CN112479511A - Method for improving stabilization of heavy metal in sludge by using biomass - Google Patents
Method for improving stabilization of heavy metal in sludge by using biomass Download PDFInfo
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- CN112479511A CN112479511A CN202010619146.XA CN202010619146A CN112479511A CN 112479511 A CN112479511 A CN 112479511A CN 202010619146 A CN202010619146 A CN 202010619146A CN 112479511 A CN112479511 A CN 112479511A
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- sludge
- heavy metals
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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
- C02F11/02—Biological treatment
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Abstract
The invention discloses a method for improving the stabilization of heavy metals in sludge by using biomass, belonging to the technical field of environmental protection, and the method for improving the stabilization of the heavy metals in the sludge by using the biomass comprises the following steps: preparing materials: biochar, sludge, biological bacteria; mixing biological carbon: putting the biochar and the sludge into a stirring kettle together, flushing nitrogen until the oxygen is emptied, stirring at high temperature, and carrying out high-temperature reaction in an anaerobic environment to fully mix the sludge with the biochar; standing and cooling: after stirring and mixing are finished, standing and cooling are carried out; mixing biological bacteria: the method comprises the steps of adding biological bacteria, flushing oxygen in a stirring kettle, and stirring at constant temperature, adsorbing heavy metals in the sludge by using tea polyphenol and straws in the tea, so as to reduce the heavy metals in the sludge, and decomposing the heavy metals by using the biological bacteria, so as to stabilize the heavy metals in the sludge, thereby improving the treatment effect of the sludge.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a method for improving the stabilization of heavy metals in sludge by using biomass.
Background
Environmental protection generally refers to the collective name of various actions that human beings take to solve real or potential environmental problems, coordinate the relationship between human beings and the environment, protect the living environment of human beings, and guarantee the sustainable development of the economy and society. The method and means are engineering, administrative, economic, propaganda and education.
Sludge treatment is a process of carrying out reduction, stabilization and harmless treatment on sludge. The higher the degree of wastewater treatment, the more sludge residue will be produced to be treated. A general sewage treatment plant must be provided with a sludge treatment facility unless the sewage is treated using land treatment or a sewage pond. For modern sewage treatment plants, the treatment and disposal of sludge has become the most complex and costly part of the operation of sewage treatment systems.
The existing method for treating the heavy metals in the sludge mostly uses chemical agents to neutralize and decompose the heavy metals in the sludge, the dosage of the chemical agents needs to be accurately controlled during operation, the secondary pollution of the sludge caused by the excessive dosage of the chemical agents is prevented, and the heavy metals in the sludge cannot be effectively and stably treated.
Disclosure of Invention
The invention aims to provide a method for improving the stabilization of heavy metals in sludge by using biomass, and aims to solve the problems that the prior method for treating the heavy metals in the sludge, which is proposed in the background art, mostly uses chemical agents to neutralize and decompose the heavy metals in the sludge, the dosage of the chemical agents needs to be accurately controlled during operation, the secondary pollution of the sludge caused by excessive dosage of the chemical agents is prevented, and the heavy metals in the sludge cannot be effectively and stably treated.
In order to achieve the purpose, the invention provides the following technical scheme: a method for improving the stabilization of heavy metals in sludge by using biomass comprises the following steps:
s1: preparing materials: 40-50 parts of biochar, 100 parts of sludge and 15-20 parts of biological bacteria;
s2: mixing biological carbon: putting the biochar and the sludge into a stirring kettle together, flushing nitrogen until the oxygen is emptied, stirring at high temperature, and carrying out high-temperature reaction in an anaerobic environment to fully mix the sludge with the biochar;
s3: standing and cooling: after stirring and mixing, standing and cooling to 40-60 ℃;
s4: mixing biological bacteria: adding biological bacteria, flushing oxygen in the stirring kettle, stirring at constant temperature to mix the biological bacteria and the sludge mixed with the biochar, and degrading heavy metals in the sludge through the biological bacteria.
Preferably, the reaction temperature in the step S1 is 200-250 ℃, and the reaction time is 30-40 min.
Preferably, the biological bacteria in step S4 is one of bacillus, pseudomonas putida or spirulina.
Preferably, the biochar in the step S1 is prepared by pyrolyzing tea leaves and straws in a high-pressure reaction kettle.
Preferably, the ratio of the tea leaves to the straws is 1: 3.
Preferably, the straw is one of wheat straw, rice straw, corn straw, rape straw or cotton straw, and preferably one of corn straw or rice straw.
Preferably, the temperature of the high-temperature decomposition is 500-600 ℃, and the pressure is 2-3 MPa.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, tea polyphenol in tea and straws are used for adsorbing heavy metals in sludge so as to reduce the heavy metals in the sludge, and biological bacteria are used for decomposing the heavy metals so as to stabilize the heavy metals in the sludge and improve the sludge treatment effect.
Drawings
FIG. 1 is a flow chart of the stabilization method of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a method for improving the stabilization of heavy metals in sludge by using biomass, which can effectively stabilize the heavy metals in the sludge by using biochar and biological bacteria, please refer to figure 1,
the method for improving the stabilization of the heavy metals in the sludge by using the biomass comprises the following steps:
s1: preparing materials: 40-50 parts of biochar, 100 parts of sludge and 15-20 parts of biological bacteria
S2: mixing biological carbon: putting the biochar and the sludge into a stirring kettle together, charging nitrogen until the oxygen is emptied, stirring at high temperature, and carrying out high-temperature reaction in an oxygen-free environment to ensure that the sludge can be fully mixed with the biochar, wherein the reaction temperature is 200 ℃ and 250 ℃, and the reaction time is 30-40 min;
s3: standing and cooling: after stirring and mixing, standing and cooling to 40-60 ℃;
s4: mixing biological bacteria: adding biological bacteria, flushing oxygen in a stirring kettle, stirring at constant temperature to mix the biological bacteria and the sludge mixed with the biochar, and degrading heavy metals in the sludge by the biological bacteria, wherein the biological bacteria is one of bacillus, pseudomonas putida or spirulina;
the biochar is formed by placing tea and straws in a high-pressure reaction kettle and decomposing the tea and the straws in the environment with the temperature of 500-600 ℃ and the pressure of 2-3MPa, wherein the ratio of the tea to the straws is 1:3, the straws are one of wheat straws, rice straws, corn straws, rape straws or cotton straws, and the corn straws or the rice straws are preferably selected.
Example 1
The method for improving the stabilization of the heavy metals in the sludge by using the biomass comprises the following steps:
s1: preparing materials: 40 parts of biochar, 100 parts of sludge and 15 parts of biological bacteria
S2: mixing biological carbon: putting the biochar and the sludge into a stirring kettle together, flushing nitrogen until the oxygen is emptied, stirring at high temperature, and carrying out high-temperature reaction in an oxygen-free environment to ensure that the sludge can be fully mixed with the biochar, wherein the reaction temperature is 200 ℃ and the reaction time is 40 min;
s3: standing and cooling: after stirring and mixing are finished, standing and cooling are carried out, and the temperature is reduced to 40 ℃;
s4: mixing biological bacteria: adding biological bacteria, flushing oxygen in a stirring kettle, stirring at constant temperature to mix the biological bacteria and the sludge mixed with the biochar, and degrading heavy metals in the sludge by the biological bacteria, wherein the biological bacteria is one of bacillus, pseudomonas putida or spirulina;
the biochar is prepared by putting tea leaves and straws in a high-pressure reaction kettle and decomposing the tea leaves and the straws in the environment with the temperature of 500 ℃ and the pressure of 2MPa, wherein the ratio of the tea leaves to the straws is 1:3, the straws are one of wheat straws, rice straws, corn straws, rape straws or cotton straws, and the corn straws or the rice straws are preferably selected.
Example 2
The method for improving the stabilization of the heavy metals in the sludge by using the biomass comprises the following steps:
s1: preparing materials: 45 parts of biochar, 100 parts of sludge and 17 parts of biological bacteria
S2: mixing biological carbon: putting the biochar and the sludge into a stirring kettle together, flushing nitrogen until the oxygen is emptied, stirring at high temperature, and carrying out high-temperature reaction in an oxygen-free environment to ensure that the sludge can be fully mixed with the biochar, wherein the reaction temperature is 230 ℃ and the reaction time is 35 min;
s3: standing and cooling: after stirring and mixing are finished, standing and cooling are carried out, and the temperature is reduced to 50 ℃;
s4: mixing biological bacteria: adding biological bacteria, flushing oxygen in a stirring kettle, stirring at constant temperature to mix the biological bacteria and the sludge mixed with the biochar, and degrading heavy metals in the sludge by the biological bacteria, wherein the biological bacteria is one of bacillus, pseudomonas putida or spirulina;
the biochar is formed by placing tea leaves and straws in a high-pressure reaction kettle and decomposing the tea leaves and the straws in the environment with the temperature of 550 ℃ and the pressure of 2.5MPa, wherein the ratio of the tea leaves to the straws is 1:3, the straws are one of wheat straws, rice straws, corn straws, rape straws or cotton straws, and the corn straws or the rice straws are preferably selected.
Example 3
The method for improving the stabilization of the heavy metals in the sludge by using the biomass comprises the following steps:
s1: preparing materials: 50 parts of biochar, 100 parts of sludge and 20 parts of biological bacteria
S2: mixing biological carbon: putting the biochar and the sludge into a stirring kettle together, flushing nitrogen until the oxygen is emptied, stirring at high temperature, and carrying out high-temperature reaction in an oxygen-free environment to ensure that the sludge can be fully mixed with the biochar, wherein the reaction temperature is 250 ℃ and the reaction time is 30 min;
s3: standing and cooling: after stirring and mixing are finished, standing and cooling are carried out, and the temperature is reduced to 60 ℃;
s4: mixing biological bacteria: adding biological bacteria, flushing oxygen in a stirring kettle, stirring at constant temperature to mix the biological bacteria and the sludge mixed with the biochar, and degrading heavy metals in the sludge by the biological bacteria, wherein the biological bacteria is one of bacillus, pseudomonas putida or spirulina;
the biochar is prepared by putting tea leaves and straws in a high-pressure reaction kettle and decomposing the tea leaves and the straws in the environment with the temperature of 600 ℃ and the pressure of 3MPa, wherein the ratio of the tea leaves to the straws is 1:3, the straws are one of wheat straws, rice straws, corn straws, rape straws or cotton straws, and the corn straws or the rice straws are preferably selected.
To sum up, utilize tea polyphenol and straw in the tealeaves to adsorb the heavy metal in the mud to this reduces the heavy metal in the mud, and decompose the heavy metal through biological fungus, stabilize the heavy metal in the mud with this, improve the treatment effect of mud.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the embodiments disclosed herein may be used in any combination, provided that there is no structural conflict, and the combinations are not exhaustively described in this specification merely for the sake of brevity and conservation of resources. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (7)
1. A method for improving the stabilization of heavy metals in sludge by using biomass is characterized by comprising the following steps: the method for improving the stabilization of the heavy metals in the sludge by using the biomass comprises the following steps:
s1: preparing materials: 40-50 parts of biochar, 100 parts of sludge and 15-20 parts of biological bacteria;
s2: mixing biological carbon: putting the biochar and the sludge into a stirring kettle together, flushing nitrogen until the oxygen is emptied, stirring at high temperature, and carrying out high-temperature reaction in an anaerobic environment to fully mix the sludge with the biochar;
s3: standing and cooling: after stirring and mixing, standing and cooling to 40-60 ℃;
s4: mixing biological bacteria: adding biological bacteria, flushing oxygen in the stirring kettle, stirring at constant temperature to mix the biological bacteria and the sludge mixed with the biochar, and degrading heavy metals in the sludge through the biological bacteria.
2. The method for improving the stabilization of heavy metals in sludge by using biomass according to claim 1, wherein the method comprises the following steps: the reaction temperature in the step S1 is 200-250 ℃, and the reaction time is 30-40 min.
3. The method for improving the stabilization of heavy metals in sludge by using biomass according to claim 1, wherein the method comprises the following steps: the biological bacteria in the step S4 is one of bacillus, pseudomonas putida or spirulina.
4. The method for improving the stabilization of heavy metals in sludge by using biomass according to claim 1, wherein the method comprises the following steps: the biochar in the step S1 is prepared by pyrolyzing tea leaves and straws in a high-pressure reaction kettle.
5. The method for improving the stabilization of heavy metals in sludge by using biomass according to claim 4, wherein the method comprises the following steps: the ratio of the tea leaves to the straws is 1: 3.
6. The method for improving the stabilization of heavy metals in sludge by using biomass according to claim 4, wherein the method comprises the following steps: the straw is one of wheat straw, rice straw, corn straw, rape straw or cotton straw, preferably one of corn straw or rice straw.
7. The method for improving the stabilization of heavy metals in sludge by using biomass according to claim 4, wherein the method comprises the following steps: the high-temperature decomposition temperature is 500-600 ℃, and the pressure is 2-3 MPa.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115180786A (en) * | 2022-08-05 | 2022-10-14 | 南方海洋科学与工程广东省实验室(广州) | Method for fixing sludge heavy metals by natural calcium-based biochar |
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| CN101708936A (en) * | 2009-11-06 | 2010-05-19 | 海南福君生态环境科技有限公司 | Method for treating sludge with heavy metals exceeding standard |
| CN106976858A (en) * | 2017-03-06 | 2017-07-25 | 华南理工大学 | A kind of biological carbon preparation method and applications based on the remaining tealeaf residue of daily drunk tea |
| CN107935339A (en) * | 2017-10-27 | 2018-04-20 | 河海大学 | A kind of aquaculture pond bed mud heavy metal stabilizer, its production method and its application |
| CN110316921A (en) * | 2018-03-30 | 2019-10-11 | 福建鑫盛润环境咨询合伙企业(有限合伙) | A method of domestic sludge is disposed using superhigh temperature aerobic microbiological fermentation process |
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- 2020-07-01 CN CN202010619146.XA patent/CN112479511A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101708936A (en) * | 2009-11-06 | 2010-05-19 | 海南福君生态环境科技有限公司 | Method for treating sludge with heavy metals exceeding standard |
| CN106976858A (en) * | 2017-03-06 | 2017-07-25 | 华南理工大学 | A kind of biological carbon preparation method and applications based on the remaining tealeaf residue of daily drunk tea |
| CN107935339A (en) * | 2017-10-27 | 2018-04-20 | 河海大学 | A kind of aquaculture pond bed mud heavy metal stabilizer, its production method and its application |
| CN110316921A (en) * | 2018-03-30 | 2019-10-11 | 福建鑫盛润环境咨询合伙企业(有限合伙) | A method of domestic sludge is disposed using superhigh temperature aerobic microbiological fermentation process |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115180786A (en) * | 2022-08-05 | 2022-10-14 | 南方海洋科学与工程广东省实验室(广州) | Method for fixing sludge heavy metals by natural calcium-based biochar |
| CN115180786B (en) * | 2022-08-05 | 2024-02-20 | 南方海洋科学与工程广东省实验室(广州) | Method for fixing sludge heavy metals by natural calcium-based biochar |
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