WO2020073609A1 - Soil remediation device for heavy metal-contaminated soil - Google Patents

Soil remediation device for heavy metal-contaminated soil Download PDF

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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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sludge
mud
pipe
screen
leaching
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PCT/CN2019/078641
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French (fr)
Chinese (zh)
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武涛
黄亭
李克军
许盛凯
朱耀
张攀峰
郑虎
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江苏澳洋生态园林股份有限公司
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Priority to CN201811168026.1A priority Critical patent/CN109013683B/en
Priority to CN201811168026.1 priority
Application filed by 江苏澳洋生态园林股份有限公司 filed Critical 江苏澳洋生态园林股份有限公司
Publication of WO2020073609A1 publication Critical patent/WO2020073609A1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C1/00Reclamation of contaminated soil
    • B09C1/02Extraction using liquids, e.g. washing, leaching, flotation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C1/00Reclamation of contaminated soil
    • B09C1/08Reclamation of contaminated soil chemically

Abstract

Disclosed is a soil remediation device for a heavy metal-contaminated soil, comprising a mud tank (1), a leaching tank (2), a wet-dry mixer (3), and a sludge dewatering and drying device (4); a base (5) and a mud inlet pipe (601), a mud backflow pipe (602), a sludge two-way pipe (603), a leached sludge-discharging pipe (604), and a sludge dewatering and drying sludge pipe (605). The soil to be treated is put into the mud tank (1), and after the preparation of mud is completed, the mud is introduced into the leaching tank (2) for leaching through the mud inlet pipe (601), and the leached sludge is discharged into the wet-dry sludge mixer (3) through the leached sludge-discharging pipe (604); and the remaining sludge treated via the sludge dewatering and drying device (4) is introduced into the wet-dry sludge mixer (3) through the dewatering and drying sludge pipe (605) and is mixed with the leached sludge, and the uniformly mixed sludge is then discharged. The device can not only reduce the moisture content of mud, but can also improve the organic matter content and the fertility of soil.

Description

一种受重金属污染土壤的土壤修复装置Soil repairing device for soil contaminated by heavy metals 技术领域Technical field
本发明涉及一种土壤修复装置,具体涉及一种受重金属污染土壤的土壤修复装置。The invention relates to a soil remediation device, in particular to a soil remediation device contaminated with heavy metals.
背景技术Background technique
当前治理重金属污染问题已成为全球亟待解决的一个环境问题。其中水污染主要指水体(包括河流、湖泊、水库、海洋以及工业用水、排放水和生活饮用水等)遭到重金属类污染物的污染,包括镉、铅、汞、铬、砷等,污染来源主要是工业废水,如选矿厂、电镀厂、钢铁厂等排放的废水。The current problem of controlling heavy metal pollution has become an environmental problem urgently to be resolved worldwide. Among them, 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.
土壤中的重金属除本身含有的重金属外,其余则是由于污染使重金属进入土壤中。土壤重金属污染主要来自3各方面:大气中重金属的沉降,例如,工业生产排放的废气、含铅汽车尾气等通过自然沉降和雨淋沉降进入土壤;采用含重金属的污水进行灌溉,导致土壤重Cd、As、Cu等含量的增加;另外,日常生活用的塑料簿膜、农业应用的化肥农药也导致土壤污染。In addition to the heavy metals contained in the soil, the heavy metals in the soil are caused by pollution and the heavy metals enter the soil. 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.
化学方法会对土壤性质产生破坏性影响,土壤中氮、磷及有机质随着淋洗等步骤流失,难以作为正常土壤回填,若大面积使用,难免造成水土流失现象产生。Chemical methods can have a destructive effect on soil properties. Nitrogen, phosphorus, and organic matter in the soil are lost through leaching and other steps, which are difficult to backfill as normal soil. If it is used in a large area, it will inevitably cause soil erosion.
近年来,植物修复技术在重金属污染修复方面已成为研究热点之一,相对于其它修复技术,它具有费用低、易于操作管理、不产生二次污染等特点,但是目前发现的大多数重金属富集植物繁殖能力弱、生长缓慢、地上部生物量小等,在实际应用中受到限制;加之土壤中大部分重金属呈与固相结合且难于被 修复植物吸收利用的状态,造成修复效率的低下以及修复时间较长,不适合长久的发展和使用。In recent years, phytoremediation technology has become one of the research hotspots in the remediation of heavy metal pollution. Compared with other remediation technologies, it has the characteristics of low cost, easy operation and management, and no secondary pollution. However, most of the heavy metals found so far are enriched Weak plant reproduction, slow growth, and small above-ground biomass are limited in practical applications; in addition, most of the heavy metals in the soil are in a solid state and are difficult to be absorbed by the repaired plants, resulting in low repair efficiency and repair Long time, not suitable for long-term development and use.
为此,在不影响土壤持续使用的前提下,我们提供一种受重金属污染土壤的土壤修复装置。Therefore, without affecting the continuous use of the soil, we provide a soil remediation device for soil contaminated by heavy metals.
发明内容Summary of the invention
本发明的目的是提供一种受重金属污染土壤的土壤修复装置,将受污染土壤挖掘后利用自来水配制成泥浆,将泥浆通入淋洗罐中,然后向泥浆中投加淋洗药剂进行淋洗,淋洗后的土壤进行泥水分离,分离后的土壤进入干湿混合器,与污泥脱水干化装置产出的污泥混合后,排出进行好氧堆肥,最终形成富含有机质的土壤,可以回填到污染区域或者作为营养土壤进行出售。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.
为了实现上述目的,本发明采取如下的技术解决方案:In order to achieve the above objectives, the present invention adopts the following technical solutions:
本土壤修复装置,包括泥浆罐1、淋洗罐2、干湿混合器3、污泥脱水干化装置4;底座5以及泥浆进管601、泥浆回流管602、污泥双向管603、淋洗污泥出泥管604、污泥脱水干化污泥管605;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;
待处理土壤投加入泥浆罐1中,泥浆制备完成后,通过泥浆进管601进入淋洗罐中进行淋洗,淋洗后的污泥通过淋洗污泥出泥管604排入干湿污泥混合器3;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;
经过污泥脱水干化装置处理后的剩余污泥经过脱水干化污泥管605进入干湿污泥混合器3与淋洗后的污泥进行混合,混均后的污泥排出。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.
进一步地,所述淋洗罐内上部设置横置式滤网一202,设置在淋洗罐顶部的泥浆进管201将泥浆通入淋洗罐时,滤网一对其进行初步过滤,在滤网一的下方设置有柱状筛网209,所述柱状筛网顶部开口,所述开口为上大下小的喇叭状,用于承接经滤网一过滤的泥浆,所述柱状筛网中由上至下设置若干横置筛网,对泥浆进行逐层过滤,实现泥浆颗粒分级淋洗,所述淋洗罐上部设置搅拌装置 205,所述搅拌装置的桨叶设置在柱状筛网内部;所述淋洗罐底部设置柱状筛网驱动装置208用于驱动柱状筛网的转动;Further, 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;
进一步地,所述淋洗罐顶盖与滤网一之间设置加药管206,所述柱状筛网中设置的若干横置筛网对应设置若干出泥管207,用于分级排出经过淋洗的泥浆进入淋洗污泥出泥管604中;所述出泥管207上设置检测装置,用于检测污泥中污染物浓度;Further, 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;
进一步地,所述筛网一孔径为10-20mm;Further, an aperture of the screen is 10-20mm;
进一步地,所述若干横置筛网包括筛网二203、筛网三204;所述筛网二孔径为2mm-10mm、筛网三孔径为0.5mm-2mm,柱状筛网孔径小于0.5mm;Further, 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;
进一步地,所述检测装置检测后的污染物浓度满足后续处理工序,经过淋洗污泥出泥管604将合格泥浆经混合污泥进泥管603通入干湿混合器3中,在合格泥浆进入干湿混合器3的同时,将经过污泥脱水干化装置处理后的剩余污泥经过脱水干化污泥管605通入干湿混合器3中,实现合格泥浆和剩余污泥的混合。所述干湿混合器中设置搅拌器301,所述搅拌器301设置多个搅拌桨叶;Further, 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. While entering the dry-wet mixer 3, 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;
所述淋洗罐内设置的横置筛网的孔径由上至下逐步变小,所述淋洗罐底部为锥形底,且锥形底设置出泥管连通淋洗污泥出泥管604,所述锥形底设置的出泥管上设置检测装置;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;
进一步地,所述检测装置检测污泥中污染物浓度不符合后续浓度要求,则将不合格泥浆经淋洗污泥出泥管604通入泥浆回流管602中回流至泥浆进管201进行进一步淋洗处理;Further, 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
进一步地,污染土壤与剩余污泥按照干重1:1比例混合;Further, the contaminated soil and the remaining sludge are mixed in a 1: 1 ratio of dry weight;
进一步地,所述土壤修复装置设置有自控系统,所述自控系统包括:设置在泥浆罐、淋洗罐、干湿混合器及污泥脱水干化装置上水分测定仪、温度仪,自控系统连接加药管206上的加药装置;所述泥浆进管601、泥浆回流管602、混合污泥进泥管603、淋洗污泥出泥管604、设置有污泥泵以及脱水干化污泥管 605上设置螺旋出泥设备;所述自控系统包括信号输出控制单元,信号输出控制单元经过数据分析后对污泥泵、加药装置、螺旋出泥设备进行控制,自控系统通过多个测定指标实现对土壤修复装置的自动控制;Further, 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;
进一步地,依据受污染的重金属元素种类,选用不同的淋洗剂种类和浓度:对含有Cd、Cu、Pb或Zn的土壤,采用浓度为0.05mol/L的有机络合剂EDTA来淋洗,然后再添加浓度为0.1-0.3mol/L的柠檬酸淋洗;对含有As的土壤,先加入浓度0.05-0.15mol/L的有机络合剂EDTA淋洗,然后再添加浓度0.20-0.30mol/L的草酸淋洗;对含有汞的土壤,采用浓度0.2mol/L的有机络合剂EDTA、浓度0.15-0.23mol/L的草酸、0.1-0.25mol/LKI溶液三种淋洗剂按顺序淋洗。Further, according to the types of contaminated heavy metal elements, different types and concentrations of leaching agents are selected: 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. Then add 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.
进一步地,所述淋洗罐顶部设置富含有重金属的淋洗液,并进行重金属回收处理;并回收淋洗液通入加药管加药。Further, 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.
由以上方案可见,本发明是一种以土壤淋洗及剩余污泥混合堆肥实现土壤重金属去除并提高土壤有机质含量的装置,可广泛应用于受重金属污染的土壤修复场地。与传统处理工艺相比,具有如下优势:It can be seen from the above solution that 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:
1、以土壤淋洗为核心,结合剩余污泥脱水干化后的剩余污泥,将混合后的泥浆和污泥进行堆肥处理,既可以降低泥浆水分含量,还可以提高土壤有机质含量和土壤肥力;1. Taking soil leaching as the core, combining the remaining sludge after dehydration and drying, 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. ;
2、堆肥处理过程中,可以有效降低混合物的水分、有害微生物活性,大幅度降低了后续泥浆脱水的脱水工艺的功耗,处理效率得到了显著的提高;2. During the composting process, it can effectively reduce the moisture and harmful microbial activity of the mixture, greatly reduce the power consumption of the subsequent mud dehydration dehydration process, and the treatment efficiency has been significantly improved;
3、工艺运行过程中,只需投加淋洗剂这些较为廉价的药剂,运行成本低,经济性好;3. In the process of process operation, only the cheaper chemicals such as leaching agent need to be added, so the running cost is low and the economy is good;
4、EDTA作为化学淋洗剂,在较大的pH值范围内能和土壤中的绝大多数阳离子重金属形成络合物,大大增加重金属的去除率,同时对底泥的理化性质影响较小。EDTA具有低生物可降解性,可以回收并重复利用。当含有多种重金 属时,利用EDTA对Cd、Cu、Pb、Zn的去除,草酸对As、Cd、Cu、Zn的去除,KI对汞的去除来实现对污染底泥各种重金属的修复。4. As a chemical leaching agent, 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.
此外,该装置可以模块化组装,将底座设置在机动车车厢上,可以依据土壤污染状况移动化处理,大大提高了装备机动能力,且不会对周边环境造成二次污染。In addition, 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.
附图说明BRIEF DESCRIPTION
图1为本发明土壤修复装置示意图;1 is a schematic diagram of the soil remediation device of the present invention;
图2为柱状筛网示意图:Figure 2 is a schematic diagram of a cylindrical screen:
1泥浆罐;2淋洗罐;201泥浆进管;202筛网一;203筛网二;204筛网三;205;搅拌装置;206加药管;207出泥管;208柱状筛网驱动装置;209柱状筛网;3干湿混合器;301搅拌器;4污泥脱水干化装置;5底座;601泥浆进管;602泥浆回流管;603混合污泥进泥管;604淋洗污泥出泥管;605脱水干化污泥管。1 Mud tank; 2 rinse tank; 201 mud inlet pipe; 202 screen one; 203 screen two; 204 screen three; 205; mixing device; 206 dosing tube; 207 mud pipe; 208 cylindrical screen drive device 209 column screen; 3 dry and wet mixer; 301 mixer; 4 sludge dehydration and drying device; 5 base; 601 mud inlet pipe; 602 mud return pipe; 603 mixed sludge inlet mud pipe; 604 shower sludge Mud outlet pipe; 605 dewatering and drying sludge pipe.
具体实施方式detailed description
下面通过实施例对本发明做进一步的详细说明,以令本领域技术人员参照说明书文字能够据以实施。The following further describes the present invention in detail through examples, so that those skilled in the art can refer to the text of the description to implement accordingly.
应当理解,本文所使用的诸如“具有”,“包含”以及“包括”术语并不排除一个或多个其它元件或其组合的存在或添加。It should be understood that the terms such as "having", "including", and "including" as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.
实施例1Example 1
参阅图1,本发明包括泥浆罐1、淋洗罐2、干湿混合器3、污泥脱水干化装置4;底座5以及泥浆进管601、泥浆回流管602、污泥双向管603、淋洗污泥出泥管604、污泥脱水干化污泥管605;待处理土壤投加入泥浆罐1中,泥浆制备完成后,通过泥浆进管601进入淋洗罐中进行淋洗,淋洗后的污泥通过淋洗污泥出泥管604排入干湿污泥混合器3;经过污泥脱水干化装置处理后的剩余 污泥经过脱水干化污泥管605进入干湿污泥混合器3与淋洗后的污泥进行混合,混均后的污泥排出;Referring to FIG. 1, 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;
所述淋洗罐内上部设置横置式滤网一202,设置在淋洗罐顶部的泥浆进管201将泥浆通入淋洗罐时,滤网一对其进行初步过滤,在滤网一的下方设置有柱状筛网209,所述柱状筛网顶部开口,所述开口为上大下小的喇叭状,用于承接经滤网一过滤的泥浆,所述柱状筛网中由上至下设置若干横置筛网,对泥浆进行逐层过滤,实现泥浆颗粒分级淋洗,所述淋洗罐上部设置搅拌装置205,所述搅拌装置的桨叶设置在柱状筛网内部;所述淋洗罐底部设置柱状筛网驱动装置208用于驱动柱状筛网的转动;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;
所述淋洗罐顶盖与滤网一之间设置加药管206,所述柱状筛网中设置的若干横置筛网对应设置若干出泥管207,用于分级排出经过淋洗的泥浆进入淋洗污泥出泥管604中;所述出泥管207上设置检测装置,用于检测污泥中污染物浓度;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;
所述若干横置筛网包括筛网二203、筛网三204;所述筛网一孔径为20mm;所述筛网二孔径为10mm、所述筛网三孔径为2mm,所述柱状筛网孔径0.5mm;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;
所述检测装置检测后的污染物浓度满足后续处理工序,经过淋洗污泥出泥管604将合格泥浆经混合污泥进泥管603通入干湿混合器3中,在合格泥浆进入干湿混合器3的同时,将经过污泥脱水干化装置处理后的剩余污泥经过脱水干化污泥管605通入干湿混合器3中,实现合格泥浆和剩余污泥的混合。所述干湿混合器中设置搅拌器301,所述搅拌器301设置多个搅拌桨叶;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;
所述淋洗罐内设置的横置筛网的孔径由上至下逐步变小,所述淋洗罐底部为锥形底,且锥形底设置出泥管连通淋洗污泥出泥管604,所述锥形底设置的出泥管上设置检测装置;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;
所述检测装置检测污泥中污染物浓度不符合后续浓度要求,则将不合格泥浆经淋洗污泥出泥管604通入泥浆回流管602中回流至泥浆进管201进行进一步淋洗处理。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.
污染土壤与剩余污泥按照干重1:1比例混合。The contaminated soil and remaining sludge are mixed in a 1: 1 ratio of dry weight.
将含有六价铬(0.24-0.35g/kg)、铅(0.48-0.53g/kg)的重金属污染土壤采用上述土壤修复装置处理,经过1h淋洗后并混合剩余污泥堆肥处理后,处理后的土壤中六价铬的去除率达到86.5%,铅的去除率84.4%。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%.
实施例2Example 2
具体实施方式与实施例1相同,区别在于土壤受到镉(0.08-0.15g/kg)污染,采用浓度0.2mol/L的有机络合剂EDTA、浓度0.15-0.23mol/L的草酸、0.1-0.25mol/LKI溶液三种淋洗剂按顺序淋洗处理,与剩余污泥混合堆肥后,土壤中汞离子浓度降低86.8%。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%.
以上实施例的说明只是用于帮助理解本发明的方法及其核心思想。应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以对本发明进行若干改进和修饰,这些改进和修饰也落入本发明权利要求的保护范围内。The descriptions of the above embodiments are only used to help understand the method of the present invention and its core idea. It should be noted that, for those of ordinary skill in the art, without departing from the principles of the present invention, the present invention may also be subject to several improvements and modifications, and these improvements and modifications also fall within the protection scope of the claims of the present invention.
对所公开的实施例的上述说明,使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的,本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下,在其它实施例中实现。因此,本发明将不会被限制于本文所示的这些实施例,而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

  1. 一种受重金属污染土壤的土壤修复装置,其特征在于:包括泥浆罐、淋洗罐、干湿混合器、污泥脱水干化装置;底座以及泥浆进管、泥浆回流管、污泥双向管、淋洗污泥出泥管、污泥脱水干化污泥管;A soil remediation device for soil contaminated by heavy metals, characterized in that it includes a mud tank, a leaching tank, a wet and dry mixer, a sludge dehydration and drying device; a base and a mud inlet pipe, a mud return pipe, a sludge bidirectional pipe, Sludge sludge discharge pipe, sludge dewatering and drying sludge pipe;
    待处理土壤投加入泥浆罐中,泥浆制备完成后,通过泥浆进管进入淋洗罐中进行淋洗,淋洗后的污泥通过淋洗污泥出泥管排入干湿污泥混合器;The soil to be treated is added to the mud tank. After the mud preparation is completed, it enters the leaching tank through the mud inlet pipe for leaching, and the leached sludge is discharged into the wet and dry sludge mixer through the leaching sludge outlet pipe;
    经过污泥脱水干化装置处理后的剩余污泥经过脱水干化污泥管进入干湿污泥混合器与淋洗后的污泥进行混合,混均后的污泥排出。The remaining sludge processed by the sludge dewatering and drying device enters the wet and dry sludge mixer through the dewatering and drying sludge pipe and is mixed with the washed sludge, and the mixed sludge is discharged.
  2. 根据权利要求1所述的装置,其特征在于:所述淋洗罐内上部设置横置式滤网一,设置在淋洗罐顶部的泥浆进管将泥浆通入淋洗罐时,滤网一对其进行初步过滤,在滤网一的下方设置有柱状筛网,所述柱状筛网顶部开口,所述开口为上大下小的喇叭状,用于承接经滤网一过滤的泥浆,所述柱状筛网中由上至下设置若干横置筛网,对泥浆进行逐层过滤,实现泥浆颗粒分级淋洗,所述淋洗罐上部设置搅拌装置,所述搅拌装置的桨叶设置在柱状筛网内部;所述淋洗罐底部设置柱状筛网驱动装置用于驱动柱状筛网的转动。The device according to claim 1, characterized in that: a horizontal filter 1 is provided in the upper part of the leaching tank, and a pair of sieve screens are provided when the mud inlet pipe at the top of the leaching tank passes the mud into the leaching tank It performs preliminary filtration, and a cylindrical screen is provided below the first screen, the top of the cylindrical screen is open, and the opening is a trumpet with a large size and a small size, used to receive the filtered mud through the screen 1, the A plurality of horizontal screens are arranged from top to bottom in the cylindrical screen, and the mud is filtered layer by layer to realize graded leaching of the mud particles. A stirring device is provided on the upper part of the leaching tank, and the paddles of the stirring device are provided on the cylindrical screen Inside the net; a cylindrical screen drive device is provided at the bottom of the washing tank for driving the rotation of the cylindrical screen.
  3. 根据权利要求1所述的装置,其特征在于:所述淋洗罐顶盖与滤网一之间设置加药管,所述柱状筛网中设置的若干横置筛网对应设置若干出泥管,用于分级排出经过淋洗的泥浆进入淋洗污泥出泥管中;所述出泥管上设置检测装置,用于检测污泥中污染物浓度。The device according to claim 1, characterized in that: a medicine adding pipe is provided between the top cover of the rinsing tank and the screen one, and a plurality of horizontal screens provided in the cylindrical screen are correspondingly provided with a number of mud outlet pipes , Used for grading and discharging the washed mud into the sludge discharge pipe; the mud discharge pipe is provided with a detection device for detecting the concentration of pollutants in the sludge.
  4. 根据权利要求2所述的装置,其特征在于:所述若干横置筛网包括筛网二、筛网三。The device according to claim 2, wherein the plurality of horizontal screens include screen two and screen three.
  5. 根据权利要求1所述的装置,其特征在于:所述检测装置检测后的污染物浓度满足后续处理工序,经过淋洗污泥出泥管将合格泥浆经混合污泥进泥管通入干湿混合器中,在合格泥浆进入干湿混合器的同时,将经过污泥脱水干化装置处理后的剩余污泥经过脱水干化污泥管通入干湿混合器中,实现合格泥浆 和剩余污泥的混合,所述干湿混合器中设置搅拌器,所述搅拌器设置多个搅拌桨叶。The device according to claim 1, characterized in that the concentration of the pollutants detected by the detection device satisfies the subsequent processing steps, and the qualified mud is passed through the mixed sludge into the mud pipe through the leaching sludge discharge pipe into the wet and dry pipe In the mixer, while the qualified mud enters the dry and wet mixer, the remaining sludge processed by the sludge dehydration and drying device is passed through the dehydration and drying sludge pipe into the dry and wet mixer to achieve the qualified mud and residual sewage For the mixing of mud, a stirrer is provided in the dry and wet mixer, and the stirrer is provided with a plurality of stirring blades.
  6. 根据权利要求1所述的装置,其特征在于:所述淋洗罐内设置的横置筛网的孔径由上至下逐步变小,所述淋洗罐底部为锥形底,且锥形底设置出泥管连通淋洗污泥出泥管,所述锥形底设置的出泥管上设置检测装置。The device according to claim 1, characterized in that: the aperture of the horizontal screen provided in the rinsing tank gradually decreases from top to bottom, the bottom of the rinsing tank is a tapered bottom, and the tapered bottom A sludge discharge pipe is provided to communicate with the sludge sludge discharge pipe, and a detection device is provided on the sludge discharge pipe provided on the conical bottom.
  7. 根据权利要求1所述的装置,其特征在于:所述检测装置检测污泥中污染物浓度不符合后续浓度要求,则将不合格泥浆经淋洗污泥出泥管通入泥浆回流管中回流至泥浆进管进行进一步淋洗处理。The device according to claim 1, characterized in that 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 discharge pipe to the mud return pipe to return To the mud inlet pipe for further leaching treatment.
  8. 根据权利要求1所述的装置,其特征在于:所述土壤修复装置设置有自控系统,所述自控系统包括:设置在泥浆罐、淋洗罐、干湿混合器及污泥脱水干化装置上水分测定仪、温度仪,自控系统连接加药管上的加药装置;所述泥浆进管、泥浆回流管、混合污泥进泥管、淋洗污泥出泥管、设置有污泥泵以及脱水干化污泥管上设置螺旋出泥设备;所述自控系统包括信号输出控制单元,信号输出控制单元经过数据分析后对污泥泵、加药装置、螺旋出泥设备进行控制,自控系统通过多个测定指标实现对土壤修复装置的自动控制。The device according to claim 1, characterized in that: the soil remediation device is provided with an automatic control system, and the automatic control system comprises: a mud tank, a leaching tank, a wet-dry mixer and a sludge dehydration and drying device Moisture meter, temperature meter, automatic control system connected to the dosing device on the dosing pipe; the mud inlet pipe, mud return pipe, mixed sludge inlet mud pipe, washing sludge outlet pipe, equipped with sludge pump and Screw dewatering equipment is installed on the dewatering and drying sludge pipe; the automatic control system includes a signal output control unit. After data analysis, the signal output control unit controls the sludge pump, dosing device and screw dewatering equipment, and the automatic control system passes Multiple measurement indicators realize automatic control of the soil remediation device.
  9. 根据权利要求4所述的装置,其特征在于:所述筛网一孔径为10-20mm;所述筛网二孔径为2mm-10mm、所述筛网三孔径为0.5mm-2mm,所述柱状筛网孔径小于0.5mm。The device according to claim 4, characterized in that the first aperture of the screen is 10-20mm; the second aperture of the screen is 2mm-10mm, the third aperture of the screen is 0.5mm-2mm, and the columnar shape The screen aperture is less than 0.5mm.
  10. 根据权利要求1所述的装置,其特征在于:依据受污染的重金属元素种类,选用不同的淋洗剂种类和浓度:对含有Cd、Cu、Pb或Zn的土壤,采用浓度为0.05mol/L的有机络合剂EDTA来淋洗,然后再添加浓度为0.1-0.3mol/L的柠檬酸淋洗;对含有As的土壤,先加入浓度0.05-0.15mol/L的有机络合剂EDTA淋洗,然后再添加浓度0.20-0.30mol/L的草酸淋洗;对含有汞的土壤,采用浓度0.2mol/L的有机络合剂EDTA、浓度0.15-0.23mol/L的草酸、0.1-0.25mol/LKI溶液三种淋洗剂按顺序淋洗。The device according to claim 1, characterized in that different types and concentrations of leaching agents are selected according to the types of contaminated heavy metal elements: for soils containing Cd, Cu, Pb or Zn, the concentration is 0.05 mol / L The organic complexing agent EDTA is used for rinsing, and then citric acid with a concentration of 0.1-0.3mol / L is added for rinsing; for the soil containing As, the organic complexing agent EDTA with a concentration of 0.05-0.15mol / L is first added for rinsing , And then add oxalic acid with a concentration of 0.20-0.30mol / L to rinse; for the soil containing mercury, use the organic complexing agent EDTA with a concentration of 0.2mol / L, oxalic acid with a concentration of 0.15-0.23mol / L, 0.1-0.25mol / The three rinse agents of LKI solution are rinsed in sequence.
PCT/CN2019/078641 2018-10-08 2019-03-19 Soil remediation device for heavy metal-contaminated soil WO2020073609A1 (en)

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CN110116131A (en) * 2019-06-18 2019-08-13 长沙如洋环保科技有限公司 A kind of heavy metal-polluted soil prosthetic device
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