CN109351762B - Harmless treatment system and process for polyaluminium chloride water purifying agent waste residues - Google Patents
Harmless treatment system and process for polyaluminium chloride water purifying agent waste residues Download PDFInfo
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- CN109351762B CN109351762B CN201811541899.2A CN201811541899A CN109351762B CN 109351762 B CN109351762 B CN 109351762B CN 201811541899 A CN201811541899 A CN 201811541899A CN 109351762 B CN109351762 B CN 109351762B
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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
Abstract
The utility model provides a polyaluminium chloride water purification agent waste residue innocent treatment system and technology, belongs to industrial waste residue processing technology field, including former feed bin, mixing tank, dosing tank, sedimentation tank, plate and frame filter press, circulation tank, drying-machine, rotary kiln and the workshop of keeping in, be equipped with the lifting machine between former feed bin and the mixing tank, the polyaluminium chloride water purification agent waste residue that is located former feed bin sends into the mixing tank through the lifting machine, is equipped with rabbling mechanism in the mixing tank, and the export of dosing tank passes through the pipeline and the import of mixing tank links to each other, and the export of mixing tank passes through the import of pipeline and sedimentation tank and links to each other, and the upper liquid in the sedimentation tank passes through the pipeline and sends into the circulation tank, and lower floor's precipitate passes through the belt and sends to the plate and frame filter press, and the filter press liquid that the plate and frame filter press produced sends into the circulation tank through the pipeline, and the filter cake that the plate and frame filter press produced sends into the drying-machine and preheats, and the rotary kiln is dried to the filter cake after preheating, and conveying the dried product into a temporary storage workshop through a belt conveyor.
Description
Technical Field
The invention belongs to the field of industrial waste residue treatment, and particularly relates to a system and a process for harmlessly treating waste residues of a polyaluminium chloride water purifying agent.
Background
According to relevant statistics, 300 water purifying agent enterprises in the country in 2015 have more than 300 families, the market water purifying agent demand reaches 417.6 ten thousand tons, and the demand of the water purifying agent is still increasing in recent years along with the gradual increase of the environmental protection requirement. And (3) statistical finding: the consolidation market has 80 water purifying agent production enterprises, the total annual production is more than 90 ten thousand tons, the water purifying agent production accounts for about 60 percent of the total national production, and meanwhile, the water purifying agent waste residue regeneration material generated each year is about 40 ten thousand tons. After a landfill site is built, landfill is carried out, and a certain amount of cultivated land or mountain land needs to be occupied; meanwhile, necessary anti-seepage and anti-corrosion measures are required for landfill construction, and the influence of leachate on the environment is avoided. The problem of treatment of waste residue regeneration materials of the polyaluminium chloride water purifying agent is an important factor which troubles the industrial development of the polyaluminium chloride water purifying agent, and in view of the fact that a consolidation area belongs to a mountain area, waste residues generated before 2018 are mostly filled in a mountain ditch after being simply treated, and bring great pollution risks to underground water, soil and atmosphere:
(1) directly pollutes the soil. The storage waste residues occupy the field, and the waste residues spread everywhere under the weathering effect can pollute the soil and can influence crops. The soil is polluted and difficult to recover, and even becomes a dead land.
(2) Indirectly polluting the water area. Waste residues enter ground water or permeate underground water through artificial input, wind blowing, rainwater carrying and the like, so that water areas are polluted and water quality is damaged. Worse, the solid waste is directly poured into rivers and lakes, causing more serious pollution and causing the death of a large amount of aquatic organisms due to poisoning.
The polyaluminium chloride water purifying agent waste residue treated by the method is derived from waste residue left after the polyaluminium chloride water purifying agent is produced by bauxite in the consolidated market, wherein the waste residue contains arsenic, mercury, cadmium, lead, zinc and the like, and is a heavy metal toxic substance which has the most serious harm to people and organisms, and how to properly treat the polyaluminium chloride water purifying agent waste residue is a key point of attention in the industry. The waste residue regeneration material of the polyaluminium chloride water purifying agent is used as a building material for secondary utilization, so that the problem of pollution caused by the waste residue regeneration material of the polyaluminium chloride water purifying agent is thoroughly solved, the requirement of infrastructure on the traditional building material is reduced, resources are saved, and the method has remarkable economic and social benefits.
Disclosure of Invention
The invention aims to provide a harmless treatment system and process for polyaluminium chloride water purifier waste residues.
Based on the purpose, the invention adopts the following technical scheme:
a harmless treatment system for waste residues of a polyaluminium chloride water purifying agent, which comprises a raw material bin, a mixing tank, a dosing tank, a sedimentation tank, a plate-and-frame filter press, a circulating water tank, a dryer, a rotary kiln and a temporary storage workshop, be equipped with the lifting machine between former feed bin and the mixed pond, the polyaluminium chloride water purification agent waste residue that is located former feed bin sends into mixed pond through the lifting machine, be equipped with rabbling mechanism in the mixed pond, the export of adding the medicinal cupping passes through the pipeline and mixes the import in pond and link to each other, the export of mixed pond passes through the pipeline and links to each other with the import of sedimentation tank, the liquid on upper strata in the sedimentation tank sends into the circulation pond through the pipeline, lower floor's precipitate is sent to plate and frame filter press through the belt, the circulation pond is sent into through the pipeline to the pressure filtrating that plate and frame filter press produced, the filter cake that plate and frame filter press produced sends into the drying-machine and preheats, the filter cake after preheating sends into rotary kiln and dries, the product after drying sends into the workshop of keeping in temporary through band conveyer.
And a coagulant is filled in the medicine adding tank, and the coagulant is triethanolamine or CaO solid.
And water in the circulating water tank returns to the mixing tank for size mixing.
A harmless treatment process for polyaluminium chloride water purifier waste residues specifically comprises the following steps:
(1) dissolving the polyaluminium chloride water purifying agent waste residue in water, and mixing to obtain a 30-50 wt% solution (acidity, pH value is about 4.0);
(2) adding a coagulant into the solution under stirring, and stirring for 20-40 min;
(3) naturally settling for 10-20 min to obtain a precipitate and a supernatant, and sending the supernatant to size mixing;
(4) performing plate-and-frame filter pressing on the precipitate to enable the water content of the precipitate to be 45-50%;
(5) preheating the filter cake after filter pressing in a dryer, and heating the filter cake to 180-220 ℃ to reduce the water content of the filter cake to below 40%;
(6) drying the preheated filter cake, wherein the drying temperature is 250-280 ℃, and the water content of the dried material is below 10%;
(7) and (4) inspecting the dried finished product by adopting a titration method, and leaving the factory for engineering application after each index meets the standard requirement.
Further, the plate-frame filtration is carried out under the pressure of 0.3-0.5 MPa and the water content of the precipitate is 45-50% by filtering with 15-25 layers of filter bags.
The addition amount of the coagulant is 1 to 5 percent of the mass of the waste residue of the polyaluminium chloride water purifying agent.
Compared with the prior art, the invention has the following advantages: the invention relates to a method for cleaning and environment-friendly treatment of waste residues of a primary polyaluminium chloride water purifying agent, which solves the problem of secondary pollution caused by traditional treatment, and does not generate toxic and harmful substances in the treatment process. The product is treated and the secondary delivery inspection is carried out, and the treated product can be ensured to be completely pollution-free. Meanwhile, the waste residues of the treated polyaluminium chloride water purifying agent can be used as fillers for engineering application, and the waste is changed into valuable, so that the cost is low.
Compared with the prior art, the treatment method provided by the invention has the advantages of safety, effectiveness, low cost, simple process, convenience and simplicity in operation, obvious economic benefit and environmental benefit, and very important significance in the aspects of resource recovery and environmental protection.
Drawings
Fig. 1 is a schematic structural view of a system for harmlessly treating waste residues of a polyaluminium chloride water purifying agent, wherein the system comprises a raw material bin 1, a mixing tank 2, a sedimentation tank 3, a plate-and-frame filter press 4, a circulating water tank 5, a dryer 6, a rotary kiln 7, a temporary storage workshop 8, a first dosing tank 91 and a second dosing tank 92.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the following specific examples, but the scope of the present invention is not limited thereto. The plate-and-frame filter press in the embodiment is of a QY-1400 type, and the technical parameters are as follows: 20 layers, power of 35kw, 2 tons/hour and pressure of 0.4 MPa.
Example 1
The utility model provides a polyaluminium chloride water purification agent waste residue innocent treatment system, includes former feed bin 1, mixing tank 2, adds medicinal cupping 9, sedimentation tank 3, plate and frame filter press 4, circulating water tank 5, drying-machine 6, rotary kiln 7 and workshop 8 of keeping in, be equipped with the lifting machine between former feed bin 1 and the mixing tank 2, the polyaluminium chloride water purification agent waste residue that is located former feed bin 1 sends into mixing tank 2 through the lifting machine, is equipped with rabbling mechanism in the mixing tank 2, and the export that adds medicinal cupping 9 passes through the pipeline and links to each other with the import of mixing tank 2, and the export of mixing tank 2 passes through the pipeline and links to each other with the import of sedimentation tank 3, and the upper liquid passes through the pipeline in sedimentation tank 3 and sends into circulating water tank 5, and lower floor's precipitate passes through the belt and sends into plate and frame filter press 4, and the filter press 4 produced pressure is sent into circulating water tank 5 through the pipeline, and drying-machine 6 that the filter press 4 produced preheats, the preheated filter cake is sent to a rotary kiln 7 for drying, and the dried product is sent to a temporary storage workshop 8 through a belt conveyor. And a coagulant is filled in the medicine adding tank 9, and the coagulant is triethanolamine or CaO solid. The water in the circulating water tank 5 returns to the mixing tank 2 for size mixing.
The process for carrying out harmless treatment on the polyaluminium chloride water purifier waste residues by utilizing the system comprises the following steps:
the method comprises the following steps: ingredients
Pushing the waste residues of the polyaluminium chloride water purifying agent into a lifter by a forklift, conveying the waste residues into a mixing pool by the lifter, dissolving the waste residues into water, and mixing the mixed solution to obtain a 30-50 wt% solution, wherein a computer automatically distributes raw materials into the mixing pool through a pipeline according to the running state of the mixing pool;
step two: adding medicament and stirring
A stirrer is arranged on the mixing tank, and a coagulant CaO accounting for 3 percent of the mass of the waste residues is added under stirring, and the stirring and mixing duration is about 30 min;
step three: precipitation of
Pumping the uniformly mixed suspension to a sedimentation tank by a pump for natural sedimentation, pumping the sediment to a filter pressing conveyer belt by a mud pump, and delivering the supernatant to a circulating water tank, wherein the whole sedimentation time lasts for about 15 min;
step four: plate frame filter pressing
Performing filter pressing on the precipitate by using a plate-and-frame filter press, filtering by using a filter bag with 20 layers under the pressure of 0.4MPa, wherein the water content of a filter cake is about 50% after the filter pressing is finished, and feeding a filter pressing liquid generated by the filter pressing into a circulating water tank;
step five: drying by baking
Preheating: and (4) preheating the filter cake after filter pressing in a dryer so as to improve the drying efficiency of the rotary kiln. The dryer adopts a steam boiler as a heat source to heat the filter cake to about 200 ℃. At this point, the water content of the filter cake was reduced from 50% to 40%.
Drying: and conveying the preheated filter cake into a rotary kiln for drying by a closed belt conveyor and a lifter, wherein the drying temperature is 270 ℃, and the water content of the dried material is reduced to below 10%. And conveying the mixture to a temporary storage workshop for temporary storage by using a closed belt conveyor.
Step six: detection of
And (4) inspecting the dried finished product by adopting a titration method, and leaving the factory for engineering application after each index meets the standard requirement. The table for comparing the toxicity detection and the environmental protection requirement of the waste residue treated by the steps is shown in the following table.
As can be seen from Table 1, the pretreated PAC waste residues are detected by a titration method, the heavy metal ion content is far lower than the standard requirement, and the PAC waste residues belong to class I general solid wastes and do not belong to toxic and harmful wastes; under the condition that the grading and the strength are satisfied, the engineering application can be directly carried out, and secondary treatment is not needed.
Claims (2)
1. The utility model provides a polyaluminium chloride water purification agent waste residue innocent treatment system, characterized by, including raw materials storehouse, mixing tank, dosing tank, sedimentation tank, plate and frame filter press, circulation tank, drying-machine, rotary kiln and the workshop of keeping in, be equipped with the lifting machine between raw materials storehouse and the mixing tank, the polyaluminium chloride water purification agent waste residue that lies in raw materials storehouse sends into the mixing tank through the lifting machine, be equipped with rabbling mechanism in the mixing tank, the export of dosing tank passes through the pipeline and links to each other with the import of mixing tank, the export of mixing tank passes through the pipeline and links to each other with the import of sedimentation tank, the upper liquid in the sedimentation tank passes through the pipeline and sends into the circulation tank, lower floor's precipitate is sent to the plate and frame filter press through the belt, the circulating water tank is sent into through the pipeline to the pressure filtrate that the plate and frame filter press produced, conveying the dried product into a temporary storage workshop through a belt conveyor, wherein a coagulant is filled in the medicine adding tank, and the coagulant is triethanolamine or CaO solid;
the harmless treatment process of the polyaluminium chloride water purifier waste residues by utilizing the system is as follows:
(1) dissolving the polyaluminium chloride water purifying agent waste residue in water for size mixing to obtain a 30-50 wt% solution;
(2) adding a coagulant into the solution under stirring, and stirring for 20-40 min;
(3) naturally settling for 10-20 min to obtain a precipitate and a supernatant, and sending the supernatant to size mixing;
(4) performing plate-and-frame filter pressing on the precipitate to enable the water content of the precipitate to be 45-50%;
(5) preheating the filter cake after filter pressing in a dryer, and heating the filter cake to 180-220 ℃ to reduce the water content of the filter cake to below 40%;
(6) drying the preheated filter cake, wherein the drying temperature is 250-280 ℃, and the water content of the dried material is below 10%;
(7) and (3) checking the dried finished product by a titration method, and after various indexes meet the standard requirements, taking the finished product out of the field for engineering application, wherein the plate-and-frame pressure filtration is carried out under the pressure of 0.3-0.5 MPa and the filtration of 15-25 layers of filter bags, so that the water content of the precipitate is 45-50%, and the addition amount of the coagulant is 1-5% of the mass of the polyaluminium chloride water purifier waste residue.
2. A harmless treatment process for waste residues of a polyaluminium chloride water purifier by using a harmless treatment system for the waste residues of the polyaluminium chloride water purifier is characterized by comprising the following steps:
(1) dissolving the polyaluminium chloride water purifying agent waste residue in water for size mixing to obtain a 30-50 wt% solution;
(2) adding a coagulant into the solution under stirring, and stirring for 20-40 min; the addition amount of the coagulant is 1 to 5 percent of the mass of the waste residue of the polyaluminium chloride water purifying agent;
(3) naturally settling for 10-20 min to obtain a precipitate and a supernatant, and sending the supernatant to size mixing;
(4) performing plate-and-frame filter pressing on the precipitate, wherein the plate-and-frame filter pressing is performed under the pressure of 0.3-0.5 MPa and the water content of the precipitate is 45-50% through filtering with 15-25 filter bags;
(5) preheating the filter cake after filter pressing in a dryer, and heating the filter cake to 180-220 ℃ to reduce the water content of the filter cake to below 40%;
(6) drying the preheated filter cake, wherein the drying temperature is 250-280 ℃, and the water content of the dried material is below 10%;
(7) checking the dried finished product by a titration method, and leaving the factory for engineering application after each index meets the standard requirement;
the innocent treatment system has the following structure:
including former feed bin, mixing tank, dosing tank, sedimentation tank, plate and frame filter press, circulating water pond, drying-machine, rotary kiln and workshop of keeping in, be equipped with the lifting machine between former feed bin and the mixing tank, the polyaluminium chloride water purification agent waste residue that is located former feed bin sends into the mixing tank through the lifting machine, be equipped with rabbling mechanism in the mixing tank, the export of dosing tank passes through the import of pipeline and mixing tank and links to each other, the export of mixing tank passes through the import of pipeline and sedimentation tank and links to each other, the liquid of upper strata passes through the pipeline in the sedimentation tank and sends into circulating water pond, lower floor's precipitate passes through the belt and sends to plate and frame filter press, the pressure filtrate that plate and frame filter press produced sends into circulating water pond through the pipeline, the filter cake that plate and frame filter press produced preheats, the filter cake after preheating is sent into rotary kiln and is dried, the product after drying sends into the workshop of keeping in through the belt conveyor, the coagulant is equipped with in the dosing tank, the coagulant is triethanolamine or CaO solid.
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| CN103819069B (en) * | 2013-12-24 | 2016-03-16 | 华新环境工程有限公司 | A kind of deeply dehydrating sludge and cement kiln method of comprehensive utilization |
| JP6503898B2 (en) * | 2014-06-19 | 2019-04-24 | 宇部興産株式会社 | Processing method of incineration ash |
| CN108870405A (en) * | 2017-05-08 | 2018-11-23 | 衡水精臻环保技术有限公司 | A kind of hazardous waste collection disposing technique |
| CN107082440B (en) * | 2017-05-13 | 2019-02-26 | 江苏蓝遥净水剂有限公司 | A kind of aluminium polychloride production waste residue recycle device |
| CN107352761A (en) * | 2017-07-01 | 2017-11-17 | 河源市绿江环保科技有限公司 | A kind of medical sludge harmless treatment method and its system |
| CN108503003B (en) * | 2018-04-13 | 2021-02-19 | 广州微碳科技有限公司 | Rapid drying treatment process for sewage sludge based on microwave-polar medium substances |
| CN108910981A (en) * | 2018-07-31 | 2018-11-30 | 四川绵竹三佳饲料有限责任公司 | A kind of phosphorus-containing wastewater cleanser and phosphorus ore waste residue permeate sewage water treatment method |
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Inventor after: Li Chuanqi Inventor after: Li Feng Inventor after: Yan Wei Inventor after: Wang Jianbo Inventor after: Han Panke Inventor after: Ma Zengmei Inventor after: Jia Jinhong Inventor after: Ma Qiuzhu Inventor after: Xu Qiang Inventor after: Jiao Mingdong Inventor after: Cheng Qian Inventor after: Zheng Wenju Inventor after: Liang Jiukai Inventor after: Geng Xiaoke Inventor before: Li Chuanqi Inventor before: Li Feng Inventor before: Yan Wei Inventor before: Wang Jianbo Inventor before: Han Panke Inventor before: Ma Zengmei Inventor before: Jia Jinhong Inventor before: Ma Qiuzhu Inventor before: Xu Qiang Inventor before: Jiao Mingdong Inventor before: Cheng Qian Inventor before: Zheng Wenju Inventor before: Liang Jiukai Inventor before: Geng Xiaoke |
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