Pretreatment cabin based on intelligent washing and separation of solid waste and application method

Abstract

The invention discloses an intelligent washing and separating pretreatment cabin based on solid waste and an application method, and relates to a washing integrated device and method for resource utilization of salt-containing solid waste. The solid waste cleaning device and method are high in integration level, good in desalting solid weight effect, low in cost and intelligent. The intelligent washing and separating pretreatment cabin based on the solid waste comprises a first box body and a second box body, the first box body is arranged on the lower portion of the second box body, the interior of the first box body and the interior of the second box body are each of a modular structure, a first reactor is arranged in the first box body, and a feeding port of the first reactor is connected with a conveyor through a beater; a powder bin, a filter press and a plurality of filtrate pools are arranged in the second box body, the powder bin is arranged at the upper part of the first reactor and is vertically connected with a feed port of the first reactor, the conveyor is arranged below the filter press in the vertical direction, and feed liquid in the filtrate pools enters the first reactor.

Description

Technical Field

[0001] The present invention relates to the field of resource utilization of salt-containing solid waste, and in particular to a pretreatment chamber and method based on intelligent washing and separation of solid waste. Background Art

[0002] The solid waste problem is a serious challenge facing the world today, especially in the context of rapid urbanization and industrialization, the amount and types of waste generated are increasing. These wastes not only pose a potential threat to human health and the environment, but also lead to waste of resources and damage to ecosystems. Especially in developing countries, poor waste management often leads to water and soil pollution, exacerbating environmental inequality and socio-economic instability.

[0003] With the rapid development of the economy, the amount of solid waste generated has increased dramatically. How to effectively utilize these solid wastes has become a serious problem facing us. At present, the solid waste resource utilization industry has made certain progress in both technology and market, but there are still many problems that restrict the development of the solid waste resource utilization industry. Therefore, under the guidance of the "dual carbon" goal, it is particularly important to study the development strategy of the solid waste resource utilization industry. It is not only necessary to achieve the "dual carbon" goal, but also a necessary condition for promoting industrial transformation and upgrading and achieving sustainable development. It has important theoretical and practical significance for promoting the healthy development of the solid waste resource utilization industry. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a solid waste intelligent washing and separation pretreatment chamber and an application method with high integration level, good desalination and solid weight effect and low cost.

[0005] One of the technical solutions provided by the present invention is a pretreatment chamber based on intelligent washing and separation of solid waste, including a first box body and a second box body. The first box body and the second box body are both modular structures, and the modules can be disassembled and assembled through connecting parts to achieve the purpose of flexible assembly according to actual needs.

[0006] The first tank, the sixth tank, the second reactor, the second tank and the membrane assembly are arranged on the left side of the first box, wherein the second tank may contain one or more of sodium carbonate, potassium sulfate, sodium hydroxide and potassium hydroxide; the third tank and the first reactor are arranged in the middle, the feed inlet of the first reactor is connected to the conveyor through a scatterer, and the conveyor is fixedly connected to the top of the first box; the fourth tank, the fifth tank and the power distribution room are arranged on the right side. Each module in the first box is detachably fixedly connected to the first box.

[0007] Inside the first box, the first storage tank is used to store hydrochloric acid to ensure safety and prevent leakage; the sixth storage tank is used to configure heavy metal capture fixatives; the second reactor is used to further reduce the calcium and magnesium content of the feed liquid; the membrane assembly can first remove the colloidal particles in the feed liquid by ultrafiltration, and then separate the salt by nanofiltration; the third storage tank is used to temporarily store the feed liquid produced by the filter press; the fourth storage tank is used to store the purified feed liquid; the fifth storage tank is used to store condensed water; the first reactor can play a composite role of mixing, dissolving, and solidifying; the disperser breaks up the filter cake to make it easier to dissolve and separate the soluble matter in the re-slurry process, which is beneficial to reduce the salt content in the filter residue; the conveyor is used to transport the process and the final desalination solid waste.

[0008] The second box body is provided with an exhaust gas purifier, a third reactor, a fourth reactor, a seventh storage tank and several filtrate pools on the left side; a powder bin is provided in the middle, which is connected to the discharge port of the dust collector, and a leg is provided at the bottom of the powder bin, which is fixedly connected to the base of the second box body; a filter press is provided on the right side, and the bottom of the filter press is fixedly connected to the base of the second box body. Each module in the second box body is detachably fixedly connected to the second box body.

[0009] Inside the second box, the exhaust gas purifier is used for collecting and purifying the exhaust gas; the third reactor is used to adjust the pH value of the feed liquid; the fourth reactor is used to remove heavy metal ions in the feed liquid; several filtrate tanks are used to store the feed liquid generated during the intelligent washing process; the seventh storage tank is used to store the newly added water; the powder silo is used to store the powder, and the hardness remover can be sodium sulfate or potassium sulfate; the dust collector is used to treat the dusty gas generated by the powder silo; the filter press is used for solid-liquid separation and filtration during the intelligent washing process. The filter press can be replaced by a screw stack, a screw press dehydrator, a centrifuge and other solid-liquid separation facilities.

[0010] The first box is arranged at the lower part of the second box and is fixedly connected to the second box. The powder silo is arranged at the upper part of the first reactor, and the discharge port of the powder silo is vertically connected to the feed port of the first reactor, and the conveyor is arranged below the filter press in the vertical direction. This design enables the liquid in the filtrate pool of the second box to flow into the first reactor by gravity during the elution process, thereby replacing the pump transfer, which not only saves investment and operating costs, but also facilitates emptying to avoid equipment blockage.

[0011] Inside the first box and the second box, the outlet of the filter press is connected to the membrane assembly, the filter press is also connected to the third tank and the membrane assembly respectively, the third tank is connected to several filtrate pools, the outlet of the first filtrate pool among the several filtrate pools is connected to the second tank, and the fifth tank is connected to the first reactor. The sixth tank and the second tank are respectively connected to the fourth reactor, the outlet of the fourth reactor is connected to the filter press, the outlet of the filter press and the first tank are respectively connected to the third reactor, the outlet of the third reactor is connected to the fourth tank, and the exhaust gas purifier is respectively connected to the first reactor, several filtrate pools, the third reactor and the first tank.

[0012] Another technical solution provided by the present invention is an application method based on a solid waste intelligent washing and separation pretreatment chamber, which is based on the above-mentioned pretreatment chamber for solid waste intelligent washing and separation, comprising the following steps:

[0013] Step 1: Solid waste, hardness remover, heavy metal fixing agent, dispersant and process water are respectively transported to the first reactor in a mass ratio of 1: (0-0.1): (0-0.005): (0-0.003): (1.5-3), stirred in the first reactor for 5-20 minutes, preferably 10 minutes, and then transported to a filter press for solid-liquid separation to obtain a first filter residue and a first feed liquid, and the first feed liquid enters the alkali B feed liquid tank through the third storage tank.

[0014] Furthermore, in step 1, the powder silo adopts negative pressure conveying, and the amount of waste gas generated is 1000-2000m less than that of positive pressure conveying. 3 / h, which can greatly reduce the amount of waste gas treatment.

[0015] Furthermore, in step 1, the heavy metal fixing agent is one or more of inorganic sulfides, chelating agents, auxiliary agents, and oxidative decolorizing agents, which utilize their synergistic ability with heavy metal ions to, on the one hand, react chemically with the heavy metals in the feed solution to generate insoluble substances, thereby efficiently fixing the heavy metals in the feed solution; on the other hand, decolorize the colored ions in the feed solution to ensure the quality of the back-end crystalline salt.

[0016] Furthermore, in step 1, the dispersant can be one or a combination of filler particles and hydrophobic surfactants, which, on the one hand, facilitates the breaking up and re-solid-liquid mixing to dissolve soluble salts, and on the other hand, improves the solid-liquid separation effect, increases the desalination rate by 5-10%, reduces the filter cake moisture by 1-5%, and ensures the quality of the recycled material.

[0017] Furthermore, in step 1, the boiler flue gas containing carbon dioxide and nitrogen oxides after dust removal and desulfurization is fed into the second reactor and adjusted to a pH value of 9-10. An air distribution device is installed at the bottom of the second reactor to allow the flue gas to be evenly aerated and fully mixed with the feed liquid to react and produce sodium carbonate (CaCO3), magnesium carbonate (Mg2CO3) and calcium sulfate (CaSO4) to reduce the hardness of the feed liquid.

[0018] Step 2: After the first feed liquid in step 1 is treated in the second reactor and the fourth reactor, it is pumped into a filter press for filtration to obtain a softened feed liquid.

[0019] Furthermore, the stage of pumping to the filter press in step 2 is filtering in the filter press that has completed the loading in step 1 but has not yet been squeezed and unloaded, except for the initial startup. In this way, the solid content of the softened feed liquid can be guaranteed to be less than 30 mg / l, and the carbonate ion is less than 80 mg / l, which are much lower than the solid content and carbonate content of the feed liquid after filtering with a filter plate frame without filter material under the same conditions. This is because the filter residue plays the role of a filter layer, and at the same time, the calcium ions in the filter residue combine with the carbonate ion, reducing the solid content and carbonate ion in the feed liquid, while improving the utilization efficiency of the alkali B, which is conducive to the stability of the subsequent nanofiltration operation and reducing the cost of the reagent.

[0020] Step 3, the softened liquid obtained in step 2 is passed through the third reactor to adjust the pH value and the membrane component to ensure that the divalent ion content of the produced water is no more than 5%, and the concentrated water is returned to the first reactor.

[0021] Furthermore, the stage of feeding the concentrated water in step 3 into the first reactor is after the first reactor in step 1 has been stirred for no less than 5 minutes, so that the unreacted reagent in the concentrated water participates in the reaction in the first reactor, ensuring the reaction time of the concentrated water and the slurry in the first reactor, allowing the sulfate in the concentrated water to combine with the calcium and magnesium ions in the slurry, thereby improving the utilization rate of sulfate and carbonate in the concentrated water, and helping to reduce the reagent cost.

[0022] Furthermore, in combination with another technical solution of the present invention, multi-stage desalting and intelligent washing are carried out in step 1, and the first filter residue enters the first reactor after passing through a conveyor and a disperser, and the third feed liquid is transported to the first reactor; after stirring in the first reactor for 5-20 minutes, it is transported to a filter press for solid-liquid separation to obtain a second filter residue and a second feed liquid, and the second feed liquid enters a second filtrate tank through a third storage tank to complete a smart washing process; multi-stage desalting and intelligent washing are carried out in combination with the soluble salt content of the solid waste to obtain a recycled material with a soluble salt content of less than 1%, and the feed liquid is utilized in countercurrent.

[0023] Further, in combination with another technical solution of the present invention, in step 1, multiple concentration and intelligent washing are carried out, the first feed liquid enters the first reactor through the third storage tank, and the solid waste, hardness remover, heavy metal fixing agent, and dispersant are respectively transported to the first reactor in proportion; after stirring in the first reactor for 5-20 minutes, it is transported to the filter press for solid-liquid separation to obtain a second filter residue and a second feed liquid, and the second feed liquid enters the third storage tank to complete a smart washing process; the feed liquid is concentrated and intelligently washed multiple times based on the soluble salt content of the solid waste to obtain recycled material, and the salt content of the concentrated feed liquid is 20-30%, which enters the second reactor through the third storage tank, significantly reducing the subsequent processing volume and processing cost.

[0024] The present invention is based on the solid waste intelligent washing and separation pretreatment chamber and method. The difference from the prior art is that only one elution and separation device is used to realize the multi-stage water washing and desalination of solid waste, as well as the filtering treatment of solid impurities in the feed liquid, which significantly reduces the equipment space and investment of the whole system. In the purification of feed liquid, the water washing and water treatment processes are organically combined, and the filter residue is repeatedly broken up, mixed and pulped, and solid-liquid separation is used to remove soluble salts, that is, the feed liquid generated by the secondary elution is mixed with the original ash for pulping, and then solid-liquid separation is performed to obtain a primary filter residue and a primary feed liquid; the feed liquid generated by the tertiary elution is first mixed with the secondary filter residue after being broken up for pulping, and then solid-liquid separation is performed to obtain a secondary filter residue and a secondary feed liquid. The calcium and magnesium ions in the slurry are used to remove sulfate in the nanofiltration concentrated water, and the calcium and magnesium ions in the filter residue are used to remove the residual carbonate in the softened water, thereby improving the utilization rate of the reagent, reducing the consumption of the reagent, and at the same time reducing the sulfate and carbonate entering the feed liquid evaporation section, thereby improving the quality of the crystallized salt and the stability of the evaporation section. By adding heavy metal fixing agents in the first reactor, the dissolution rate of heavy metals is reduced, thereby reducing the amount of heavy metal sludge produced by liquid purification and reducing the disposal cost of heavy metal sludge. At the same time, by adding dispersants in the first reactor, the rapid dispersion of the filter residue and the secondary mixing pulping effect are improved, thereby improving the removal rate of the elution process.

[0025] Part of the material in the device is transferred by gravity, replacing the pump transfer, eliminating the transfer pump, thereby saving investment and operating costs, and is also conducive to emptying the equipment to avoid blockage.

[0026] Compared with the prior art, the present invention has the following technical effects:

[0027] The solid waste intelligent washing and separation pretreatment cabin and method of the present invention can realize the integration of the solid waste washing and purification system, make it intelligent and mobile, easy to transport and assemble, and realize productization; based on a modular assemblable box system, through modular design, flexible assembly according to the actual site is realized, greatly improving the space utilization efficiency; significantly reducing the number of equipment, the separation equipment is reduced from seven to one, and other auxiliary equipment is reduced accordingly, significantly reducing the equipment footprint and investment, reducing equipment operation and saving 20-50 degrees of electricity consumption; tons of fly ash / kiln ash washing and purification process, reducing the consumption of reagents by 1-5%; through The installation of a disintegration device and the addition of dispersants and heavy metal fixatives have improved the elution and desalination effect of the integrated equipment by 5-10%, reduced the solid content of the slurry by 20-70 mg / l, and reduced the amount of heavy metal sludge by 40-70%; by introducing boiler flue gas into the slurry, the carbon dioxide in the flue gas is effectively utilized, further improving the removal efficiency of heavy metals in the slurry while reducing the use of heavy metal removal agents, softening agents and pH neutralizing agents by 40%; for some fly ash caused by spraying garbage seepage liquid, which results in colored slurry, heavy metal fixatives are added to fix heavy metals and decolorize the slurry to ensure the quality of the back-end crystalline salt products.

[0028] The solid waste intelligent washing and separation pretreatment chamber and method of the present invention are further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of a pretreatment chamber based on intelligent washing and separation of solid waste according to the present invention;

[0030] Figure 2 It is a top view of the first box in the solid waste intelligent washing and separation pretreatment chamber of the present invention;

[0031] Figure 3 It is a top view of the second box in the solid waste intelligent washing and separation pretreatment chamber of the present invention;

[0032] Figure 4 This is a process flow chart of the application method of the solid waste intelligent washing and separation pretreatment chamber of the present invention;

[0033] The markings in the figure are as follows: 1-dust collector; 2-powder silo; 3-filter press; 4-conveyor; 5-disperser; 6-first reactor; 7-first storage tank; 8-second reactor; 9-second storage tank; 10-third storage tank; 11-fourth storage tank; 12-fifth storage tank; 13-distribution room; 14-membrane assembly; 15-sixth storage tank; 16-exhaust gas purifier; 17-third reactor; 18-fourth reactor; 19-seventh storage tank; 20-filtrate tank; 31-second box; 32-first box. DETAILED DESCRIPTION

[0034] The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0035] Example 1

[0036] This embodiment takes the treatment of solid waste with a salt content of 30% as an example and adopts a three-level intelligent washing method. Figure 1-Figure 3 As shown, the solid waste intelligent washing and separation pretreatment chamber of the present invention includes a first box body 32 and a second box body 31, and the overall size of the device is 14m×3m×6m.

[0037] The first tank 7, the sixth tank 15, the second reactor 8 and the membrane assembly 14 are arranged on the left side of the first box 32; the third tank 10 and the first reactor 6 are arranged in the middle, the upper part of the first reactor 6 is connected to the conveyor 4 through the feed inlet breaker 5, and the conveyor 4 is fixedly connected to the top of the first box 32; the fourth tank 11, the fifth tank 12 and the power distribution room 13 are arranged on the right side. Each module in the first box 32 is detachably fixedly connected to the first box 32.

[0038] The second box 31 is provided with an exhaust gas purifier 16, a third reactor 17, a fourth reactor 18, a seventh storage tank 19 and three filtrate pools 20 on the left side; a powder bin 2 is provided in the middle, and the powder is transported to the powder bin 2 by negative pressure. The powder bin 2 is connected to the discharge port of the dust collector 1, and the lower part of the powder bin 2 is provided with a support leg, which is fixedly connected to the base of the second box 31; a filter press 3 is provided on the right side, and the bottom of the filter press 3 is fixedly connected to the base of the second box 31. Each module in the second box 31 is detachably fixedly connected to the second box 31.

[0039] The first box body 32 is arranged at the lower part of the second box body 31 and is fixedly connected to the second box body 31. The powder silo 2 is arranged at the upper part of the first reactor 6, and the discharge port of the powder silo 2 is vertically connected to the feed port of the first reactor 6, and the conveyor 4 is arranged below the filter press 3 in the vertical direction.

[0040] In this embodiment, the powder silo 2, the second and third filtrate tanks, and the fifth storage tank 12 are respectively connected to the first reactor 6, the first reactor 6 is connected to the filter press 3 through a pipeline, the filter press 3 is connected to the third storage tank 10, the third storage tank 10 is connected to the first-third filtrate tanks, the outlet of the first filtrate tank is connected to the second storage tank 9 and the fourth reactor 18 in sequence, the outlet of the fourth reactor 18 is connected to the filter press 3, the outlet of the filter press 3 is connected to the membrane assembly 14 and the third reactor 17 in sequence, the outlet of the third reactor 17 is connected to the fourth storage tank 11, the first storage tank 7 is connected to the third reactor 17, the sixth storage tank 15 is connected to the fourth reactor 18, and the exhaust gas purifier 16 is respectively connected to the first reactor 6, the first-third filtrate tanks, the third reactor 17, and the first storage tank 7.

[0041] like Figure 4 As shown, this embodiment includes the following steps:

[0042] Step 1, solid waste, hardness remover, heavy metal fixing agent and second liquid are respectively transported to the first reactor 6 in a ratio of 1:0.05:0.003:2.5. After stirring in the first reactor 6 for 10 minutes, the solid waste, hardness remover, heavy metal fixing agent and second liquid are transported to the filter press 3 for pressure filtration and dehydration at a feed pressure of 0.6 MPa through the discharge pump of the first reactor 6. After the feeding is completed, the plate and frame feed pipe is backflushed to obtain a first liquid with a solid content of 28 mg / l. The first liquid enters the second reactor 8 through the third storage tank 10.

[0043] Step 2: After the first feed liquid in step 1 is processed by the second reactor and the fourth reactor, it is pumped to the filter press. The stage of pumping to the filter press in step 2 is: filtering in the filter press that has completed the feeding in step 1 but has not yet been squeezed and discharged.

[0044] The filtering conditions of this step are: at a feed pressure of 0.4 MPa, the material is transported to the filter press 3 for filtration. After the feeding is completed, the plate and frame feed pipe is back-blown with compressed air at 0.6 MPa, and then the diaphragm is pressed and dehydrated at a pressure of 1.3 MPa, and then the compressed air is forward-blown with 0.6 MPa to reduce the moisture content of the filter residue, thereby obtaining the first filter residue and a softened liquid with a solid content of 15 mg / l and a carbonate content of 65 mg / l.

[0045] Next, the first filter residue is subjected to second and third stage desalination and intelligent washing, the first filter residue enters the first reactor through a conveyor and a disperser, and the third feed liquid is transported to the first reactor; after stirring in the first reactor for 5-20 minutes, it is transported to a filter press for solid-liquid separation to obtain a second filter residue and a second feed liquid, and the second feed liquid enters the second filtrate tank through a third storage tank to complete the second stage elution process; then, the third stage desalination and intelligent washing is carried out based on the soluble salt content of the solid waste to obtain a recycled material with a soluble salt content of less than 1%.

[0046] Step 3, the softened liquid obtained in step 2 is passed through the third reactor to adjust the pH value to 6.5, the divalent ion content of the produced water treated by the membrane assembly is 3%, the concentrated water yield is 10%, and then it is returned to the first reactor.

[0047] The above steps 1-3 complete one cycle of operation.

[0048] Then, the next cycle of operation begins, and the solid waste, hardness remover, heavy metal fixation agent, and second liquid are respectively transported to the first reactor 6 at a ratio of 1:0.05:0.003:2.3 and stirred for 8 minutes, and then the concentrated water in step 3 is fed into the first reactor. Through the discharge pump of the first reactor 6, at a feed pressure of 0.6 MPa, it is transported to the filter press 3 for filter pressing and dehydration. After the feeding is completed, the plate and frame feed pipe is backwashed to obtain a first liquid with a solid content of 28 mg / l, and the first liquid enters the second reactor 8 through the third storage tank 10.

[0049] Example 2

[0050] This embodiment takes the treatment of solid waste with a salt content of 8% as an example, and adopts a three-time concentrated intelligent washing method. The present invention is based on the solid waste intelligent washing and separation pretreatment chamber comprising a first box body 32 and a second box body 31, and the overall size of the device is 12m×3m×6m.

[0051] The first storage tank 7, the sixth storage tank 15 and the second reactor 8 are arranged on the left side of the first box body 32; the third storage tank 10 and the first reactor 6 are arranged in the middle, and the conveyor 4 is fixedly connected to the top of the first box body 32; the fourth storage tank 11, the fifth storage tank 12 and the distribution room 13 are arranged on the right side. Each module in the first box body 32 is detachably fixedly connected to the first box body 32.

[0052] The second box 31 is provided with an exhaust gas purifier 16, a third reactor 17, a fourth reactor 18, and a seventh storage tank 19 on the left side; a powder bin 2 is provided in the middle, the powder bin 2 is connected to the discharge port of the dust collector 1, and legs are provided at the bottom of the powder bin 2, which are fixedly connected to the base of the second box 31; a filter press 3 is provided on the right side, and the bottom of the filter press 3 is fixedly connected to the base of the second box 31. Each module in the second box 31 is detachably fixedly connected to the second box 31.

[0053] The first box body 32 is arranged at the lower part of the second box body 31 and is fixedly connected to the second box body 31. The powder silo 2 is arranged at the upper part of the first reactor 6, and the discharge port of the powder silo 2 is vertically connected to the feed port of the first reactor 6, and the conveyor 4 is arranged below the filter press 3 in the vertical direction.

[0054] In this embodiment, the powder silo 2, the third storage tank 10, and the fifth storage tank 12 are respectively connected to the first reactor 6, the first reactor 6 is connected to the filter press 3 through a pipeline, the filter press 3 is connected to the third storage tank 10, the outlet of the third storage tank 10 is connected to the second storage tank 9 and the fourth reactor 18 in sequence, the outlet of the fourth reactor 18 is connected to the filter press 3, the outlet of the filter press 3 is connected to the third reactor 17, the outlet of the third reactor 17 is connected to the fourth storage tank 11, the first storage tank 7 is connected to the third reactor 17, the sixth storage tank 15 is connected to the fourth reactor 18, and the exhaust gas purifier 16 is respectively connected to the first reactor 6, the third reactor 17, and the first storage tank 7.

[0055] This embodiment includes the following steps:

[0056] Step 1, solid waste, heavy metal fixing agent and clean water are respectively transported to the first reactor 6 in a ratio of 1:0.003:2.5. After stirring in the first reactor 6 for 10 minutes, the solid waste is transported to the filter press 3 at a feed pressure of 0.6MPa through the discharge pump of the first reactor 6 for pressure filtration and dehydration. After the feeding is completed, the plate and frame feed pipe is back-blown with 0.7MPa compressed air, and then the diaphragm is pressed and dehydrated with a pressure of 1.4MPa, and then the compressed air is forward-blown with 0.7MPa to reduce the moisture content of the filter residue, and a recycled material with a salt content of 0.45% and a first feed liquid with a solid content of 28mg / l is obtained.

[0057] Next, the first feed liquid is concentrated and washed for the second time, and the solid waste, heavy metal fixing agent and the first feed liquid are respectively fed into the first reactor in a ratio of 1:0.003:2.5; after stirring in the first reactor for 10 minutes, it is transported to the filter press for solid-liquid separation to complete the second concentration process, and a recycled material with a salt content of 0.75% and a second concentrated liquid with a solid content of 18 mg / l is obtained.

[0058] Then, the first feed liquid is concentrated and washed for the third time, and the solid waste, heavy metal fixation agent and the first feed liquid are respectively fed into the first reactor at a ratio of 1:0.003:2.5; after stirring in the first reactor for 11 minutes, it is transported to the filter press for solid-liquid separation, completing the second concentration process, and obtaining a regenerated material with a salt content of 0.95% and a third concentrated liquid with a solid content of 15 mg / l. The salt content of the concentrated liquid is 24%, and it enters the second reactor through the third storage tank.

[0059] Step 2: After the concentrated liquid in step 1 is processed by the second reactor and the fourth reactor, it is pumped to the filter press. The stage of pumping to the filter press in step 2 is: filtering in the filter press that has completed the third concentrated feeding in step 1 and has not yet squeezed and unloaded to obtain a softened liquid.

[0060] Step 3, the softened liquid obtained in step 2 is passed through the third reactor to adjust the pH value to 7, the divalent ion content of the produced water treated by the membrane assembly is 2%, and the concentrated water yield is 12%, and then it is returned to the first reactor.

[0061] The above steps 1-3 complete one cycle of operation. The salt content of the purified concentrated liquid obtained after intelligent washing treatment is 24%, the solid content is 15 mg / l, and the carbonate is 50 mg / l, which significantly reduces the subsequent processing volume and processing cost, while improving the quality of the crystallized salt and the stability of the system.

[0062] Then, the next cycle of operation begins, solid waste, heavy metal fixing agent and clean water are respectively transported to the first reactor 6 at a ratio of 1:0.003:2.4 and stirred for 10 minutes, and then the concentrated water in step 3 is fed into the first reactor. Through the discharge pump of the first reactor 6, at a feed pressure of 0.6MPa, it is transported to the filter press 3 for filter pressing and dehydration. After the feeding is completed, the plate and frame feed pipe is back-blown with 0.7MPa compressed air, and then the diaphragm is pressed and dehydrated with a pressure of 1.4MPa, and then the compressed air is blown forward with 0.7MPa to reduce the moisture content of the filter residue, and the regenerated material with a salt content of 0.66% and a solid content of 26mg / l is obtained.

[0063] The present invention is based on the solid waste intelligent washing and separation pretreatment cabin and application method, which can reduce the operation of dynamic equipment, and can save 20-50 degrees of electricity per ton of solid waste intelligent washing and separation process, and reduce the consumption of reagents by 1-5%. For example, the technical solution disclosed in the Chinese invention patent of the water washing and softening system for waste incineration fly ash (publication number CN104843923A) is applied in a 150 tons / day fly ash production line. The power consumption of the water washing liquid purification process is 125 degrees / ton of fly ash, and the reagent consumption of a ton of fly ash is 19%; while the power consumption of the fly ash intelligent washing process in the present invention is 75 degrees / ton, and the reagent consumption is 15% of the fly ash processed. Another example is the technical solution disclosed in the Chinese invention patent for the water washing and softening system for waste incineration fly ash (publication number CN104843923A). In the application of a 150-ton / day kiln ash production line, the power consumption of the water washing liquid purification process is 115 degrees / ton of fly ash, and the chemical consumption per ton of fly ash is 10%; while the power consumption used for the fly ash process in the present invention is 65 degrees / ton, and the chemical consumption accounts for 5%.

[0064] The present invention improves the elution and desalination effect of the integrated equipment based on the solid waste intelligent washing and separation pretreatment cabin and method, and reduces the solid content of the feed liquid by 20-70 mg / l. For example, the technical solution disclosed in the Chinese invention patent, a fly ash water washing and desalination resource system and its integrated equipment (publication number CN118060312A), has a soluble chlorine removal effect of less than 90% in the elution process, and the solid content of the feed liquid is 100-300 mg / l, which increases the utilization rate of the agent by 3-5%. In comparison, the soluble chlorine removal efficiency of the fly ash elution process of the present invention is higher than 98%, and the solid content of the feed liquid is less than 30 mg / l; the present invention reduces the dissolution rate of heavy metals in fly ash by adding a heavy metal fixing agent in the first reactor, thereby reducing the amount of heavy metal sludge produced by the feed liquid purification and reducing the disposal cost of heavy metal sludge. At the same time, by adding a dispersant in the first reactor, the rapid dispersion and secondary mixing effect of the filter residue are improved, thereby improving the chloride ion removal rate in the elution process. In addition, the present invention improves the desalination effect of the integrated equipment by 5-10%, reduces the solid content of the feed liquid by 20-70 mg / l, and reduces the amount of heavy metal sludge by 40-70% by providing a dispersing device and adding a dispersant and a heavy metal fixing agent; by introducing boiler flue gas into the feed liquid and effectively utilizing carbon dioxide in the flue gas, the heavy metal removal efficiency in the feed liquid is further improved while reducing the use of heavy metal removal agents, softening agents and pH neutralizing agents by 40%.

[0065] Although the present invention has been described in detail above by means of general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, without departing from the spirit of the present invention, such as making appropriate changes to the box, changing the position of some equipment in the box, replacing equipment with the same function, or moving some equipment outside the box, etc., these modifications or improvements are all within the scope of protection claimed by the present invention.

Claims

1. A pretreatment chamber based on intelligent washing and separation of solid waste, characterized by: It includes a first box body and a second box body, the first box body is arranged at the lower part of the second box body, the interiors of the first box body and the second box body are both modular structures, a first reactor is arranged inside the first box body, and the feed inlet of the first reactor is connected to the conveyor through a breaker; a powder silo, a filter press and a plurality of filtrate tanks are arranged inside the second box body, the powder silo is arranged at the upper part of the first reactor, and the discharge port of the powder silo is vertically connected to the feed inlet of the first reactor, the conveyor is arranged below the filter press in the vertical direction, and the first reactor is connected to the filter press.

2. The solid waste intelligent washing and separation pretreatment chamber according to claim 1 is characterized by: The first box body is also provided with a first storage tank, a second storage tank, a third storage tank, a fourth storage tank, a fifth storage tank, a sixth storage tank, a second reactor and a membrane assembly. The filter press is respectively connected to the third storage tank and the membrane assembly. The third storage tank is connected to a plurality of filtrate pools. The outlet of the first filtrate pool among the plurality of filtrate pools is connected to the second reactor. The fifth storage tank is connected to the first reactor.

3. The solid waste intelligent washing and separation pretreatment chamber according to claim 1 is characterized by: The second box body is also provided with an exhaust gas purifier, a third reactor, a fourth reactor and a seventh storage tank, the sixth storage tank is connected to the fourth reactor, the outlet of the fourth reactor is connected to the filter press, the filter press and the first storage tank are respectively connected to the third reactor, the outlet of the third reactor is connected to the fourth storage tank, and the exhaust gas purifier is respectively connected to the first reactor, several filtrate tanks, the third reactor and the first storage tank.

4. The solid waste intelligent washing and separation pretreatment chamber according to claim 1 is characterized by: The filter press can be replaced by one of a screw press, a screw press dehydrator and a centrifuge.

5. An application method based on a solid waste intelligent washing and separation pretreatment chamber, characterized in that: The smart washing separation process includes the following steps: Step 1: transporting solid waste, hardness remover, heavy metal fixing agent, dispersant and process water to the first reactor in a mass ratio of 1: (0-0.1): (0-0.005): (0-0.003): (1.5-3), stirring in the first reactor for 5-20 minutes, and then transporting to a filter press for solid-liquid separation to obtain a first feed liquid, and the first feed liquid enters the second reactor through a third storage tank; Step 2: After the first feed liquid in step 1 is processed by the second reactor and the fourth reactor, it is pumped into a filter press for filtration to obtain a softened feed liquid; Step 3, the softened liquid in step 2 is processed in turn through the third reactor and the membrane assembly to ensure that the divalent ion content of the produced water is no more than 5%, and the concentrated water returns to the first reactor.

6. The application method based on the solid waste intelligent washing and separation pretreatment chamber according to claim 5 is characterized by: After the first reactor in step 1 is stirred for not less than 5 minutes, the concentrated water in step 3 is fed into the first reactor to recycle the unreacted reagent.

7. The application method based on the solid waste intelligent washing and separation pretreatment chamber according to claim 5 is characterized in that: In step 1, the first filter residue is passed through a conveyor and a disperser into the first reactor, and the third feed liquid is conveyed to the first reactor; after being stirred in the first reactor for 5-20 minutes, it is conveyed to a filter press for solid-liquid separation to obtain a second filter residue and a second feed liquid, and the second feed liquid enters a second filtrate tank through a third storage tank, completing a cycle of desalination process; multi-stage intelligent washing is performed based on the soluble salt content of the solid waste to obtain recycled material, and the feed liquid is stored in several filtrate tanks for utilization.

8. The application method based on the solid waste intelligent washing and separation pretreatment chamber according to claim 5 is characterized by: In step 1, the first feed liquid enters the first reactor through the third storage tank, and the solid waste, hardness remover, heavy metal fixing agent, and dispersant are respectively transported to the first reactor in proportion; after stirring in the first reactor for 5-20 minutes, it is transported to the filter press for solid-liquid separation to obtain the second filter residue and the second feed liquid, completing a cycle of concentration process; The slurry is concentrated and washed multiple times based on the soluble salt content of the solid waste to obtain recycled material. The concentrated slurry from the last cycle enters the second reactor through the third storage tank.

9. The application method based on the solid waste intelligent washing and separation pretreatment chamber according to claim 5 is characterized by: The stage of pumping to the filter press in step 2 is to filter in the filter press that has completed loading and not yet been unloaded in step 1 to ensure that the solid content of the softened liquid is less than 10 mg / l and the carbonate content is less than 80 mg / l.

10. The application method based on the solid waste intelligent washing and separation pretreatment chamber according to claim 5 is characterized in that: In step 2, the boiler flue gas after dust removal and desulfurization is fed into the second reactor and adjusted to a pH value of 9-10.

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