Semi-solid hazardous waste pretreatment system

Abstract

The present invention provides a pretreatment system for semi-solid hazardous waste in the field of hazardous waste treatment, comprising a pre-sorting mechanism, a temporary storage mechanism, and a mixing mechanism connected in sequence, and also comprising an impurity recovery mechanism connected to the pre-sorting mechanism and the mixing mechanism; the pre-sorting mechanism comprises a feeding trough, a chain crusher, a sorting trough, a vibrating screen, and an intermediate trough for sorting finished products connected in sequence. The present invention can solve the problem that the existing technology cannot fully and effectively realize the sorting, compatibility control, crushing, screening, and fluidity improvement of semi-solid hazardous waste raw materials in the process of semi-solid hazardous waste treatment, resulting in poor treatment effect on semi-solid hazardous waste and low treatment and reuse rate of hazardous waste.

Description

Technical Field

[0001] The present invention relates to the field of hazardous waste treatment and reuse, and in particular to a pretreatment system for semi-solid hazardous waste. Background Art

[0002] With the development of industry, the amount of hazardous waste discharged from industrial production processes is increasing. It is estimated that 330 million tons of hazardous waste are generated worldwide each year. Hazardous waste has the characteristics of corrosiveness, reactivity, flammability, toxicity, and infectivity. Due to the serious pollution and potential serious impact caused by hazardous waste, the treatment of hazardous waste is becoming increasingly important. Hazardous waste is usually divided into three types: solid, semi-solid and liquid for treatment. Semi-solid hazardous waste is mainly sludge, but sludge includes many types, such as oily sludge, oil-based drilling cuttings, sulfur-containing sludge, heavy metal sludge, etc., and the temporary storage methods of hazardous waste by waste-producing units are also uneven. Some companies directly pack various wastes together to let them settle naturally, and then drain the water. The composition of the sludge left is very complex, and even includes impurities such as stones, beverage bottles, and packaging bags. At present, in the existing semi-solid hazardous waste treatment technology in my country, due to the imperfection of the process and related equipment solutions, the complexity and harmfulness of the raw material form at the waste production end are not fully considered, and the semi-solid hazardous waste raw materials cannot be fully and effectively sorted, controlled, crushed, screened, and improved in fluidity. The more efficient hazardous waste treatment is to combine with cement kilns for coordinated treatment, and send hazardous waste into cement kilns to replace fuel or raw materials to a certain extent. The existing technology does not classify hazardous waste sufficiently, resulting in poor treatment of semi-solid hazardous waste. The quality indicators of hazardous elements, calorific value, moisture, particle size, viscosity, pH value, flash point, etc. of hazardous waste entering the kiln do not meet the requirements of cement kiln coordinated treatment, which will have a certain negative impact on cement production, increase the difficulty and intensity of cement kiln operation, and the treatment and reuse rate of hazardous waste is low. Summary of the invention

[0003] The technical problem to be solved by the present invention is that the existing technology cannot fully and effectively realize the sorting, compatibility control, crushing, screening and fluidity improvement of semi-solid hazardous waste raw materials during the treatment process of semi-solid hazardous waste, resulting in poor treatment effect of semi-solid hazardous waste and low treatment and reuse rate of hazardous waste.

[0004] In order to solve the above technical problems, the present technical solution provides a pretreatment system for semi-solid hazardous waste, including a pre-sorting mechanism, a temporary storage mechanism, and a mixing mechanism connected in sequence, and also includes an impurity recovery mechanism connected to the pre-sorting mechanism and the mixing mechanism; the pre-sorting mechanism includes a feeding trough, a chain crusher, a sorting trough, a vibrating screen and an intermediate trough for sorting finished products connected in sequence.

[0005] By adopting the above technical scheme, the semi-solid hazardous waste is pre-sorted by a pre-sorting mechanism, the compacted sludge is crushed by a chain crusher to expose impurities, and further sorting is carried out by a sorting tank to select larger sludge blocks and impurities, and then further screening is carried out by a vibrating screen to separate impurities of different mass sizes. In this way, various impurities are separated through multi-layer screening to obtain semi-solid hazardous waste products with uniform particle size. After the sorted finished products are centrally packaged in the intermediate tank, they are sent to a temporary storage mechanism for unified storage for subsequent use. The screened semi-solid hazardous waste is mixed with other products by a mixing mechanism, and the impurities are separated again and homogenized to obtain a product with uniform texture that can be suitable for reuse, thereby achieving effective sorting and treatment of semi-solid hazardous waste and improving the reuse rate of semi-solid hazardous waste to a certain extent.

[0006] Furthermore, screw conveyors are provided between the chain crusher and the sorting trough, between the sorting trough and the vibrating screen, and between the vibrating screen and the intermediate trough for sorting finished products.

[0007] By adopting the above technical solution, semi-solid hazardous waste can be effectively transported by the screw conveyor, and hazardous waste raw materials can be mixed.

[0008] Furthermore, the mixing mechanism includes a turning machine, a mixing intermediate tank, a mixer, a mixing vibrating screen, a mixing iron remover, and a vibrating feeder which are connected in sequence.

[0009] By adopting the above technical scheme, it is possible to complete the processes of dumping, mixing, vibrating screening, and re-removing iron and impurities for the initially sorted hazardous waste raw materials, and to further homogenize the pre-sorted hazardous waste raw materials, so that the treated hazardous waste raw materials have a uniform texture and better recycling effect.

[0010] Furthermore, the turnover machine is connected to an empty box conveying and cleaning mechanism.

[0011] By adopting the above technical solution, the empty material box after dumping hazardous waste raw materials can be cleaned and recycled efficiently and conveniently.

[0012] Furthermore, it also includes a waste liquid input mechanism, which is connected to a waste liquid pipeline, and the pre-sorting mechanism, the mixing mechanism, and the waste liquid input mechanism are all connected to a waste gas pipeline.

[0013] By adopting the above technical scheme, various types of waste liquids obtained from liquid hazardous waste treatment can be used for the treatment of semi-solid hazardous waste, making full use of liquid hazardous waste and improving the efficiency of hazardous waste treatment. The waste gas pipeline is used to discharge the waste gas generated during pre-sorting, mixing, waste liquid input, etc., which is convenient for centralized treatment of waste gas and can also improve the environment of hazardous waste treatment sites.

[0014] Furthermore, the mixing intermediate tank and the mixer are both connected to the waste liquid pipeline.

[0015] By adopting the above technical scheme, the waste liquid product obtained from the treatment of liquid hazardous waste can be used for the homogenization treatment of semi-solid hazardous waste, so that the semi-solid hazardous waste and liquid hazardous waste are fully mixed and reacted, thereby improving the treatment efficiency of semi-solid hazardous waste.

[0016] Furthermore, screw conveyors are connected between the mixing intermediate tank and the mixer, and between the mixer and the mixing vibration screen.

[0017] By adopting the above technical solution, the hazardous waste products after mixing can be effectively transported without problems such as leakage and backflow.

[0018] Furthermore, the front ends of the chain crusher and the sorting trough are connected with screens, and the screen, vibrating screen, mixing vibrating screen and mixing iron remover are all connected with the impurity recovery mechanism.

[0019] By adopting the above technical solution, the impurities separated and screened out in each link can be recovered and stored separately, which is convenient for further separate treatment and also convenient for combination processing into reusable resources.

[0020] Furthermore, the temporary storage mechanism is a three-dimensional warehouse, and a weighing scale is provided between the intermediate trough for sorting finished products and the three-dimensional warehouse.

[0021] By adopting the above technical solution, the three-dimensional warehouse adopts an intelligent three-dimensional warehouse, which is convenient for centralized storage of hazardous waste products. The weighing scale can accurately measure and store the products entering the warehouse, which is convenient for the management and matching use of various products.

[0022] Furthermore, a weighing scale is also provided at the entrance of the impurity recovery mechanism.

[0023] The above technical solution can be used to accurately measure and recycle various types of hazardous waste products that are screened and recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a flow chart of Embodiment 1 of the present invention;

[0025] Figure 2 It is a front view of the mixing mechanism in Example 1 of the present invention;

[0026] Figure 3 This is the front view of the pre-sorting mechanism in Example 1 of the present invention. DETAILED DESCRIPTION

[0027] The following is further described in detail through specific implementation methods:

[0028] The figure marks in the drawings of the specification include: turning machine 1, screw conveyor 2, mixer 3, mixing vibrating screen 4, vibrating feeder 5, roller conveyor 6, mixing intermediate trough 7, iron remover 8, screw pump 9, feeding trough 10, chain crusher 11, sorting trough 12, vibrating screen 13, sorting finished product intermediate trough 14, storage tank 15, and waste liquid storage tank 16.

[0029] The embodiment is basically as shown in the attached Figure 1 As shown: A semi-solid hazardous waste pretreatment system includes a pre-sorting mechanism, a temporary storage mechanism, a mixer and a waste liquid input mechanism connected in sequence, and also includes an impurity recovery mechanism connected to the pre-sorting mechanism and the mixer. The temporary storage mechanism is an intelligent three-dimensional warehouse.

[0030] Combination Figure 3 As shown, the pre-sorting mechanism includes a feeding trough 10, a chain crusher 11, a sorting trough 12, a vibrating screen 13 and a sorting finished product intermediate trough 14 connected in sequence. A screw conveyor 2 is provided between the chain crusher 11 and the sorting trough 12, between the sorting trough 12 and the vibrating screen 13, and between the vibrating screen 13 and the sorting finished product intermediate trough 14. The inlet of the feeding trough 10 is provided with a screen with an aperture of 100 mm, the outlet of the feeding trough 10 is connected to the inlet of the chain crusher 11, the opening of the sorting trough 12 is provided with a screen with an aperture of 50 mm, and the screen aperture of the vibrating screen 13 is also 50 mm. A weighing scale is provided between the sorting finished product intermediate trough 14 and the three-dimensional warehouse, and a roller conveyor 6 and a hoisting hoist are provided between the weighing scale and the three-dimensional warehouse.

[0031] Combination Figure 2 As shown, the mixer 3 includes a tilting machine 1, a mixing intermediate tank 7, a mixer 3, a mixing vibrating screen 4, a mixing iron remover 8, and a vibrating feeder connected in sequence. A roller conveyor 6 is provided between the three-dimensional warehouse and the tilting machine 1, and a conveying path and a lifting hoist for conveying empty boxes to the cleaning station are connected to the outside of the tilting machine 1. The waste liquid input mechanism is a waste liquid storage tank 16, and there are multiple waste liquid storage tanks 16. Different types of waste liquid are stored in different waste liquid storage tanks 16. The waste liquid storage tank 16 is connected to a waste liquid pipeline, and the mixing intermediate tank 7 and the mixer 3 are connected to the waste liquid pipeline through a control valve. A screw conveyor 2 is connected between the mixing intermediate tank 7 and the mixer 3, and between the mixer 3 and the mixing vibrating screen 4. The mesh aperture of the mixing vibrating screen 4 is 20 mm. The output end of the vibrating feeder 5 is connected to a storage tank 15 through a screw pump 9, and the output end of the storage tank 15 is also connected to a screw pump 9.

[0032] The pre-sorting mechanism, the mixing mechanism and the waste liquid input mechanism are all connected with the waste gas pipeline.

[0033] The screen, the vibrating screen 13, the mixing vibrating screen 4 and the mixing iron remover 8 are all connected to the impurity recovery mechanism. A weighing scale is also provided at the entrance of the impurity recovery mechanism.

[0034] In this embodiment, there are two sets of mixers 3 , and the output end of each vibrating feeder 5 of each set of mixers 3 is connected to two storage tanks 15 .

[0035] The specific implementation process is as follows: Semi-solid hazardous wastes include various types of industrial sludge, distillation residues, ink residues, paint residues, oil-based drilling cuttings, film-coated residues, etc. Liquid hazardous wastes mainly include waste organic solvents, oily wastewater, waste acid, waste alkali, etc. After being collected from waste-producing units, various types of semi-solid hazardous wastes are packed in standard containers and then transported to the pre-treatment center by vehicles. After unloading at the pre-treatment center, the waste is weighed and then poured into the feeding trough 10. The mixed packaging and lumps with a volume exceeding 100 mm are screened out at the screen at the entrance of the feeding trough 10. The screened waste enters the chain crusher 11 through the feeding trough 10. The chain crusher 11 crushes the hazardous waste entering the chain crusher. The crushed hazardous waste is discharged from the chain crusher 11 to the screw conveyor 2. The remaining hazardous waste after the compacted hazardous waste is removed from the container is also conveyed to the screw conveyor 2. The screw conveyor 2 transports the hazardous waste to the sorting trough 12. The lumps with a volume exceeding 50 mm are screened out by gravity at the screen in front of the sorting trough 12. The screened hazardous waste is transported to the vibrating screen 13 by the screw conveyor 2. The vibrating screen 13 screens the hazardous waste again to ensure that the particle size of the screened hazardous waste is less than 50 mm. The screened hazardous waste is transported to the intermediate trough 14 for sorting finished products by the screw conveyor 2. The hazardous waste in the intermediate tank 14 of the sorted finished product is discharged into a container of standard capacity through a control valve. The hazardous waste contained in the container is packaged after being measured by a weighing scale, and then transported to an intelligent three-dimensional warehouse for storage by a roller conveyor 6 and a hoisting hoist.

[0036] The hazardous waste that has been pre-sorted and temporarily stored in the intelligent stereoscopic warehouse is used for coordinated disposal in the cement kiln after mixing and matching. During the mixing and matching process, the semi-solid hazardous waste and liquid hazardous waste in the intelligent stereoscopic warehouse are fully mixed according to a specific matching scheme by using the mixer 3, and the hard and soft block impurities and metals in the material are sorted and removed again, and finally the various physical and chemical indicators entering the cement kiln are achieved. During the mixing and matching process, the semi-solid hazardous waste with a particle size of less than 50 mm contained in the container is transported to the turning machine 1 by the hoisting hoist and the roller conveyor 6. The turning machine 1 turns the container and dumps the contained semi-solid hazardous waste into the mixing middle tank 7. The empty container after dumping is transported to the empty box and empty barrel cleaning operation area by the roller conveyor 6 and the hoisting hoist. According to the matching scheme, the waste liquid in the waste liquid storage tank 16 is added to the mixing intermediate tank 7 through the waste liquid pipeline and the control valve. After reaching the set amount under the control of the control system, the feeding is stopped, and then the set amount of other types of waste liquid is added in the same steps for preliminary mixing, so that the liquid content, viscosity, pH value and form of the hazardous waste are preliminarily adjusted. The hazardous waste in the mixing intermediate tank 7 is transported to the mixer 3 through the screw conveyor 2 after preliminary conditioning. In the mixer 3, according to the matching scheme, the waste liquid in different waste liquid storage tanks 16 is sent to the mixer 3 through the waste liquid pipeline and the control valve. The semi-solid hazardous waste and liquid hazardous waste mixed in the mixer 3 are mixed and stirred, so that the liquid content, viscosity, pH value, form and particle size of the mixed hazardous waste are further improved to meet the standards for entering the cement kiln. After mixing and matching, the hazardous waste is in a homogeneous slurry state, has good fluidity, and has a balanced calorific value. The semi-solid product after mixing and matching is transported to the mixing vibration screen 4 by the screw conveyor 2. After screening by the mixing vibration screen 4, impurities with a particle size greater than 20 mm are screened out. The screened product is transported to the vibrating feeder 5. During the transportation process, it is treated by the iron remover 8 to remove the metal contained in the product. The product without impurities and metals enters the screw pump 9 from the vibrating feeder 5, and enters the storage tank 15 for storage under the pumping of the screw pump 9. When used later, it is extracted from the storage tank 15 and transported to the cement kiln for use.

[0037] The impurities, lumps, metals, etc. separated in the feeding trough 10, sorting trough 12, vibrating screen 13, mixing vibrating screen 4 and iron remover 8 are respectively packed in standard containers and transported to the warehouse by forklift for classified storage, so as to facilitate further classification and processing.

[0038] Waste gases such as HCl, SO2, hydrogen sulfide, ammonia, VOC, and acidic gases generated during the pre-sorting, mixing, and waste liquid input processes are discharged through waste gas pipes and further treated harmlessly by alkali washing towers, activated carbon, dust collectors, etc. before being discharged.

[0039] The quality indicators of the semi-solid hazardous waste after the above treatment, such as harmful element content, calorific value, moisture, particle size, viscosity, pH value, flash point, etc., meet the requirements for cement kiln coordinated disposal. It can be well applied to cement kiln coordinated disposal to realize the resource recycling of hazardous waste.

Claims

1. A pretreatment system for semi-solid hazardous waste, characterized by: It includes a pre-sorting mechanism, a temporary storage mechanism, and a mixing mechanism connected in sequence, and also includes an impurity recovery mechanism connected to the pre-sorting mechanism and the mixing mechanism; it also includes a waste liquid input mechanism, the waste liquid input mechanism is a waste liquid storage tank, there are multiple waste liquid storage tanks, different types of waste liquid are stored in different waste liquid storage tanks, the waste liquid input mechanism is connected with a waste liquid pipeline, and the pre-sorting mechanism, the mixing mechanism, and the waste liquid input mechanism are all connected with an exhaust gas pipeline; the pre-sorting mechanism includes a feeding trough, a chain crusher, A sorting trough, a vibrating screen and an intermediate trough for sorting finished products; the mixing mechanism includes a turning machine, a mixing intermediate trough, a mixer, a mixing vibrating screen, a mixing iron remover and a vibrating feeder connected in sequence, the mesh aperture of the mixing vibrating screen is 20 mm, the mixing intermediate trough and the mixer are both connected to the waste liquid pipeline through a control valve, and the waste liquid in the waste liquid storage tank is added to the mixing intermediate trough through the waste liquid pipeline and the control valve, and a screw conveyor is connected between the mixing intermediate trough and the mixer, and between the mixer and the mixing vibrating screen.

2. The semi-solid hazardous waste pretreatment system according to claim 1, characterized in that: Screw conveyors are arranged between the chain crusher and the sorting trough, between the sorting trough and the vibrating screen, and between the vibrating screen and the intermediate trough for sorting finished products.

3. The semi-solid hazardous waste pretreatment system according to claim 2, characterized in that: The overturning machine is connected with an empty box conveying and cleaning mechanism.

4. The semi-solid hazardous waste pretreatment system according to claim 3, characterized in that: The front ends of the chain crusher and the sorting trough are both connected with a screen, the aperture of the screen is 100 mm, and the screen, vibrating screen, mixing vibrating screen, and mixing iron remover are all connected with the impurity recovery mechanism.

5. The semi-solid hazardous waste pretreatment system according to claim 4, characterized in that: The temporary storage mechanism is a three-dimensional warehouse, and a weighing scale is arranged between the intermediate slot for sorting finished products and the three-dimensional warehouse.

6. The semi-solid hazardous waste pretreatment system according to claim 5, characterized in that: A weighing scale is also provided at the entrance of the impurity recovery mechanism.

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