CN112174468B - Sludge deep dehydration method based on sludge hydrothermal carbonization filtrate - Google Patents
Sludge deep dehydration method based on sludge hydrothermal carbonization filtrate Download PDFInfo
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- CN112174468B CN112174468B CN202011038545.3A CN202011038545A CN112174468B CN 112174468 B CN112174468 B CN 112174468B CN 202011038545 A CN202011038545 A CN 202011038545A CN 112174468 B CN112174468 B CN 112174468B
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- sludge
- hydrothermal carbonization
- filtrate
- carbonization filtrate
- water content
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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
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
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- 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)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a sludge deep dehydration method based on sludge hydrothermal carbonization filtrate, belonging to the technical field of environmental engineering; according to the invention, weakly acidic sludge hydrothermal carbonization filtrate is utilized to condition sludge with water content of 80%, then the temperature is further raised, strong base is added to further destroy extracellular polymers and cell walls of the sludge to release water therein, so that the purpose of deep dehydration of the sludge is realized, and the water content of the obtained sludge filter cake is below 60%.
Description
Technical Field
The invention belongs to the technical field of environmental engineering, and particularly relates to a sludge deep dehydration method based on sludge hydrothermal carbonization filtrate.
Background
The sludge has high water content and high organic matter content, and simultaneously contains a large amount of semisolid products of toxic and harmful substances, such as organic matters, heavy metals, pathogenic bacteria and the like, and if the semisolid products are not properly disposed, the semisolid products can cause serious harm to the environment. At present, the water content of engineering sludge subjected to mechanical filter pressing is 80-85%, and the high water content is not only unfavorable for subsequent treatment of the sludge, but also increases the sludge transportation cost.
Common sludge dewatering methods include a drying method, a framework material method, a hydrothermal method and the like. The drying method is a method for quickly evaporating water in the sludge by adopting a heating method, although the dehydration efficiency is high, the water content of the dehydrated sludge can be reduced to be very low, the investment is large, the operation cost is high, the treatment cost of each ton of sludge is over 500 yuan generally, and the generated volatile organic compounds have great influence on the surrounding environment; in the Fenton oxidation method and the derivative method thereof, the extracellular polymeric substances are oxidized by adopting the oxides to realize effective dehydration, and in order to effectively reduce the water content of the sludge, the reagent input amount is large, the cost is relatively large, and the Fenton oxidation method and the derivative method thereof are difficult to be applied to industrial sludge dehydration; the hydrothermal method is characterized in that sludge is heated under a closed condition, organic matters in the sludge are promoted to be hydrolyzed into a water phase at a certain temperature and under a certain pressure, so that the flocculation structure of the sludge is destroyed, the dehydration performance of the sludge is improved, the water content in the sludge is high, and the treatment cost is high due to the high hydrothermal carbonization temperature and high energy consumption.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a sludge deep dehydration method based on sludge hydrothermal carbonization filtrate. According to the invention, weakly acidic sludge hydrothermal carbonization filtrate is utilized to condition sludge with water content of 80%, then the temperature is further raised, strong base is added to further destroy extracellular polymers and cell walls of the sludge to release water therein, the purpose of deep dehydration of the sludge is realized, and the water content is below 60%.
The present invention achieves the above-described object by the following technical means.
A sludge deep dehydration method based on sludge hydrothermal carbonization filtrate specifically comprises the following steps:
adding sludge hydrothermal carbonization filtrate into a sludge raw material for conditioning, then adding strong base into the conditioned sludge, heating to 80-100 ℃ for hydrolysis, and finally performing mechanical filter pressing to perform solid-liquid separation on the sludge mixture to obtain a sludge filter cake with high solid content.
Further, the sludge hydrothermal carbonization filtrate is obtained by the following steps: carrying out hydrothermal carbonization on the sludge at 180 to 200 ℃, and collecting the filtrate after the reaction is finished.
Further, the temperature of the sludge hydrothermal carbonization filtrate is higher than 50 ℃, and the pH value is 5.5 to 6.5.
Further, the conditioning time is 45 to 90min.
Further, the mass ratio of the sludge to the hydrothermal carbonization filtrate of the sludge is 0.5 to 1.
Further, the strong base is one or more of sodium hydroxide, sodium carbonate and sodium bicarbonate.
Further, the addition amount of the strong base is 1 to 3 percent of the dry weight of the sludge.
Further, the hydrolysis time is 30 to 60min.
Further, the water content of the sludge filter cake with the high solid content is lower than 60%.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, a large amount of filtrate generated in the sludge hydrothermal carbonization engineering process is fully utilized, the weak acidity of the filtrate is utilized to condition the sludge raw material, then strong alkali is utilized to enhance the sludge hydrolysis, the water content of a sludge filter cake after reaction can be effectively reduced, the sludge hydrothermal carbonization treatment cost is reduced, and meanwhile, the excess filtrate generated after reaction can be used for preheating the sludge, is cooled and then returns to a sewage treatment pool, so that the sludge dehydration cost can be further reduced.
Detailed Description
The present invention is further illustrated by the following specific examples, but the scope of the invention is not limited thereto.
Example 1:
100 parts of sludge with the water content of 80 percent by mass, 0.2 part of sodium hydroxide and 100 parts of sludge hydrothermal carbonization filtrate are taken, firstly the sludge and the filtrate are added into a reaction kettle for conditioning, the conditioning time is set to be 45 minutes, the temperature is controlled to be more than 50 ℃, wherein the sludge hydrothermal carbonization filtrate is the filtrate obtained by the reaction of the sludge at 180 ℃, and the pH value is controlled to be 5.5-6.5. And (2) after conditioning the mud-water mixture, adding sodium hydroxide to ensure that the effective volume is 70%, raising the temperature to perform hydrothermal reaction, setting the hydrothermal reaction temperature to be 80 ℃, and performing mechanical filter pressing on the reacted mud-water mixture to obtain a filter cake of sludge and filtrate, wherein the water content of the filter cake is 53%. And (4) preheating the sludge by redundant filtrate, and returning the cooled filtrate to a sewage treatment tank for further treatment.
Example 2:
100 parts by mass of sludge with the water content of 80%, 0.4 part by mass of sodium hydroxide and 150 parts by mass of sludge hydrothermal carbonization filtrate are taken, firstly the sludge and the filtrate are added into a reaction kettle for conditioning, the conditioning time is set to be 70 minutes, the temperature is controlled to be more than 50 ℃, wherein the sludge hydrothermal carbonization filtrate is a filtrate obtained by the reaction of the sludge at 190 ℃, and the pH value is controlled to be 5.5 to 6.5. And (3) after conditioning the mud-water mixture, adding sodium hydroxide to ensure that the effective volume is 70%, raising the temperature to perform hydrothermal reaction, setting the hydrothermal reaction temperature to be 90 ℃, and performing mechanical filter pressing on the reacted mud-water mixture to obtain a filter cake and a filtrate of the sludge, wherein the water content of the filter cake is 55%. And (4) preheating the sludge by redundant filtrate, and returning the cooled filtrate to a sewage treatment pool for further treatment.
Example 3:
100 parts by mass of sludge with the water content of 80%, 0.6 part by mass of sodium hydroxide and 200 parts by mass of sludge hydrothermal carbonization filtrate are taken, firstly, the sludge and the filtrate are added into a reaction kettle for conditioning, the conditioning time is set to be 60 minutes, the temperature is controlled to be more than 50 ℃, the sludge hydrothermal carbonization filtrate is obtained by the reaction of the sludge at the temperature of 200 ℃, and the pH value is controlled to be 5.5-6.5. And (3) after conditioning the mud-water mixture, adding sodium hydroxide to ensure that the effective volume is 70%, raising the temperature to perform hydrothermal reaction, setting the hydrothermal reaction temperature to be 100 ℃, and performing mechanical filter pressing on the reacted mud-water mixture to obtain a filter cake and a filtrate of the sludge, wherein the water content of the filter cake is 52%. And (4) preheating the sludge by redundant filtrate, and returning the cooled filtrate to a sewage treatment tank for further treatment.
Comparative example 1:
100 parts by mass of sludge with the water content of 80% is taken, 200 parts by mass of distilled water is added, the sludge and the distilled water are added into a reaction kettle for hydrothermal carbonization reaction, the reaction temperature is set to be 100 ℃, the reaction time is 60 minutes, and the reacted sludge-water mixture is subjected to mechanical filter pressing to obtain a filter cake of the sludge and a filtrate, wherein the water content of the filter cake is 65%. And (4) preheating the sludge by redundant filtrate, and returning the cooled filtrate to a sewage treatment tank for further treatment.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (7)
1. A sludge deep dehydration method based on sludge hydrothermal carbonization filtrate is characterized by comprising the following steps:
carrying out hydrothermal carbonization on the sludge at 180-200 ℃, and collecting sludge hydrothermal carbonization filtrate after the reaction is finished;
adding sludge hydrothermal carbonization filtrate into a sludge raw material for conditioning, then adding strong base into the conditioned sludge, heating to 80-100 ℃ for hydrolysis, and finally performing mechanical filter pressing to perform solid-liquid separation on the sludge mixture to obtain a sludge filter cake with high solid content; the temperature of the sludge hydrothermal carbonization filtrate is higher than 50 ℃, and the pH value is 5.5 to 6.5.
2. The sludge deep dewatering method based on the sludge hydrothermal carbonization filtrate as claimed in claim 1, wherein the conditioning time is 45 to 90min.
3. The method for deeply dewatering the sludge based on the sludge hydrothermal carbonization filtrate as claimed in claim 1, wherein the mass ratio of the sludge to the sludge hydrothermal carbonization filtrate is 0.5 to 1.
4. The method for deeply dewatering sludge based on the sludge hydrothermal carbonization filtrate as claimed in claim 1, wherein the strong base is one or more of sodium hydroxide or sodium carbonate.
5. The method for deeply dewatering sludge based on the sludge hydrothermal carbonization filtrate as claimed in claim 1, wherein the addition amount of the strong base is 1 to 3% of the dry weight of the sludge.
6. The method for deeply dewatering the sludge based on the sludge hydrothermal carbonization filtrate as claimed in claim 1, wherein the hydrolysis time is 30 to 60min.
7. The method for deeply dewatering sludge based on hydrothermal carbonization filtrate of sludge as claimed in claim 1, wherein the water content of the sludge filter cake with high solid content is less than 60%.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102718384A (en) * | 2012-06-26 | 2012-10-10 | 深圳市环源科技发展有限公司 | Alkali adding catalytic thermal hydrolysis treatment method for sludge |
| CN103058472A (en) * | 2012-10-30 | 2013-04-24 | 天津城市建设学院 | Chemical conditioning method for improving dehydration property of surplus sludge |
| CN104291549A (en) * | 2014-09-28 | 2015-01-21 | 中国科学院生态环境研究中心 | Method for enhancing sludge dewatering by combining microwaves, acids and quick lime |
| CN108558162A (en) * | 2018-04-12 | 2018-09-21 | 大连理工大学 | A kind of method of excess sludge hydrothermal carbonization liquid recycling |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102718384A (en) * | 2012-06-26 | 2012-10-10 | 深圳市环源科技发展有限公司 | Alkali adding catalytic thermal hydrolysis treatment method for sludge |
| CN103058472A (en) * | 2012-10-30 | 2013-04-24 | 天津城市建设学院 | Chemical conditioning method for improving dehydration property of surplus sludge |
| CN104291549A (en) * | 2014-09-28 | 2015-01-21 | 中国科学院生态环境研究中心 | Method for enhancing sludge dewatering by combining microwaves, acids and quick lime |
| CN108558162A (en) * | 2018-04-12 | 2018-09-21 | 大连理工大学 | A kind of method of excess sludge hydrothermal carbonization liquid recycling |
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