CN109354380A - A method of improving thickened sludge dewatering - Google Patents
A method of improving thickened sludge dewatering Download PDFInfo
- Publication number
- CN109354380A CN109354380A CN201811524049.1A CN201811524049A CN109354380A CN 109354380 A CN109354380 A CN 109354380A CN 201811524049 A CN201811524049 A CN 201811524049A CN 109354380 A CN109354380 A CN 109354380A
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- Prior art keywords
- sludge
- temperature
- copolymer
- mud granule
- polyacrylate
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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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a kind of methods for improving thickened sludge dewatering, comprising the following steps: sludge condensation to 5% or more solid content is pumped into reactor tank, water polyacrylic acid copolymer is added and is uniformly mixed；It adds acid and quickly stirs, adjusting pH is 3-5, reacts 10-30min；Sludge is pumped into heating tank and is heated, is elevated the temperature to Tg or more the 10-40 DEG C of polyacrylate copolymer；Keep the temperature 10-40min；Sludge heat exchange cooling down to temperature is lower than polyacrylate copolymer Tg or less 5-10 DEG C, makes polymer quick-hardening at cubic network shape skeleton, supports hole between the mud granule of formation；Will cooling sludge filtering means dehydration immediately, form permeable duct when sludge filtration by the supporting role of the copolymer molecule chain after hardening, improve thickened sludge dewatering.
Description
Technical field
The invention belongs to the technical field of sludge treatment in environmental protection, in particular to a kind of raising thickened sludge dehydration property
The method of energy.
Background technique
The dehydration of sludge is always global problem, is contained in the thickened sludge that especially sewage treatment project generates a large amount of
Hydrophilic organics hydrophilicity is carried out mechanical de- in conjunction with water content height using plate and frame filter press, belt type dewaterer or centrifugal dehydrator etc.
Sludge blanket duct is easy blocking when the solid-liquid separating methods such as water or vacuum dehydration are dehydrated, and rate of water loss is slow, moisture content of the cake
It is high.
At present for the improvement of dewatering performance of sludge, main includes heat conditioning, freeze thawing treatment, and high-temperature-hot-water solution adds wadding
Solidifying agent increases the methods of floc particle, but effect is generally not satisfactory, and sludge specific resistance is high, and dehydration property is poor.
Summary of the invention
The purpose of the present invention is to provide a kind of methods for improving thickened sludge dewatering, by reducing sludge specific resistance,
Improve thickened sludge dewatering.
For achieving the above object, the technical method that the present invention uses are as follows:
A method of thickened sludge dewatering is improved, the pH and temperature-responsive polyacrylate added into sludge is utilized
High-molecular copolymer changes its physical state by temperature change to the response of temperature, reduces sludge specific resistance, improves thickened sludge
Dewatering, comprising the following steps:
(1) sludge compression precipitating or floatation thickening to 5% or more solid content are pumped into reactor tank, vitrifying is added into sludge
Temperature (Tg) be higher than room temperature by soft monomer, hard monomer and acrylic monomer be copolymerized the pH formed and temperature-responsive it is aqueous gather
Acrylate copolymer, dosage are 0.2-0.6g/g dewatered sludge, are uniformly mixed；
(2) acid is added into sludge and is quickly stirred, 10-30min is reacted, and makes pH and temperature-responsive polyacrylate in sludge
Water soluble group-COO in copolymer—Binding hydrogen ions, formation-COOH, and with H+Inhibit carboxylic acid group's ionization, reduces poly- third
The solubility of olefin(e) acid ester copolymer makes copolymer molecule sufficiently be precipitated and inhale with mud granule by Van der Waals force and hydrogen bond action
Attached combination, pH is 3-5 after reaction；
(3) sludge is pumped into heating tank and is heated, elevated the temperature to the Tg of pH and temperature-responsive polyacrylate copolymer
Above 10-40 DEG C, changing its physical state crimps copolymer molecule chain, coheres mud granule, drives mud granule movement；
(4) 10-40min is kept the temperature, the copolymer molecule chain cohered with mud granule is made to reunite together with mud granule, shrinks and becomes
Shape, forms hole between mud granule, and reduces the hydrophilic of mud granule by hydrophobic groupings such as methyl, ester groups in copolymer
Property；
(5) by sludge heat exchange cooling down to temperature lower than 5-10 below pH and temperature-responsive polyacrylate copolymer Tg
DEG C, so that polymer molecular chain is changed physical state and revert to glassy state, quick-hardening supports formation at cubic network shape skeleton
Hole between mud granule；
(6) it will be cooled to temperature and filter take off immediately with temperature-responsive polyacrylate copolymer Tg sludge below lower than pH
Water is formed permeable duct when sludge filtration by the supporting role of the copolymer molecule chain after hardening, prevents or reduces filtering
Duct deforms in the process, and by the hydrophobic effect of the hydrophobic groupings such as methyl, ester group in polyacrylate copolymer, improves
Thickened sludge dewatering.
The utility model has the advantages that
A. thickened sludge is treated by the present method, and sludge specific resistance can be reduced to original 2-6%, is transformed into easily by difficult filter sludge
Filter sludge, filtering rate are greatly accelerated, and identical moisture content of the cake is reached, and filtration time shortens 80% or more.
B. the carboxyl in pH and temperature-responsive copolymer being precipitated can be acted on the hydrophilic group of mud granule, be changed dirty
Mud surface property reduces the active force between mud granule and water, while methyl, ethyl, ester group in copolymer soft segment
Equal hydrophobic groupings further increase the hydrophobicity of mud granule, increase repulsion between muddy water, reduce and combine containing for water in thickened sludge
Amount is conducive to sludge dewatering.
C. the pH and temperature-responsive polyacrylate copolymer formed with acid out in water phase is existed by the response to temperature
The variation of physical state realizes that sludge-heat-preservation sludge deformation drilling-is cohered in softening absorption in water phase above and below glass transition temperature
The permeable pore canal role of hardening support.The temperature-responsive polyacrylate copolymer strand coulomb repulsion of precipitation reduces, and is heated
Effect is rolled up afterwards, can bond sludge, drives mud granule high degree of agglomeration and deformation retract, forms hole structure between mud granule
Dehydration duct when at filtering means dehydration, and hardening by cooling rear support is dehydrated channel, and sludge hole becomes when can reduce filtering means dehydration
Shape, collapsing reduce sludge specific resistance.
Specific embodiment
The present invention is further illustrated below by specific embodiment.
Embodiment 1
A method of improving thickened sludge dewatering, comprising the following steps:
(1) sludge compression precipitating or floatation thickening to 5% or more solid content are pumped into reactor tank, vitrifying is added into sludge
Temperature (Tg) be higher than room temperature by soft monomer, hard monomer and acrylic monomer be copolymerized the pH formed and temperature-responsive it is aqueous gather
Acrylate copolymer, dosage are 0.3g/g dewatered sludge, are uniformly mixed；
(2) 50% hydrochloric acid is added into sludge and is quickly stirred, and adjusting pH is 3.9, reacts 15min, makes pH and temperature in sludge
Water soluble group-COO in responsiveness polyacrylate copolymer—Binding hydrogen ions, formation-COOH, and with H+Inhibit carboxylic
Acidic group ionization, reduces the solubility of copolymer, and copolymer molecule is precipitated sufficiently and passes through Van der Waals force and hydrogen with mud granule
Key effect absorption combines；
(3) sludge is pumped into heating tank and is heated, elevated the temperature to the Tg of pH and temperature-responsive polyacrylate copolymer
Above 15 DEG C, copolymer molecule chain is crimped, cohere mud granule, drives mud granule movement；
(4) 40min is kept the temperature, the copolymer molecule chain cohered with mud granule is made to reunite together with mud granule, contraction distortion,
Hole between formation mud granule, and pass through the hydrophobic groups such as methyl, ester group in pH and temperature-responsive polyacrylate copolymer
Group reduces the hydrophily of mud granule；
(5) sludge heat exchange cooling down to temperature is lower than 10 DEG C of copolymer Tg or less, polymer molecular chain is made to revert to glass
Glass state, quick-hardening support hole between the mud granule of formation at cubic network shape skeleton；
(6) it will be cooled to temperature and filter take off immediately with temperature-responsive polyacrylate copolymer Tg sludge below lower than pH
Water is formed permeable duct when sludge filtration by the supporting role of the copolymer molecule chain after hardening, prevents or reduces filtering
Duct deforms in the process, and by the hydrophobic effect of the hydrophobic groupings such as methyl, ester group in copolymer, it is de- to improve thickened sludge
Aqueous energy.
Vacuum filtration test result shows that sludge specific resistance is reduced to the 5.86% of raw sewage, and it is left that moisture content of the cake reduces by 3.1%
It is right.
Embodiment 2
A method of improving thickened sludge dewatering, comprising the following steps:
(1) sludge compression precipitating or floatation thickening to 5% or more solid content are pumped into reactor tank, vitrifying is added into sludge
Temperature (Tg) be higher than room temperature by soft monomer, hard monomer and acrylic monomer be copolymerized the pH formed and temperature-responsive it is aqueous gather
Acrylate copolymer, dosage are 0.6g/g dewatered sludge, are uniformly mixed；
(2) formic acid is added into sludge and is quickly stirred, and adjusting pH is 4.2, reacts 30min, makes pH and temperature-responsive in sludge
Water soluble group-COO in property polyacrylate copolymer—Binding hydrogen ions, formation-COOH, and with H+Inhibit carboxylic acid group
Ionization, reduces the solubility of copolymer, and copolymer molecule is made sufficiently to be precipitated and make with mud granule by Van der Waals force and hydrogen bond
It is combined with absorption；
(3) sludge is pumped into heating tank and is heated, elevated the temperature to the Tg of pH and temperature-responsive polyacrylate copolymer
Above 30 DEG C, copolymer molecule chain is crimped, cohere mud granule, drives mud granule movement；
(4) 20min is kept the temperature, the copolymer molecule chain cohered with mud granule is made to reunite together with mud granule, contraction distortion,
Hole between formation mud granule, and pass through the hydrophobic groups such as methyl, ester group in pH and temperature-responsive polyacrylate copolymer
Group reduces the hydrophily of mud granule；
(5) by sludge heat exchange cooling down to temperature lower than 5 DEG C below pH and temperature-responsive polyacrylate copolymer Tg,
Polymer molecular chain is set to revert to glassy state, quick-hardening supports hole between the mud granule of formation at cubic network shape skeleton；
(6) it will be cooled to temperature and filter take off immediately with temperature-responsive polyacrylate copolymer Tg sludge below lower than pH
Water is formed permeable duct when sludge filtration by the supporting role of the copolymer molecule chain after hardening, prevents or reduces filtering
Duct deforms in the process, and by the hydrophobic effect of the hydrophobic groupings such as methyl, ester group in copolymer, it is de- to improve thickened sludge
Aqueous energy.
Vacuum filtration test result shows that sludge specific resistance is reduced to the 2.02% of raw sewage, and it is left that moisture content of the cake reduces by 5.60%
It is right.
Embodiment 3
A method of improving thickened sludge dewatering, comprising the following steps:
(1) sludge compression precipitating or floatation thickening to 5% or more solid content are pumped into reactor tank, vitrifying is added into sludge
Temperature (Tg) be higher than room temperature by soft monomer, hard monomer and acrylic monomer be copolymerized the pH formed and temperature-responsive it is aqueous gather
Acrylate copolymer, dosage are 0.4g/g dewatered sludge, are uniformly mixed；
(2) 93% concentrated sulfuric acid is added into sludge and is quickly stirred, and adjusting pH is 4.0, reacts 10-30min, is copolymerized sludge
Water soluble group-COO in object—Binding hydrogen ions, formation-COOH, and with H+Inhibit carboxylic acid group's ionization, reduces copolymer
Solubility makes copolymer molecule sufficiently be precipitated and be combined with mud granule by Van der Waals force and hydrogen bond action absorption；
(3) sludge is pumped into heating tank and is heated, elevated the temperature to the Tg of pH and temperature-responsive polyacrylate copolymer
Above 20 DEG C, copolymer molecule chain is crimped, cohere mud granule, drives mud granule movement；
(4) 30min is kept the temperature, the copolymer molecule chain cohered with mud granule is made to reunite together with mud granule, contraction distortion,
It forms hole between mud granule, and reduces the hydrophily of mud granule by hydrophobic groupings such as methyl, ester groups in copolymer；
(5) by sludge heat exchange cooling down to temperature lower than below pH and temperature-responsive polyacrylate copolymer Tg 10
DEG C, so that copolymer molecule chain is reverted to glassy state, quick-hardening supports hole between the mud granule of formation at cubic network shape skeleton
Gap；
(6) it will be cooled to temperature and filter take off immediately with temperature-responsive polyacrylate copolymer Tg sludge below lower than pH
Water is formed permeable duct when sludge filtration by the supporting role of the copolymer molecule chain after hardening, prevents or reduces filtering
Duct deforms in the process, and by the hydrophobic effect of the hydrophobic groupings such as methyl, ester group in copolymer, it is de- to improve thickened sludge
Aqueous energy.
Vacuum filtration test result shows that sludge specific resistance is reduced to the 3.65% of raw sewage, and it is left that moisture content of the cake reduces by 4.72%
It is right.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any those skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its invent
Design is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of method for improving thickened sludge dewatering, which is characterized in that rung using the pH and temperature that are added into sludge
Answering property polyacrylate high-molecular copolymer changes its physical state by temperature change to the response of temperature, reduces sludge ratio
Resistance improves thickened sludge dewatering, comprising the following steps:
(1) sludge compression precipitating or floatation thickening to 5% or more solid content are pumped into reactor tank, pH and temperature is added into sludge
Responsiveness polyacrylate high-molecular copolymer is spent, dosage is 0.2-0.6g/g dewatered sludge, is uniformly mixed；
(2) acid is added into sludge and is quickly stirred, and is reacted 10-30min, is made water-soluble in polyacrylate copolymer in sludge
Property group-COO—Binding hydrogen ions, formation-COOH, and with H+Inhibit carboxylic acid group's ionization, reduces polyacrylate copolymer
Solubility makes copolymer molecule sufficiently be precipitated and be combined with mud granule by Van der Waals force and hydrogen bond action absorption, after reaction
PH is 3-5；
(3) sludge is pumped into heating tank and is heated, elevated the temperature to Tg or more the 10-40 DEG C of polyacrylate copolymer, change
Become its physical state, crimp polyacrylate copolymer strand, cohere mud granule, drives mud granule movement；
(4) 10-40min is kept the temperature, the copolymer molecule chain cohered with mud granule is made to reunite together with mud granule, shrinks and becomes
Shape, forms hole between mud granule, and reduces sludge by hydrophobic groupings such as methyl, ester groups in polyacrylate copolymer
The hydrophily of grain；
(5) sludge heat exchange cooling down to temperature is lower than polyacrylate copolymer Tg or less 5-10 DEG C, makes polymer point
Subchain changes physical state and reverts to glassy state, quick-hardening；
(6) it will be cooled to temperature and be lower than polyacrylate copolymer Tg sludge below filtering means dehydration immediately, after hardening
The supporting role of copolymer molecule chain forms permeable duct when sludge filtration, prevents or reduces duct in filter process and deforms,
And the hydrophobic effect by hydrophobic groupings such as methyl, ester groups in polyacrylate copolymer, improve thickened sludge dehydration property
Energy.
2. a kind of method for improving thickened sludge dewatering according to claim 1, which is characterized in that the step
(1) pH in and temperature-responsive polyacrylate copolymer is soft by esters of acrylic acid, hard monomer or non-acrylic compounds hard monomer
Copolymerization is formed, and controlling polymer Tg by monomer mole ratio is 40-80 DEG C.
3. a kind of method for improving thickened sludge dewatering according to claim 1, which is characterized in that the step
(2) acid in is inorganic acid or organic acid, and the ionization that should be greater than carboxylic acid group in polyacrylic acid if organic acid its dissociation constant is normal
Number.
4. a kind of method for improving thickened sludge dewatering according to claim 1, which is characterized in that the step
(3) using electric heating, steam heating or conduction oil etc., directly or indirectly any one of heating method or joint add the heating in
Hot mode.
5. a kind of method for improving thickened sludge dewatering according to claim 1, which is characterized in that the step
(5) cooling down in be using add acid reaction after sludge by heat exchange carry out, recycling thermal energy.
6. a kind of method for improving thickened sludge dewatering according to claim 1, which is characterized in that the step
(6) filtering means dehydration in is using formula either in natural filtration, mechanism filter-pressing or vacuum filtration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811524049.1A CN109354380A (en) | 2018-12-13 | 2018-12-13 | A method of improving thickened sludge dewatering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811524049.1A CN109354380A (en) | 2018-12-13 | 2018-12-13 | A method of improving thickened sludge dewatering |
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| Publication Number | Publication Date |
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| CN109354380A true CN109354380A (en) | 2019-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811524049.1A Withdrawn CN109354380A (en) | 2018-12-13 | 2018-12-13 | A method of improving thickened sludge dewatering |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51126969A (en) * | 1975-04-30 | 1976-11-05 | Kurita Water Ind Ltd | A method of dehydrating activated sludge |
| JPS58131200A (en) * | 1982-01-29 | 1983-08-04 | Unitika Ltd | Treatment of sludge |
| CN105084576A (en) * | 2014-05-05 | 2015-11-25 | 青岛大学 | Method for treating high-concentration water-based ink waste liquid and dehydrating sludge in high-concentration water-based ink waste liquid |
| CN106608709A (en) * | 2015-10-27 | 2017-05-03 | 禾华环保科技（上海）有限公司 | Dehydrating agent for sludge, and preparation and application thereof |
| WO2018022352A1 (en) * | 2016-07-25 | 2018-02-01 | Dow Global Technologies Llc | Acoustic mixing for flocculant addition to mineral suspensions |
-
2018
- 2018-12-13 CN CN201811524049.1A patent/CN109354380A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51126969A (en) * | 1975-04-30 | 1976-11-05 | Kurita Water Ind Ltd | A method of dehydrating activated sludge |
| JPS58131200A (en) * | 1982-01-29 | 1983-08-04 | Unitika Ltd | Treatment of sludge |
| CN105084576A (en) * | 2014-05-05 | 2015-11-25 | 青岛大学 | Method for treating high-concentration water-based ink waste liquid and dehydrating sludge in high-concentration water-based ink waste liquid |
| CN106608709A (en) * | 2015-10-27 | 2017-05-03 | 禾华环保科技（上海）有限公司 | Dehydrating agent for sludge, and preparation and application thereof |
| WO2018022352A1 (en) * | 2016-07-25 | 2018-02-01 | Dow Global Technologies Llc | Acoustic mixing for flocculant addition to mineral suspensions |
Non-Patent Citations (2)
| Title |
|---|
| 冯孝中等: "《高分子材料》", 28 February 2007, 哈尔滨工业大学出版社 * |
| 王淑荣 主编: "《染整废水处理》", 30 September 2005, 中国纺织出版社 * |
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Address after: 266071 No. 7 East Hongkong Road, Laoshan District, Shandong, Qingdao Applicant after: Qingdao University Address before: 266071 Ningxia Road, Shandong, China, No. 308, No. Applicant before: Qingdao University |
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Application publication date: 20190219 |