CN104475441A - Soil washing restoration system based on reduction concentration design concept and method thereof - Google Patents
Soil washing restoration system based on reduction concentration design concept and method thereof Download PDFInfo
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Abstract
The invention discloses a soil washing restoration system based on a reduction concentration design concept and a method thereof. The washing restoration system comprises the following four module units which are sequentially connected with one another: a feeding and screening unit, an ore washing unit, a sludge dewatering unit and a tail-end sewage treatment recycling unit. The pollutants on the surface of coarse particles are eluted, transferred and concentrated into the filter-pressed mud cake by virtue of washing, so that pollutant-containing fine particles in contaminated soil can be effectively separated from crude particles such as gravel and grit. The repaired and discharged clean gravel and grit can be directly recycled to serve as building material. According to the system, purified water serves as a washing solution, so that secondary pollution caused by addition of a chemical washing agent is avoided, and the washing solution is treated by a tail-end sewage treatment system so as to be recycled. The reduction of remediation of contaminated soil is realized, the comprehensive repair cost is greatly reduced, the washed and discharged materials can be recycled, the contaminated soil is repaired, and a novel profit point is created.
Description
Technical field
The present invention relates to soil restoring technology, especially for the drip washing reparation of coarse granule content compared with high pollution soil, be specifically related to a kind of the Soil leaching repair system and the method thereof that concentrate design concept based on decrement.
Background technology
The national Soil Pollution Investigation publication of issue is combined according to Chinese Ministry of Environmental Protection and Ministry of Land and Resources, China's contaminated soil area is up to 16%, and along with the continuous quickening of China's industrialization, urbanization process and the degree of depth adjustment of the industrial structure, China's soil and groundwater pollution problem will become and become increasingly conspicuous.Especially the city a large amount of retired industrial sites that " moves back two and enter three ", produce in " Tui Chengjin garden " process.These places are valuable position in city often, along with the propelling of urbanization process, becomes commercial land in the future.But most of retired industrial sites all exists heavier soil and underground water pollution, for eliminating the environmental risk of these contaminated sites and healthy threat, need to repair contaminated soil.
The research of contaminated soil remediation technique and equipment was started in for 20 century 70 later stages, the states such as the U.S., Holland, Britain, Japan in the starting of contaminated soil remediation research field comparatively early, peripheral doses, chemical redemption and biological prosthetic in all obtain remarkable break-throughs, form comparatively ripe technical system at present, and have more through engineering approaches success application case.Soil leaching because of its rapidly and efficiently, the large and feature such as with low cost for the treatment of capacity and receive an acclaim abroad and be widely adopted, become one of soil remediation method of twentieth century end Environmental Protection Agency recommendation.Original position drip washing and dystopy drip washing can be divided into according to processing mode difference.Original position elution method directly eluent is injected soil, in downstream, leacheate extracted soil surface, then process leacheate, so continue to carry out, until soil environment quality reaches relevant criterion.Dystopy drip washing is excavated by contaminated soil, drops in drip washing equipment, and employing leacheate cleans the pollutant removed or in the concentrated soil of transfer, finally processes the concentrated mud cake after the leacheate containing pollutant or decrement.This technology can be used for the repairing and treating of the persistency organic contaminant soil such as heavy-metal contaminated soil and polycyclic aromatic hydrocarbon, Polychlorinated biphenyls, organo-chlorine pesticide.
But domestic project soil remediation is started late, the case seeing report the earliest starts from 2007.At present, domestic application relative maturity and general soil restoring technology comprise obstruct landfill, solidification and stabilization, normal temperature desorb, cement kiln burning, redox etc.So far, domesticly there is no Soil leaching through engineering approaches application success case, the Soil leaching technology developed and equipment are also mostly for laboratory lab scale or pilot scale research.
Prior art the pollutant in soil is all cleaned remove, and Soil leaching repair system of the present invention is that the pollutant transfer in soil is concentrated in mud.Mud cake is quick drip washing repair system, and material is extremely short in the intrasystem time of staying, can significantly improve system production capacity and remediation efficiency.Be leacheate with pure water, avoid the secondary pollution caused because of the interpolation of chemical leaching; And leacheate can realize circulating and recovering, without wastewater disposition in whole system running after tail end sewage disposal system is disposed.
Soil leaching repair system of the present invention is not owing to needing the reaction of chemical leaching, and therefore the time of staying is shorter, and the clean gravel of discharging after repairing fast and gravel can be used as building materials and carries out resource, while repairing polluted soil, create new profit point.
Summary of the invention
For alleviating the not enough present situation in domestic existing soil restoring technology and equipment, advancing Soil leaching through engineering approaches application at home, the invention provides a kind of Soil leaching repair system based on " decrement concentrates " design concept and method thereof.
The present invention adopts following technical scheme:
The Soil leaching repair system concentrating design concept based on decrement of the present invention comprises the four module unit be connected in turn: feeder screen subdivision, ore deposit wash the waste water treating and reutilizing unit of unit, sludge dewatering unit and tail end; Described feeder screen subdivision comprises the feed bin, electric magnetic iron remover and the three grades of Wet method vibration screens that are connected in turn; Described ore deposit is washed unit and is comprised: roller-type stone washing machine, screw sand washer, the first mud scratch pool, high frequency shale shaker and the second mud scratch pool, roller-type stone washing machine is connected with three grades of Wet method vibration screens respectively with the front end of screw sand washer, roller-type stone washing machine is connected with the first mud scratch pool respectively with the rear end of screw sand washer, and the first mud scratch pool, high frequency shale shaker and the second mud scratch pool are connected in turn; Described sludge dewatering unit comprises the pneumatic diaphragm pump, plate and frame filter press and the sewage Buffer Pool that are connected in turn, and pneumatic diaphragm pump connects the second mud scratch pool; Described waste water treating and reutilizing unit comprises the tube settler, quartz sand filtration tank, absorbent charcoal adsorption tank and the reuse water tank that are connected in turn, tube settler is connected with sewage Buffer Pool, and reuse water tank connects three grades of Wet method vibration screens, roller-type stone washing machine and screw sand washers by pipeline.
Described feed bin is used for Polluted Soil and keeps in and system material loading, and top feeding port is provided with the screen cloth that aperture is 100mm, and in order to stop that ratchel enters drip washing repair system, described feed bin sidewall is equipped with broken arch motor and plate pulsator, prevents blanking from blocking; Described electric magnetic iron remover is for removing and reclaim the scrap iron in material loading Polluted Soil, and described electric magnetic iron remover is dry type, and its magnet exciting coil radiating mode is natural cooling type; Described three grades of Wet method vibration screens are Wei three screen clothes of 10mm, 5mm and 2mm not form by aperture from top to bottom, described three grades of Wet method vibration screen tops carry high-pressure spraying system, are cut and mechanical oscillation realize contaminated soil wet sieving and elementary drip washing by waterpower.
Described roller-type stone washing machine is used for the drip washing of >10mm gravel, relies on gravel to realize gravel and its surface being separated containing dirty particulate with current, gravel with friction mutual between equipment inner wall and gravel; Described screw sand washer is used for the drip washing of >1mm gravel, rely on gravel to realize grit and its surface being separated containing dirty particulate with current, gravel with friction mutual between stirring cage and gravel, and the clean gravel of realization pushes discharging and dehydration; Described first mud scratch pool, for confluxing and keeping in the lower mud of three grades of reciprocating sieves sieve, overflow mud after stone scrubber and sand washer drip washing, is equipped with the Pulp pump of mixer and more than in described first mud scratch pool; Described dither mesh size is 1mm, for carrying out being separated of mud coarse fodder and slurry liquid from pumping in the first mud scratch pool, oversize falls into screw sand washer, under the sieve of particle diameter <1mm, slurry liquid enters the second mud scratch pool, be provided with the first chemicals dosing plant above second mud scratch pool, the pipeline between the second mud scratch pool and the first chemicals dosing plant is equipped with measuring pump.
Described pneumatic diaphragm pump is used for including dirty particulate mud to pumping mud in plate and frame filter press second mud scratch pool, and described pneumatic diaphragm pump is furnished with air compressor machine as its source of the gas power; Described plate and frame filter press is used for containing the concentrated of sludge slurry and dehydration, and the aqueous phase outlet of filter press is connected with sewage Buffer Pool; Described sewage Buffer Pool is connected to follow-up sewage treatment unit through sewage pump.
Described tube settler connects the second chemicals dosing plant and the 3rd chemicals dosing plant respectively, and the pipeline between tube settler and the second chemicals dosing plant, the 3rd chemicals dosing plant is all equipped with measuring pump; Bottom described tube settler, sludge hopper is connected to the first mud scratch pool through sludge pipe; Described reuse water tank, in order to store through precipitation, filter, to adsorb the clean water after disposing, is equipped with immersible pump in described reuse water tank, is connected to three grades of Wet method vibration screens, roller-type stone washing machine and screw sand washers.
The concrete steps that Soil leaching repair system of the present invention carries out the method for Soil leaching reparation are as follows:
A () charging is sieved:
Contaminated soil is from feed bin charging, then electric magnetic iron remover is entered through belt conveyor, scrap iron in removing Polluted Soil and magnetic-particle, three grades of Wet method vibration screens are entered again by belt conveyor, high-pressure spraying system spray above three grades of Wet method vibration screens carries out elementary flushing by the recycle-water of coming in reuse water tank to contaminated soil, and the slime water of three grades of Wet method vibration screen generations enters the first mud scratch pool;
B () ore deposit is washed:
After three grades of elementary drip washing of Wet method vibration screen and sieving, the gravel that particle diameter is greater than 10mm enters roller-type stone washing machine, gravel rolls by endless spiral, pushes and the mutual friction effect of storeroom, the fine grained of adsorption and pollutant are entered drip washing slurries by wash-out, the first mud scratch pool is entered through pump extracting, the gravel cleaned up delivers into moisture gravel pond through belt conveyor, and in moisture gravel pond, leachate enters the first mud scratch pool; Particle diameter is that the gravel of 1-10mm enters screw sand washer, and clean gravel delivers into moisture coarse sand pond through belt conveyor, and leachate enters the first mud scratch pool; Have the recycle-water from reuse water tank to rinse gravel and grit above roller-type stone washing machine and screw sand washer, the slime water of generation all enters the first mud scratch pool; Mud in first mud scratch pool delivers to through Pulp pump the high frequency shale shaker that aperture is 1mm, and the oversize that particle diameter is greater than 1mm enters screw sand washer, and after friction cleaning, discharging is to moisture coarse sand pond; The slurries that particle diameter is less than 1mm enter the second mud scratch pool through sieve aperture;
(c) sludge dewatering:
Particle diameter is less than the slurries of 1mm after the second mud scratch pool is separated, upper strata sewage enters sewage Buffer Pool, lower floor's mud enters plate and frame filter press through pneumatic diaphragm pump, under the strong pressure of membrane pump pushes extruding, moisture outer row after filter-cloth filtering enters sewage Buffer Pool, is become mud cake after particulate dehydration by press filtration;
(d) waste water treating and reutilizing:
Sewage in sewage Buffer Pool squeezes into tube settler through sewage pump, and upper strata sewage after precipitation enters quartz sand filtration tank and filters out quartz sand, then enters absorbent charcoal adsorption tank and adsorb, and the clean water obtained enters reuse water tank; Tube settler base sludge enters the first mud scratch pool, is equipped with immersible pump, is connected to three grades of Wet method vibration screens, roller-type stone washing machine and screw sand washers in reuse water tank.
In step (b), the first chemicals dosing plant is provided with above second mud scratch pool, pipeline between second mud scratch pool and the first chemicals dosing plant is equipped with measuring pump, first chemicals dosing plant is built with flocculant, flocculant is joined in the second mud scratch pool by measuring pump, makes that the mud of the inside carries out flocculating, aggregate and precipitate.
In step (d), described tube settler connects the second chemicals dosing plant and the 3rd chemicals dosing plant respectively, and the pipeline between tube settler and the second chemicals dosing plant, the 3rd chemicals dosing plant is all equipped with measuring pump; In second chemicals dosing plant, sulfuric acid is housed, in the 3rd chemicals dosing plant, aluminium polychloride is housed, sulfuric acid and aluminium polychloride join in tube settler the sludge settling made wherein respectively by measuring pump.
Described Soil leaching repair system, after stone scrubber and sand washer drip washing, gravel and grit surface absorption, the particulate of adhering and pollutant are concentrated in the mud cake after press filtration by wash-out, transfer, and discharging gravel and gravel clean up to standard.
Described Soil leaching repair system, process water is clear water, adds without any eluent.
Described Soil leaching repair system, repairs after stain thing total amount through drip washing and does not change, just shifted, enrichment is concentrated in the mud cake after dehydration, reduce the contaminated soil volume needing final disposal.
Good effect of the present invention is as follows:
Soil leaching repair system of the present invention can engineer applied; be applicable to the drip washing reparation containing multiple pollutant soil; be particularly useful for the drip washing reparation of coarse granule content compared with high pollution soil, existing scale is applied to northeast Chemical Group contaminated site rehablitation project.
Soil leaching repair system of the present invention is a kind of drip washing repair system fast, and material is extremely short in the intrasystem time of staying, can significantly improve system production capacity and remediation efficiency.
Soil leaching repair system of the present invention is leacheate with pure water, avoids the secondary pollution caused because of the interpolation of chemical leaching; And leacheate can realize circulating and recovering, without wastewater disposition in whole system running after tail end sewage disposal system is disposed.
The clean gravel of discharging after Soil leaching repair system of the present invention reparation and gravel can be used as building materials and carry out resource, while repairing polluted soil, create new profit point, for the reparation of contaminated soil and disposal provide a kind of new approaches.
Soil leaching repair system of the present invention realizes auto-control, and overall process is without the need to a large amount of human inputs, and each teams and groups only need 2-3 name production operation personnel.
Soil leaching repair system of the present invention not only achieves the minimizing of contaminated soil remediation, greatly reduce comprehensive repair cost, and the resource reuse (coarse granule such as gravel, gravel) that can realize drip washing discharging, while repairing polluted soil, create new profit point, for the reparation of contaminated soil and disposal provide a kind of new approaches.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of Soil leaching repair system of the present invention.
1 feed bin, 2 electric magnetic iron removers, 3 three grades of Wet method vibration screens, 4 roller-type stone washing machines, 5 screw sand washers, 6 first mud scratch pools, 7 high frequency shale shakers, 8 second mud scratch pools, 9 pneumatic diaphragm pumps, 10 plate and frame filter press, 11 sewage Buffer Pools, 12 tube settlers, 13 quartz sand filtration tanks, 14 absorbent charcoal adsorption tanks, 15 reuse water tanks, 16 belt conveyors, 17 moisture gravel ponds, 18 moisture coarse sand ponds, 19 first chemicals dosing plants, 20 header tanks, 21 second chemicals dosing plants, 22 the 3rd chemicals dosing plants, 23 pending mud cake apparatus for temporary storage.
Detailed description of the invention
The following examples describe in further detail of the present invention.
As accompanying drawing 1 shows, Soil leaching repair system of the present invention comprises the four module unit be connected in turn: feeder screen subdivision, ore deposit wash the waste water treating and reutilizing unit of unit, sludge dewatering unit and tail end; Described feeder screen subdivision comprises the feed bin 1, electric magnetic iron remover 2 and the three grades of Wet method vibration screens 3 that are connected in turn; Described ore deposit is washed unit and is comprised: roller-type stone washing machine 4, screw sand washer 5, first mud scratch pool 6, high frequency shale shaker 7 and the second mud scratch pool 8, roller-type stone washing machine 4 is connected with three grades of Wet method vibration screens 3 respectively with the front end of screw sand washer 5, roller-type stone washing machine 4 is connected with mud scratch pool 6 respectively with the rear end of screw sand washer 5, and the first mud scratch pool 6, high frequency shale shaker 7 and the second mud scratch pool 8 are connected in turn; Described sludge dewatering unit comprises the pneumatic diaphragm pump 9, plate and frame filter press 10 and the sewage Buffer Pool 11 that are connected in turn, and pneumatic diaphragm pump 9 connects the second mud scratch pool 8; Described waste water treating and reutilizing unit comprises the tube settler 12, quartz sand filtration tank 13, absorbent charcoal adsorption tank 14 and the reuse water tank 15 that are connected in turn, tube settler 12 is connected with sewage Buffer Pool 11, and reuse water tank 15 connects three grades of Wet method vibration screens 3, roller-type stone washing machine 4 and screw sand washer 5 by pipeline.
Described feed bin 1 is temporary and system material loading for Polluted Soil, and top feeding port is provided with the screen cloth that aperture is 100mm, and in order to stop that ratchel enters drip washing repair system, described feed bin 1 sidewall is equipped with broken arch motor and plate pulsator, prevents blanking from blocking; Described electric magnetic iron remover 2 is for removing and reclaim the scrap iron in material loading Polluted Soil, and described electric magnetic iron remover 2 is dry type, and its magnet exciting coil radiating mode is natural cooling type; Described three grades of Wet method vibration screens 3 are Wei three screen clothes of 10mm, 5mm and 2mm not form by aperture from top to bottom, described three grades of Wet method vibration screen 3 tops carry high-pressure spraying system, are cut and mechanical oscillation realize contaminated soil wet sieving and elementary drip washing by waterpower.
Described roller-type stone washing machine 4, for the drip washing of >10mm gravel, relies on gravel to realize gravel and its surface being separated containing dirty particulate with current, gravel with friction mutual between equipment inner wall and gravel; Described screw sand washer 5, for the drip washing of >1mm gravel, rely on gravel to realize grit and its surface being separated containing dirty particulate with current, gravel with friction mutual between stirring cage and gravel, and the clean gravel of realization pushes discharging and dehydration; Described first mud scratch pool 6 sieves lower mud, overflow mud after stone scrubber 4 and sand washer 5 drip washing for confluxing and keeping in three grades of reciprocating sieves 3, is equipped with the Pulp pump of mixer and more than in described first mud scratch pool 6; Described high frequency shale shaker 7 aperture is 1mm, for carrying out being separated of mud coarse fodder and slurry liquid from pumping in the first mud scratch pool 6, oversize falls into screw sand washer 5, under the sieve of particle diameter <1mm, slurry liquid enters the second mud scratch pool 8, be provided with above second mud scratch pool 8 on the pipeline between first chemicals dosing plant 19, second mud scratch pool 8 and the first chemicals dosing plant 19 and be equipped with measuring pump.
Described pneumatic diaphragm pump 9 is for including dirty particulate mud to pumping mud second mud scratch pool 8 in plate and frame filter press 10, and described pneumatic diaphragm pump 9 is furnished with air compressor machine as its source of the gas power; Described plate and frame filter press 10 is for concentrating and dehydration containing sludge slurry, and the aqueous phase outlet of filter press 10 is connected with sewage Buffer Pool 11; Described sewage Buffer Pool 11 is connected to follow-up sewage treatment unit through sewage pump.
Described tube settler 12 connects the second chemicals dosing plant 21 and the 3rd chemicals dosing plant 22 respectively, and the pipeline between tube settler 12 and the second chemicals dosing plant 21, the 3rd chemicals dosing plant 22 is all equipped with measuring pump; Bottom described tube settler 12, sludge hopper is connected to the first mud scratch pool 6 through sludge pipe; Described reuse water tank 15, in order to store through precipitation, filter, to adsorb the clean water after disposing, is equipped with immersible pump in described reuse water tank 15, is connected to three grades of Wet method vibration screens 3, roller-type stone washing machine 4 and screw sand washer 5.
The concrete steps that Soil leaching repair system of the present invention carries out the method for Soil leaching reparation are as follows:
A () charging is sieved:
Contaminated soil is from feed bin 1 charging, then electric magnetic iron remover 2 is entered through belt conveyor, scrap iron in removing Polluted Soil and magnetic-particle, three grades of Wet method vibration screens 3 are entered again by belt conveyor, high-pressure spraying system spray above three grades of Wet method vibration screens 3 carries out elementary flushing by the recycle-water of coming in reuse water tank 15 to contaminated soil, and the slime water of three grades of Wet method vibration screen 3 generations enters the first mud scratch pool 6;
B () ore deposit is washed:
After three grades of elementary drip washing of Wet method vibration screen 3 and sieving, the gravel that particle diameter is greater than 10mm enters roller-type stone washing machine 4, gravel rolls by endless spiral, pushes and the mutual friction effect of storeroom, the fine grained of adsorption and pollutant are entered drip washing slurries by wash-out, the first mud scratch pool 6 is entered through pump extracting, the gravel cleaned up delivers into moisture gravel pond 17 through belt conveyor, and in moisture gravel pond 17, leachate enters the first mud scratch pool 6; Particle diameter is that the gravel of 1-10mm enters screw sand washer 5, and the gravel cleaned delivers into moisture coarse sand pond 18 through belt conveyor, and leachate enters the first mud scratch pool 6; Have the recycle-water from reuse water tank 15 to rinse gravel and grit above roller-type stone washing machine 4 and screw sand washer 5, the slime water of generation all enters the first mud scratch pool 6; Mud in first mud scratch pool 6 delivers to through Pulp pump the high frequency shale shaker 7 that aperture is 1mm, and the oversize that particle diameter is greater than 1mm enters screw sand washer 5, and after friction cleaning, discharging is to moisture coarse sand pond 18; The slurries that particle diameter is less than 1mm enter the second mud scratch pool 8 through sieve aperture;
(c) sludge dewatering:
Particle diameter is less than the slurries of 1mm after the second mud scratch pool 8 is separated, upper strata sewage enters sewage Buffer Pool 11, lower floor's mud enters plate and frame filter press 10 through pneumatic diaphragm pump 9, under the strong pressure of membrane pump pushes extruding, moisture outer row after filter-cloth filtering enters sewage Buffer Pool 11, is become mud cake after particulate dehydration by press filtration;
(d) waste water treating and reutilizing:
Sewage in sewage Buffer Pool 11 squeezes into tube settler 12 through sewage pump, and upper strata sewage after precipitation enters quartz sand filtration tank 13 and filters out quartz sand, then enters absorbent charcoal adsorption tank 14 and adsorb, and the clean water obtained enters reuse water tank 15; Tube settler 12 base sludge enters mud scratch pool 6, is equipped with immersible pump, is connected to three grades of Wet method vibration screens 3, roller-type stone washing machine 4 and screw sand washer 5 in reuse water tank 15.
In step (b), the first chemicals dosing plant 19 is provided with above second mud scratch pool 8, pipeline between second mud scratch pool 8 and the first chemicals dosing plant 19 is equipped with measuring pump, first chemicals dosing plant 19 is built with flocculant, flocculant is joined in the second mud scratch pool 8 by measuring pump, makes that the mud of the inside carries out flocculating, aggregate and precipitate.
In step (d), described tube settler 12 connects the second chemicals dosing plant 21 and the 3rd chemicals dosing plant 22 respectively, and the pipeline between tube settler 12 and the second chemicals dosing plant 21, the 3rd chemicals dosing plant 22 is all equipped with measuring pump; In second chemicals dosing plant 21, sulfuric acid is housed, in the 3rd chemicals dosing plant 22, aluminium polychloride is housed, sulfuric acid and aluminium polychloride join in tube settler 12 sludge settling made wherein respectively by measuring pump.
Embodiment 1
Northeast Chemical Group contaminated site rehablitation project.This project place is formed by marine reclamation land, and shallow stratum lithology is primarily of rubble, backfill dregs and part of clay composition, and local is cement flooring, building waste, muck soil etc.These place soil major pollutants be with arsenic be representative 3 heavy metal species and take benzo (a) pyrene as 7 kinds of polycyclic aromatic hydrocarbons of representative, need repair that to pollute earth volume be 27.9 ten thousand sides, adopt Soil leaching system of the present invention to repair.Soil leaching device systems in normal duty situation, average treatment efficiency be 15 sides/hour.System carrying out practically process as shown in Figure 1.
Remove the contaminated soil of ratchel (>100mm) from feeding warehouse 1 material loading through pretreatment, transmitted entering electric magnetic iron remover 2 by conveyer belt, reclaim scrap iron in Polluted Soil and magnetic-particle through the electric magnetic iron remover 2 be arranged on above charging transport tape.
Contaminated soil transfers to three grades of Wet method vibration screens 3 through conveyer belt, and vibratory sieve is Wei three screen clothes of 10mm, 5mm and 2mm not form by aperture from top to bottom, and the shower nozzle carried above vibratory sieve can spray high pressure drip washing fresh water (FW).Under the dissection of the physical vibration of vibratory sieve, friction and high-pressure spraying current, Polluted Soil forms slurry mixture, can realize soil coarse granule and fine grain wet separation.
After elementary drip washing and sieving, the gravel that particle diameter is greater than 10mm enters roller-type stone washing machine 4, gravel rolls by endless spiral, pushes and the mutual friction effect of storeroom, the fine grained of adsorption and pollutant are entered drip washing slurries by wash-out, enter the first mud scratch pool 6 by header tank 20 through pump extracting, the gravel cleaned up delivers into moisture gravel pond 17 through conveyer belt.
After elementary drip washing and sieving, particle diameter is that the gravel of 1-10mm enters screw sand washer 5.Sand washer forms sedimentation basin in the tank bottom tilted, and spiral head submerges in sedimentation basin, feeds rinse water bottom sedimentation basin, completes cleaning and the dehydration of gravel in cage.The gravel cleaned delivers into moisture coarse sand pond 18 through conveyer belt, and drip washing slurries enter the first mud scratch pool 6.
First mud scratch pool 6 is for confluxing and temporary drip washing mud, and in pond, mud has three sources, is respectively: mud under three grades of Wet method vibration screen 3 drops, mud that roller-type stone washing machine 4 leaks down and the mud through screw sand washer 5 overflow.The Pulp pump of mixer and more than one is equipped with in first mud scratch pool 6, in pond, mud delivers to through Pulp pump the high frequency shale shaker 7 that aperture is 1mm, the oversize that particle diameter is greater than 1mm enters screw sand washer 5, mix with the gravel of 1-10mm in cage, after friction cleaning, discharging is to moisture coarse sand pond 18; The slurries that particle diameter is less than 1mm enter the second mud scratch pool 8 through sieve aperture, enter plate and frame filter press 10 through membrane pump 9 extracting.
After high-frequency screen 7 filters, the drip washing mud of particle diameter <1mm pushes through membrane pump 9 and enters plate and frame filter press 10.Plate and frame filter press 10 is the equipment that suspension solid, liquid two-phase is separated, and under the strong pressure of membrane pump 9 pushes extruding, moisture outer row after filter-cloth filtering enters sewage Buffer Pool 11, is become mud cake after particulate dehydration by press filtration.
The aqueous phase be press-filtered out enters sewage Buffer Pool 11, after after sewage treatment unit process, realize circulating and recovering.Sewage treatment unit comprises three monomers: tube settler 12(is containing acid-base modifier and flocculant add-on system), quartz sand filtration tank 13, absorbent charcoal adsorption tank 14.Water quality after sewage disposal system precipitation, filtration, absorption can meet reuse requirement, is disposed to reuse water tank 15, is reused for drip washing explained hereafter.Bottom tube settler 12, in sludge hopper, precipitating sludge is connected to the first mud scratch pool 6 through pipeline, and enters most in the mud cake after press filtration.
Contaminated soil is after this drip washing repair system is disposed, and discharging is divided into 5 classes, is respectively magnetic separation component, gravel, gravel, mud cake and drip washing sewage.
The magnetic separation component produced through Soil leaching system directly can carry out the utilization of resources.The metal sundries wherein magneticly elected carries out waste recovery, and iron-containing slag carries out resource reuse (can be used as raw materials for metallurgy or cement slurry).
Produce through Soil leaching system, the gravel (10-100mm) of acceptance(check) and gravel (1-10mm) its character of use is unrestricted or impact, directly can carry out backfill in field, or carry out resource reuse as building materials.
Through the mud cake of concentrated, the enrichment pollutant that Soil leaching system produces, pollute character according to it and carry out final disposal: the mud cake that heavy metal is polluted is cured/stabilization processes, the heat treatments such as cement kiln burning are carried out to the mud cake containing polycyclic aromatic hydrocarbon dye.
This cover Soil leaching system sewage can realize circulating and recovering after the sewage disposal system disposal of tail end is up to standard, decreases the water consumption of system on the one hand, reduces rehabilitation cost; On the other hand, avoid the discharge of sewage, do not bring new pollutional load to environment, achieve the doulbe-sides' victory of economic benefit and environmental benefit.
Through the mud cake of concentrated, the enrichment pollutant that Soil leaching system produces, pollute character according to it and carry out final disposal: the mud cake that heavy metal is polluted is cured/stabilization processes, the heat treatments such as cement kiln burning are carried out to the mud cake containing polycyclic aromatic hydrocarbon dye.Mud cake quality in the present embodiment after Soil leaching repair system decrement concentrates only accounts for about 20% of charging Polluted Soil, and namely this cover Soil leaching repair system can realize the minimizing of about 80% to this contaminated soil of site.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalents thereof.
Claims (8)
1. concentrate a Soil leaching repair system for design concept based on decrement, it is characterized in that: described drip washing repair system comprises the four module unit be connected in turn: feeder screen subdivision, ore deposit wash the waste water treating and reutilizing unit of unit, sludge dewatering unit and tail end; Described feeder screen subdivision comprises feed bin (1) connected in turn, electric magnetic iron remover (2) and three grades of Wet method vibration screens (3); Described ore deposit is washed unit and is comprised: roller-type stone washing machine (4), screw sand washer (5), the first mud scratch pool (6), high frequency shale shaker (7) and the second mud scratch pool (8), roller-type stone washing machine (4) is connected with three grades of Wet method vibration screens (3) respectively with the front end of screw sand washer (5), roller-type stone washing machine (4) is connected with the first mud scratch pool (6) respectively with the rear end of screw sand washer (5), and the first mud scratch pool (6), high frequency shale shaker (7) and the second mud scratch pool (8) are connected in turn; Described sludge dewatering unit comprises the pneumatic diaphragm pump (9), plate and frame filter press (10) and the sewage Buffer Pool (11) that are connected in turn, and pneumatic diaphragm pump (9) connects the second mud scratch pool (8); Described waste water treating and reutilizing unit comprises the tube settler (12), quartz sand filtration tank (13), absorbent charcoal adsorption tank (14) and the reuse water tank (15) that are connected in turn, tube settler (12) is connected with sewage Buffer Pool (11), and reuse water tank (15) connects three grades of Wet method vibration screens (3), roller-type stone washing machine (4) and screw sand washer (5) by pipeline.
2. the Soil leaching repair system concentrating design concept based on decrement as claimed in claim 1, it is characterized in that: described feed bin (1) is temporary and system material loading for Polluted Soil, top feeding port is provided with the screen cloth that aperture is 100mm, in order to stop that ratchel enters drip washing repair system, described feed bin (1) sidewall is equipped with broken arch motor and plate pulsator, prevents blanking from blocking; Described electric magnetic iron remover (2) is for removing and reclaim the scrap iron in material loading Polluted Soil, and described electric magnetic iron remover (2) is dry type, and its magnet exciting coil radiating mode is natural cooling type; Described three grades of Wet method vibration screens (3) are Wei three screen clothes of 10mm, 5mm and 2mm not form by aperture from top to bottom, described three grades of Wet method vibration screen (3) tops carry high-pressure spraying system, are cut and mechanical oscillation realize contaminated soil wet sieving and elementary drip washing by waterpower.
3. the Soil leaching repair system concentrating design concept based on decrement as claimed in claim 1, it is characterized in that: described roller-type stone washing machine (4), for the drip washing of >10mm gravel, relies on gravel to realize gravel and its surface being separated containing dirty particulate with current, gravel with friction mutual between equipment inner wall and gravel; Described screw sand washer (5) is for the drip washing of >1mm gravel, rely on gravel to realize grit and its surface being separated containing dirty particulate with current, gravel with friction mutual between stirring cage and gravel, and the clean gravel of realization push discharging and dehydration; Described first mud scratch pool (6) for confluxing and keeping in the lower mud of three grades of reciprocating sieves (3) sieve, overflow mud after stone scrubber (4) and sand washer (5) drip washing, the Pulp pump of outfit mixer and more than in described first mud scratch pool (6); Described high frequency shale shaker (7) aperture is 1mm, for carrying out being separated of mud coarse fodder and slurry liquid from pumping in the first mud scratch pool (6), oversize falls into screw sand washer (5), under the sieve of particle diameter <1mm, slurry liquid enters the second mud scratch pool (8), second mud scratch pool (8) top is provided with the first chemicals dosing plant (19), and the pipeline between the second mud scratch pool (8) and the first chemicals dosing plant (19) is equipped with measuring pump.
4. the Soil leaching repair system concentrating design concept based on decrement as claimed in claim 1, it is characterized in that: described pneumatic diaphragm pump (9) is for including dirty particulate mud to plate and frame filter press (10) interior pumping mud second mud scratch pool (8), and described pneumatic diaphragm pump (9) is furnished with air compressor machine as its source of the gas power; Described plate and frame filter press (10) is for concentrating and dehydration containing sludge slurry, and the aqueous phase outlet of filter press (10) is connected with sewage Buffer Pool (11); Described sewage Buffer Pool (11) is connected to follow-up sewage treatment unit through sewage pump.
5. the Soil leaching repair system concentrating design concept based on decrement as claimed in claim 1, it is characterized in that: described tube settler (12) connects the second chemicals dosing plant (21) and the 3rd chemicals dosing plant (22) respectively, the pipeline between tube settler (12) and the second chemicals dosing plant (21), the 3rd chemicals dosing plant (22) is all equipped with measuring pump; Described tube settler (12) bottom sludge hopper is connected to the first mud scratch pool (6) through sludge pipe; Described reuse water tank (15), in order to store through precipitation, filter, to adsorb the clean water after disposing, is equipped with immersible pump in described reuse water tank (15), is connected to three grades of Wet method vibration screens (3), roller-type stone washing machine (4) and screw sand washer (5).
6. utilize the Soil leaching repair system as described in any one of claim 1-5 to carry out a method for Soil leaching reparation, it is characterized in that: the concrete steps of described method are as follows:
A () charging is sieved:
Contaminated soil is from feed bin (1) charging, then electric magnetic iron remover (2) is entered through belt conveyor, scrap iron in removing Polluted Soil and magnetic-particle, three grades of Wet method vibration screens (3) are entered again by belt conveyor, the high-pressure spraying system spray of three grades of Wet method vibration screens (3) top carries out elementary flushing by the recycle-water of coming in reuse water tank (15) to contaminated soil, and the slime water that three grades of Wet method vibration screens (3) produce enters the first mud scratch pool (6);
B () ore deposit is washed:
After the elementary drip washing of three grades of Wet method vibration screens (3) and sieving, the gravel that particle diameter is greater than 10mm enters roller-type stone washing machine (4), gravel rolls by endless spiral, pushes and the mutual friction effect of storeroom, the fine grained of adsorption and pollutant are entered drip washing slurries by wash-out, the first mud scratch pool (6) is entered through pump extracting, the gravel cleaned up delivers into moisture gravel pond (17) through belt conveyor, and in moisture gravel pond (17), leachate enters the first mud scratch pool (6); Particle diameter is that the gravel of 1-10mm enters screw sand washer (5), and the gravel cleaned delivers into moisture coarse sand pond (18) through belt conveyor, and leachate enters the first mud scratch pool (6); Roller-type stone washing machine (4) and screw sand washer (5) top have the recycle-water from reuse water tank (15) to rinse gravel and grit, and the slime water of generation all enters the first mud scratch pool (6); Mud in first mud scratch pool (6) delivers to through Pulp pump the high frequency shale shaker (7) that aperture is 1mm, and the oversize that particle diameter is greater than 1mm enters screw sand washer (5), and after friction cleaning, discharging is to moisture coarse sand pond (18); The slurries that particle diameter is less than 1mm enter the second mud scratch pool (8) through sieve aperture;
(c) sludge dewatering:
Particle diameter is less than the slurries of 1mm after the second mud scratch pool (8) is separated, upper strata sewage enters sewage Buffer Pool (11), lower floor's mud enters plate and frame filter press (10) through pneumatic diaphragm pump (9), under the strong pressure of membrane pump pushes extruding, moisture outer row after filter-cloth filtering enters sewage Buffer Pool (11), is become mud cake after particulate dehydration by press filtration;
(d) waste water treating and reutilizing:
Sewage in sewage Buffer Pool (11) squeezes into tube settler (12) through sewage pump, upper strata sewage after precipitation enters quartz sand filtration tank (13) and filters out quartz sand, enter absorbent charcoal adsorption tank (14) again to adsorb, the clean water obtained enters reuse water tank (15); Tube settler (12) base sludge enters the first mud scratch pool (6), is equipped with immersible pump, is connected to three grades of Wet method vibration screens (3), roller-type stone washing machine (4) and screw sand washer (5) in reuse water tank (15).
7. the method for Soil leaching reparation as claimed in claim 6, it is characterized in that: in step (b), second mud scratch pool (8) top is provided with the first chemicals dosing plant (19), pipeline between second mud scratch pool (8) and the first chemicals dosing plant (19) is equipped with measuring pump, first chemicals dosing plant (19) is built with flocculant, flocculant is joined in the second mud scratch pool (8) by measuring pump, makes that the mud of the inside carries out flocculating, aggregate and precipitate.
8. the method for Soil leaching reparation as claimed in claim 6, it is characterized in that: in step (d), described tube settler (12) connects the second chemicals dosing plant (21) and the 3rd chemicals dosing plant (22) respectively, and the pipeline between tube settler (12) and the second chemicals dosing plant (21), the 3rd chemicals dosing plant (22) is all equipped with measuring pump; Second chemicals dosing plant is equipped with sulfuric acid in (21), in the 3rd chemicals dosing plant (22), aluminium polychloride is housed, and sulfuric acid and aluminium polychloride join in tube settler (12) sludge settling made wherein respectively by measuring pump.
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