CN111320301A - Comprehensive treatment and recovery process for waste acid and waste alkali in hazardous waste recovery industry - Google Patents
Comprehensive treatment and recovery process for waste acid and waste alkali in hazardous waste recovery industry Download PDFInfo
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- CN111320301A CN111320301A CN202010164057.0A CN202010164057A CN111320301A CN 111320301 A CN111320301 A CN 111320301A CN 202010164057 A CN202010164057 A CN 202010164057A CN 111320301 A CN111320301 A CN 111320301A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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Abstract
The invention discloses a comprehensive treatment and recovery process of waste acid and waste alkali for hazardous waste recovery industry. The process comprises the following steps: the industrial waste acid, waste alkali and comprehensive waste unit sorting waste acid, waste alkali and waste alkali are classified into waste acid, waste alkali with lower available component content, waste acid, waste alkali capable of being separated and recycled, and waste acid, waste alkali containing recyclable elements. Waste acid with lower component content and waste obtained after neutralization of self-produced waste alkali subjected to air floatation treatment are subjected to solid-liquid separation and then classified treatment; waste acid which can be separated and recycled is recycled into finished acid after impurity filtration, concentration and evaporation; adding auxiliary materials into waste acid containing recyclable elements to generate chemical reaction, and performing solid-liquid separation and evaporative crystallization to generate solid and liquid finished salt. The industrial waste alkali is directly used for neutralizing waste acid, spraying acid and alkali and preparing solid finished salt after air floatation treatment and impurity removal. The method has the advantages of strict process, safety, environmental protection, high production efficiency and recovery rate, realizes the comprehensive treatment and recovery of the waste acid and the waste alkali, and has high social benefit and economic benefit.
Description
Technical Field
The invention belongs to the field of comprehensive treatment of waste acid and waste alkali, and particularly relates to a comprehensive treatment and recovery process of waste acid and waste alkali for hazardous waste recovery industry
Background
Industrial processes, especially chemical processes, produce large amounts of hazardous waste materials such as waste mineral oil sludge, waste packaging containers, waste organic solvents, waste acids, waste alkalis, and the like. The hazardous wastes have the characteristics of serious pollution and high recovery rate, and need to be purified, refined and regenerated according to the types of the hazardous wastes through a special hazardous waste recovery industry. The waste acid and the waste alkali treated by the hazardous waste recovery industry come from the waste acid and the waste alkali generated in the processes of pickling and cleaning the surfaces of metal components in the modern equipment manufacturing industry, manufacturing refined petroleum products, electronic processing and producing, preparing and using processes of some pharmaceutical enterprises. If the waste acid and the waste alkali are directly discharged without effective treatment, huge damage can be caused to the ecological environment, and if the waste acid and the waste alkali are directly discharged after being purified by neutralization reaction, recyclable parts in the waste acid and the waste alkali can not be recycled, thereby causing waste on resources. According to the invention, the waste acid and the waste alkali are classified according to the material composition characteristics and physical and chemical properties of different types of waste acid and waste alkali, so that the treatment pressure of hazardous wastes can be relieved, secondary pollution is prevented, the resource recycling can be realized, and the method has great economic and environmental significance.
Disclosure of Invention
The invention provides a comprehensive treatment and recovery process of waste acid and waste alkali for hazardous waste recovery industry, which is used for reclassifying waste acid and waste alkali generated in industrial production, purifying and recovering the waste acid and the waste alkali, and reasonably disposing waste liquid, waste gas and residues generated in the production process.
In order to solve the technical problems, the invention adopts a technical scheme that: a comprehensive treatment and recovery process of waste acid and waste alkali for hazardous waste recovery industry comprises the following steps:
(1) waste acid and waste alkali classification: collecting industrial waste acid, waste alkali and comprehensive waste unit sorting waste acid and self-produced waste alkali generated after hazardous waste is cleaned, conveying the collected waste acid and self-produced waste alkali to a storage tank area and a corresponding bin position of a warehouse through a pump for storage, simultaneously respectively sampling and detecting incoming materials, dividing waste acid and waste alkali with lower content of available components and poorer economy into I-type waste acid and waste alkali according to detection results, dividing waste acid and waste alkali with impurities capable of being separated and recycled according to boiling point difference into II-type waste acid and waste alkali, dividing waste acid and waste alkali with single components and containing resource elements into III-type waste acid and waste alkali, and dividing waste acid and waste alkali which can be used for other processes of hazardous waste recovery after detection into IV-type waste acid and waste alkali;
(2) treating type I waste alkali: after residual oil in the I-type waste alkali subjected to classification treatment in the step (1) is removed through air floatation treatment, neutralizing the I-type waste alkali subjected to classification treatment in the step (1) and spraying acid and alkali;
(3) treating the type II waste alkali: filtering impurities of the II-type waste alkali subjected to classification treatment in the step (1) and then using the II-type waste alkali for acid-base spraying;
(4) treating III type waste alkali: filtering impurities of the III-class waste alkali classified and treated in the step (1) to generate solid finished salt;
(5) and IV, treating the waste alkali: after the IV-class alkali waste classified and treated in the step (1) is subjected to air floatation treatment to remove residual oil, the IV-class alkali waste is used for treating heavy metal-related waste in the recovery process of hazardous waste, adjusting the pH value in a wastewater station, treating highly toxic substances, treating silver-containing waste liquid and spraying acid and alkali in incineration tail gas;
(6) treating type I waste acid: carrying out air floatation pretreatment on the I-type waste acid subjected to classification treatment in the step (1), pumping the waste acid subjected to air floatation into a neutralization reaction kettle, adjusting the pH value by adding alkali or waste alkali, a precipitator, oxidants such as hydrogen peroxide and ferrous sulfate, a flocculating agent and the like, converting a pollution factor into harmless components, and then carrying out air floatation treatment to further remove residual oil;
(7) solid-liquid separation: and (4) performing solid-liquid separation on the harmless components treated in the step (6), and respectively treating separated waste liquid according to the content of pollutant factors: directly treating low-salt wastewater in a wastewater treatment station, performing evaporation concentration treatment on high-salt wastewater, sending evaporated condensed wastewater to the wastewater treatment station for treatment, and treating evaporated salt residues outside the factory;
(8) treating II type waste acid: removing solid particle impurities from the II-class waste acid subjected to classification treatment in the step (1) through a filter, and periodically collecting filter residues and then sending the filter residues to an incineration unit for incineration disposal;
(9) evaporation, concentration and recovery: conveying the filtrate obtained after treatment in the step (8) to a waste acid and alkali unit evaporation concentration device, heating by using steam to separate liquid impurities in the material from the material in a gas state, stopping heating after the concentration of the filtrate reaches a corresponding standard, cooling the concentrated filtrate by using a cooling system, and conveying the concentrated filtrate to a storage tank by using a pump to be stored after the quality requirement of a finished product acid is met;
(10) treating III waste acid: removing solid particle impurities from the III waste acid subjected to classification treatment in the step (1) through a filter, and periodically collecting filter residues and then sending the filter residues to an incineration unit for incineration disposal;
(11) preparing a salt solution: detecting the filtrate obtained after the treatment in the step (10), determining the type and the quantity of the added auxiliary materials according to the detection result, and adding related auxiliary materials into the reaction kettle according to the quantity through a metering system to perform chemical reaction with the raw materials so as to realize component change or impurity separation and form a salt solution or precipitate;
(12) solid-liquid separation of salt solution: carrying out fine processing such as evaporation, crystallization and drying on the salt product obtained after the treatment in the step (11) to prepare three liquid, semi-liquid or solid products, transporting the liquid product in a ton bucket, a tank car and the like according to the packaging requirements of customers, and selling the solid product after bagging;
(13) and IV, treating waste acid: and (3) removing residual oil from the IV-class waste acid subjected to classification treatment in the step (1) through air flotation treatment, and then using the IV-class waste acid for treatment of heavy metal-related waste, regulation of pH value in a wastewater station and comprehensive utilization of a catalyst in a hazardous waste recovery process.
Further, the industrial waste acid and the comprehensive waste unit sorting waste acid and the self-produced waste alkali which are generated after the dangerous waste is cleaned and pumped to the storage tank area in the step (1) are transported by a tank car and pumped to a warehouse for transportation by a barrel.
Further, the pre-air floatation treatment of the I-type waste acid in the step (6) is carried out, so that air floatation waste gas and air floatation waste liquid generated by the air floatation treatment of harmless components are delivered to an incineration unit for incineration disposal.
Further, in the step (6), reaction waste gas and waste water generated by the reaction kettle in the waste acid and waste alkali neutralization process are evaporated, concentrated and noncondensable gas is sent to an acid and alkali spraying system in a workshop for treatment, filtered by activated carbon and discharged through an exhaust funnel.
Further, the water content of the filter residue obtained by solid-liquid separation in the step (7) reaches 60%, the filter residue is firstly sent to a sludge drying device in a workshop for drying, and after the water content is reduced to below 30%, the filter residue is respectively treated according to the content of pollutant factors.
Further, in the step (9), acid gas generated in the concentration process enters a subsequent condensation system for condensation, non-condensable gas enters an acid-base spraying system in a workshop for treatment, is filtered by activated carbon and then is discharged through an exhaust funnel, and condensed wastewater is sent to a wastewater treatment station for treatment.
Further, in the step (11), the salt solution is prepared by adding ammonium carbonate to the waste sulfuric acid containing ammonium ions and adding calcium hydroxide to the waste nitric acid containing heavy metal ions.
The invention has the beneficial effects that: the comprehensive treatment and recovery process for waste acid and waste alkali in the hazardous waste recovery industry realizes the classified treatment of the waste acid and the waste alkali and the proper treatment of residual pollutants, thereby ensuring that the process is pollution-free. The waste acid and the waste alkali with resource value are processed and then converted into finished acid, finished alkali and salt products which can be continuously used, thereby realizing the recovery of resources.
Drawings
FIG. 1 is a process flow diagram of the present invention
Detailed Description
The invention is further illustrated by the following examples, which are not intended to be limiting in any way. Any other examples, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1:
the comprehensive treatment and recovery process for waste acid and waste alkali in the hazardous waste recovery industry in the embodiment 1 comprises the following steps:
(1) waste acid and waste alkali classification: detecting waste acid mainly generated by scouring residues in a steel waste packaging barrel in the recovery process of hazardous waste, detecting that the components of the waste acid mainly comprise hydrochloric acid with the concentration of 12 percent and the ferrous ion concentration of 90g/L and nitric acid with the concentration of 14 percent and the ferrous ion concentration of 15g/L as main components, and classifying the waste acid into I-type waste acid with lower recovered content and poorer economy according to the detection result;
(2) treating type I waste acid: firstly carrying out air floatation pretreatment on the I-type waste acid classified and treated in the step (1), pumping the waste acid subjected to air floatation into a neutralization reaction kettle, neutralizing the waste acid by adding alkali or waste alkali, evaporating and concentrating reaction waste gas and waste water generated in the reaction kettle in the waste acid and waste alkali neutralization process, conveying noncondensable gas into an acid-alkali spraying system in a workshop for treatment, filtering by active carbon, discharging through an exhaust funnel, adding oxidants such as hydrogen peroxide, ferrous sulfate and the like into the neutralized solution to adjust the pH value of the solution, then adding a precipitator to precipitate impurity ions mainly containing ferrous ions, adding a flocculating agent to enable other particles or granules which are difficult to separate in the solution to be close to each other and to be discharged together by a chemical method, thereby converting pollution factors into harmless components, then carrying out air floatation treatment on the harmless components to further remove residual oil, wherein the air floatation waste gas generated in the air floatation process is used for air floatation, The air-float waste liquid is sent to an incineration unit for incineration disposal;
(3) solid-liquid separation: and (3) performing solid-liquid separation on the harmless components treated in the step (2), wherein the water content of filter residues obtained after the solid-liquid separation reaches 60%, sending the filter residues to a sludge drying device in a workshop for drying, and directly feeding the obtained low-salt wastewater into a wastewater treatment station for disposal after the water content is reduced to below 30%.
Example 2:
the comprehensive treatment and recovery process for waste acid and waste alkali in the hazardous waste recovery industry, which is described in the embodiment 2, comprises the following steps:
(1) waste acid and waste alkali classification: the waste acid generated in the production process of chloral from a chemical plant is detected, and the components of the waste acid are mainly sulfuric acid with the mass fraction of 65-75%, chloral with the mass fraction of 1-3% and other organic impurities with the mass fraction of 1%. Classifying the waste acid into II types of waste acid which can be separated and recycled according to the boiling point difference according to the detection result;
(2) treating II type waste acid: removing solid particle impurities from the II-class waste acid subjected to classification treatment in the step (1) through a filter, and periodically collecting filter residues and then sending the filter residues to an incineration unit for incineration disposal;
(3) evaporation, concentration and recovery: and (3) conveying the filtrate obtained after treatment in the step (2) to a waste acid alkali unit evaporation concentration device, heating by using steam to separate liquid impurities in the material from the material in a gas state, stopping heating and cooling the concentrated sulfuric acid by using a cooling system when the mass fraction of the sulfuric acid is more than 95% and no chloral is detected, conveying the sulfuric acid to a storage tank by using a pump to store after the acid quality requirement of a finished product is met, and performing alkaline hydrolysis on the precipitated chloral-containing precipitate.
Example 3:
the comprehensive treatment and recovery process for waste acid and waste alkali in the hazardous waste recovery industry, which is described in the embodiment 3, comprises the following steps:
(1) waste acid and waste alkali classification: detecting the waste alkali generated in the petrochemical production process, detecting that the components of the waste alkali mainly comprise sodium hydroxide solution containing inorganic and organic sulfides such as sulfide, mercaptan and the like, and classifying the waste alkali into I-type waste alkali which can be separated and recovered according to the difference of boiling points according to the detection result;
(2) treating type I waste alkali: firstly carrying out air floatation pretreatment on the I-type waste alkali classified and treated in the step (1), pumping the air-floated waste alkali into a neutralization reaction kettle, neutralizing the waste alkali by adding waste acid, delivering hydrogen sulfide and carbon dioxide gas released by the reaction kettle in the neutralization process of the waste acid and the waste alkali to an acid-base spraying system in a workshop for treatment, filtering the gas by using activated carbon, discharging the gas through an exhaust funnel, adding an oxidant into the neutralized solution to adjust the pH value of the solution, then adding a precipitator to precipitate impurities, adding a flocculating agent to enable other particles or granules which are difficult to separate in the solution to be close to each other and gathered and discharged together by a chemical method, so that a pollution factor is converted into harmless components, then carrying out air floatation treatment on the harmless components to further remove residual oil, and delivering air floatation waste gas and air floatation waste liquid generated in the air floatation process to an incineration unit for incineration disposal;
(3) solid-liquid separation: and (3) performing solid-liquid separation on the harmless components treated in the step (2), conveying the filter residue with the water content of 60% after the solid-liquid separation to a sludge drying device in a workshop for drying, performing evaporation concentration treatment on the obtained high-salt-content wastewater after the water content is reduced to below 30%, conveying the evaporated condensed wastewater to a wastewater station for treatment, and performing outsourcing treatment on the evaporated salt residues.
In conclusion, the comprehensive treatment and recovery process for waste acid and waste alkali in the hazardous waste recovery industry, disclosed by the invention, can be used for treating and recovering industrial waste acid and waste alkali and waste acid and waste alkali generated in the hazardous article treatment process. The types of the waste acid and the waste alkali are divided by detecting the components of the waste acid and the waste alkali firstly, and then the waste acid and the waste alkali are respectively treated according to different types of the waste acid and the waste alkali. Wherein, waste acid and waste alkali with lower content of available components and poorer economy are neutralized, and a precipitator flocculant is added to convert pollution factors into harmless components; waste acid and waste alkali which can be separated and recovered according to the boiling point difference are recovered and used after being evaporated and concentrated; waste acid and waste alkali which have single components and contain resource elements are prepared into salt solution by adding auxiliary materials for recycling, and the waste acid and the waste alkali which can be used for other processes of hazardous waste recovery can be continuously used for relevant process of hazardous waste recovery after air floatation treatment. The invention provides a complete treatment scheme of waste acid and waste alkali aiming at the hazardous waste recovery industry, which can relieve the treatment pressure of waste, prevent secondary pollution, recycle resources and has great economic and environmental protection significance.
Claims (7)
1. A comprehensive treatment and recovery process for waste acid and waste alkali in hazardous waste recovery industry is characterized by comprising the following steps:
(1) waste acid and waste alkali classification: collecting industrial waste acid, waste alkali and comprehensive waste unit sorting waste acid and self-produced waste alkali generated after hazardous waste is cleaned, conveying the collected waste acid and self-produced waste alkali to a storage tank area and a corresponding bin position of a warehouse through a pump for storage, simultaneously respectively sampling and detecting incoming materials, dividing waste acid and waste alkali with lower content of available components and poorer economy into I-type waste acid and waste alkali according to detection results, dividing waste acid and waste alkali with impurities capable of being separated and recycled according to boiling point difference into II-type waste acid and waste alkali, dividing waste acid and waste alkali with single components and containing resource elements into III-type waste acid and waste alkali, and dividing waste acid and waste alkali which can be used for other processes of hazardous waste recovery after detection into IV-type waste acid and waste alkali;
(2) treating type I waste alkali: after residual oil in the I-type waste alkali subjected to classification treatment in the step (1) is removed through air floatation treatment, neutralizing the I-type waste alkali subjected to classification treatment in the step (1) and spraying acid and alkali;
(3) treating the type II waste alkali: filtering impurities of the II-type waste alkali subjected to classification treatment in the step (1) and then using the II-type waste alkali for acid-base spraying;
(4) treating III type waste alkali: filtering impurities of the III-class waste alkali classified and treated in the step (1) to generate solid finished salt;
(5) and IV, treating the waste alkali: after the IV-class alkali waste classified and treated in the step (1) is subjected to air floatation treatment to remove residual oil, the IV-class alkali waste is used for treating heavy metal-related waste in the recovery process of hazardous waste, adjusting the pH value in a wastewater station, treating highly toxic substances, treating silver-containing waste liquid and spraying acid and alkali in incineration tail gas;
(6) treating type I waste acid: carrying out air floatation pretreatment on the I-type waste acid subjected to classification treatment in the step (1), pumping the waste acid subjected to air floatation into a neutralization reaction kettle, adjusting the pH value by adding alkali or waste alkali, a precipitator, oxidants such as hydrogen peroxide and ferrous sulfate, a flocculating agent and the like, converting a pollution factor into harmless components, and then carrying out air floatation treatment to further remove residual oil;
(7) solid-liquid separation: and (4) performing solid-liquid separation on the harmless components treated in the step (6), and respectively treating separated waste liquid according to the content of pollutant factors: directly treating low-salt wastewater in a wastewater treatment station, performing evaporation concentration treatment on high-salt wastewater, sending evaporated condensed wastewater to the wastewater treatment station for treatment, and treating evaporated salt residues outside the factory;
(8) treating II type waste acid: removing solid particle impurities from the II-class waste acid subjected to classification treatment in the step (1) through a filter, and periodically collecting filter residues and then sending the filter residues to an incineration unit for incineration disposal;
(9) evaporation, concentration and recovery: conveying the filtrate obtained after treatment in the step (8) to a waste acid and alkali unit evaporation concentration device, heating by using steam to separate liquid impurities in the material from the material in a gas state, stopping heating after the concentration of the filtrate reaches a corresponding standard, cooling the concentrated filtrate by using a cooling system, and conveying the concentrated filtrate to a storage tank by using a pump to be stored after the quality requirement of a finished product acid is met;
(10) treating III waste acid: removing solid particle impurities from the III waste acid subjected to classification treatment in the step (1) through a filter, and periodically collecting filter residues and then sending the filter residues to an incineration unit for incineration disposal;
(11) preparing a salt solution: detecting the filtrate obtained after the treatment in the step (10), determining the type and the quantity of the added auxiliary materials according to the detection result, and adding related auxiliary materials into the reaction kettle according to the quantity through a metering system to perform chemical reaction with the raw materials so as to realize component change or impurity separation and form a salt solution or precipitate;
(12) solid-liquid separation of salt solution: carrying out fine processing such as evaporation, crystallization and drying on the salt product obtained after the treatment in the step (11) to prepare three liquid, semi-liquid or solid products, transporting the liquid product in a ton bucket, a tank car and the like according to the packaging requirements of customers, and selling the solid product after bagging;
(13) and IV, treating waste acid: and (3) removing residual oil from the IV-class waste acid subjected to classification treatment in the step (1) through air flotation treatment, and then using the IV-class waste acid for treatment of heavy metal-related waste, regulation of pH value in a wastewater station and comprehensive utilization of a catalyst in a hazardous waste recovery process.
2. A waste acid and waste alkali comprehensive treatment and recovery process for hazardous waste recovery industry according to claim 1, wherein the industrial waste acid and the comprehensive waste unit sorting waste acid and the self-produced waste alkali generated after the hazardous waste is cleaned and pumped to the storage tank area in the step (1) are transported by a tank car and pumped to the warehouse for transportation by a barrel.
3. The comprehensive treatment and recovery process for waste acid and waste alkali used in hazardous waste recovery industry according to claim 1, wherein the pre-air floatation treatment of the type I waste acid in step (6) is carried out to treat the air floatation waste gas and the air floatation waste liquid generated by the air floatation treatment of harmless components, and the air floatation waste gas and the air floatation waste liquid are sent to an incineration unit for incineration disposal.
4. A waste acid and waste alkali comprehensive treatment and recovery process for hazardous waste recovery industry according to claim 1, wherein in step (6), reaction waste gas and waste water generated by a reaction kettle in the waste acid and waste alkali neutralization process are evaporated, concentrated and noncondensable gas is sent to an acid and alkali spraying system in a workshop for treatment, filtered by activated carbon and discharged through an exhaust funnel.
5. The comprehensive treatment and recovery process of waste acid and waste alkali for hazardous waste recovery industry according to claim 1, wherein the water content of the filter residue obtained by solid-liquid separation in step (7) reaches 60%, the filter residue is sent to a sludge drying device in a workshop for drying, and after the water content is reduced to below 30%, the filter residue and the waste alkali are respectively treated according to the content of pollutant factors.
6. A waste acid and waste alkali comprehensive treatment and recovery process for hazardous waste recovery industry according to claim 1, wherein in step (9), acid gas generated in the concentration process enters a subsequent condensation system for condensation, non-condensable gas enters an acid and alkali spraying system in a workshop for treatment, then is filtered by activated carbon and discharged through an exhaust funnel, and condensed wastewater is sent to a wastewater treatment station for treatment.
7. A waste acid and waste alkali comprehensive treatment and recovery process for hazardous waste recovery industry according to claim 1, wherein in step (11), the salt solution is prepared by adding ammonium carbonate to waste sulfuric acid containing ammonium ions and adding calcium hydroxide to waste nitric acid containing heavy metal ions.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111908666A (en) * | 2020-08-28 | 2020-11-10 | 重庆立洋环保科技发展有限公司 | Pretreatment system for liquid hazardous waste |
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Application publication date: 20200623 |