CN111018311A - Normal-temperature modified sludge dehydrating agent and preparation method thereof - Google Patents
Normal-temperature modified sludge dehydrating agent and preparation method thereof Download PDFInfo
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- CN111018311A CN111018311A CN201911174419.8A CN201911174419A CN111018311A CN 111018311 A CN111018311 A CN 111018311A CN 201911174419 A CN201911174419 A CN 201911174419A CN 111018311 A CN111018311 A CN 111018311A
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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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- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/02—Odour removal or prevention of malodour
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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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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- Chemical & Material Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a normal-temperature modified sludge dehydrating agent which comprises, by weight, 20-30 parts of calcium oxide, 15-20 parts of ferric chloride, 30-40 parts of modified starch, 15-20 parts of diatomite, 5-10 parts of volcanic rock, 20-30 parts of gelatin, 5-10 parts of polyacrylamide, 1-2 parts of bentonite, 2-3 parts of talcum powder, 2-5 parts of slag soil and 1-3 parts of chitosan. The normal-temperature modified sludge dehydrating agent obtained by the invention is an organic-inorganic mixture in powder form, the agent is helpful for separating moisture from sludge particles in sludge, so that the dehydration performance and compressibility of the modified sludge are greatly improved, and meanwhile, the dehydrating agent has the effects of sterilization and deodorization, can kill most microorganisms, ova and the like, and reduces the concentration of sludge odor by more than 90%. The addition amount of the dehydrating agent is between 2 and 5 percent, the addition amount is small, the cost is low, and the modification effect is better than that of the traditional modified dehydrating agent.
Description
Technical Field
The invention relates to a sludge dehydrating agent, in particular to a normal-temperature modified sludge dehydrating agent and a preparation method thereof.
Background
At present, domestic and foreign sludge resource utilization modes mainly comprise sludge incineration, sludge brick making, sludge organic fertilizer preparation, sludge ceramsite preparation, sludge ecological cement preparation, sludge anaerobic digestion methane production and the like, or simple sanitary landfill. Except anaerobic digestion of the sludge, the sludge is dehydrated or dried in any other sludge utilization mode, so that the subsequent treatment effect can be ensured.
Too high water content of the sludge can cause high sludge incineration energy consumption and increase treatment cost, and a large amount of water influences incineration temperature, so that the incineration treatment effect cannot be achieved; the process for preparing cement, ceramsite and the like from sludge has higher requirements on the water content of the sludge; if the sludge with the water content of 85% is directly utilized in the sludge composting process, the sludge cannot be uniformly mixed with other composting materials, the decomposition temperature is affected, the sludge composting effect cannot be achieved, and the composting product is not qualified; if the sludge with high water content is directly subjected to sanitary landfill, not only a large amount of land is occupied, but also serious pollution is caused. And the state has corresponding standard requirements on sludge landfill, sludge incineration, sludge used for landscaping and the like, and particularly has strict requirements on the water content of the sludge. Therefore, before the sludge is finally treated, the sludge needs to be dehydrated or dried, so that the water content of the sludge is reduced.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide a normal-temperature modified sludge dehydrating agent for improving the dehydration rate of sludge and a preparation method thereof.
In order to achieve the purpose, the normal-temperature modified sludge dehydrating agent comprises, by weight, 20-30 parts of calcium oxide, 15-20 parts of ferric chloride, 30-40 parts of modified starch, 15-20 parts of diatomite, 5-10 parts of volcanic rock, 20-30 parts of gelatin, 5-10 parts of polyacrylamide, 1-2 parts of bentonite, 2-3 parts of talcum powder, 2-5 parts of slag soil and 1-3 parts of chitosan.
The ferric salt is one or more of ferric trichloride, copperas and ferric sulfate.
The molecular weight of the polyacrylamide is 600-1800 ten thousand.
The preparation method comprises the steps of adding 20-30 parts of calcium oxide, 15-20 parts of ferric chloride, 30-40 parts of modified starch, 15-20 parts of diatomite, 5-10 parts of volcanic rock, 1-2 parts of bentonite, 2-3 parts of talcum powder, 2-5 parts of slag soil and 1-3 parts of chitosan into a polymerization kettle, magnetically stirring for 15-20min, adding 20-30 parts of gelatin and 5-10 parts of polyacrylamide, reacting for 3-4h, evaporating to dryness, and preparing into powder to obtain the normal-temperature modified sludge dehydrating agent.
The use method of the normal-temperature modified sludge dehydrating agent comprises the following steps: 1. adding the normal-temperature modified sludge dehydrating agent and the powder slag into original sludge with the water content of 80-85%, then stirring at a high speed to form original sludge, pumping sludge slurry into a closed modification tank, and modifying the slurry by stirring at a high speed for 4 minutes, wherein in the process, the colloidal structure of the sludge is destroyed, and bound water in the sludge is released, so that the sludge particles are changed from hydrophilicity to hydrophobicity; 2. adding water accounting for about 30-50% of the weight of the original sludge into the original sludge, and continuously stirring to form sludge slurry; 3. pumping the modified slurry into a plate-and-frame filter press for pressurizing to enable the sludge slurry to undergo solid-liquid separation to form a sludge cake; 4. crushing the mud cakes, uniformly stacking the mud cakes, wherein the stacking height is 30-50cm, and drying the mud cakes by solar energy to obtain dried mud particles with the water content of about 35%; and finally, carrying out resource treatment in different directions according to the existing resources.
The sludge modification dehydrating agent has the advantages of low cost, small addition amount, good modification effect and no secondary pollution. The dehydrating agent is different from the traditional sludge modification dehydrating agent, is an organic-inorganic mixture, is powdery, replaces ferric chloride in the traditional sludge dehydrating agent, and has lower sludge modification cost, less consumption (not higher than 2% of the weight of sludge) and better effect; the medicament does not contain toxic and harmful substances, is easy to degrade and does not produce secondary pollution. In addition, because the agent does not use the traditional ferric chloride, the generation of dioxin is restrained from the source when the treated sludge is used for incineration; the agent is beneficial to separating water from sludge particles in the sludge, can rapidly improve the fluidity and filter-pressing dehydration performance of the slurry, is difficult to kill most microorganisms, ova and the like in the sludge, and reduces the odor concentration of the sludge by more than 90 percent; the modification effect is far better than that of the traditional dehydrating agent, and the dehydrating agent is a high-efficiency sludge modification dehydrating agent.
The principle of the dehydrating agent is that chemical sludge modification is to convert the hydrophilicity of a molecular structure sludge micelle into hydrophobicity by using a chemical agent, so that sludge particles are separated from moisture, most microorganisms in sludge are killed, the generation of odor source substances is inhibited, and the purposes of dehydration and deodorization are achieved. The combination degree of the water and the sludge particles is as follows: internal water > adsorbed water > capillary water > interstitial water, the higher the degree of binding, the more difficult it is to remove. The modification process is to break the hydrophilicity of the sludge colloid structure and break the microbial cell wall to decompose the hydrophilic organic colloid substance, thereby reducing the affinity between sludge particles and water, releasing water in cells, improving the sludge concentration performance and the dehydration performance, successfully realizing the separation of most of interstitial water and capillary combined water in the modified sludge and partial adsorption of water in cells and sludge particles, and changing sludge molecules from hydrophilicity to hydrophobicity to improve the sludge dehydration performance and achieve the purpose of dehydration. The modified sludge is in a fluid state, the modified sludge is in a flocculent colloid structure, and capillary water, adsorbed water and water in cells are tightly combined and fused with sludge particles into a whole and are difficult to remove by mechanical pressure extrusion; after modification, most of water in the sludge comprises water in cells to realize separation from sludge particles, so that the sludge which is difficult to compress becomes easy to compress and dehydrate. The modified dehydrating agent is matched with a special plate-and-frame filter press for use, so that the water content of sludge can be reduced from 85% to below 40%, the odor concentration is reduced by more than 90%, and a stable semi-dried mud cake is formed, and the mud cake after chemical modification has hydrophobicity which is not possessed by mud cakes after other technical processes, and the specific characteristics are as follows: 1. the stable semi-dried mud cake can still keep the original shape after being soaked in water for more than one week, and the leaching rate of heavy metals in the mud is very low. 2. In natural environment, the mud cake can not be softened and dissolved when meeting rain water, and the water in the mud cake can be naturally volatilized in flowing air.
The river sludge normal temperature chemical modification and deep filter pressing dewatering technology and equipment has the advantages that due to the innovation of the technical process equipment, the dewatering performance of the sludge can be greatly improved, the water content of the sludge is reduced to be below 40%, and the requirements of the sludge on the water content in the corresponding national standard in incineration, landfill, brick making and landscaping utilization are met. The technical equipment is a sludge deep dehydration technology with the lowest sludge treatment cost, the highest efficiency and the largest treatment capacity at present, and the full-automatic control is realized, the operation is simple, the modular unit combination is realized, and the prospect is very good.
The normal-temperature modified sludge dehydrating agent obtained by the invention is an organic-inorganic mixture in powder form, and the agent is helpful for separating moisture from sludge particles in sludge, so that the dehydration performance and compressibility of the modified sludge are greatly improved, and meanwhile, the dehydrating agent has the effects of sterilization and deodorization, can kill most microorganisms, ova and the like, and reduces the concentration of sludge odor by more than 90%. The addition amount of the dehydrating agent is between 2 and 5 percent, the addition amount is small, the cost is low, and the modification effect is better than that of the traditional modified dehydrating agent.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1:
the room-temperature modified sludge dehydrating agent provided by the embodiment comprises, by weight, 20 parts of calcium oxide, 15 parts of ferric chloride, 30 parts of modified starch, 15 parts of diatomite, 5 parts of volcanic rock, 20 parts of gelatin, 5 parts of polyacrylamide, 1 part of bentonite, 2 parts of talcum powder, 2 parts of slag soil and 1 part of chitosan.
The ferric salt is one or more of ferric trichloride, copperas and ferric sulfate.
The molecular weight of the polyacrylamide is 600-1800 ten thousand.
The preparation method comprises the steps of adding 20 parts of calcium oxide, 15 parts of ferric chloride, 30 parts of modified starch, 15 parts of diatomite, 5 parts of volcanic rock, 20 parts of gelatin, 5 parts of polyacrylamide, 1 part of bentonite, 2 parts of talcum powder, 2 parts of slag soil and 1 part of chitosan into a polymerization kettle, magnetically stirring for 15-20min, adding 20 parts of gelatin and 5 parts of polyacrylamide, reacting for 3-4h, evaporating to dryness and preparing into powder to obtain the normal-temperature modified sludge dehydrating agent.
Example 2:
the room-temperature modified sludge dehydrating agent provided by the embodiment comprises, by weight, 25 parts of calcium oxide, 18 parts of ferric chloride, 35 parts of modified starch, 18 parts of diatomite, 8 parts of volcanic rock, 25 parts of gelatin, 10 parts of polyacrylamide, 2 parts of bentonite, 2 parts of talcum powder, 3 parts of slag soil and 2 parts of chitosan.
The ferric salt is one or more of ferric trichloride, copperas and ferric sulfate.
The molecular weight of the polyacrylamide is 600-1800 ten thousand.
The preparation method comprises the steps of firstly adding 25 parts of calcium oxide, 18 parts of ferric chloride, 35 parts of modified starch, 18 parts of diatomite, 8 parts of volcanic rock, 2 parts of bentonite, 2 parts of talcum powder, 3 parts of muck and 2 parts of chitosan into a polymerization kettle, magnetically stirring for 15-20min, then adding 25 parts of gelatin and 10 parts of polyacrylamide, reacting for 3-4h, evaporating to dryness and preparing powder to obtain the normal-temperature modified sludge dehydrating agent.
Example 3:
the room-temperature modified sludge dehydrating agent provided by the embodiment comprises, by weight, 30 parts of calcium oxide, 20 parts of ferric chloride, 40 parts of modified starch, 20 parts of diatomite, 10 parts of volcanic rock, 30 parts of gelatin, 10 parts of polyacrylamide, 2 parts of bentonite, 3 parts of talcum powder, 5 parts of slag soil and 3 parts of chitosan.
The ferric salt is one or more of ferric trichloride, copperas and ferric sulfate.
The molecular weight of the polyacrylamide is 600-1800 ten thousand.
The preparation method comprises the steps of adding 30 parts of calcium oxide, 20 parts of ferric chloride, 40 parts of modified starch, 20 parts of diatomite, 10 parts of volcanic rock, 2 parts of bentonite, 3 parts of talcum powder, 5 parts of muck and 3 parts of chitosan into a polymerization kettle, magnetically stirring for 15-20min, adding 30 parts of gelatin and 10 parts of polyacrylamide, reacting for 3-4h, evaporating to dryness, and preparing powder to obtain the normal-temperature modified sludge dehydrating agent.
The method for using the room temperature modified sludge dewatering agent prepared in examples 1 to 3 comprises the following steps: 1. adding the normal-temperature modified sludge dehydrating agent and the powder slag into original sludge with the water content of 80-85%, then stirring at a high speed to form original sludge, pumping sludge slurry into a closed modification tank, and modifying the slurry by stirring at a high speed for 4 minutes, wherein in the process, the colloidal structure of the sludge is destroyed, and bound water in the sludge is released, so that the sludge particles are changed from hydrophilicity to hydrophobicity; 2. adding water accounting for about 30-50% of the weight of the original sludge into the original sludge, and continuously stirring to form sludge slurry; 3. pumping the modified slurry into a plate-and-frame filter press for pressurizing to enable the sludge slurry to undergo solid-liquid separation to form a sludge cake; 4. crushing the mud cakes, uniformly stacking the mud cakes, wherein the stacking height is 30-50cm, and drying the mud cakes by solar energy to obtain dried mud particles with the water content of about 35%; and finally, carrying out resource treatment in different directions according to the existing resources.
After the sludge is subjected to dehydration treatment, the sludge still needs to be further treated, the main treatment mode is landfill, composting, incineration, building materials or used for land improvement, landscaping and the like, the standards of landfill, incineration, brick making and landscaping are used as reference, the main technical indexes are shown in the following table 1, and the data in the table show that the indexes of water content, heavy metal and the like of the sludge treated by the sludge normal-temperature modification dehydration technology all meet the requirements of various national standards, and the organic matter content meets the requirements of landscaping.
TABLE 1 Main technical indices
Note: the actual index data is shown in a sludge detection report, and ND in the table indicates that the actual index data is not detected.
Claims (4)
1. A normal-temperature modified sludge dehydrating agent is characterized in that: the material comprises, by weight, 20-30 parts of calcium oxide, 15-20 parts of iron salt, 30-40 parts of modified starch, 15-20 parts of diatomite, 5-10 parts of volcanic rock, 20-30 parts of gelatin, 5-10 parts of polyacrylamide, 1-2 parts of bentonite, 2-3 parts of talcum powder, 2-5 parts of slag soil and 1-3 parts of chitosan.
2. The room temperature modified sludge dewatering agent according to claim 1, wherein: the ferric salt is one or more of ferric trichloride, copperas and ferric sulfate.
3. The room temperature modified sludge dewatering agent according to claim 1, wherein: the molecular weight of the polyacrylamide is 600-1800 ten thousand.
4. A method for preparing an ambient temperature modified sludge dewatering agent according to any one of claims 1 to 3, comprising the steps of: adding 20-30 parts of calcium oxide, 15-20 parts of ferric chloride, 30-40 parts of modified starch, 15-20 parts of diatomite, 5-10 parts of volcanic rock, 1-2 parts of bentonite, 2-3 parts of talcum powder, 2-5 parts of slag soil and 1-3 parts of chitosan into a polymerization kettle, magnetically stirring for 15-20min, adding 20-30 parts of gelatin and 5-10 parts of polyacrylamide, reacting for 3-4h, evaporating to dryness, and preparing into powder to obtain the normal-temperature modified sludge dehydrating agent.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110092570A (en) * | 2019-05-14 | 2019-08-06 | 吉林建筑大学 | A kind of sludge concentration and dewatering agent and preparation method thereof |
| CN111559846A (en) * | 2020-05-12 | 2020-08-21 | 中建六局水利水电建设集团有限公司 | River channel high-water-content sludge dewatering method |
| CN111718106A (en) * | 2020-06-30 | 2020-09-29 | 河北美卡诺生物科技有限公司 | Organic agent for reducing water content of sludge dehydration |
| CN113666609A (en) * | 2021-09-01 | 2021-11-19 | 内蒙古嗨泥环保科技有限公司 | Sludge dewatering treatment system and sludge treatment method |
| CN113800745A (en) * | 2021-09-06 | 2021-12-17 | 东莞市凯威尔环保材料有限公司 | Organic dehydrating agent for dredging sludge |
| CN114287316A (en) * | 2021-12-29 | 2022-04-08 | 中冶南方城市建设工程技术有限公司 | Method for preparing planting soil from river and lake sludge in sponge city system construction |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110092570A (en) * | 2019-05-14 | 2019-08-06 | 吉林建筑大学 | A kind of sludge concentration and dewatering agent and preparation method thereof |
| CN111559846A (en) * | 2020-05-12 | 2020-08-21 | 中建六局水利水电建设集团有限公司 | River channel high-water-content sludge dewatering method |
| CN111718106A (en) * | 2020-06-30 | 2020-09-29 | 河北美卡诺生物科技有限公司 | Organic agent for reducing water content of sludge dehydration |
| CN113666609A (en) * | 2021-09-01 | 2021-11-19 | 内蒙古嗨泥环保科技有限公司 | Sludge dewatering treatment system and sludge treatment method |
| CN113666609B (en) * | 2021-09-01 | 2022-06-10 | 内蒙古嗨泥环保科技有限公司 | Sludge dewatering treatment system and sludge treatment method |
| CN113800745A (en) * | 2021-09-06 | 2021-12-17 | 东莞市凯威尔环保材料有限公司 | Organic dehydrating agent for dredging sludge |
| CN114287316A (en) * | 2021-12-29 | 2022-04-08 | 中冶南方城市建设工程技术有限公司 | Method for preparing planting soil from river and lake sludge in sponge city system construction |
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Application publication date: 20200417 |