CN109092870B - Chromium-polluted building rubbish pickling system and pickling method thereof - Google Patents
Chromium-polluted building rubbish pickling system and pickling method thereof Download PDFInfo
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- CN109092870B CN109092870B CN201811308428.7A CN201811308428A CN109092870B CN 109092870 B CN109092870 B CN 109092870B CN 201811308428 A CN201811308428 A CN 201811308428A CN 109092870 B CN109092870 B CN 109092870B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/58—Construction or demolition [C&D] waste
Abstract
The invention discloses a chromium-polluted building rubbish pickling system and a pickling method thereof, wherein the pickling system comprises a sulfuric acid storage tank, an alkali liquor storage tank, a medicament stirring tank, a water storage and drainage tank, a pump tank, a pickling tank body with a rectangular section and a medicament distribution pipeline, wherein one side of the sulfuric acid storage tank is provided with an acid discharge port, the other side of the sulfuric acid storage tank is provided with a discharge port, and the discharge port of the sulfuric acid storage tank is connected with a first feed port of the medicament stirring tank through the pipeline; the top of the medicament stirring tank is also provided with a second feed inlet and a water inlet for adding ferrous sulfate; one side of the water storage and drainage tank is provided with a pickling tank body; a medicine distribution pipeline is arranged along the long side of one side of the pickling tank body; the treatment liquid after the garbage is immersed and washed flows back to the water storage and drainage tank through the discharge hole of the immersing and washing tank body and is discharged through the waste liquid pipeline arranged at the bottom of the water storage and drainage tank. Short treatment period, complete flow, simple and convenient operation in the pickling process and good repairing effect. The pickling tank body has an anti-seepage function, and liquid medicament forms a liquid seal on construction waste in the pickling process, so that dust emission is avoided.
Description
Technical Field
The invention relates to the technical field of construction waste treatment, in particular to a chromium-polluted construction waste pickling system and a pickling method thereof.
Background
The chromium pollution site type mainly comprises a chromium slag yard, a chromium salt factory legacy site and a chromium salt product downstream user enterprise legacy site, and in the process that the chromium salt factory, a downstream enterprise such as electroplating and tanning are moved along with industrial upgrading, the buildings of the original site are removed on site, so that tens of thousands of chromium pollution concrete, brick and other building wastes are formed. In the production process of chromium salt factories for decades, original factory buildings and structures, particularly original production workshops, are severely polluted, the hexavalent chromium concentration of part of construction waste reaches hundreds of mg/kg, the leaching concentration of hexavalent chromium reaches tens of mg/l, which is far higher than the limit value of common industrial solid waste entering a landfill site, and the construction waste can be safely landfilled after treatment.
Chromium-polluted building waste in chromium salt factories is always a difficult point for repairing chromium pollution, and the current repairing thought of the chromium-polluted building waste is derived from a reduction stabilization treatment technology of chromium-polluted soil and a chromium slag wet detoxification technology. In the past, leaching technology and enhanced heap leaching repair technology have been adopted.
The leaching technology is that after the construction waste is crushed and screened, the construction waste is conveyed to a leaching area, clean water or medicament is sprayed by a high-pressure water gun to leach chromium-polluted construction waste, and leaching liquid is collected and treated, and the using device and the material mainly comprise a high-pressure spraying device, a liquid collecting device and the like. The main problems are: the leaching technical agent or clear water has short residence time, and the repairing requirement can not be met for chromium-polluted building rubbish with poor permeability or long pollution time and high pollution degree.
The reinforced heap leaching technology is that building rubbish is piled into a heap leaching tank, then reducing agent, organic fertilizer, glucose and the like are added into a building rubbish pile body to carry out reduction reaction, a biological film is laid on the outer side of the pile body, then a building rubbish sample is collected to carry out detection, if hexavalent chromium concentration does not reach the standard, reduction reaction and detection are carried out sequentially, finally liquid in the heap leaching tank is discharged, and the using device and the material mainly comprise the heap leaching tank, the biological film, a spraying pipeline and the like. The enhanced heap leaching technology (CN 107745001A) can generally achieve the aim of repairing, but has long treatment period, high crushing and screening requirements, complicated working procedures caused by the need of adding medicaments for many times in the treatment process, and continuous prolongation of heap leaching time according to the repairing effect, and has the following problems: the repair cost is uncontrollable, the repair engineering period is long, and the requirements of the current site repair market on the construction period can not be met.
At present, the technical scheme of the construction waste treatment of the chromium-polluted site has the defects of poor effect, complex working procedure, long treatment period and the like, and devices and materials used in the waste treatment process have no unified standard and cannot form a complete system, so that the equipment occupies large space, the construction period is long, and potential safety hazards exist.
Disclosure of Invention
The invention aims to provide a chromium-polluted building rubbish pickling system and a pickling method thereof, which aim to solve the technical problems of long treatment time, complex treatment procedures, imperfect treatment system, poor repairing technical effect and the like of polluted building rubbish.
In order to achieve the above purpose, the invention adopts the following technical scheme: the pickling system comprises a sulfuric acid storage tank, an alkali liquor storage tank, a medicament stirring tank, a water storage and drainage tank, a pump tank, a rectangular pickling tank body with a cross section and a medicament distribution pipeline, wherein an acid discharge port is formed in one side of the sulfuric acid storage tank, a discharge port is formed in the other side of the sulfuric acid storage tank, and the discharge port of the sulfuric acid storage tank is connected with a first feed port of the medicament stirring tank through the pipeline;
the top of the medicament stirring tank is also provided with a second feed inlet and a water inlet for adding ferrous sulfate;
an alkali discharge port is formed in one side of the alkali liquor storage tank, a discharge port is formed in the other side of the alkali liquor storage tank, the discharge port of the alkali liquor storage tank is connected with a medicine distribution pipeline through a pipeline, and a valve is further arranged between the discharge port of the alkali liquor storage tank and the medicine distribution pipeline;
one side of the water storage and drainage tank is provided with a pickling tank body; a medicine distribution pipeline is arranged along the long side of one side of the pickling tank body;
the prepared treatment liquid in the medicament stirring tank is sent to a feed inlet of a water storage and drainage tank through a discharge port arranged at the bottom of the medicament stirring tank; the discharge port of the water storage and drainage tank is connected with a medicine distribution pipeline through a pipeline;
the treatment liquid after the garbage is immersed and washed flows back to the water storage and drainage tank through the discharge hole of the immersing and washing tank body and is discharged through the waste liquid pipeline arranged at the bottom of the water storage and drainage tank.
Further, the outer sides of the sulfuric acid storage tank, the medicament stirring tank and the alkali liquor storage tank are provided with cofferdams with the height of at least 0.6 m.
Further, the size of the pickling tank body is 25×9×2.25m, and the thickness of the tank wall is 0.4m.
Further, the bottom of the immersion tank body is obliquely arranged, and the top surface of the bottom of the tank far away from one side of the water storage and drainage tank is higher than the top surface of the bottom of the tank near one side of the water storage and drainage tank.
Further, the length of the medicine distribution pipeline is adapted to the length of the long side of the pickling tank body.
Further, at least four medicine inlet valves are arranged on the medicine distribution pipeline.
Further, the pump pool is arranged at one side of the water storage and drainage pool and is close to the pickling pool body; the pump pool is connected with the water storage and drainage pool through a pipeline.
Further, the top of the pump pool is provided with a rain shed.
Further, the capacity of the sulfuric acid storage tank is 8-12m 3 The method comprises the steps of carrying out a first treatment on the surface of the The sulfuric acid storage tank is made of PVC.
Further, the capacity of the medicament stirring tank is 8-12m 3 The method comprises the steps of carrying out a first treatment on the surface of the The material of the medicament stirring tank is steel lining plastic.
Another aspect of the invention provides a pickling method of the chromium-contaminated construction waste pickling system, comprising the following specific steps:
firstly, crushing and screening construction wastes, conveying original construction waste crushed aggregates of a plurality of centimeters to tens of centimeters formed during site dismantling to a workshop, and crushing to 2-5cm;
step two, screening to remove soil mixed in the original construction waste;
step three, conveying the sieved construction waste into a pickling tank body, and uniformly stacking, wherein the stacking height is 1.2m;
preparing a treatment liquid and performing pickling;
mixing ferrous sulfate and sulfuric acid in a medicament stirring tank to obtain a treating fluid for pickling, conveying the treating fluid into a feed inlet of a water storage and drainage tank through a pipeline through a discharge port arranged at the bottom of the medicament stirring tank, opening a medicine feeding valve on a medicine distribution pipeline, stopping feeding the treating fluid when the treating fluid is 0.5-0.8m higher than a building rubbish pile, and pickling for 12 hours;
fifthly, flowing the treatment liquid after pickling the garbage into a water storage and drainage tank through a discharge hole of a pickling tank body;
step six, detecting the treatment liquid in the water storage and drainage pool; if the standard is met, recycling the medicament, otherwise, discharging the medicament into a sewage treatment facility or other designated positions through a waste liquid pipeline arranged at the bottom of the water storage and drainage tank;
step seven, alkali liquor neutralization, wherein the alkali liquor level is required to be 0.5-0.8m higher than the building rubbish pile body, and the alkali liquor neutralization time is 4 hours, because the pickling treatment liquor is acidic, so that the pH value of the building rubbish can reach the restoration standard, a valve at the discharge port of an alkali liquor storage tank is opened, and alkali liquor is added into the pickling tank body through a medicine distribution pipeline;
step eight, emptying the alkali liquor of which the residual acid of the construction waste is neutralized;
step nine, self-checking and accepting, namely transporting out the construction waste subjected to pickling treatment from a pickling tank body by using a forklift, stacking the construction waste in a cleaning temporary storage area, and taking a treated sample for checking;
and step ten, if the detection result cannot reach the restoration target, sending back into the pickling tank again, and repeating the steps four to nine.
Further, the treating fluid for pickling in the step four is formed by mixing ferrous sulfate and sulfuric acid, wherein the mass adding ratio of the ferrous sulfate to the construction waste is 5-10%, and the mass adding ratio of the 28% sulfuric acid to the construction waste is 1-2%.
The beneficial effects of the invention are as follows:
1, the pickling system and the pickling method for chromium-polluted building waste provided by the invention have reasonable and standard design, and the design meets the relevant standards of the national polluted site repair industry. The technical scheme is complete and can efficiently complete the whole process of mixing, pickling reaction, neutralization adjustment, treatment fluid detection and discharge of the construction waste medicament, and simultaneously realize the functions of medicament circulation, real-time monitoring and adjustment.
2, the pickling method increases the treatment grain size of the construction waste from below 2cm to 2-5cm, reduces the load of crushing and screening equipment, and shortens the pretreatment time.
3, compared with the leaching technology, the leaching method provided by the invention has the advantages that the contact time of the leaching reagent solution and the construction waste is long, and the leaching of hexavalent chromium and the reduction of ferrous salt are more sufficient. After the construction waste is sent into the pickling system, the operation of the pickling process is simple and convenient, the construction waste stays in the pickling tank for 24 hours, the pickling time can be properly prolonged to 2-4 days for achieving the repairing target, the repairing effect is good, and the method is suitable for repairing chromium-polluted construction waste in various chromium-polluted sites. Compared with heap leaching technology, the method has better time controllability.
4, space and processing time are saved. The water storage and drainage pool bears different functions in the sequencing batch process. When the treatment liquid is prepared, the treatment liquid can be sent into a water storage and drainage tank for temporary storage; after the treatment liquid is used for immersing and washing a batch of construction waste, the treatment liquid naturally flows back into the water storage and drainage tank along the gradient of the tank bottom. And (3) measuring the property of the treatment liquid after the pickling reaction, recycling the treatment liquid if the treatment liquid reaches the standard capable of being continuously used, and otherwise, discharging the treatment liquid into a sewage treatment facility or other designated positions through a waste liquid pipeline arranged at the bottom of the drainage pool. The treatment process is complete, reasonable, economical and practical.
5, the pickling tank body has an anti-seepage function, liquid medicament forms a liquid seal on construction waste in the pickling process, dust emission is avoided, secondary pollution can be effectively avoided, engineering feasibility is better, and the pickling tank has better application and popularization prospects.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The main objects and other advantages of the invention may be realized and attained by means of the instrumentalities and particularly pointed out in the specification and claims.
Drawings
The invention is described in further detail below with reference to the accompanying drawings.
FIG. 1 is a top view of example 1;
FIG. 2 is a top view of example 2
FIG. 3 is a top view of example 3;
FIG. 4 is a left side view of example 3;
fig. 5 is a front view of embodiment 3.
Reference numerals: 1-sulfuric acid storage tank, 2-medicament stirring tank, 3-pickling tank body, 4-water storage and drainage tank, 5-pump tank, 6-medicament distribution pipeline and 7-alkali liquor storage tank.
Detailed Description
The following examples are given by way of illustration only and are not to be construed as limiting the scope of the invention.
The principle of the invention is based on chromium slag wet detoxification technology. Hexavalent chromium is water-soluble salt, and building waste such as concrete and brick has the characteristics of surface enrichment and internal chromium pollution, and is alkaline, so sulfuric acid and ferrous sulfate are prepared into a pickling agent, the leaching of hexavalent chromium pollutants in the building waste is accelerated through sulfuric acid soaking, the hexavalent chromium is reduced into trivalent chromium by ferrous ions in solution, and the solution is emptied after pickling is finished, so that the aim of eliminating the chromium pollution of the building waste is finally achieved.
Example 1
As shown in FIG. 1, the invention provides a chromium-contaminated construction waste pickling system comprising a capacity of 8-12m 3 The modified PVC sulfuric acid storage tank 1 has the capacity of 8-12m 3 The device comprises an alkali liquor storage tank 7 with steel lining plastic, a medicament stirring tank 2, a water storage and drainage tank 4, a pump tank 5, a rectangular pickling tank body 3 with a rectangular section and a medicament distribution pipeline 6, wherein an acid discharge opening is formed in one side of a sulfuric acid storage tank 1, a discharge opening is formed in the other side of the sulfuric acid storage tank 1, and the discharge opening of the sulfuric acid storage tank 1 is connected with a first feed opening of the medicament stirring tank 2 through a pipeline; the top of the medicament stirring tank 2 is also provided with a second feed inlet and a water inlet for adding ferrous sulfate. One side of the alkali liquor storage tank 7 is provided withThere is alkali discharge opening, and the opposite side of alkali lye storage tank 7 is provided with the discharge gate, and the discharge gate of alkali lye storage tank 7 passes through the pipeline to be connected with cloth medicine pipeline 6, still is provided with the valve between the discharge gate of alkali lye storage tank 7 and the cloth medicine pipeline 6.
The outer surface of the medicament stirring tank 2 is also coated with an anti-corrosion paint. The mass adding ratio of ferrous sulfate to the construction waste is 5-10%, and the mass adding ratio of 28% sulfuric acid to the construction waste is 1-2%. Sulfuric acid liquid is input from a first feed inlet of the medicament stirring tank 2, ferrous sulfate is input through a second feed inlet, water is added into the medicament stirring tank 2 for mixing, and finally the sulfuric acid liquid is sent out from a discharge pipe at the lower part of the medicament stirring tank 2. The outer sides of the sulfuric acid storage tank 1, the medicament stirring tank 2 and the alkali liquor storage tank 7 are provided with cofferdams with the height of at least 0.6 m. The outside is provided with a fence with a height of at least 0.6 m. The main function of the regional fence is to effectively prevent the safety accident from occurring when the sulfuric acid storage tank 1 or the medicament stirring tank 2 leaks.
The pump pool 5 for providing a power source is arranged at one side of the water storage and drainage pool 4 and is close to the pickling pool body 3; the pump pool 5 is connected with the water storage and drainage pool 4 through a pipeline. In order to keep the interior of the pump pool 5 dry, a rain shed is arranged above the pool body of the pump pool 5, and a drainage pump can be additionally arranged in the pool body. The right side of the water storage and drainage tank 4 is provided with a pickling tank body 3; a grille can be arranged between the water storage and drainage tank 4 and the immersion tank body 3. The chemical distribution pipeline 6 is arranged along the long side of one side of the pickling tank body 3, the length of the chemical distribution pipeline 6 is matched with the length of the long side of the pickling tank body 3, and the chemical distribution pipeline 6 is provided with at least four chemical inlet valves for rapidly and uniformly inputting treatment liquid. The prepared treatment liquid in the medicament stirring tank 2 is sent to a feed inlet of the water storage and drainage tank 4 through a discharge port arranged at the bottom of the medicament stirring tank 2; the discharge port of the water storage and drainage tank 4 is connected with a medicine distribution pipeline 6 through a pipeline; the treatment liquid after the garbage is immersed and washed flows back to the water storage and drainage tank 4 through the discharge port of the immersing and washing tank body 3, and is discharged through a waste liquid pipeline arranged at the bottom of the water storage and drainage tank 4.
The size of the pickling tank body 3 can be 25 multiplied by 9 multiplied by 2.25m, the thickness of the tank wall can be 0.4m, and the tank wall is internally coated with acid-proof paint. The bottom of the immersion tank body 3 is obliquely arranged, and the inclination angle can be about 2%o, namely the top surface of the bottom of the tank far away from one side of the water storage and drainage tank 4 is slightly higher than the top surface of the bottom of the tank near one side of the water storage and drainage tank 4.
The pickling process for chromium-polluted building rubbish provided by the invention can be operated in a sequencing batch manner, and the specific treatment steps are as follows:
firstly, crushing and screening construction wastes, conveying original construction waste crushed aggregates of a plurality of centimeters to tens of centimeters formed during site dismantling to a workshop, and crushing to 2-5cm;
step two, screening to remove soil mixed in the original construction waste, and reducing the load of the pickling tank body 3;
and thirdly, conveying the sieved construction waste into the pickling tank body 3, uniformly stacking, wherein the stacking height is 1.2m, and the feeding time is 4h.
Preparing a treatment liquid and performing pickling;
ferrous sulfate and sulfuric acid are mixed in the medicament stirring tank 2 to prepare a treating fluid for pickling, the treating fluid is sent into a feed inlet of the water storage and drainage tank 4 through a pipeline through a discharge port arranged at the bottom of the medicament stirring tank 2, a medicine feeding valve on a medicine distribution pipeline 6 is opened, after the treating fluid is 0.5-0.8m higher than a building rubbish stack body, the treating fluid is stopped, building rubbish is pickled in the medicament, the pH value of the building rubbish is reduced, hexavalent chromium is dissolved out and reduced, polluted building rubbish is repaired, and pickling is carried out for 12 hours;
step five, naturally flowing down the treatment liquid of the soaked garbage along the gradient of the bottom of the soaking tank body 3, and entering a water storage and drainage tank 4 through a discharge hole; recycling or discharging into a sewage treatment system, wherein the required time is 4 hours;
step six, detecting the treatment liquid in the water storage and drainage tank 4; if the standard which can be used continuously is reached, recycling the medicament, otherwise, discharging the medicament into a sewage treatment facility or other designated positions through a waste liquid pipeline arranged at the bottom of the water storage and drainage tank 4;
and seventhly, neutralizing alkali liquor, namely, opening a valve at the discharge port of an alkali liquor storage tank 7 to add the alkali liquor into the pickling tank body 3 through a medicine distribution pipeline 6 in order to ensure that the pH value of the construction waste can reach the restoration standard because the pickling treatment liquor is acidic. In order to enable the pH of the building waste to be adjusted back to be neutral from acidity by the alkali liquor, and the restoration target value is reached, the liquid level of the alkali liquor is required to be 0.5-0.8m higher than the building waste pile body, and the neutralization time of the alkali liquor is 4 hours;
step eight, emptying the alkali liquor of which the residual acid of the construction waste is neutralized;
step nine, self-checking and accepting, namely transporting out the construction waste subjected to pickling treatment from the pickling tank body 3 by using a forklift, stacking the construction waste in a cleaning temporary storage area, and taking a treated sample for checking;
and step ten, if the detection result cannot reach the restoration target, sending back into the pickling tank body 3 again, and repeating the steps four to nine.
In the idle process of the equipment or the pool body, the equipment or the pool body needs to be overhauled in time and is ready for the operation of the treatment of the construction waste in the next period.
The pickling method provided by the invention has good repairing effect on chromium-polluted building wastes, and has the advantages of short treatment period and low treatment cost.
Example 2, a chromium contaminated construction waste pickling system, is the same as example 1, except that: the rectangular pickling tank body 3 is provided with two and arranged side by side, the two medicine distribution pipelines 6 are symmetrically arranged in the pickling tank body 3, one end of each medicine distribution pipeline 6 is communicated with a discharge hole of the water storage and drainage tank 4 through a pipeline, and a power source is provided through the pump tank 5. See fig. 2.
Example 3, a chromium contaminated construction waste pickling system, which is identical to example 1 in that: the rectangular pickling tank body 3 is four and arranged in parallel. As shown in fig. 3, 4 and 5.
As shown in the above embodiments 1-3, the invention provides a chromium-polluted building rubbish pickling system and a pickling method thereof, wherein the number of pumps in a reagent stirring tank 2, an alkali liquor storage tank 7, a sulfuric acid storage tank 1 and a pump pool 5, the length of a medicine distribution pipeline 6, the pipe of a medicine feeding pipe network and the number of medicine feeding valves on the medicine distribution pipeline 6 used in the pickling system can be flexibly adjusted according to factors such as actual treatment capacity, treatment sites and the like. The reaction tanks with partial structures and similar main structures are added and reduced, and are regarded as a variation of the invention. The key of the technical scheme is that the construction waste is immersed and washed, namely, the construction waste pile is completely immersed in the medicament solution and stays for a certain time. The technology is superior to the existing treatment mode, can realize the whole process of feeding, medicine distribution, pickling, neutralization, emptying and discharging of the construction waste pickling, and has the functions of medicament circulation, real-time monitoring and adjustment.
The foregoing is merely illustrative of preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any changes or substitutions that would occur to those skilled in the art within the scope of the present invention are intended to be included in the scope of the present invention.
Claims (2)
1. A chromium pollution construction waste pickling system is characterized in that: the pickling system comprises a sulfuric acid storage tank (1), an alkali liquor storage tank (7), a medicament stirring tank (2), a water storage and drainage tank (4), a pump tank (5), a rectangular pickling tank body (3) with a rectangular section and a medicament distribution pipeline (6), wherein an acid discharge port is formed in one side of the sulfuric acid storage tank (1), a discharge port is formed in the other side of the sulfuric acid storage tank (1), and the discharge port of the sulfuric acid storage tank (1) is connected with a first feed port of the medicament stirring tank (2) through a pipeline;
the top of the medicament stirring tank (2) is also provided with a second feed inlet and a water inlet for adding ferrous sulfate;
an alkali discharge port is formed in one side of the alkali liquor storage tank (7), a discharge port is formed in the other side of the alkali liquor storage tank (7), the discharge port of the alkali liquor storage tank (7) is connected with the medicine distribution pipeline (6) through a pipeline, and a valve is further arranged between the discharge port of the alkali liquor storage tank (7) and the medicine distribution pipeline (6);
one side of the water storage and drainage tank (4) is provided with a pickling tank body (3); a medicine distribution pipeline (6) is arranged along the long side of one side of the pickling tank body (3);
the prepared treatment liquid in the medicament stirring tank (2) is sent into a feed inlet of the water storage and drainage tank (4) through a discharge port arranged at the bottom of the medicament stirring tank (2) by a pipeline; the discharge port of the water storage and drainage tank (4) is connected with a medicine distribution pipeline (6) through a pipeline;
the treatment liquid after the garbage is immersed and washed flows back to the water storage and drainage tank (4) through the discharge port of the immersing and washing tank body (3), and is discharged through a waste liquid pipeline arranged at the bottom of the water storage and drainage tank (4); the outside of the sulfuric acid storage tank (1), the medicament stirring tank (2) and the alkali liquor storage tank (7) are provided with heightsA cofferdam of at least 0.6 m; the size of the immersion tank body (3) is 25 multiplied by 9 multiplied by 2.25m, and the thickness of the tank wall is 0.4m; the bottom of the immersion tank body (3) is obliquely arranged, and the top surface of the tank bottom at one side far away from the water storage and drainage tank (4) is higher than the top surface of the tank bottom at one side close to the water storage and drainage tank (4); the length of the medicine distribution pipeline (6) is matched with the length of the long side of the pickling tank body (3); at least four medicine inlet valves are arranged on the medicine distribution pipeline (6); the pump pool (5) is arranged at one side of the water storage and drainage pool (4) and is close to the pickling pool body (3); the pump pool (5) is connected with the water storage and drainage pool (4) through a pipeline; a rain shed is arranged at the top of the pump pool (5); the capacity of the medicament stirring tank (2) is 8-12m 3 The method comprises the steps of carrying out a first treatment on the surface of the The material of the medicament stirring tank (2) is steel lining plastic.
2. The pickling method of the chromium-contaminated construction waste pickling system according to claim 1, comprising the following specific steps:
firstly, crushing and screening construction wastes, conveying original construction waste crushed aggregates of a plurality of centimeters to tens of centimeters formed during site dismantling to a workshop, and crushing to 2-5cm;
step two, screening to remove soil mixed in the original construction waste;
step three, conveying the sieved construction waste into a pickling tank body (3) and uniformly stacking, wherein the stacking height is 1.2m;
preparing a treatment liquid and performing pickling;
ferrous sulfate and sulfuric acid are mixed in a medicament stirring tank (2) to prepare a treating fluid for pickling, the treating fluid is sent into a feed inlet of a water storage and drainage tank (4) through a pipeline through a discharge port arranged at the bottom of the medicament stirring tank (2), a medicine feeding valve on a medicine distribution pipeline (6) is opened, and after the treating fluid is 0.5-0.8m higher than a building rubbish pile body, the treating fluid is stopped to be subjected to pickling for 12 hours;
fifthly, flowing the treatment liquid after pickling the garbage into a water storage and drainage tank (4) through a discharge hole of a pickling tank body (3);
step six, detecting the treatment liquid in the water storage and drainage tank (4); if the standard of continuous use is reached, recycling the medicament, otherwise, discharging the medicament into a sewage treatment facility through a waste liquid pipeline arranged at the bottom of the water storage and drainage tank (4);
step seven, alkali liquor neutralization, wherein the alkali liquor liquid level is required to be 0.5-0.8m higher than the building rubbish pile body, and the alkali liquor neutralization time is 4 hours, because the pickling treatment liquor is acidic, so that the pH value of the building rubbish can reach the restoration standard, a valve at the discharge port of an alkali liquor storage tank (7) is opened, and alkali liquor is added into the pickling tank body (3) through a medicine distribution pipeline (6);
step eight, emptying the alkali liquor of which the residual acid of the construction waste is neutralized;
step nine, self-checking and accepting, namely transporting out the construction waste subjected to pickling treatment from a pickling tank body (3) by using a forklift, stacking the construction waste in a cleaning temporary storage area, and taking a treated sample for checking;
and step ten, if the detection result cannot reach the restoration target, the detection result is sent back into the immersion tank body (3) again, and the steps four to nine are repeated.
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| CN209035100U (en) * | 2018-11-05 | 2019-06-28 | 北京建工环境修复股份有限公司 | A kind of pollution of chromium building waste immersion systems |
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