CN109354360A - A method of accelerating thickened sludge dehydration - Google Patents
A method of accelerating thickened sludge dehydration Download PDFInfo
- Publication number
- CN109354360A CN109354360A CN201811523240.4A CN201811523240A CN109354360A CN 109354360 A CN109354360 A CN 109354360A CN 201811523240 A CN201811523240 A CN 201811523240A CN 109354360 A CN109354360 A CN 109354360A
- Authority
- CN
- China
- Prior art keywords
- sludge
- dehydration
- temperature
- thickened
- polyacrylate copolymer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
-
- 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
- C02F11/123—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using belt or band filters
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a kind of methods of quickening thickened sludge dehydration, which comprises the following steps: by thickened sludge anaerobic digestion, controls digestion process and is in the hydrolysis acidification stage, digestive juice pH is made constantly to be reduced to 5 or less；Sludge is pumped into reactor tank, temperature-responsive polyacrylate copolymer is added, reacts 10-30min after mixing；Sludge is pumped on the dehydration strainer continuously run, pre-dehydration 1-2min；From bottom-heated sludge, polyacrylate copolymer strand is crimped, constitutes permeable duct in sludge blanket；Cooling to make to form cubic network skeleton in sludge blanket after polyacrylate copolymer hardening, the permeable duct formed in support sludge blanket reduces sludge specific resistance, accelerates sludge dewatering；The quick filtering means dehydration 1-2min of sludge forms dehydrated sludge cake and is discharged；Deviate from sludge of the water first after heat exchange preheats anaerobic digestion again with thickened sludge heat exchange, accelerates sludge hydrolysis, acidification, recycling thermal energy reduces energy consumption.
Description
Technical field
The invention belongs to the sludge dewatering treatment technical field in environmental protection, in particular to a kind of quickening thickened sludge is de-
The method of water.
Background technique
The dehydration of thickened sludge is always global problem, and especially Industrial Wastewater Treatment generates in thickened sludge containing big
Organic matter is measured, hydrophily is strong, in conjunction with water content height, carries out machine using plate and frame filter press, belt type dewaterer, vacuum hydroextractor etc.
Rate of water loss is slow when tool is dehydrated, and moisture content of the cake 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 rate of water loss is slow.
Summary of the invention
The purpose of the present invention is to provide a kind of methods of quickening thickened sludge dehydration, by the ratio for reducing thickened sludge
Resistance improves sludge filtration dewatering speed, can substantially shorten dewatering time.
For achieving the above object, the technical method that the present invention uses are as follows:
A method of accelerating thickened sludge dehydration, which is characterized in that utilize the temperature-responsive polypropylene added into sludge
Acid esters high-molecular copolymer changes its physical state by temperature change to the response of temperature, reduces sludge specific resistance, accelerates concentration
Sludge dewatering, comprising the following steps:
(1) thickened sludge is subjected to Anaerobic Digestion, control digestion process is in the hydrolysis acidification stage, makes the part in sludge
Organic matter fermentation generates organic acid, so that digestive juice pH is constantly reduced to 5 hereinafter, organic acid ionization generates hydrogen ion, inhibition is subsequent
The ionization of temperature-responsive polyacrylate copolymer water soluble group；
(2) sludge after anaerobic digestion is pumped into reactor tank, glass transition temperature is added into sludge while stirring and is higher than room temperature
The temperature-responsive polyacrylate copolymer formed is copolymerized by soft monomer, hard monomer and acrylic monomer, dosage is
100-400mg/g dewatered sludge reacts 10-30min after mixing, the H that the organic acid ionization generated using hydrolysis acidification is generated+With add
The temperature-responsive polyacrylate copolymer entered -COO—In conjunction with sloughing [NR4]+, formation-COOH, and with excessive H+
Inhibit carboxylic acid group's ionization, reduces the solubility of temperature-responsive polyacrylate copolymer, copolymer molecule is precipitated sufficiently simultaneously
It is combined together with mud granule by Van der Waals force and hydrogen bond action, then uses air floatation machine thickened sludge；
(3) sludge after concentration is pumped on the dehydration strainer continuously run, is evenly distributed, pre-dehydration 1-2min；
(4) it from bottom-heated sludge, elevates the temperature to the glass transition temperature (Tg) of temperature-responsive polyacrylate copolymer
Above 20-40 DEG C, so that temperature-responsive polyacrylate copolymer is changed the curling of its physical state strand, cohere sludge
Grain drives mud granule contraction distortion, forms hole between the mud granule constantly increased upwards by sludge blanket bottom, constitutes sludge
Permeable duct in layer；
(5) abundant back dehydration side is deformed to upper layer sludge be cooled below temperature-responsive from bottom to top from sludge blanket bottom
Polyacrylate copolymer Tg is hereinafter, make temperature-responsive polyacrylate copolymer strand in sludge blanket change its physics for property
State is transformed into glassy state, and cubic network skeleton is formed after hardening from bottom to top, and the permeable duct formed in support sludge blanket is prevented
Only duct deforms, and reduces sludge specific resistance, accelerates sludge dewatering；
(6) the quick filtering means dehydration 1-2min of sludge forms dehydrated sludge cake and is discharged；
(7) first the sludge after heat exchange preheats anaerobic digestion accelerates sludge hydrolytic acid again with thickened sludge heat exchange to abjection water
Change, recycling thermal energy reduces energy consumption.
The utility model has the advantages that
A. polyacrylate analog copolymer is precipitated with the small molecular organic acid that sludge hydrolysis, acidification is formed, had both reduced sludge body
Product saves acid again, reduces processing cost.
B. the temperature-responsive polyacrylate copolymer formed with acid out is by the response to temperature in glass transition temperature
The transformation of upper and lower physical state realizes that softening absorption is cohered sludge-permeable duct of heat-preservation sludge deformation drilling-hardening support and made
With.The temperature-responsive polyacrylate copolymer strand coulomb repulsion of precipitation reduces, and the effect of rolling up after being heated can glue
Sludge is tied, mud granule high degree of agglomeration and deformation retract are driven, the dehydration between formation mud granule when hole composition filtering means dehydration
Duct, and hardening by cooling rear support is dehydrated channel, and sludge pore deformation, collapsing, reduce sludge ratio when can reduce filtering means dehydration
Resistance.
C. the carboxyl in temperature-responsive copolymer being precipitated can be acted on the hydrophilic group of mud granule, change sludge table
Face performance reduces the active force between mud granule and water, while methyl, ethyl, ester group in copolymer soft segment etc. is dredged
Water base group further increases the hydrophobicity of mud granule, increases repulsion between muddy water, reduces the content that water is combined in thickened sludge, benefit
In sludge dewatering.
D. thickened sludge is treated by the present method, and sludge specific resistance can be reduced to original 1-5%, is transformed by difficult filter sludge
For easy filter sludge, reach identical moisture content of the cake, dewatering time is shorten within original 1/10th.
Specific embodiment
The present invention is further illustrated below by specific embodiment.
Embodiment 1
(1) thickened sludge is subjected to Anaerobic Digestion, control digestion process is in the hydrolysis acidification stage, makes the part in sludge
Organic matter fermentation generates organic acid, and digestive juice pH is made constantly to be reduced to 3.92, and organic acid ionization generates hydrogen ion, inhibits subsequent temperature
Spend the ionization of responsiveness polyacrylate copolymer water soluble group；
(2) sludge after anaerobic digestion is pumped into reactor tank, be added while stirring into sludge by soft monomer, hard monomer and propylene
Acid system monomer is copolymerized the temperature-responsive polyacrylate copolymer to be formed, and dosage is 400mg/g dewatered sludge, reacts after mixing
30min, the H that the organic acid ionization generated using hydrolysis acidification is generated+With the temperature-responsive polyacrylate copolymer of addition
- COO—In conjunction with sloughing [NR4]+, formation-COOH, and with excessive H+Inhibit carboxylic acid group's ionization, it is poly- to reduce temperature-responsive
The solubility of acrylate copolymer is precipitated copolymer molecule sufficiently and passes through Van der Waals force and hydrogen bond action with mud granule
It is combined together, then uses air floatation machine thickened sludge；
(3) sludge after concentration is pumped on the dehydration strainer continuously run, is evenly distributed, pre-dehydration 1min；
(4) it from bottom-heated sludge, elevates the temperature to the glass transition temperature (Tg) of temperature-responsive polyacrylate copolymer
Above 30 DEG C, temperature-responsive polyacrylate copolymer strand is crimped, cohere mud granule, mud granule is driven to shrink
Deformation forms hole between the mud granule constantly increased upwards by sludge blanket bottom, constitutes permeable duct in sludge blanket；
(5) abundant back dehydration side is deformed to upper layer sludge be cooled below temperature-responsive from bottom to top from sludge blanket bottom
Polyacrylate copolymer Tg is hereinafter, make temperature-responsive polyacrylate copolymer strand in sludge blanket be transformed into glass for property
State, forms cubic network skeleton after hardening from bottom to top, the permeable duct formed in support sludge blanket prevents duct from deforming, drops
Low sludge specific resistance accelerates sludge dewatering；
(6) Research of Sludge Dewatering by Vacuum Filtration 2min forms dehydrated sludge cake and is discharged；
(7) abjection water first can accelerate sludge hydrolytic again with thickened sludge heat exchange by the sludge after heat exchange preheats anaerobic digestion
Acidification, recycling thermal energy reduce energy consumption.
Vacuum filtering and dewatering the result shows that, sludge specific resistance can be reduced to the 1.42% of raw sewage, and it is aqueous to reach identical mud cake
Rate, filtering means dehydration time can shorten within original 1/10th.
Embodiment 2
A method of accelerating thickened sludge dehydration, which comprises the following steps:
(1) thickened sludge is subjected to Anaerobic Digestion, control digestion process is in the hydrolysis acidification stage, makes the part in sludge
Organic matter fermentation generates organic acid, and digestive juice pH is made constantly to be reduced to 4.08, and organic acid ionization generates hydrogen ion, inhibits subsequent temperature
Spend the ionization of responsiveness polyacrylate copolymer water soluble group；
(2) sludge after anaerobic digestion is pumped into reactor tank, be added while stirring into sludge by soft monomer, hard monomer and propylene
Acid system monomer is copolymerized the temperature-responsive polyacrylate copolymer to be formed, and dosage is 300mg/g dewatered sludge, reacts after mixing
20min, the H that the organic acid ionization generated using hydrolysis acidification is generated+With the temperature-responsive polyacrylate copolymer of addition
- COO—In conjunction with sloughing [NR4]+, formation-COOH, and with excessive H+Inhibit carboxylic acid group's ionization, it is poly- to reduce temperature-responsive
The solubility of acrylate copolymer is precipitated copolymer molecule sufficiently and passes through Van der Waals force and hydrogen bond action with mud granule
It is combined together, then uses air floatation machine thickened sludge；
(3) sludge after concentration is pumped on the dehydration strainer continuously run, is evenly distributed, pre-dehydration 1min；
(4) it from bottom-heated sludge, elevates the temperature to the glass transition temperature (Tg) of temperature-responsive polyacrylate copolymer
Above 25 DEG C, temperature-responsive polyacrylate copolymer strand is crimped, cohere mud granule, mud granule is driven to shrink
Deformation forms hole between the mud granule constantly increased upwards by sludge blanket bottom, constitutes permeable duct in sludge blanket；
(5) abundant back dehydration side is deformed to upper layer sludge be cooled below temperature-responsive from bottom to top from sludge blanket bottom
10 DEG C of polyacrylate copolymer Tg or less of property, is transformed into temperature-responsive polyacrylate copolymer strand in sludge blanket
Glassy state, forms cubic network skeleton after hardening from bottom to top, the permeable duct formed in support sludge blanket prevents duct from becoming
Shape reduces sludge specific resistance, accelerates sludge dewatering；
(6) the quick filtering means dehydration 1min of sludge forms dehydrated sludge cake and is discharged；
(7) abjection water first can accelerate sludge hydrolytic again with thickened sludge heat exchange by the sludge after heat exchange preheats anaerobic digestion
Acidification, recycling thermal energy reduce energy consumption.
Vacuum filtering and dewatering the result shows that, sludge specific resistance can be reduced to the 1.65% of raw sewage, and it is aqueous to reach identical mud cake
Rate, filtering means dehydration time can shorten within original 1/10th.
Embodiment 3
A method of accelerating thickened sludge dehydration, which comprises the following steps:
(1) thickened sludge is subjected to Anaerobic Digestion, control digestion process is in the hydrolysis acidification stage, makes the part in sludge
Organic matter fermentation generates organic acid, and digestive juice pH is made constantly to be reduced to 4.02, and organic acid ionization generates hydrogen ion, inhibits subsequent temperature
Spend the ionization of responsiveness polyacrylate copolymer water soluble group；
(2) sludge after anaerobic digestion is pumped into reactor tank, be added while stirring into sludge by soft monomer, hard monomer and propylene
Acid system monomer is copolymerized the temperature-responsive polyacrylate copolymer to be formed, and dosage is 200mg/g dewatered sludge, reacts after mixing
15min, the H that the organic acid ionization generated using hydrolysis acidification is generated+With the temperature-responsive polyacrylate copolymer of addition
- COO—In conjunction with sloughing [NR4]+, formation-COOH, and with excessive H+Inhibit carboxylic acid group's ionization, it is poly- to reduce temperature-responsive
The solubility of acrylate copolymer is precipitated copolymer molecule sufficiently and passes through Van der Waals force and hydrogen bond action with mud granule
It is combined together, then uses air floatation machine thickened sludge；
(3) sludge after concentration is pumped on the dehydration strainer continuously run, is evenly distributed, pre-dehydration 1min；
(4) it from bottom-heated sludge, elevates the temperature to the glass transition temperature (Tg) of temperature-responsive polyacrylate copolymer
Above 10 DEG C, temperature-responsive polyacrylate copolymer strand is crimped, cohere mud granule, mud granule is driven to shrink
Deformation forms hole between the mud granule constantly increased upwards by sludge blanket bottom, constitutes permeable duct in sludge blanket；
(5) abundant back dehydration side is deformed to upper layer sludge be cooled below temperature-responsive from bottom to top from sludge blanket bottom
10 DEG C of polyacrylate copolymer Tg or less of property, is transformed into temperature-responsive polyacrylate copolymer strand in sludge blanket
Glassy state, forms cubic network skeleton after hardening from bottom to top, the permeable duct formed in support sludge blanket prevents duct from becoming
Shape reduces sludge specific resistance, accelerates sludge dewatering；
(6) the quick filtering means dehydration 2min of sludge forms dehydrated sludge cake and is discharged；
(7) abjection water first can accelerate sludge hydrolytic again with thickened sludge heat exchange by the sludge after heat exchange preheats anaerobic digestion
Acidification, recycling thermal energy reduce energy consumption.
Vacuum filtering and dewatering the result shows that, sludge specific resistance can be reduced to the 2.03% of raw sewage, and it is aqueous to reach identical mud cake
Rate, filtering means dehydration time can shorten within original 1/10th.
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 accelerating thickened sludge dehydration, which is characterized in that utilize the temperature-responsive added into sludge poly- third
Olefin(e) acid ester high-molecular copolymer changes its physical state by temperature change to the response of temperature, reduces sludge specific resistance, accelerates dense
Contracting sludge dewatering, comprising the following steps:
(1) thickened sludge is subjected to Anaerobic Digestion, control digestion process is in the hydrolysis acidification stage, makes the part in sludge
Organic matter fermentation generates organic acid, so that digestive juice pH is constantly reduced to 5 hereinafter, organic acid ionization generates hydrogen ion, inhibition is subsequent
The ionization of temperature-responsive polyacrylate copolymer water soluble group；
(2) sludge after anaerobic digestion is pumped into reactor tank, glass transition temperature (Tg) is added into sludge while stirring and is higher than room
The temperature-responsive polyacrylate copolymer of temperature, reacts 10-30min after mixing, the organic acid electricity generated using hydrolysis acidification
H from generation+With the polyacrylate copolymer of addition-COO—In conjunction with sloughing [NR4]+, formation-COOH, and with excess
H+Inhibit carboxylic acid group ionization, reduce the solubility of polyacrylate copolymer, make copolymer molecule is sufficiently precipitated simultaneously and sludge
Particle is combined together by Van der Waals force and hydrogen bond action, then uses air floatation machine thickened sludge；
(3) thickened sludge is pumped on the dehydration strainer continuously run, is evenly distributed, pre-dehydration 1-2min；
(4) it from bottom-heated sludge, elevates the temperature to glass transition temperature (Tg) above 20-40 of polyacrylate copolymer
DEG C, so that polyacrylate copolymer is changed the curling of its physical state strand, cohere mud granule, drives mud granule to shrink and become
Shape forms hole between the mud granule constantly increased upwards by sludge blanket bottom, constitutes permeable duct in sludge blanket；
(5) abundant back dehydration side is deformed to upper layer sludge be cooled below polyacrylic acid from bottom to top from sludge blanket bottom
Ester copolymer Tg is hereinafter, make polyacrylate copolymer strand in sludge blanket change its physical state recovery glassy state, under
Cubic network skeleton is formed after hardening upwards, the permeable duct formed in support sludge blanket prevents duct from deforming, reduces sludge ratio
Sludge dewatering is accelerated in resistance；
(6) the quick filtering means dehydration 1-2min of sludge forms dehydrated sludge cake and is discharged；
(7) first the sludge after heat exchange preheats anaerobic digestion accelerates sludge hydrolytic acid again with thickened sludge heat exchange to abjection water
Change, recycling thermal energy reduces energy consumption.
2. a kind of method for accelerating thickened sludge dehydration according to claim 1, which is characterized in that in the step (1)
Sludge condensation using compression precipitating be concentrated or floatation thickening mode.
3. a kind of method for accelerating thickened sludge dehydration according to claim 1, which is characterized in that in the step (2)
Polyacrylate copolymer be copolymerized and formed by esters of acrylic acid soft monomer, hard monomer or non-acrylic compounds hard monomer, pass through list
It is 40-80 DEG C that body molar ratio, which controls polymer Tg,.
4. a kind of method for accelerating thickened sludge dehydration according to claim 1, which is characterized in that in the step (4)
Heating refer to using electric heating, steam heating, heat-conducting oil heating mode any or its combined heat mode.
5. a kind of method for accelerating thickened sludge dehydration according to claim 1, which is characterized in that in the step (5)
It is cooling using being blown by the way of cold water or air upwards.
6. a kind of method for accelerating thickened sludge dehydration according to claim 1, which is characterized in that in the step (6)
Filtering means dehydration using vacuum filtration dehydration or filter-press dehydration mode any or its combined dehydration mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811523240.4A CN109354360A (en) | 2018-12-13 | 2018-12-13 | A method of accelerating thickened sludge dehydration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811523240.4A CN109354360A (en) | 2018-12-13 | 2018-12-13 | A method of accelerating thickened sludge dehydration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109354360A true CN109354360A (en) | 2019-02-19 |
Family
ID=65328805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811523240.4A Withdrawn CN109354360A (en) | 2018-12-13 | 2018-12-13 | A method of accelerating thickened sludge dehydration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109354360A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104909487A (en) * | 2014-03-10 | 2015-09-16 | 青岛大学 | High-concentration printing ink waste liquid treatment and sludge dewatering integration method and high-concentration printing ink waste liquid treatment and sludge dewatering integration apparatus |
| 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 |
| CN105621843A (en) * | 2015-11-02 | 2016-06-01 | 江苏沃奇环保工程有限公司 | Sludge vitrifaction curing treatment process |
| CN108862972A (en) * | 2018-06-22 | 2018-11-23 | 山东大学 | A method of sludge charcoal processing is pyrolyzed based on microwave induced orientation heating technique |
-
2018
- 2018-12-13 CN CN201811523240.4A patent/CN109354360A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104909487A (en) * | 2014-03-10 | 2015-09-16 | 青岛大学 | High-concentration printing ink waste liquid treatment and sludge dewatering integration method and high-concentration printing ink waste liquid treatment and sludge dewatering integration apparatus |
| 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 |
| CN105621843A (en) * | 2015-11-02 | 2016-06-01 | 江苏沃奇环保工程有限公司 | Sludge vitrifaction curing treatment process |
| CN108862972A (en) * | 2018-06-22 | 2018-11-23 | 山东大学 | A method of sludge charcoal processing is pyrolyzed based on microwave induced orientation heating technique |
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: "《染整废水处理》", 30 September 2005, 中国纺织出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1914121B (en) | Production of a fermentation product | |
| CN100551933C (en) | A kind of method of extracting bacteria alginate | |
| WO2012048504A1 (en) | Anaerobic digestion treatment process for high concentration sludge obtained from sludge mechanical predehydration | |
| CN102260163B (en) | Method for recovering lactic acid from marigold fermentation wastewater | |
| CN111908756B (en) | Treatment method for efficiently and stably treating municipal sludge | |
| CN104804183A (en) | Method for purifying and separating gamma-polyglutamic acid from fermentation liquor | |
| CN109354360A (en) | A method of accelerating thickened sludge dehydration | |
| CN114349303A (en) | Efficient sludge dewatering treatment process based on low-temperature hydrothermal treatment | |
| CN107652446B (en) | Method for resource utilization of garbage concentrated solution | |
| CN108383251A (en) | A kind of preparation method of antisludging agent | |
| CN109400671B (en) | Method for extracting microbial protein from excess sludge | |
| CN109354363A (en) | A method of reducing thickened sludge resistivity | |
| CN109354362A (en) | A method of improving printing and dyeing industry dewatering performance of sludge | |
| CN109354361A (en) | A method of improving printing and dyeing sludge dewatering | |
| CN109354370A (en) | A method of being dehydrated sludge fast press-filtration | |
| CN111499155B (en) | Anti-freezing sludge deep dehydration conditioner and preparation and application methods thereof | |
| CN109354378A (en) | A kind of method of the quick filtering means dehydration of printing and dyeing sludge | |
| CN1161316C (en) | Lactic acid refining short range distillation process with drum evaporator | |
| CN109354380A (en) | A method of improving thickened sludge dewatering | |
| CN112094390A (en) | Carbon transfer aggregation medium for urban sewage organic matter flocculation and preparation method thereof | |
| CN109354383A (en) | A method of concentration high viscosity organic sludge | |
| CN109354379A (en) | A method of improving printing and dyeing sludge dewatering | |
| CN109354377A (en) | A kind of preprocess method of printing and dyeing sludge fast dewatering | |
| CN109368984A (en) | A kind of method of continuous Floatation Thickening Sludge | |
| CN109368982A (en) | A kind of method of continuous floatation thickening textile printing and dyeing sludge |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
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 |
|
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190219 |