CN214184572U - Soil dystopy washs repair system - Google Patents
Soil dystopy washs repair system Download PDFInfo
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- CN214184572U CN214184572U CN202022469513.0U CN202022469513U CN214184572U CN 214184572 U CN214184572 U CN 214184572U CN 202022469513 U CN202022469513 U CN 202022469513U CN 214184572 U CN214184572 U CN 214184572U
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Abstract
The utility model provides a soil dystopy washs repair system, including pretreatment unit and elementary screening unit, soil through pretreatment gets into elementary screening unit, soil after elementary screening unit is hierarchical gets into respectively builds heap drip washing unit and secondary screening unit, the low reaches of building heap drip washing unit are provided with water treatment unit, soil after secondary screening unit is hierarchical gets into cleaning unit and cement kiln synergistic processing unit respectively, soil after cleaning unit handles gets into water treatment unit, the supernatant after water treatment flows back to building heap drip washing unit and cleaning unit, the sediment after water treatment gets into cement kiln synergistic processing unit. This soil dystopy washs repair system adopts three group technology complex to restore contaminated soil, has greatly reduced the water consumption, and the technology arranges simple and easy operation, no secondary pollution, and the soil after the restoration can directly use, but wide application is administered in the soil restoration of organic matter, heavy metal and its complex pollution plots.
Description
Technical Field
The utility model belongs to the technical field of pollute soil restoration, especially, relate to a soil dystopy washs repair system.
Background
Generally, soil remediation technologies are mainly classified into in-situ remediation and ex-situ remediation. The soil in-situ remediation technology does not need to excavate and transport soil, has low remediation cost, but is difficult to predict the removal effect and the continuous remediation time when facing groundwater pollution, and the removal effect is challenged by site geological conditions and the like, so the in-situ remediation technology is generally applied to polluted sites with large polluted area, deeper pollutant migration and lower pollution concentration; the ectopic soil leaching remediation technology has the characteristics of no secondary pollution, simple structure, short remediation period, high efficiency, good effect and the like, but the ectopic remediation technology has relatively high engineering cost, so that the ectopic soil leaching remediation technology is commonly used for polluted sites which have higher development value and are urgently developed and utilized.
Currently, large pollution sites in China have wide distribution range and relate to more industries; the occupied area is large, and the pollution condition is complex; the pollution of various pollutants and serious pollution, and the like, which results in single type of the polluted soil remediation technology applied in domestic engineering. In the treatment process of a large polluted site, the thermal desorption technology is widely applied, the application frequency is the highest and accounts for 37%, and the energy-intensive repair technology such as thermal desorption and cement kiln cooperative treatment accounts for 54%. The process has relatively high energy consumption, tail gas generated in the incineration process needs to be further treated, and the secondary pollution prevention and control difficulty is high; and part of large thermal desorption equipment still depends on imports, so that the equipment cost is high and the like.
The soil cleaning technology is to adopt physical separation or synergistic elution and other measures, separate heavy metal contaminated soil components or transfer pollutants from soil phase to liquid phase by adding water or proper synergistic agents, effectively reduce the treatment amount of contaminated soil and realize reduction. The wastewater of the elution system is recycled or discharged after reaching the standard after being treated to remove pollutants. The technology is widely applied abroad, and in the existing research progress about soil cleaning technology in China, the invention provides a soil repairing device based on ectopic cleaning and a repairing method thereof, and provides a method for effectively separating precipitates from clear cleaning waste liquid; guo shuhai and the like propose a cleaning method and an experimental device for water-soluble exchange-state heavy metal contaminated soil, and the method adopts an integrated process of cleaning, filtering and ion exchange recovery, and has the advantages of secondary pollution avoidance, simple structure, low energy consumption and the like; qin Feng forest, etc. discloses a leaching and repairing device for heavy metal chromium-polluted soil, etc. Many research reports about soil cleaning repair devices exist, however, bottlenecks such as large water requirement, complex degradation of cleaned wastewater and the like are faced when the production capacity of a single set of equipment is 30-50 t/h, and therefore the economic applicability and the engineering repair application of the soil cleaning technology in China are less.
Disclosure of Invention
In view of this, the utility model aims at overcoming the defect that exists among the above-mentioned prior art, provide a soil dystopy washing repair system that is used for organic matter, heavy metal combined pollution soil to restore and administers, this system is efficient, the cycle is short, and with low costs, no secondary pollution.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
a soil ex-situ cleaning and repairing system comprises a pretreatment unit, a primary screening unit, a pile-building leaching unit, a secondary screening unit, a water treatment unit, a cleaning unit and a cement kiln cooperative treatment unit;
big particle diameter soil after elementary screening unit is hierarchical gets into and builds a heap drip washing unit, and little particle diameter soil gets into secondary screening unit, it is provided with the water treatment unit to build the low reaches of heap drip washing unit, warp big particle diameter soil after secondary screening unit is hierarchical gets into the cleaning unit, and little particle diameter soil gets into cement kiln coprocessing unit, warp soil after the cleaning unit handles gets into the water treatment unit, and the supernatant after water treatment flows back to building heap drip washing unit and cleaning unit, and the bed mud after water treatment gets into cement kiln coprocessing unit.
Furthermore, the pretreatment unit comprises a screening bin and a pulverizer which are arranged in sequence, and the soil crushed by the pulverizer enters the primary screening unit.
Further, the primary screening unit comprises a primary vibrating screen, which is a 10-mesh vibrating screen.
Furthermore, build the heap leaching unit and include domatic and enclose the water-proof weir of locating on domatic, the top of water-proof weir is equipped with spray set, the minimum end department of water-proof weir is equipped with catchment ditch, water input water processing unit in the catchment ditch.
Further, the water treatment unit comprises a liquid collecting tank, a flocculation tank, a PH adjusting tank and a secondary sedimentation tank which are sequentially arranged, and a detoxification unit is arranged between the liquid collecting tank and the flocculation tank.
Furthermore, the detoxification unit comprises a contact oxidation reactor and an ultraviolet reactor, wastewater in the liquid collecting tank enters the contact oxidation reactor from the bottom of the contact oxidation reactor, ozone is introduced into an input pipe of the contact oxidation reactor, and then the wastewater overflows from the upper part of the contact oxidation reactor and enters the ultraviolet reactor.
Further, the secondary screening unit comprises an advanced vibrating screen, which is a 100 mesh vibrating screen.
Furthermore, the cleaning unit comprises an aeration tank or a cleaning tank, one end of the aeration tank or the cleaning tank is communicated with the secondary screening unit and is used for receiving a small part of polluted soil which is difficult to repair by the pile-up leaching unit, and the cleaned slurry enters the water treatment unit.
Further, the cement kiln co-processing unit comprises a mixing and stirring unit and a pre-homogenizing unit which are arranged in sequence.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) this soil dystopy washs repair system adopts three group technology complex to restore contaminated soil, builds the heap leaching promptly + washs and cement kiln cooperation integrated repair technique more meticulously. The whole process is mainly carried out by piling and leaching, the process arrangement is simple and convenient, the operation is easy, and no secondary pollution is caused; and the repaired soil can be directly used.
(2) The soil ex-situ cleaning and repairing system adopts optimized graded decrement, solves the problem of large water requirement for cleaning, greatly reduces the earthwork amount treated by the cement kiln cooperation technology, reduces energy consumption and environmental footprint, and improves the energy utilization efficiency; and the flocculation precipitation is adopted for mud-water separation, so that the equipment and energy consumption are further reduced.
(3) This soil dystopy washs repair system carries out cement kiln coprocessing with the tiny particle after the screening, has reduced the burning energy consumption of cement kiln, and is difficult for producing ash content and residue, reduces the secondary treatment cost.
(4) This soil dystopy washs repair system further improves treatment efficiency, shortens repair cycle by a wide margin, reduces environmental impact, but wide application in the soil restoration of organic matter, heavy metal and combined pollution piece is administered.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
fig. 1 is the utility model discloses a soil dystopy washs repair system overall structure sketch map.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention will be described in detail with reference to the following examples with reference to the accompanying drawings:
as shown in fig. 1, the soil ex-situ cleaning and restoring system comprises a pretreatment unit, a primary screening unit, a pile-building leaching unit, a secondary screening unit, a water treatment unit, a cleaning unit and a cement kiln co-treatment unit;
the treatment capacity of the polluted soil of the system is about 5000m3After the soil is subjected to layered dredging and transportation to a treatment site, the soil enters a pretreatment unit, the pretreated soil enters a primary screening unit, the large-particle-size soil classified by the primary screening unit enters a pile-building leaching unit, the small-particle-size soil enters a secondary screening unit, a water treatment unit is arranged at the downstream of the pile-building leaching unit, the large-particle-size soil classified by the secondary screening unit enters a cleaning unit, the small-particle-size soil enters a cement kiln synergistic treatment unit, the soil treated by the cleaning unit enters the water treatment unit, supernatant subjected to water treatment flows back to the pile-building leaching unit and the cleaning unit, and bottom sludge subjected to water treatment enters a cement kiln synergistic treatment unit;
in the system, screening pretreatment is a key link, and researches show that: the mass concentration of heavy metal lead adsorbed by soil particles is gradually increased along with the reduction of the particle size, the heavy metal concentration of the soil particles with different particle size grades is easy to exceed the screening value, and the 10-mesh sieve and the 100-mesh sieve are selected as the average division values of coarse particles and fine particles obtained through statistics in the application;
s1, preprocessing unit: the pretreatment unit comprises a screening bin and a crusher which are sequentially arranged, sundries such as grass roots, stones and the like in the soil are removed through the screening bin with grid strips, meanwhile, different substances in the soil are screened, the soil is properly crushed, the materials are uniform, the safe and stable operation of subsequent treatment equipment is guaranteed, and the soil crushed by the crusher enters the primary screening unit;
s2, primary screening unit: the primary screening unit comprises a primary vibrating screen which is a vibrating screen with 10 meshes and is used for coarsely screening the polluted soil, after the pretreated soil enters the primary vibrating screen, the polluted soil with the particle size of more than 2.00mm enters the stacking and leaching unit for repairing and treating, the polluted soil is repaired, the repaired soil is used for safe storage after being accepted and qualified, and the polluted soil with the particle size of less than 2.00mm is classified by the secondary screening unit;
s3, building a pile and leaching unit: the pile-building leaching unit comprises a slope surface and a waterproof weir arranged on the slope surface in a surrounding manner, a spraying device is arranged above the waterproof weir, a catchment ditch is arranged at the lowest end of the waterproof weir, and water in the catchment ditch is input into the water treatment unit;
in the pile-building leaching treatment unit, an eluent is 0.1-0.4 mol/L, pH ═ 3 disodium ethylene diamine tetraacetic acid (EDTA-2Na) solution and a supernatant circulating solution after water treatment, the liquid-soil ratio is controlled to be 5:1, the eluent is sprayed on the pile soil through a spraying system, the binding force between soil particles and pollutants is reduced by the action of the eluent, the pollutants and the soil particles enter an eluent water phase after being separated, the leached cyanide-containing wastewater enters a liquid collecting tank, and the wastewater flow is 90L/h;
s4, a water treatment unit: the water treatment unit is equipped with the unit that detoxifies including the collecting tank, flocculation basin, PH equalizing basin and the secondary sedimentation pond that set gradually between collecting tank and the flocculation basin:
the detoxification unit comprises a contact oxidation reactor and an ultraviolet reactor, wherein wastewater in a liquid collecting tank enters the contact oxidation reactor from the bottom of the contact oxidation reactor, ozone is introduced into an input pipe of the contact oxidation reactor through a venturi tube, the ozone and leaching wastewater are mixed and enter the contact oxidation reactor for primary degradation reaction, and then the wastewater overflows from the upper part of the contact oxidation reactor and enters the ultraviolet reactor for deep detoxification treatment;
after the detoxification process treatment, the cyanide-containing wastewater after treatment enters a flocculation tank, and Na is added into the flocculation tank2S+Ca(OH)2Medicine using Ca2+Competitive adsorption of ions and target heavy metal to EDTA (ethylene diamine tetraacetic acid) enables the chelate to release the target heavy metal, and then the chelate passes through S2-、HS-Competitive adsorption of ions and EDTA on target heavy metals, and finally separation in the form of heavy metal sulfide precipitation through flocculation and sedimentation;
adding a green flocculating agent for flocculation, enabling the wastewater to enter a pH adjusting tank, manually adding alkali liquor to keep the pH of a water body at 10.5, enabling the wastewater to enter a secondary sedimentation tank, standing and precipitating by gravity, performing solid-liquid separation on slurry, adjusting the pH of upper-layer clear eluent, performing dosage treatment, and then entering a circulating elution system for recycling of a pile-building elution unit and a cleaning unit, performing safe storage if a filter-pressed mud cake reaches the standard, and cleaning and transporting the polluted soil if the mud cake does not reach the standard, sending the polluted soil to a cement plant, and entering a cement kiln cooperative treatment unit;
storing the polluted soil in a polluted soil storage workshop of a cement plant, then carrying out crushing, screening, pre-homogenizing and other treatments on the polluted soil entering the plant, and then conveying the polluted soil to a specific feeding point (generally a material preparation link, a preheating decomposition link or a clinker firing link) of a cement kiln according to a certain proportion, so as to realize the cooperative treatment of the polluted soil in the high-temperature firing process of cement;
s5, secondary screening unit: the secondary screening unit comprises a high-grade vibrating screen which is a 100-mesh vibrating screen, the polluted soil with the particle size of 0.150-2.00 mm enters the cleaning unit, and the polluted soil with the particle size of less than 0.150mm is conveyed to the cement kiln cooperative processing unit for processing treatment;
s6: a cleaning unit: the cleaning device used by the cleaning unit can be an aeration tank or a cleaning tank, supernatant separated by a secondary sedimentation tank is injected into the cleaning device, aeration and stirring equipment are arranged in the cleaning device, one end of the cleaning device is communicated with the upper layer of a high-grade vibrating screen, meanwhile, a small part of polluted soil which is difficult to repair by the pile-building leaching unit is received, EDTA-2Na solution with the concentration of 0.1-0.4 mol/L, pH being 3 is added, the mixed solution is mixed according to the liquid-soil ratio of 10:1, the mixed solution is sufficiently rubbed and washed under the action of the stirring equipment, the washing time is 120min, deep stirring and cleaning are carried out, upper-layer clear leacheate enters a circulating leaching system for recycling, and filter-pressed mud enters a liquid collecting tank;
s7: the cement kiln co-processing unit: including the mixed stirring unit and the prehomogenization unit that set gradually, the mixed stirring unit carries out cement kiln with the remaining substandard contaminated soil that is difficult to degrade of upper portion and deals with in coordination, it screens through grading to be about to pollute soil, after the washing, remaining a small amount of heavily polluted soil that is difficult to wash, and the very little great contaminated soil of the minimum viscosity of particle size sends to the cement factory, the contaminated soil that will enter the factory carries out the breakage, preliminary treatment such as screening and prehomogenization, then carry to the specific charging point of cement kiln according to certain proportion, fire cement in the high temperature furnace of cement, realize the cooperation of contaminated soil and deal with.
Pollutant such as organic matter is gathered more easily to the tiny particle, before not grading, pollute soil generally including miscellaneous fill, sand grain, the soil particle of different properties such as silt, directly carry out cement kiln coprocessing with soil, the energy consumption that the cement kiln burns has been increased, and easily produce more ash contents and residue, need intensive dust removal, and do further processing to the residue, and get the tiny particle after the grading and gathered most organic matters, be more favorable to the firing of cement kiln, the energy consumption reduces, and direct one step targets in place to the processing of pollutant, no secondary pollution.
The repair method comprises the following steps: the total Pb content in the soil samples repaired in three circulating batches is less than or equal to 300 mg/kg, and reaches the secondary standard (pH 6.5-7.5) of soil environmental quality standard (GB 15618-;
although the total Cd content is still different from the standard value of 0.3mg/kg, the total Cd content is still between 1 and 22mg/kg according to the existing evaluation standard of soil environmental quality for exhibition lands (HJ 350-2007), still meets the soil B-level standard but exceeds the A-level standard, and can be suitable for II-type land utilization types such as venue lands, greening lands, commercial lands, public municipal lands and the like;
measuring the pH value of the soil to be 8.43 after the leaching is finished; the average cyanide content in the treated soil is 5.6mg/kg, and reaches the limit value of less than 9.86mg/kg of the residential land standard of the national construction land soil pollution risk screening guidance value; the leaching toxicity of soil cyanide is 0.017mg/L, which reaches the national ground water quality standard (GB14848-93) IV class and is less than the limit value of 0.1 mg/L; the average cyanide content in the finally treated wastewater sample is 0.05mg/L, the requirement that the national comprehensive wastewater discharge standard (GB8978-1996) is less than 0.5mg/L is met, and the technical indexes of the technical scheme reach the domestic advanced level;
the content of organic matters such as benzo (a) pyrene, dibenzo (a, h) anthracene, benzo (b) fluoranthene and the like in the soil is obviously reduced and reaches below the national standard value.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A soil ex-situ cleaning and repairing system is characterized by comprising a pretreatment unit, a primary screening unit, a pile-building leaching unit, a secondary screening unit, a water treatment unit, a cleaning unit and a cement kiln cooperative treatment unit;
the soil through preliminary treatment gets into elementary screening unit, and the large particle diameter soil after elementary screening unit is hierarchical gets into and builds a heap drip washing unit, and small particle diameter soil gets into secondary screening unit, it is provided with the water treatment unit to build the low reaches of heap drip washing unit, warp the large particle diameter soil after secondary screening unit is hierarchical gets into the cleaning unit, and small particle diameter soil gets into cement kiln coprocessing unit, warp soil after the cleaning unit handles gets into the water treatment unit, and the supernatant after water treatment flows back to piling drip washing unit and cleaning unit, and the sediment after water treatment gets into cement kiln coprocessing unit.
2. A soil ex-situ cleaning remediation system according to claim 1, wherein: the pretreatment unit comprises a screening bin and a pulverizer which are arranged in sequence, and soil crushed by the pulverizer enters the primary screening unit.
3. A soil ex-situ cleaning remediation system according to claim 1, wherein: the primary screening unit comprises a primary vibrating screen which is a 10-mesh vibrating screen.
4. A soil ex-situ cleaning remediation system according to claim 1, wherein: the pile-building leaching unit comprises a slope surface and a waterproof weir enclosed on the slope surface, a spraying device is arranged above the waterproof weir, a catchment ditch is arranged at the lowest end of the waterproof weir, and water in the catchment ditch is input into the water treatment unit.
5. A soil ex-situ cleaning remediation system according to claim 1, wherein: the water treatment unit comprises a liquid collecting tank, a flocculation tank, a PH adjusting tank and a secondary sedimentation tank which are arranged in sequence, and a detoxification unit is arranged between the liquid collecting tank and the flocculation tank.
6. A soil ex-situ cleaning remediation system according to claim 5, wherein: the detoxification unit comprises a contact oxidation reactor and an ultraviolet reactor, wastewater in the liquid collecting tank enters the contact oxidation reactor from the bottom of the contact oxidation reactor, ozone is introduced into an input pipe of the contact oxidation reactor, and then the wastewater overflows from the upper part of the contact oxidation reactor and enters the ultraviolet reactor.
7. A soil ex-situ cleaning remediation system according to claim 1, wherein: the secondary screening unit comprises an advanced vibrating screen, which is a 100-mesh vibrating screen.
8. A soil ex-situ cleaning remediation system according to claim 1, wherein: the cleaning unit comprises an aeration tank or a cleaning tank, one end of the aeration tank or the cleaning tank is communicated with the secondary screening unit and is used for receiving a small part of polluted soil which is difficult to repair by the pile-building leaching unit, and the cleaned slurry enters the water treatment unit.
9. A soil ex-situ cleaning remediation system according to claim 1, wherein: the cement kiln co-processing unit comprises a mixing and stirring unit and a pre-homogenizing unit which are sequentially arranged.
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| CN202022469513.0U CN214184572U (en) | 2020-10-30 | 2020-10-30 | Soil dystopy washs repair system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115846397A (en) * | 2022-12-30 | 2023-03-28 | 中铁环境科技工程有限公司 | Mine soil remediation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115846397A (en) * | 2022-12-30 | 2023-03-28 | 中铁环境科技工程有限公司 | Mine soil remediation method |
| CN115846397B (en) * | 2022-12-30 | 2023-09-08 | 中铁环境科技工程有限公司 | Mine soil restoration method |
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