WO2020073609A1 - Dispositif de assainissement de sol pour sol contaminé par des métaux lourds - Google Patents

Dispositif de assainissement de sol pour sol contaminé par des métaux lourds Download PDF

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Publication number
WO2020073609A1
WO2020073609A1 PCT/CN2019/078641 CN2019078641W WO2020073609A1 WO 2020073609 A1 WO2020073609 A1 WO 2020073609A1 CN 2019078641 W CN2019078641 W CN 2019078641W WO 2020073609 A1 WO2020073609 A1 WO 2020073609A1
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WIPO (PCT)
Prior art keywords
sludge
mud
pipe
screen
leaching
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PCT/CN2019/078641
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English (en)
Chinese (zh)
Inventor
武涛
黄亭
李克军
许盛凯
朱耀
张攀峰
郑虎
Original Assignee
江苏澳洋生态园林股份有限公司
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Publication of WO2020073609A1 publication Critical patent/WO2020073609A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/08—Reclamation of contaminated soil chemically

Definitions

  • the invention relates to a soil remediation device, in particular to a soil remediation device contaminated with heavy metals.
  • water pollution mainly refers to water bodies (including rivers, lakes, reservoirs, oceans and industrial water, discharge water and drinking water, etc.) are polluted by heavy metal pollutants, including cadmium, lead, mercury, chromium, arsenic, etc., pollution sources It is mainly industrial wastewater, such as waste water discharged from mineral processing plants, electroplating plants, and steel plants.
  • Soil heavy metal pollution mainly comes from three aspects: heavy metal sedimentation in the atmosphere, for example, exhaust gas from industrial production and lead-containing automobile exhaust gas enter the soil through natural sedimentation and rain precipitation; irrigation with heavy metal-containing sewage causes heavy Cd in the soil , As, Cu and other contents increased; in addition, daily use of plastic thin film, agricultural applications of fertilizers and pesticides also lead to soil pollution.
  • the object of the present invention is to provide a soil remediation device for soil contaminated by heavy metals.
  • the contaminated soil is excavated and then tapped into mud to pass into the leaching tank, and then leaching chemicals are added to the mud for leaching ,
  • the soil after washing is separated into mud and water.
  • the separated soil enters the wet and dry mixer, and is mixed with the sludge produced by the sludge dehydration and drying device, and then discharged for aerobic composting, and finally forms soil rich in organic matter. Backfill into contaminated areas or sell as nutritious soil.
  • the soil remediation device includes a mud tank 1, a rinse tank 2, a wet and dry mixer 3, a sludge dehydration and drying device 4; a base 5 and a mud inlet pipe 601, a mud return pipe 602, a sludge bidirectional pipe 603, a rinse Sludge discharge pipe 604, sludge dewatering and drying sludge pipe 605;
  • the soil to be treated is put into the mud tank 1, after the preparation of the mud is completed, it enters the washing tank through the mud inlet pipe 601 for washing, and the washed sludge is discharged into the wet and dry sludge through the washing sludge outlet pipe 604 Mixer 3;
  • the remaining sludge processed by the sludge dewatering and drying device enters the dry and wet sludge mixer 3 through the dewatering and drying sludge pipe 605 to be mixed with the washed sludge, and the mixed sludge is discharged.
  • the upper part of the leaching tank is provided with a horizontal filter screen 202, and when the mud inlet pipe 201 provided at the top of the leaching tank passes the mud into the leaching tank, the filter screen performs preliminary filtering on the filter screen.
  • a cylindrical screen 209 is provided below the one, and the top of the cylindrical screen is opened, and the opening is a trumpet shape with a large upper and lower small, used to receive the mud filtered by the filter screen one, the cylindrical screen from top to A number of horizontal screens are provided below to filter the mud layer by layer to achieve graded washing of mud particles.
  • the upper part of the washing tank is provided with a stirring device 205, and the paddles of the stirring device are arranged inside the cylindrical screen; the shower A cylindrical screen driving device 208 is provided at the bottom of the washing tank for driving the rotation of the cylindrical screen;
  • a dosing tube 206 is provided between the top cover of the leaching tank and the first screen, and a plurality of horizontal screens provided in the cylindrical screen are correspondingly provided with a number of mud outlet pipes 207 for grading discharge through the leaching
  • the mud enters the leaching sludge discharge pipe 604; the mud discharge pipe 207 is provided with a detection device for detecting the concentration of pollutants in the sludge;
  • an aperture of the screen is 10-20mm;
  • the plurality of horizontal screens include screen two 203 and screen three 204; the screen two aperture is 2mm-10mm, the screen three aperture is 0.5mm-2mm, and the cylindrical screen aperture is less than 0.5mm;
  • the concentration of the pollutants detected by the detection device satisfies the subsequent processing procedure, and the qualified mud is passed through the sludge discharge pipe 604 to pass into the dry and wet mixer 3 through the mixed sludge into the mud pipe 603.
  • the remaining sludge processed by the sludge dewatering and drying device is passed into the dry-wet mixer 3 through the dewatering and drying sludge pipe 605 to achieve the mixing of qualified mud and remaining sludge.
  • An agitator 301 is provided in the wet and dry mixer, and the agitator 301 is provided with a plurality of agitating blades;
  • the diameter of the horizontal screen provided in the leaching tank gradually decreases from top to bottom.
  • a detection device is provided on the mud discharge pipe provided on the conical bottom;
  • the detection device detects that the concentration of pollutants in the sludge does not meet the subsequent concentration requirements, and then passes the unqualified sludge through the sludge sludge outlet pipe 604 into the mud return pipe 602 and returns to the mud inlet pipe 201 for further showering Wash treatment
  • the contaminated soil and the remaining sludge are mixed in a 1: 1 ratio of dry weight
  • the soil remediation device is provided with an automatic control system.
  • the automatic control system includes: a moisture meter and a temperature meter provided on the mud tank, the leaching tank, the wet and dry mixer, and the sludge dehydration and drying device, and the automatic control system is connected
  • the dosing device on the dosing tube 206; the mud inlet pipe 601, the mud return pipe 602, the mixed sludge inlet mud pipe 603, the leaching sludge outlet pipe 604, the sludge pump and the dewatering and drying sludge
  • a screw sludge discharge device is provided on the tube 605;
  • the automatic control system includes a signal output control unit, which controls the sludge pump, the dosing device, and the screw sludge discharge device after data analysis, and the automatic control system passes multiple measurement indicators Realize automatic control of soil remediation devices;
  • leaching agents for soils containing Cd, Cu, Pb, or Zn, the organic complexing agent EDTA with a concentration of 0.05 mol / L is used for leaching.
  • citric acid with a concentration of 0.1-0.3mol / L to rinse; for soil containing As, add an organic complexing agent EDTA with a concentration of 0.05-0.15mol / L to rinse, and then add a concentration of 0.20-0.30mol / L-oxalic acid leaching; for the soil containing mercury, three leaching agents of 0.2 mol / L organic complexing agent EDTA, 0.15-0.23 mol / L oxalic acid, 0.1-0.25 mol / LKI solution are leached in order wash.
  • the top of the eluent tank is provided with an eluent rich in heavy metals, and is subjected to heavy metal recovery treatment; and the recovered eluent is passed into a medicine adding tube to add medicine.
  • the present invention is a device for soil heavy metal removal and increased soil organic matter content by soil leaching and residual sludge mixed composting, which can be widely applied to soil remediation sites contaminated by heavy metals. Compared with traditional processing technology, it has the following advantages:
  • composting the mixed mud and sludge can not only reduce the moisture content of the mud, but also increase the soil organic matter content and soil fertility. ;
  • EDTA can form a complex with most cationic heavy metals in the soil in a large pH range, greatly increasing the removal rate of heavy metals, and at the same time has little effect on the physical and chemical properties of the sediment. EDTA has low biodegradability and can be recycled and reused. When multiple heavy metals are contained, EDTA is used to remove Cd, Cu, Pb, Zn, oxalic acid is used to remove As, Cd, Cu, Zn, and KI is used to remove mercury to achieve the restoration of various heavy metals in contaminated sediment.
  • the device can be assembled modularly, the base is set on the motor vehicle compartment, and it can be mobilized according to the soil pollution status, which greatly improves the equipment mobility and does not cause secondary pollution to the surrounding environment.
  • FIG. 1 is a schematic diagram of the soil remediation device of the present invention
  • Figure 2 is a schematic diagram of a cylindrical screen:
  • the present invention includes a slurry tank 1, a rinse tank 2, a wet and dry mixer 3, a sludge dehydration and drying device 4; a base 5 and a slurry inlet pipe 601, a slurry return pipe 602, a sludge bidirectional pipe 603, a shower Sludge washing sludge outlet pipe 604, sludge dehydration and drying sludge pipe 605;
  • the soil to be treated is added to the mud tank 1, after the preparation of the mud is completed, it enters the leaching tank through the mud inlet pipe 601 for leaching, and after leaching
  • the sludge is discharged into the wet and dry sludge mixer 3 through the leaching sludge discharge pipe 604; the remaining sludge processed by the sludge dehydration and drying device enters the dry and wet sludge mixer through the dehydration and drying sludge pipe 605 3 Mix with the washed sludge and discharge the mixed sludge and
  • the upper part of the washing tank is provided with a horizontal filter screen 202, and when the mud inlet pipe 201 provided at the top of the washing tank passes the mud into the washing tank, the filter screen performs a preliminary filtering on it, under the filter screen 1.
  • a column-shaped screen 209 is provided. The top of the column-shaped screen is open. The opening is trumpet-shaped, and is used to receive mud filtered through the screen.
  • the column-shaped screen is provided with a number of top to bottom. The screen is placed horizontally to filter the mud layer by layer to achieve graded leaching of mud particles.
  • the upper part of the rinsing tank is provided with a stirring device 205, and the blades of the stirring device are arranged inside the cylindrical screen; the bottom of the rinsing tank A cylindrical screen driving device 208 is provided for driving the rotation of the cylindrical screen;
  • a dosing pipe 206 is provided between the top cover of the washing tank and the first screen, and a plurality of horizontal screens provided in the column screen are correspondingly provided with a plurality of mud outlet pipes 207, which are used to discharge the washed mud in stages. Leaching the sludge discharge pipe 604; a detection device is provided on the sludge discharge pipe 207 for detecting the concentration of pollutants in the sludge;
  • the plurality of horizontal screens include screen two 203 and screen three 204; the screen one has an aperture of 20 mm; the screen two has an aperture of 10 mm, the screen three has an aperture of 2 mm, and the cylindrical screen Aperture 0.5mm;
  • the concentration of the pollutants detected by the detection device meets the subsequent processing procedures, and the qualified mud is passed through the mud sludge discharge pipe 604 to the dry and wet mixer 3 through the mixed sludge inlet mud pipe 603. Simultaneously with the mixer 3, the remaining sludge processed by the sludge dewatering and drying device is passed through the dewatering and drying sludge pipe 605 into the dry and wet mixer 3 to achieve the mixing of qualified mud and remaining sludge.
  • An agitator 301 is provided in the wet and dry mixer, and the agitator 301 is provided with a plurality of agitating blades;
  • the diameter of the horizontal screen provided in the leaching tank gradually decreases from top to bottom, the bottom of the leaching tank is a tapered bottom, and a mud outlet pipe is provided in the tapered bottom to communicate with the sludge outlet pipe 604 , A detection device is provided on the mud discharge pipe provided on the conical bottom;
  • the detection device detects that the concentration of pollutants in the sludge does not meet the subsequent concentration requirements, and then passes the unqualified sludge through the sludge sludge outlet pipe 604 into the mud return pipe 602 to return to the mud inlet pipe 201 for further leaching treatment.
  • the contaminated soil and remaining sludge are mixed in a 1: 1 ratio of dry weight.
  • the heavy metal contaminated soil containing hexavalent chromium (0.24-0.35g / kg) and lead (0.48-0.53g / kg) is treated by the above-mentioned soil remediation device, after 1h of leaching and mixing with remaining sludge for composting, after treatment
  • the removal rate of hexavalent chromium in the soil reached 86.5%, and the removal rate of lead was 84.4%.
  • the specific embodiment is the same as that in Example 1, except that the soil is contaminated with cadmium (0.08-0.15g / kg), and the organic complexing agent EDTA with a concentration of 0.2mol / L, oxalic acid with a concentration of 0.15-0.23mol / L, and 0.1-0.25 are used.
  • the three leaching agents of mol / LKI solution were washed in sequence, and after composting with the remaining sludge, the concentration of mercury ions in the soil decreased by 86.8%.

Abstract

L'invention concerne un dispositif d'assainissement de sol destiné à un sol contaminé par des métaux lourds, comprenant un réservoir à vase (1), un réservoir de lixiviation (2), un mélangeur humide-sec (3), et un dispositif (4) de déshydratation et de séchage de boues ; une base (5) et un tuyau d'alimentation (601) en vase, un tuyau de retour (602) de vase, un tuyau à deux voies (603) de vase, un tuyau d'évacuation (604) de boues lixiviées, et un tuyau de déshydratation et de séchage (605) de boues. Le sol à traiter est placé dans le réservoir (1) à vase, et une fois la préparation de la vase achevée, cette dernière est introduite dans le réservoir de lixiviation (2) en vue d'une lixiviation dans le tuyau d'alimentation (601) en vase, et les boues lixiviées sont évacuées dans le mélangeur humide-sec (3) de boues par le tuyau d'évacuation (604) de boues lixiviées ; et les boues restantes traitées par l'intermédiaire du dispositif (4) de déshydratation et de séchage de boues sont introduites dans le mélangeur humide-sec (3) de boues par le tuyau de déshydratation et de séchage (605) de boues et sont mélangées avec les boues lixiviées, et les boues uniformément mélangées sont ensuite évacuées. Le dispositif peut non seulement réduire la teneur en humidité de la vase, mais peut également améliorer la teneur en matière organique et la fertilité du sol.
PCT/CN2019/078641 2018-10-08 2019-03-19 Dispositif de assainissement de sol pour sol contaminé par des métaux lourds WO2020073609A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811168026.1A CN109013683B (zh) 2018-10-08 2018-10-08 一种受重金属污染土壤的土壤修复装置
CN201811168026.1 2018-10-08

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112122322A (zh) * 2020-09-09 2020-12-25 季丹萍 一种污染土壤增肥修复系统及处理工艺

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CN109013683B (zh) * 2018-10-08 2019-12-03 江苏澳洋生态园林股份有限公司 一种受重金属污染土壤的土壤修复装置
CN110116131B (zh) * 2019-06-18 2021-10-08 合肥丽清环保设备有限公司 一种土壤重金属修复装置
CN111451258A (zh) * 2020-04-27 2020-07-28 浙江省环境工程有限公司 一种污染土壤-地下水一体化修复系统
CN111574005A (zh) * 2020-05-27 2020-08-25 湖北华德莱节能减排科技有限公司 一种盐碱化污泥处理方法
CN113617817B (zh) * 2021-07-09 2022-07-12 苏州市宏宇环境科技股份有限公司 一种用于处置重金属污染土壤淋洗尾土污泥的设备及方法
CN114195343A (zh) * 2021-12-28 2022-03-18 湖南大学 一种利用淋洗和堆置联合修复重金属污染底泥的方法

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112122322A (zh) * 2020-09-09 2020-12-25 季丹萍 一种污染土壤增肥修复系统及处理工艺
CN112122322B (zh) * 2020-09-09 2022-04-19 季丹萍 一种污染土壤增肥修复系统及处理工艺

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