CN112142278A - Electrodynamic force remediation method for heavy metal chromium in municipal domestic sludge - Google Patents
Electrodynamic force remediation method for heavy metal chromium in municipal domestic sludge Download PDFInfo
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- CN112142278A CN112142278A CN201910577145.0A CN201910577145A CN112142278A CN 112142278 A CN112142278 A CN 112142278A CN 201910577145 A CN201910577145 A CN 201910577145A CN 112142278 A CN112142278 A CN 112142278A
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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
- C02F11/006—Electrochemical treatment, e.g. electro-oxidation or electro-osmosis
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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
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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
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/46—Solid fuels essentially based on materials of non-mineral origin on sewage, house, or town refuse
-
- 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
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/08—Drying or removing water
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/28—Cutting, disintegrating, shredding or grinding
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/38—Applying an electric field or inclusion of electrodes in the apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treatment Of Sludge (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses an electrodynamic force repairing method for heavy metal chromium in municipal domestic sludge, which is suitable for removing heavy metal chromium in residual sludge of municipal sewage treatment plants of various scales, overcomes the defects of more labor consumption and more contact harmful substances in the traditional sludge heavy metal chromium removing technology, and embodies that the electrodynamic force repairing method has good on-site sludge heavy metal pollution repairing potential, higher repairing efficiency and reliability and has the advantages of stronger economic feasibility and environmental friendliness. After the heavy metal chromium in the excess sludge is subjected to electrodynamic force repairing treatment, the chromium in the sludge is well removed, the heavy metal chromium in the sludge is transferred to an anode tank, the chromium content in the sludge reaches the national standard requirement of urban sludge brickmaking, and the treated sludge can be directly used for brickmaking and fuel, so that the sludge recycling is realized.
Description
Technical Field
The invention relates to an electrodynamic force repairing method for heavy metal chromium in municipal domestic sludge.
Background
At present, municipal domestic sludge is treated mainly by landfill, incineration, composting and building materials. Because heavy metals cannot be degraded, the comprehensive utilization of excess sludge such as composting, building material manufacturing and the like forms more serious limitation; and the landfill and the incineration not only cause the waste of heavy metal resources, but also easily cause secondary pollution and generate new damage to the ecological environment. Under the circumstances, the problem that heavy metals in sludge are harmlessly treated and reach the recycling standard is urgently needed to be solved.
Chromium-containing sludge is accumulated and discharged in nature, not only pollutes underground water sources, but also has great harm to human bodies, animals and plants, and therefore, the chromium-containing sludge needs to be further treated. At present, the harmless treatment technology for the chromium-containing sludge at home and abroad is generally divided into two types, namely a recycling technology; the second is solidification stabilizing technology.
The former generally adopts a certain extracting agent to leach heavy metal chromium for reuse, such as ammonia leaching, acid leaching and the like, the leaching rate can reach more than 90 percent, although the harm of the heavy metal chromium to the environment can be greatly reduced, and a certain economic benefit can be obtained, the cost is increased by the reprocessing of the leaching solution and the reprocessing of residual acid and alkali liquor after chromium recovery. The latter belongs to a relatively mature solid waste treatment technology, but the limitation of the curing effect is obvious, the chromium leaching concentration is strictly limited, and once the chromium leaching concentration is exceeded, the ideal effect is difficult to achieve.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides an electrodynamic force repairing method of heavy metal chromium in municipal domestic sludge, and solves the problems in the background technology.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method for repairing heavy metal chromium in municipal domestic sludge by using the electrodynamic force comprises the following steps:
(1) sludge pretreatment: air-drying the residual sludge of the sewage treatment plant until the water content is not higher than 75%, and crushing the sludge by using a crusher until the particle size is 1.0-2.0 mm;
(2) preparation of a reactor: the reactor comprises a soil tank, two electrode tanks are respectively arranged at two ends of the soil tank, and electrolyte is filled in the electrode tanks; a partition board is arranged between the soil tank and the electrode tank, and a plurality of through holes with the diameter of 0.8-1.2 mm are formed in the partition board; two graphene electrode plates are respectively inserted into the two electrode grooves, and a direct-current power supply and a universal meter are connected between the two graphene electrode plates through leads;
(3) electric power restoration of sludge: adding the pretreated sludge into a sludge tank and adjusting the liquid level height of an electrolyte, setting the direct-current power supply voltage of the reactor in the step (2) to be 9.0-10V, the voltage gradient to be 1.5-2.5V/cm, and the running time to be 8-12 days to obtain the repaired sludge;
(4) and (3) detection: after the operation of the step (3) is finished, turning off a power supply, taking out the repaired sludge, naturally drying the sludge or drying the sludge at 80-90 ℃ to obtain the repaired sludge to be detected, and detecting the quality and the chromium content of the sludge; the residual amount of heavy metal chromium in the treated sludge meets the requirements of sludge quality for brickmaking in sludge disposal of municipal wastewater treatment plants (GB/T25031-2010), and the change of the residual sludge quality is less than 10%;
(5) regeneration: preparing fuel particles from the repaired sludge detected in the step (4).
In a preferred embodiment of the present invention, the electrode tank, the sludge tank and the partition are made of polyvinyl chloride.
In a preferred embodiment of the present invention, the diameter of the through hole is 0.5 to 1.0 mm.
In a preferred embodiment of the present invention, the through holes are uniformly distributed in the partition plate.
In a preferred embodiment of the present invention, the electrolyte is distilled water.
In a preferred embodiment of the invention, the step (3) is to add sludge into the sludge tank and compact the sludge, and add electrolyte into the electrode tank until the sludge in the sludge tank is completely wetted and is level with the liquid level in the two electrode tanks.
Compared with the background technology, the technical scheme has the following advantages:
the method for removing the heavy metal chromium in the domestic sludge overcomes the defects of more labor consumption, high cost, high risk and more harmful substances in contact in the traditional sludge heavy metal removal technology, and embodies the advantages of good industrial and site-oriented treatment potential, higher repair efficiency and safety, and stronger economic feasibility and environmental friendliness. After the heavy metal chromium in the sludge is electrically repaired, the heavy metal chromium is well removed, the removal rate exceeds 80%, the residual amount of the heavy metal chromium in the sludge reaches 'sludge quality for brickmaking by sludge disposal in municipal sewage treatment plants' (GB/T25031-2010), and the operation is simple, convenient and reliable.
Drawings
FIG. 1 is a process flow diagram of the method of the present invention.
Detailed Description
The invention is explained in detail below with reference to the drawings and examples:
example 1
Referring to fig. 1, the method for repairing heavy metal chromium in municipal sludge by electromotive force of this embodiment includes the following steps:
(1) sludge pretreatment: taking excess sludge of a sewage treatment plant in a certain city of Shandong province, air-drying until the water content is 75%, crushing by a crusher until the particle size is 1.5mm, and detecting the content of heavy metal chromium to be 349.45 mg/kg;
(2) preparation of a reactor: preparing a reactor by adopting a polyethylene material, wherein the reactor comprises a soil tank, two electrode tanks (namely an anode tank and a cathode tank) are respectively arranged at two ends of the soil tank, and distilled water is filled in the electrode tanks to be used as electrolyte; a partition board is arranged between the soil tank and the electrode tank, and 20 circular through holes with the aperture of 1.0mm are uniformly distributed on the partition board; two graphene electrode plates are respectively inserted into the two electrode grooves, and a direct-current power supply and a universal meter are connected between the two graphene electrode plates through leads;
(3) electric power restoration of sludge: adding sludge into the sludge tank, compacting, and adding distilled water into the electrode tank until the sludge in the sludge tank is completely wetted and is level to the liquid level of the two electrode tanks; setting the direct-current power supply voltage of the reactor in the step (2) to be 10.V, the voltage gradient to be 2.0V/cm and the running time to be 8 days to obtain the repaired sludge;
(4) and (3) detection: after the operation of the step (3) is finished, turning off a power supply, taking out the repaired sludge, and naturally drying to obtain the repaired sludge with the water content of 75% for detection;
(5) regeneration: preparing fuel particles from the repair sludge dried in the step (4).
And (4) analyzing results:
according to detection, heavy metal chromium in the sludge is well removed after electric remediation, the concentration of chromium in the sludge is 55.04mg/kg, the removal rate exceeds 80%, the residual amount of the heavy metal chromium in the treated sludge meets the requirements of sludge quality for brickmaking in sludge disposal of municipal sewage treatment plants (GB/T25031-2010), and the mass change of the residual sludge is less than 10%.
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims and their equivalents.
Claims (7)
1. An electrodynamic force repairing method for heavy metal chromium in municipal domestic sludge is characterized by comprising the following steps:
(1) sludge pretreatment: air-drying the residual sludge of the sewage treatment plant until the water content is not higher than 75%, and crushing the sludge by using a crusher until the particle size is 1.0-2.0 mm;
(2) preparation of a reactor: the reactor comprises a soil tank, two electrode tanks are respectively arranged at two ends of the soil tank, and electrolyte is filled in the electrode tanks; a partition board is arranged between the soil tank and the electrode tank, and a plurality of through holes with the diameter of 0.8-1.2 mm are formed in the partition board; two graphene electrode plates are respectively inserted into the two electrode grooves, and a direct-current power supply and a universal meter are connected between the two graphene electrode plates through leads;
(3) electric power restoration of sludge: adding the pretreated sludge into a sludge tank and adjusting the liquid level height of an electrolyte, setting the direct-current power supply voltage of the reactor in the step (2) to be 9.0-10V, the voltage gradient to be 1.5-2.5V/cm, and the running time to be 8-12 days to obtain the repaired sludge;
(4) and (3) detection: after the operation of the step (3) is finished, turning off a power supply, taking out the repaired sludge, naturally drying the sludge or drying the sludge at 80-90 ℃ to obtain repaired sludge to be detected, and detecting the quality and the chromium content of the residual sludge;
(5) sludge conditioning: preparing fuel particles from the repaired sludge detected in the step (4).
2. The method for electrokinetic remediation of heavy metal chromium in municipal sludge according to claim 1, wherein the electrokinetic remediation is characterized in that: the electrode tank, the sludge tank and the partition plate are made of polyvinyl chloride.
3. The method for electrokinetic remediation of heavy metal chromium in municipal sludge according to claim 1, wherein the electrokinetic remediation is characterized in that: the diameter of the through hole is 0.5-1.0 mm.
4. The method for electrokinetic remediation of heavy metal chromium in municipal sludge according to claim 1, wherein the electrokinetic remediation is characterized in that: the through holes are uniformly distributed in the partition plate.
5. The method for electrokinetic remediation of heavy metal chromium in municipal sludge according to claim 1, wherein the electrokinetic remediation is characterized in that: the electrolyte is distilled water.
6. The method for electrokinetic remediation of heavy metal chromium in municipal sludge according to claim 1, wherein the electrokinetic remediation is characterized in that: and (3) adding sludge into the sludge tank and compacting, and adding electrolyte into the electrode tanks until the sludge in the sludge tank is completely wetted and is flush with the liquid levels in the two electrode tanks.
7. The method for electrokinetic remediation of heavy metal chromium in municipal sludge according to claim 1, wherein the electrokinetic remediation is characterized in that: before and after the electrodynamic force repairing treatment in the step (3), the change of the sludge quality is less than 10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910577145.0A CN112142278A (en) | 2019-06-28 | 2019-06-28 | Electrodynamic force remediation method for heavy metal chromium in municipal domestic sludge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910577145.0A CN112142278A (en) | 2019-06-28 | 2019-06-28 | Electrodynamic force remediation method for heavy metal chromium in municipal domestic sludge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114573201A (en) * | 2022-04-20 | 2022-06-03 | 吉林大学 | Device for removing heavy metals in sludge in situ by electrically coupling graphene hydrogel |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5458747A (en) * | 1994-01-21 | 1995-10-17 | Electrokinetics, Inc. | Insitu bio-electrokinetic remediation of contaminated soils containing hazardous mixed wastes |
| CN101265007A (en) * | 2008-04-11 | 2008-09-17 | 同济大学 | Method for removing heavy metal in urban sludge by employing electric repairing technique |
| CN103183459A (en) * | 2011-12-29 | 2013-07-03 | 厦门兴之星环保科技有限公司 | Method for removing heavy metal from sludge of sewage treatment works |
| CN104386892A (en) * | 2014-11-21 | 2015-03-04 | 中国矿业大学 | Device for removing heavy metal in excess sludge by using electrodynamic force technology |
| CN105884157A (en) * | 2016-05-31 | 2016-08-24 | 浙江大学 | Method for removing and recovering heavy metal in sludge through electrolytic method |
| CN106904799A (en) * | 2015-12-22 | 2017-06-30 | 北京有色金属研究总院 | A kind of electro reclamation intensifying device and the method that Heavy Metals in Sludge is removed using the device |
| CN109174951A (en) * | 2018-07-19 | 2019-01-11 | 华侨大学 | A kind of Electroremediation method of hexavalent chromium polluted soil |
-
2019
- 2019-06-28 CN CN201910577145.0A patent/CN112142278A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5458747A (en) * | 1994-01-21 | 1995-10-17 | Electrokinetics, Inc. | Insitu bio-electrokinetic remediation of contaminated soils containing hazardous mixed wastes |
| CN101265007A (en) * | 2008-04-11 | 2008-09-17 | 同济大学 | Method for removing heavy metal in urban sludge by employing electric repairing technique |
| CN103183459A (en) * | 2011-12-29 | 2013-07-03 | 厦门兴之星环保科技有限公司 | Method for removing heavy metal from sludge of sewage treatment works |
| CN104386892A (en) * | 2014-11-21 | 2015-03-04 | 中国矿业大学 | Device for removing heavy metal in excess sludge by using electrodynamic force technology |
| CN106904799A (en) * | 2015-12-22 | 2017-06-30 | 北京有色金属研究总院 | A kind of electro reclamation intensifying device and the method that Heavy Metals in Sludge is removed using the device |
| CN105884157A (en) * | 2016-05-31 | 2016-08-24 | 浙江大学 | Method for removing and recovering heavy metal in sludge through electrolytic method |
| CN109174951A (en) * | 2018-07-19 | 2019-01-11 | 华侨大学 | A kind of Electroremediation method of hexavalent chromium polluted soil |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114573201A (en) * | 2022-04-20 | 2022-06-03 | 吉林大学 | Device for removing heavy metals in sludge in situ by electrically coupling graphene hydrogel |
| CN114573201B (en) * | 2022-04-20 | 2024-05-03 | 吉林大学 | Device for removing heavy metals in sludge through electric coupling graphene hydrogel in situ |
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Application publication date: 20201229 |