank by a screw, conditioning and homogenizing the sludge, wherein the conditioning step is to add 5-10% of quicklime, 2-4% of ferric salt and/or aluminum salt, 5-8% of cationic organic high molecular polymer, 1-3% of curing agent and 1-3% of flocculating agent into the sludge according to the absolute dry mass of the sludge, and the homogenizing treatment is to stir continuously in the conditioning tank;
s3, conveying the tempered sludge to a filter by using a hose pump, and screening and cleaning impurities in the sludge;
s4, feeding the screened sludge into a spiral cavitator to destroy the molecular structure in the sludge;
s5, the sludge passes through high-voltage electronic pulse equipment, and the high-voltage pulse current is utilized to generate a cracking effect on cell walls of biological cells in the sludge, so that the cell walls are completely broken;
and S6, conveying the sludge subjected to wall breaking to a preheating tank through a rotor pump, and butting the sludge with a subsequent carbonization system.
2. The pretreatment process for sludge carbonization according to claim 1, characterized in that: in the step S1, the crusher is a double roll crusher, and large-particle sludge is crushed to a particle diameter of less than 100 μm.
3. The pretreatment process for sludge carbonization according to claim 1, characterized in that: in the step S2, the iron salt includes one of ferric chloride, ferric sulfate, ferrous sulfate, polymeric ferric chloride, polymeric ferric sulfate, polymeric ferric chloride sulfate, polymeric ferric phosphate, and polymeric ferrosilico-aluminum, the aluminum salt includes one of aluminum sulfate, sodium aluminate, alum, polymeric aluminum chloride, polymeric aluminum sulfate, and polymeric aluminum phosphate, the curing agent includes aromatic acid anhydride or aliphatic acid anhydride, and the cationic organic high molecular polymer includes one of polydimethyldiallylammonium chloride, polyalphalamine, cationic polyacrylamide, polyvinylamine, polyethyleneimine, and polydimethylaminopropylmethacrylamide.
4. The pretreatment process for sludge carbonization according to claim 1, characterized in that: in the step S3, the filter is a vibration filter, and the vibration frequency is 3000-.
5. The pretreatment process for sludge carbonization according to claim 1, characterized in that: in the step S4, the spiral cavitator generates a burst impact under the action of the acoustic vibration and the acoustic magnetic field to generate local high-temperature and high-speed microjet, so that chemical bonds in crude oil molecules in the sludge are broken, macromolecular chains are converted into small molecular chains, and an association structure between colloid and asphaltene units in the sludge is destroyed, thereby promoting the colloid and the asphaltene to be converted into small molecular substances.
6. The pretreatment process for sludge carbonization according to claim 1, characterized in that: in the step S5, the high voltage pulse current is a rectangular wave pulse with a voltage of 100-.
7. The pretreatment process for sludge carbonization according to claim 1, characterized in that: in the step S6, the temperature in the preheating tank is maintained at 50 to 60 degrees celsius.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114195339A (en) * | 2021-11-22 | 2022-03-18 | 深圳市政水环境技术有限公司 | Synchronous sludge reduction method, device and system for recycling sludge carbon source |
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Application publication date: 20200918 |