CN111547965A - Method for extracting sludge organic carbon source by combining acid addition and ultrasonic - Google Patents
Method for extracting sludge organic carbon source by combining acid addition and ultrasonic Download PDFInfo
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- CN111547965A CN111547965A CN202010405644.4A CN202010405644A CN111547965A CN 111547965 A CN111547965 A CN 111547965A CN 202010405644 A CN202010405644 A CN 202010405644A CN 111547965 A CN111547965 A CN 111547965A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—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
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
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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
- C02F11/15—Treatment of sludge; Devices therefor by de-watering, drying or thickening by treatment with electric, magnetic or electromagnetic fields; by treatment with ultrasonic waves
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a method for extracting a sludge organic carbon source by combining acid addition and ultrasonic treatment, belonging to the application field of sewage treatment technology. The method can effectively crack the sludge, and the cracked sludge can be used as an external carbon source for sewage treatment so as to realize reduction and recycling of the sludge. According to the invention, organic acid is added into the sludge mixed liquor after gravity settling to primarily destroy the microbial cell structure, and then the sludge thalli are further broken by utilizing the chemical effect, the thermal effect and the mechanical effect of the ultrasonic wave to release the organic carbon source. The organic acid added in the invention can be used as a carbon source for biological denitrification, does not bring new pollution, simultaneously reduces the sound energy density and the ultrasonic time required by ultrasonic sludge disintegration, reduces energy consumption, and provides a low-cost method for extracting the organic carbon source by industrially disintegrating the sludge.
Description
The technical field is as follows:
the invention provides a method for extracting a sludge organic carbon source by combining acid addition and ultrasonic treatment, belonging to the application field of sewage treatment technology. The method can effectively crack the sludge, and the cracked sludge can be used as a carbon source for sewage treatment so as to realize reduction and recycling of the sludge.
With the acceleration of the urbanization process and the rapid development of the industry, the sewage production and discharge are greatly increased, the number of sewage treatment plants shows a rapid growth trend, the sludge production is also greatly increased as a derivative of sewage treatment, and 4000 ten thousand tons of sludge with the water content of 80% are produced in 2017. Therefore, the requirement for accelerating the construction of sludge treatment facilities is provided in China, but the harmless treatment rate of sludge in urban sewage plants in China is still less than 30% because the processes of aerobic fermentation, anaerobic digestion, dehydration, landfill, incineration and the like of sludge have a plurality of economic and technical problems in the popularization and application process in China, and the planning requirement is not met.
60-65% of sludge generated by a sewage treatment plant adopts sanitary landfill, 2-3% of sludge incineration and the like. The sanitary landfill area as the main treatment means is large, the transportation distance is long, the high water content and the high organic matter content of the sludge can cause the collapse of a sanitary landfill site, high-concentration percolate is generated, and the disposal cost is high. Sludge incineration has not been widely adopted because of high water content of sludge, low calorific value, and the possibility of generation of harmful substances such as dioxin. Generally, the methods do not meet the treatment requirements of sludge stabilization, harmlessness and resource utilization.
The sludge contains a large amount of organic matters, if the excess sludge is used as an organic carbon source for biological denitrification, the addition of an additional carbon source can be reduced, the operation cost is saved, the sludge treatment cost can be reduced, the sludge is treated by pollution, waste is changed into valuable, and the sludge can be recycled and stabilized. However, since sludge is mainly composed of protozoa, metazoan, bacteria, zoogloea and floc aggregates, and cannot be directly used as an organic carbon source, sludge needs to be pretreated to destroy the floc structure of sludge and the cell walls of sludge microorganisms, so that organic substances in sludge microorganism cells are released.
The ultrasonic method is a relatively effective method for breaking the sludge, and has the advantages of small occupied area of equipment, simple equipment, no pollution and the like. The principle is that under the action of high sound intensity, particularly in a low-medium frequency range, ultrasonic waves can generate a large number of cavitation holes with the service life of about 0.1 mu s in a water phase, the cavitation holes can generate transient strong pressure pulses at the moment of explosion, local high-temperature and high-pressure points are formed in a tiny space around the bubbles, the high-temperature and high-pressure points can cause a series of physical and chemical effects, and the hot points are rapidly cooled after microseconds. In the cooling process, strong shock waves and high-speed jet flows are generated, and the explosion of the micro bubbles can generate high-strength hydraulic shearing force, so that the microbial cells are broken, and organic substances of the microbial cells are released.
However, the ultrasonic method requires a higher sound energy density to break the sludge, and the high energy consumption caused by the method brings higher economic cost, so that the ultrasonic method is not widely applied all the time. Meanwhile, researches show that the addition of acid into the sludge can damage microbial cells.
The invention provides a method for extracting an organic carbon source from sludge by combining acid addition and ultrasonic treatment, which can effectively break the sludge and reduce the electric energy required by the ultrasonic treatment, and the prior art is not reported in the technical field of water treatment.
60-65% of sludge generated by a sewage treatment plant adopts sanitary landfill, 2-3% of sludge incineration and the like. The sanitary landfill area as the main treatment means is large, the transportation distance is long, the high water content and the high organic matter content of the sludge can cause the collapse of a sanitary landfill site, high-concentration percolate is generated, and the disposal cost is high. Sludge incineration has not been widely adopted because of high water content of sludge, low calorific value, and the possibility of generation of harmful substances such as dioxin. Generally, the methods do not meet the treatment requirements of sludge stabilization, harmlessness and resource utilization.
The sludge contains a large amount of organic matters, if the excess sludge is used as an organic carbon source for biological denitrification, the addition of an additional carbon source can be reduced, the operation cost is saved, the sludge treatment cost can be reduced, the sludge is treated by pollution, waste is changed into valuable, and the sludge can be recycled and stabilized. However, since sludge is mainly composed of protozoa, metazoan, bacteria, zoogloea and floc aggregates, and cannot be directly used as an organic carbon source, sludge needs to be pretreated to destroy the floc structure of sludge and the cell walls of sludge microorganisms, so that organic substances in sludge microorganism cells are released.
The ultrasonic method is a relatively effective method for breaking the sludge, and has the advantages of small occupied area of equipment, simple equipment, no pollution and the like. The principle is that under the action of high sound intensity, particularly in a low-medium frequency range, ultrasonic waves can generate a large number of cavitation holes with the service life of about 0.1 mu s in a water phase, the cavitation holes can generate transient strong pressure pulses at the moment of explosion, local high-temperature and high-pressure points are formed in a tiny space around the bubbles, the high-temperature and high-pressure points can cause a series of physical and chemical effects, and the hot points are rapidly cooled after microseconds. In the cooling process, strong shock waves and high-speed jet flows are generated, and the explosion of the micro bubbles can generate high-strength hydraulic shearing force, so that the microbial cells are broken, and organic substances of the microbial cells are released.
However, the ultrasonic method requires a higher sound energy density to break the sludge, and the high energy consumption caused by the method brings higher economic cost, so that the ultrasonic method is not widely applied all the time. Meanwhile, researches show that the addition of acid into the sludge can damage microbial cells.
The invention provides a method for extracting an organic carbon source from sludge by combining acid addition and ultrasonic treatment, which can effectively break the sludge and reduce the electric energy required by the ultrasonic treatment, and the prior art is not reported in the technical field of water treatment.
The invention content is as follows:
the invention aims to solve the problems of high sound energy density, long action time and high energy consumption in the conventional ultrasonic sludge cracking method, and provides a method for extracting an organic carbon source from sludge by combining acid addition and ultrasonic treatment. In particular to a method for adding organic acid into sludge and then carrying out ultrasonic treatment. The organic acid can destroy the stable structure of the microbial cells, and damage the cells. And then under the action of various effects such as the chemical effect, the thermal effect, the mechanical effect and the like of the ultrasonic wave, most of the organic carbon source in the sludge is released into the solution to be used as the organic carbon source for biological denitrification.
The invention is realized by the following technical scheme:
(1) taking sludge, performing gravity sedimentation, and removing supernatant;
(2) adding organic acid into the sludge treated in the step (1), adjusting the pH to 4-5, and reacting for 4-12 h;
(3) and (3) ultrasonically treating the sludge treated in the step (2) for 0.5 h, wherein the sound energy density is 0.5W/mL.
(4) And (4) standing and settling the sludge treated in the step (3) for 2 hours, and centrifuging, wherein the centrifuged supernatant is an organic carbon source for biological denitrification.
Preferably, in the step (1), the sludge is excess sludge produced by a municipal sewage treatment plant.
Preferably, in the step (1), the water content of the sludge is between 98.0% and 99.2%.
Preferably, in the step (1), the gravity settling time is 6-12 h.
Preferably, in step (2), the organic acid species are formic acid, acetic acid, propionic acid, citric acid, which may also serve as a carbon source by themselves.
Preferably, the organic acid in the step (2) is added by firstly stirring at a speed of 300-400 r/min for 1 min and then stirring at a speed of 50-100 r/min for 5 min, so that the concentration of the organic acid in the reaction system is prevented from being inconsistent.
Preferably, in step (3), the ultrasonic transducers are uniformly distributed in the reactor.
Preferably, the centrifugal speed in the step (4) is 3000-4000 r/min, and the centrifugal time is 10-15 min.
Compared with the prior art, the invention has the following outstanding advantages:
(1) the ultrasonic energy selected by the invention has lower density and shorter ultrasonic time, thereby reducing the electric energy consumed by ultrasonic and lowering the operation cost.
(2) The invention utilizes the organic acid to destroy the cell structure of the sludge thallus, so that the organic carbon source of the sludge cells is easier to dissolve out during the ultrasonic treatment, and meanwhile, the organic acid can also be used as the carbon source, thereby not bringing new pollution.
(3) The invention has the advantages of easy realization of reaction conditions, low equipment cost, small occupied area and easy application in engineering.
The specific implementation mode is as follows:
the technical solutions of the present invention will be described in detail with reference to specific examples, which should be understood as merely illustrative and not restrictive, and various equivalent modifications of the present invention, which fall within the scope of the appended claims, will be suggested to those skilled in the art after reading the present invention.
Example 1:
1L of original sludge is subjected to gravity settling for 8 hours, then supernatant is discarded, 200 mL of settled sludge is placed in a 250 mL beaker, the sludge is rapidly stirred by an electric stirrer, diluted acetic acid is added after 1 min, the pH value is adjusted to be 5, the rapid stirring is carried out for 1 min, and the slow stirring is carried out for 5 min. The reaction was allowed to proceed for 8 h at room temperature, and then the mixture was sonicated at an ultrasonic acoustic energy density of 0.5W/ml for 0.5 h. And precipitating the ultrasonic sludge mixed liquor for 2 hours, and then centrifuging at the rotating speed of 4000 r/min for 10 min. The supernatant after centrifugation can be used as a carbon source for biological denitrification. The supernatant after centrifugation was analyzed, and the result showed that the supernatant had a soluble COD of 6200 mg/L.
Example 2:
1L of original sludge is subjected to gravity settling for 6 hours, then supernatant is discarded, 200 mL of settled sludge is placed in a 250 mL beaker, the sludge is rapidly stirred by a magnetic stirrer, diluted formic acid is added after 1 min, the pH value is adjusted to be 4, the rapid stirring is carried out for 1 min, and the slow stirring is carried out for 5 min. The reaction was allowed to proceed at room temperature for 12 h, and then the mixture was sonicated with a sonication density of 0.5W/ml and a sonication time of 0.5 h. And precipitating the ultrasonic sludge mixed liquor for 2 hours, and then centrifuging at the rotating speed of 4000 r/min for 10 min. The supernatant after centrifugation can be used as a carbon source for biological denitrification. The supernatant after centrifugation was analyzed, and the result showed that the supernatant had a soluble COD of 7800 mg/L.
Claims (5)
1. A method for extracting an organic carbon source from sludge by combining acid addition and ultrasonic is characterized in that after sludge is subjected to gravity settling, organic acid is added into the sludge under the stirring condition to destroy the cell structure, the sludge is subjected to ultrasonic treatment after reaction for a period of time, so that the organic carbon source of microbial cells is released into a solution, and after standing settling or centrifugation, a supernatant becomes the organic carbon source for biological denitrification.
2. The method for extracting the organic carbon source from the sludge by combining acid addition and ultrasonic extraction as claimed in claim 1, wherein the gravity settling time is 6-12 h.
3. The method for extracting the organic carbon source from the sludge by combining acid addition and ultrasonic extraction as claimed in claim 1, wherein the adopted acid is one or more organic acids such as formic acid, acetic acid, propionic acid and citric acid, and the organic acid is added while stirring, and the pH is adjusted to 4-5.
4. The method for extracting the organic carbon source from the sludge by combining the acid addition and the ultrasonic extraction as claimed in claim 1, wherein the ultrasonic sound energy density is 0.5W/mL, and the ultrasonic time is 0.5 h.
5. The method for extracting the organic carbon source from the sludge by the combination of the acid addition and the ultrasonic wave as claimed in claim 1, wherein the centrifugal speed of the cracked mixed liquid is 3000-4000 r/min, and the centrifugal time is 10-15 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010405644.4A CN111547965A (en) | 2020-05-14 | 2020-05-14 | Method for extracting sludge organic carbon source by combining acid addition and ultrasonic |
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| CN202010405644.4A CN111547965A (en) | 2020-05-14 | 2020-05-14 | Method for extracting sludge organic carbon source by combining acid addition and ultrasonic |
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| CN111547965A true CN111547965A (en) | 2020-08-18 |
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| CN202010405644.4A Pending CN111547965A (en) | 2020-05-14 | 2020-05-14 | Method for extracting sludge organic carbon source by combining acid addition and ultrasonic |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116040897A (en) * | 2023-03-30 | 2023-05-02 | 中国市政工程华北设计研究总院有限公司 | Method for synchronously extracting organic carbon source in situ by removing dirt from river sediment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101531447A (en) * | 2009-03-13 | 2009-09-16 | 中山大学 | Probe type ultrasonic device for breaking sludge |
| CN102229463A (en) * | 2011-05-18 | 2011-11-02 | 北京市环境保护科学研究院 | System and method for obtaining carbon source by utilizing ultrasonic enhanced sludge hydrolysis |
| CN102583913A (en) * | 2012-01-09 | 2012-07-18 | 天津大学 | Method for pretreating sludge by reflux of fermentation liquor and application of method |
| CN107204479A (en) * | 2017-06-26 | 2017-09-26 | 河海大学 | A kind of method for being combined ultrasound and alkali promotion sludge microbe electrolytic hydrogen production |
-
2020
- 2020-05-14 CN CN202010405644.4A patent/CN111547965A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101531447A (en) * | 2009-03-13 | 2009-09-16 | 中山大学 | Probe type ultrasonic device for breaking sludge |
| CN102229463A (en) * | 2011-05-18 | 2011-11-02 | 北京市环境保护科学研究院 | System and method for obtaining carbon source by utilizing ultrasonic enhanced sludge hydrolysis |
| CN102583913A (en) * | 2012-01-09 | 2012-07-18 | 天津大学 | Method for pretreating sludge by reflux of fermentation liquor and application of method |
| CN107204479A (en) * | 2017-06-26 | 2017-09-26 | 河海大学 | A kind of method for being combined ultrasound and alkali promotion sludge microbe electrolytic hydrogen production |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116040897A (en) * | 2023-03-30 | 2023-05-02 | 中国市政工程华北设计研究总院有限公司 | Method for synchronously extracting organic carbon source in situ by removing dirt from river sediment |
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