CN111423081A - Method for in-situ remediation of sludge containing heavy metals - Google Patents
Method for in-situ remediation of sludge containing heavy metals Download PDFInfo
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- CN111423081A CN111423081A CN202010189087.7A CN202010189087A CN111423081A CN 111423081 A CN111423081 A CN 111423081A CN 202010189087 A CN202010189087 A CN 202010189087A CN 111423081 A CN111423081 A CN 111423081A
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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
- C02F11/008—Sludge treatment by fixation or solidification
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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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
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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
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for in-situ repairing sludge containing heavy metals, which comprises the following steps: 1, arranging waterproof curtains around the sludge pit; 2, dehydrating the sludge in the sludge pit by using a vacuumizing device; 3 adding a solidification stabilizing agent, and adopting an excavator and a strong stirring head to perform solidification stabilizing treatment on the sludge; and 4, performing standard treatment on the wastewater generated by dehydration. Through solidification and stabilization, the migration and the hazard of heavy metals in the sludge are effectively reduced, and the harmless treatment of the sludge is realized. The restoration method has the advantages of less disturbance to the sludge, less secondary pollution, simple operation and suitability for popularization.
Description
Technical Field
The invention belongs to the technical field of environmental remediation, and relates to a method for in-situ remediation of sludge containing heavy metals.
Background
The sludge containing heavy metals is mainly from the electroplating industry, the metal surface treatment industry, the printed circuit board industry and the like, and a large amount of wastewater containing heavy metals such as chromium, nickel, copper, zinc, iron and the like is generated in the industries. After the wastewater treatment, the heavy metal is transferred to the sludge to become sludge containing a large amount of heavy metal. Because of historical problems, these sludges are not handled timely and reasonably, and are basically directly dug and buried, and a large number of sludge pits are generated in disposal sites over the years. The untreated sludge has great potential safety and environmental protection hazards for the development of society and cities. The pollution to soil and underground water can be caused at any time, thereby threatening the health of human beings and hindering the economic development of the area. As cities develop and expand, the hazards of sludge dumps are gradually revealed. The premise of the resource utilization of the sludge is that the sludge must be subjected to harmless treatment.
Most of the sludge has high water content, the common sludge treatment modes at present comprise incineration, a high-temperature alkaline oxidation method, microbial degradation and the like, the incineration method has high treatment cost, the high-temperature alkaline oxidation method and the microbial method need to firstly excavate and dewater the sludge, on one hand, the excavation cost is high, and on the other hand, secondary pollution is easily caused to the surrounding environment in the excavation and dewatering processes.
For example, the patent numbers are: the name of the CN201610900026.0 patent is a Chinese patent of a chemical discharge comprehensive treatment system, and the treatment method of the sludge comprises the following steps: the sludge in the sewage treatment system is connected with the sludge storage tank through at least one sludge pump; the system comprises a sludge treatment system, a waste heat utilization system and a flue gas purification system, wherein the sludge treatment system comprises a drying system connected with a sludge storage tank, the drying system is sequentially connected with a sludge incineration system, the waste heat utilization system and the flue gas purification system, and the flue gas purification system comprises a semi-dry quenching deacidification tower, a bag-type dust collector, an SCR reactor, a washing tower and a heater which are sequentially connected; the waste gas treatment system comprises a gas collection device for collecting waste gas generated in the sewage treatment system and the sludge treatment system, and the gas collection system is sequentially connected with the biological deodorization system and the at least one stage of absorption gas chamber system. It can be seen that the sludge treatment mode is complex, the cost is high, and the popularization and the use are not facilitated.
Disclosure of Invention
The invention aims to solve the problems that aiming at the defects in the prior art, an innovative scheme is provided, and particularly a method for in-situ remediation of sludge containing heavy metals is provided, wherein firstly, a waterproof curtain is built around the sludge, so that on one hand, the diffusion of pollutants in the sludge is prevented, and on the other hand, the entering of surrounding water is prevented; utilize plastics drain bar to reduce mud moisture content through vacuum precipitation, later add the heavy metal curing agent, utilize excavator cooperation powerful stirring head to stir the mixture many times in place, can make heavy metal and curing agent fully react, form steady state material, guarantee that the heavy metal leaches concentration at the allowed limit, carry out coagulating sedimentation to the waste water that precipitation produced at last, discharge up to standard.
In order to solve the problems, the invention adopts the following scheme: the method for in-situ remediation of sludge containing heavy metals is characterized by comprising the following steps:
step 1, building a waterproof curtain: a circle of waterproof curtain is built around the periphery of the sludge pit by adopting stirring piles, and the depth of the waterproof curtain reaches a waterproof layer;
step 2, vacuum preloading dewatering: the method comprises the following steps of arranging a dewatering device, vertically arranging a plastic drainage plate at a sludge pit, arranging a sealing ditch at the periphery of the sludge pit, horizontally laying a vacuum tube, connecting the vacuum tube with the plastic drainage plate, laying a sealing film on the surface of the vacuum tube, burying the sealing film in the sealing ditch to ensure the sealing state, laying a water-vapor separation tube on the sealing film, connecting the water-vapor separation tube with the vacuum tube, installing a water-vapor separation tank, connecting the water-vapor separation tank with the water-vapor separation tube, sealing each pipeline, starting a vacuum pump connected with the vacuum tube and a drainage pump arranged in the water-vapor separation tank, and reducing;
step 3, sludge solidification and stabilization: removing the dewatering device, carrying out grid fine partitioning on the sludge pit subjected to vacuum preloading dewatering, adding a curing agent mixing agent into partitions, and stirring the curing agent mixing agent up and down by using a stirring device to fully mix the agent and the sludge; the sludge after adding the medicine and stirring is maintained for 5 to 20 days in situ; the stirring device is preferably a digger matched with a powerful stirring head;
and step 4, detection: the sludge is self-checked after a period of time of maintenance, if the heavy metal stabilization solidification effect does not reach the set target value of sludge stabilization solidification, secondary dosing proportion is designed, and secondary sludge stabilization construction is carried out until the set target value of sludge stabilization solidification is reached;
step 5, sewage treatment: heavy metal-containing sewage generated by sludge vacuum preloading precipitation is subjected to coagulating sedimentation and discharged after reaching standards.
According to the method for in-situ remediation of sludge containing heavy metals, firstly, a waterproof curtain is built around the sludge, so that on one hand, diffusion of pollutants in the sludge is prevented, and on the other hand, entry of surrounding water is prevented; the water content of the sludge is reduced by vacuum dewatering through a plastic drainage plate, then a heavy metal curing agent is added, and an excavator is matched with a strong stirring head to stir and mix the sludge for multiple times, so that the heavy metal and the curing agent can fully react to form a stable substance, the leaching concentration of the heavy metal is ensured to be in an allowable range, and finally, the waste water generated by dewatering is subjected to coagulating sedimentation and is discharged after reaching the standard;
further, the method for in-situ remediation of sludge containing heavy metals according to the above design scheme is characterized in that in step 1, the cement mixing amount is 15-20%, and adjacent mixing piles are mutually overlapped and sealed.
Further, the method for in-situ remediation of sludge containing heavy metals according to the above design scheme is characterized in that in step 2, the plastic drainage plates are arranged in a square shape, and the distance between the drainage plates is 0.8-1.5 m.
Further, the method for in-situ remediation of sludge containing heavy metals according to the design scheme is characterized in that in the step 2, the plastic drainage plate adopts a high-pressure polyethylene core plate and a terylene non-woven geotextile filter membrane. The width of the plate is 8-12 cm.
Further, the method for in-situ remediation of sludge containing heavy metals according to the above design scheme is characterized in that the sealing membrane in the step 2 is a three-layer polyethylene or polyvinyl chloride membrane.
Further, the method for in-situ remediation of sludge containing heavy metals according to the above design scheme is characterized in that the pressure of the vacuum pump in the step 2 is greater than 0.09 MPa.
Further, the method for in-situ remediation of sludge containing heavy metals according to the design scheme is characterized in that in the step 2, the water content of the sludge is controlled to be 50-60% through vacuum preloading and precipitation.
Further, the method for in-situ remediation of sludge containing heavy metals according to the above design scheme is characterized in that the curing agent in step 3 is one or more of quicklime, cement, bentonite and attapulgite, and the addition amount of the curing agent is 3% -10% of the mass of the sludge.
Further, according to the above design scheme, the method for in-situ remediation of sludge containing heavy metals is characterized in that the area of each block is 5m × 5m by partitioning in the step 3.
Further, the method for in-situ remediation of sludge containing heavy metals according to the above design scheme is characterized in that the stirring time in step 3 is 20-40 min.
Further, the method for in-situ remediation of sludge containing heavy metals according to the above design scheme is characterized in that the sewage treatment process in step 5 is as follows: the sewage firstly enters an adjusting tank to adjust the water quality and water quantity. And lifting the effluent of the regulating reservoir to a coagulation reaction unit by using a water pump, adding sodium hydroxide to regulate the pH value of the sewage to 6-9, and reacting heavy metal ions with OH & lt- & gt to generate precipitate. And lifting the reacted wastewater to a sedimentation tank by a water pump, adding a heavy metal catching agent and a flocculating agent to destabilize colloid in the wastewater, and further removing heavy metal, SS and the like. And after the effluent of the sedimentation tank is filtered by the quartz sand filtering unit to remove the tiny suspended matters, the effluent reaches the standard and is discharged.
The invention has the following technical effects: the sludge treatment method of the invention does not need to excavate, and carries out dehydration and treatment on the sludge in situ, thereby not only improving the chemical and physical characteristics of the sludge, reducing the water content of the sludge, improving the bearing capacity of the sludge and the like, but also eliminating the harm of heavy metals, wherein the heavy metals cannot be leached into the environment, thereby being harmless to the environment and avoiding secondary pollution.
The sludge disposal method not only solves the problems of hidden danger and the like existing in sludge pits, but also saves a large amount of land for cities.
The invention discloses a method for in-situ repairing sludge containing heavy metals, which comprises the following steps: 1, arranging waterproof curtains around the sludge pit; 2, dehydrating the sludge in the sludge pit by using a vacuumizing device; 3 adding a solidification stabilizing agent, and adopting an excavator and a strong stirring head to perform solidification stabilizing treatment on the sludge; and 4, performing standard treatment on the wastewater generated by dehydration. Through solidification and stabilization, the migration and the hazard of heavy metals in the sludge are effectively reduced, and the harmless treatment of the sludge is realized. The restoration method has the advantages of less disturbance to the sludge, less secondary pollution, simple operation and suitability for popularization.
Drawings
FIG. 1 is a flow diagram of a method for in situ remediation of heavy metal-containing sludge.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the method of the present invention is further described in detail below with reference to specific examples.
Example 1:
the pollution condition of heavy metal lead, zinc and chromium in a certain sludge pit is shown in the following table, the initial water content of the sludge is 75-82%, and the thickness of a sludge layer is 6m deepest.
| Serial number | Item | Leaching concentration mg/L |
| 1 | Chromium (III) | 10.39 |
| 2 | Lead (II) | 6.45 |
| 3 | Zinc | 36.12 |
The method comprises the following specific operation steps:
(1) firstly, a waterproof curtain is arranged around the periphery of the sludge pit by adopting cement mixing piles, the cement mixing amount is 15%, and the depth of the waterproof curtain is 8 m.
(2) Vacuum dewatering: plastics drain bar interval 2m, the degree of depth reaches sludge blanket deepest thickness 6m, the vacuum tube is laid to the level, the vacuum tube links to each other with the plastics drain bar, polyvinyl chloride seal membrane is laid on the surface, the seal membrane is buried in sealed ditch, lay the steam separation pipe on the seal membrane, the steam separation pipe links to each other with the vacuum tube, install the aqueous vapor knockout drum, the aqueous vapor knockout drum links to each other with the steam separation pipe, after the pipe connection is good, start the vacuum pump of being connected with the vacuum tube and set up the drain pump in the aqueous vapor knockout drum, vacuum pump pressure 0.09 MPa. The water content of the sludge is 55% after the precipitation.
(3) And (3) removing the vacuum preloading dewatering device, adding the solidification and stabilization agents of quicklime and cement in a subarea manner, wherein the addition amount is 2% of the mass of the sludge, mixing and stirring the agents and the sludge by using an excavator and a powerful stirring head, and after 7 days of maintenance, sampling and detecting results are shown in the table below, so that the target repairing value specified in the site is reached.
| Serial number | Contaminants | Leaching repair target value mg/L | The leaching concentration after the treatment is mg/L | Whether it reaches the standard |
| 1 | Chromium (III) | 0.1 | 0.07 | Is that |
| 2 | Lead (II) | 0.1 | 0.05 | Is that |
| 3 | Zinc | 1.0 | 0.8 | Is that |
(4) Heavy metal sewage of vacuum preloading precipitation firstly enters a regulating tank to regulate the water quality and water quantity. And lifting the effluent of the regulating reservoir to a coagulation reaction unit by using a water pump, adding sodium hydroxide to regulate the pH value of the sewage to 8, and reacting heavy metal ions with OH < - > to generate precipitate. And lifting the reacted wastewater to a sedimentation tank by a water pump, adding a heavy metal catching agent and a flocculating agent to destabilize colloid in the wastewater, and further removing heavy metal, SS and the like. And after the effluent of the sedimentation tank is filtered by the quartz sand filtering unit to remove micro suspended matters, the effluent is finally discharged after reaching the standard.
Claims (10)
1. The method for in-situ remediation of sludge containing heavy metals is characterized by comprising the following steps:
step 1, building a waterproof curtain: a circle of waterproof curtain is built around the outside of the sludge pit by adopting stirring piles, and the depth reaches a waterproof layer;
step 2, vacuum preloading dewatering: the method comprises the following steps of arranging a dewatering device, vertically arranging a plastic drainage plate in a sludge pit, horizontally laying a vacuum tube, connecting the vacuum tube with the plastic drainage plate, laying a sealing film on the surface layer, arranging a sealing ditch at the periphery of the sludge pit, burying the sealing film in the sealing ditch, ensuring the sealing state, laying a water-vapor separation tube on the sealing film, connecting the water-vapor separation tube with the vacuum tube, installing a water-vapor separation tank, connecting the water-vapor separation tank with the water-vapor separation tube, sealing each pipeline, starting a vacuum pump connected with the vacuum tube and a drainage pump arranged in the water-vapor separation tank, and reducing the water content;
step 3, sludge solidification and stabilization: removing the dewatering device, carrying out grid fine partitioning on the sludge pit subjected to vacuum preloading dewatering, adding a curing agent mixing agent into partitions, and stirring the curing agent mixing agent up and down by using a stirring device to fully mix the agent and the sludge; the sludge after adding the medicine and stirring is maintained for 5 to 20 days in situ;
and step 4, detection: the sludge is self-checked after a period of time of maintenance, if the heavy metal stabilization solidification effect does not reach the set target value of sludge stabilization solidification, secondary dosing proportion is designed, and secondary sludge stabilization construction is carried out until the set target value of sludge stabilization solidification is reached;
step 5, sewage treatment: heavy metal-containing sewage generated by sludge vacuum preloading precipitation is subjected to coagulating sedimentation and discharged after reaching standards.
2. The method for repairing sludge containing heavy metals in situ according to claim 1, wherein in the step 1, the cement content of the waterproof curtain mixing piles is 15-20%, and adjacent mixing piles are mutually lapped and sealed.
3. The method for in-situ remediation of sludge containing heavy metals as claimed in claim 1, wherein in step 2, the plastic drainage plates are arranged in a square, and the distance between the drainage plates is 0.8-1.5 m.
4. The method for in-situ remediation of sludge containing heavy metals as claimed in claim 1, wherein in step 2, the plastic drainage plate is a high pressure polyethylene core plate, a terylene non-woven geotextile filter membrane, and the plate width is 8-12 cm.
5. The method for in-situ remediation of sludge containing heavy metals as claimed in claim 1, wherein in step 2, the sealing membrane is made of three layers of polyethylene or polyvinyl chloride.
6. The method for in-situ remediation of sludge containing heavy metals according to claim 1, wherein the vacuum pump pressure in step 2 is greater than 0.09 MPa.
7. The method for in-situ remediation of sludge containing heavy metals according to claim 1, wherein the water content of the sludge is controlled to be 50-60% by vacuum preloading and dewatering in step 2.
8. The method for in-situ remediation of sludge containing heavy metals according to claim 1, wherein the curing agent in step 3 is one or more of quicklime, cement, bentonite and attapulgite, and the addition amount of the curing agent is 3% -10% of the mass of the sludge.
9. The method for in-situ remediation of sludge containing heavy metals according to claim 1, wherein the area of each block in the partition in step 3 is 5m × 5m, and the stirring time in step 3 is 20-40 min.
10. The method for in-situ remediation of sludge containing heavy metals according to claim 1, wherein the wastewater treatment process of step 5 is: the sewage firstly enters an adjusting tank to adjust the water quality and the water quantity; lifting the effluent of the regulating reservoir to a coagulation reaction unit by using a water pump, adding sodium hydroxide to regulate the pH value of the sewage to 6-9, and reacting heavy metal ions with OH & lt- & gt to generate a precipitate; lifting the reacted wastewater to a sedimentation tank by a water pump, adding a heavy metal catching agent and a flocculating agent to destabilize colloid in the wastewater, and further removing heavy metal and SS; and after the effluent of the sedimentation tank is filtered by the quartz sand filtering unit to remove micro suspended matters, the effluent is finally discharged after reaching the standard.
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| CN202010189087.7A CN111423081A (en) | 2020-03-17 | 2020-03-17 | Method for in-situ remediation of sludge containing heavy metals |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114991113A (en) * | 2022-06-29 | 2022-09-02 | 煜环环境科技有限公司 | Temporary storage site sludge remediation treatment method |
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| KR100796722B1 (en) * | 2006-12-29 | 2008-01-24 | 한국지질자원연구원 | Method for solidifying sewage sludge |
| CN103466843A (en) * | 2013-10-08 | 2013-12-25 | 宜兴市欧瑞特环保科技有限公司 | Technology and device for treating heavy metal ion wastewater |
| CN106988295A (en) * | 2017-03-21 | 2017-07-28 | 中交天津港湾工程研究院有限公司 | The processing method and its processing equipment of sludge dewatering and solidification are carried out using ground treatments |
| CN107983761A (en) * | 2017-11-17 | 2018-05-04 | 北京高能时代环境技术股份有限公司 | The method for repairing and constructing of heavy metal and VOCs combined contamination soils |
| CN109516657A (en) * | 2017-09-18 | 2019-03-26 | 宁波瑞创环保科技有限公司 | A kind of solidification of sludge in-situ and stabilization treatment method |
-
2020
- 2020-03-17 CN CN202010189087.7A patent/CN111423081A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100796722B1 (en) * | 2006-12-29 | 2008-01-24 | 한국지질자원연구원 | Method for solidifying sewage sludge |
| CN103466843A (en) * | 2013-10-08 | 2013-12-25 | 宜兴市欧瑞特环保科技有限公司 | Technology and device for treating heavy metal ion wastewater |
| CN106988295A (en) * | 2017-03-21 | 2017-07-28 | 中交天津港湾工程研究院有限公司 | The processing method and its processing equipment of sludge dewatering and solidification are carried out using ground treatments |
| CN109516657A (en) * | 2017-09-18 | 2019-03-26 | 宁波瑞创环保科技有限公司 | A kind of solidification of sludge in-situ and stabilization treatment method |
| CN107983761A (en) * | 2017-11-17 | 2018-05-04 | 北京高能时代环境技术股份有限公司 | The method for repairing and constructing of heavy metal and VOCs combined contamination soils |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114991113A (en) * | 2022-06-29 | 2022-09-02 | 煜环环境科技有限公司 | Temporary storage site sludge remediation treatment method |
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Application publication date: 20200717 |