CN109626695B - System and method for treating mother liquor of wastewater evaporation process - Google Patents
System and method for treating mother liquor of wastewater evaporation process Download PDFInfo
- Publication number
- CN109626695B CN109626695B CN201910073225.2A CN201910073225A CN109626695B CN 109626695 B CN109626695 B CN 109626695B CN 201910073225 A CN201910073225 A CN 201910073225A CN 109626695 B CN109626695 B CN 109626695B
- Authority
- CN
- China
- Prior art keywords
- gas
- unit
- water
- treatment
- mother liquor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/08—Thin film evaporation
-
- 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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/465—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electroflotation
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention discloses a treatment system of mother liquor in a wastewater evaporation process, which comprises a film evaporation system, a low-temperature carbonization system, a mixed salt separation system, an RCO low-temperature catalytic oxidation system and a control system, wherein an outlet of the film evaporation system is connected with an inlet of the low-temperature carbonization system, a solid discharge outlet of the low-temperature carbonization system is connected with an inlet of the mixed salt separation system, and a gas discharge outlet of the low-temperature carbonization system is connected with an inlet of the RCO low-temperature catalytic oxidation system. The invention also discloses a method for treating the mother liquor of the wastewater evaporation process. The method can effectively remove COD in the mother liquor and effectively recover salts in the mother liquor, so that the salts in the mother liquor are recycled and harmless.
Description
Technical Field
The invention relates to the technical field of concentrated solution treatment, in particular to a harmless recycling treatment system and method for mother liquor in a wastewater evaporation process.
Background
The chemical industry often uses evaporation processes to treat wastewater, which often results in the production of large amounts of evaporation mother liquor that is difficult to treat due to its high salt and high COD properties. Currently, for the treatment of evaporation mother liquor, the most common methods include two methods: one method is to realize the near zero emission of waste liquid through the natural evaporation of an evaporation pond, and simultaneously generate solid miscellaneous salt in the evaporation process, but at present, because the salt is difficult to determine, the salt is generally used as dangerous solid waste to be buried and incinerated, so the method wastes resources and pollutes the environment; the other method is to adopt a method combining physical chemistry and biochemical chemistry to treat the evaporation mother liquor, but the characteristics of high salt and high COD of the mother liquor can generate inhibition effect on the survival of microorganisms in the biochemical treatment under the common condition, so that the treatment efficiency of the process is not high, and the discharge reaching the standard cannot be realized.
In view of the above problems, there is an urgent need to find a method for effectively treating evaporation mother liquor, which can efficiently remove organic substances in the mother liquor, effectively recover salts in the mother liquor, and make the salts in the mother liquor resource and harmless.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for treating mother liquor in a wastewater evaporation process, which can effectively remove COD in the evaporation mother liquor and effectively recover salts in the mother liquor, so that the salts in the mother liquor are recycled and harmless.
According to one aspect of the invention, a treatment system of mother liquor of a wastewater evaporation process is provided, which comprises a membrane evaporation system, a low-temperature carbonization system, a mixed salt separation system, an RCO low-temperature catalytic oxidation system and a control system, wherein an outlet of the membrane evaporation system is connected with an inlet of the low-temperature carbonization system, a solid discharge outlet of the low-temperature carbonization system is connected with an inlet of the mixed salt separation system, a gas discharge outlet of the low-temperature carbonization system is connected with an inlet of the RCO low-temperature catalytic oxidation system,
the control system comprises an automatic control unit and a manual control unit, the automatic control unit adopts a distributed I/O mode, a main CPU and the distributed I/O are communicated through PROFIBUS-DP, the manual control unit comprises a power on/off machine operating button on a thin film evaporation system, a low-temperature carbonization system, a mixed salt separation system and an RCO low-temperature catalytic oxidation system,
the low-temperature carbonization system comprises a feeding unit, a combustion chamber, a discharging unit, a condensing unit, a non-condensable gas processing unit, an oil-water separation unit, a cooling unit and a water processing unit, wherein,
the inlet of the feeding unit is connected with the outlet of the thin film evaporation system through the inlet of the low-temperature carbonization system, and the outlet of the feeding unit is connected with the inlet 1 of the combustion chamber;
the outlet 1 of the combustion chamber is connected to the inlet of the discharge unit, and the solid material treated by the combustion chamber is sent to the discharge unit;
the outlet of the discharge unit is connected to the inlet of the mixed salt separation system via the solid discharge outlet of the low temperature carbonization system;
the outlet 2 of the combustion chamber is connected to the inlet of the condensation unit, feeding the gases produced in the combustion chamber to the condensation unit;
the outlet 1 of the condensation unit is connected to the inlet of the non-condensable gas processing unit, and the non-condensable gas produced in the condensation unit is sent to the non-condensable gas processing unit;
the outlet 2 of the condensation unit is connected with the inlet 1 of the oil-water separation unit, and the liquid oil-water mixture generated in the condensation unit is sent to the oil-water separation unit;
the outlet 1 of the non-condensable gas processing unit is connected to the inlet of the RCO low-temperature catalytic oxidation system through the gas exhaust outlet of the low-temperature carbonization system or to the inlet 2 of the combustion chamber, and the gas processed in the non-condensable gas processing unit is sent to the RCO low-temperature catalytic oxidation system or to the combustion chamber;
the outlet 2 of the non-condensable gas treatment unit is connected to the inlet 2 of the oil-water separation unit, and the liquid produced in the non-condensable gas treatment unit is sent to the oil-water separation unit;
the outlet 1 of the oil-water separation unit is connected with the water treatment unit, and water separated in the oil-water separation unit is sent to the water treatment unit for treatment;
the outlet 2 of the oil-water separation unit is connected to the inlet 1 of the combustion chamber, and the precipitated sludge produced in the oil-water separation unit is sent to the combustion chamber;
the outlet 1 of the water treatment unit is connected with the inlet of the cooling unit, and the water treated by the water treatment unit is sent to the cooling unit for cooling, and the cooling water is used for system recycling;
the outlet 2 of the water treatment unit is connected to the inlet 1 of the combustion chamber and the precipitated sludge produced in the water treatment unit is fed to the combustion chamber.
In some embodiments, the feeding unit may include a feeding bin, a first screw conveyor located at the bottom of the feeding bin, and a first airlock located at a discharge end of the first screw conveyor, the first screw conveyor includes a toothed-edge crushing screw conveyor on which a weighing module is disposed and a feeding preheating screw conveyor, which are sequentially associated, and on which a spiral groove of a U-shaped heat exchange jacket is disposed.
In some embodiments, the outfeed unit may comprise an outfeed bin, a second screw conveyor at the bottom of the outfeed bin, the second screw conveyor having a cooling jacket disposed thereon, and a second airlock chamber at the feed end of the second screw conveyor.
According to another aspect of the present invention, there is provided a method for treating mother liquor of an evaporation process of wastewater, comprising the steps of:
1) when the control system is in an automatic state, a ready signal is sent to the automatic control unit to control the mother liquor of the wastewater evaporation process to be treated, the mother liquor is evaporated by the thin film evaporation system to reduce the water content in the mother liquor, and the evaporated water is recycled to the production line;
2) leading the mother liquor treated in the step 1) into a low-temperature carbonization system, wherein the low-temperature carbonization system comprises a feeding unit, a combustion chamber, a discharging unit, a condensing unit, a non-condensable gas treatment unit, an oil-water separation unit, a cooling unit and a water treatment unit, and the following steps are carried out:
a, feeding mother liquor to a combustion chamber through a feeding unit, heating the mother liquor to 550-650 ℃ by using natural gas under an oxygen-free condition, wherein the retention time is not more than 48 minutes, generating separated solid and gas, introducing the gas into a condensing unit, and introducing the solid into a discharging unit;
b, introducing the gas in the step a into a condensing unit, wherein one part of the gas is condensed into a liquid oil-water mixture, and the other part of the gas is non-condensable gas;
c, introducing the non-condensable gas in the step b into a non-condensable gas treatment unit for treatment, removing residual water in the gas through a demister, introducing the gas into a NaOH water washing tank to remove residual inorganic chloride and SO2、SO3And the gas-liquid separator and the electric demisting tank are used for removing solid particles and liquid drops with the diameter larger than or equal to 0.3um mixed in the gas-liquid separator, and the separated non-condensable gas is divided into a treatment gas and a regeneration gas: treating the treatment gas by a molecular sieve adsorption tower; heating the regenerated gas to about 300 ℃ required by molecular sieve regeneration through a heat exchanger, then flowing into an adsorption tower, stripping from top to bottom to obtain concentrated components in a bed layer, feeding the damp and hot regenerated gas into a condenser to condense liquid, separating the liquid in a gas-liquid separator, and mixing with the treatment gas before entering the adsorption tower, thus completing the whole cycle process;
d, introducing the oil-water mixture obtained in the step b and the liquid separated in the step 3) into an oil-water separation unit, treating by using an electric air floatation flocculation precipitation method to recover the condensed oil on the upper layer into an oil storage tank, sending flocculate with larger specific gravity into a combustion chamber for retreatment, and allowing the separated water to enter a water treatment unit for treatment;
e, water generated by the oil-water separation unit is sent into the water treatment unit, after the water is added with medicine and flocculated, pollutants in the sewage form precipitated sludge through the inclined plate sedimentation tank and then are sent into the combustion chamber for continuous treatment, and the treated water enters the cooling unit and is used for system spray cooling to enable the water to be recycled.
3) B, guiding the solid generated in the step a into a mixed salt separation system through a discharge unit, and separating carbon and related salts through step-by-step treatment;
4) guiding the gas treated by the noncondensable gas treatment unit in the step c into an RCO low-temperature catalytic oxidation system for treatment, and discharging the gas after reaching the standard; or the treated gas is led into the combustion chamber to realize waste heat recovery.
In the step 3), the solid generated in the step a is led into a mixed salt separation system through a discharge unit, and carbon is separated out through water dissolving and filtering and is used as an adsorbent or fuel for recycling; the remaining mixed salt solution utilizes the procedures of chemical conversion, separation, salting out, freezing and the like according to the characteristics of the salt types and the like as required, so that the separated and purified related salts reach the national or industrial standard.
In particular, the entire treatment process is carried out under oxygen-free conditions.
The invention has the beneficial effects that:
1) the method has high treatment efficiency, can effectively remove organic matters in the evaporation mother liquor, and realizes harmless treatment of salts in the mother liquor;
2) the method can realize the separation and purification of the mixed salt, so that the separated and purified salt is recycled and commercialized;
3) the treatment method of the invention has lower cost and can generate a plurality of additional values, for example, the recycled carbon can be used as an adsorbent; the collected condensed oil can be used as fuel; the isolated salt may be produced as a product.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only illustrative and are not intended to limit the present application.
The treatment system of the mother liquor of the wastewater evaporation process comprises a film evaporation system, a low-temperature carbonization system, a mixed salt separation system, an RCO low-temperature catalytic oxidation system and a control system, wherein an outlet of the film evaporation system is connected with an inlet of the low-temperature carbonization system, a solid discharge outlet of the low-temperature carbonization system is connected with an inlet of the mixed salt separation system, a gas discharge outlet of the low-temperature carbonization system is connected with an inlet of the RCO low-temperature catalytic oxidation system,
the control system comprises an automatic control unit and a manual control unit, the automatic control unit adopts a distributed I/O mode, a main CPU and the distributed I/O are communicated through PROFIBUS-DP, the manual control unit comprises a power on/off machine operating button on a thin film evaporation system, a low-temperature carbonization system, a mixed salt separation system and an RCO low-temperature catalytic oxidation system,
the low-temperature carbonization system comprises a feeding unit, a combustion chamber, a discharging unit, a condensing unit, a non-condensable gas processing unit, an oil-water separation unit, a cooling unit and a water processing unit, wherein,
the inlet of the feeding unit is connected with the outlet of the thin film evaporation system through the inlet of the low-temperature carbonization system, and the outlet of the feeding unit is connected with the inlet 1 of the combustion chamber;
the outlet 1 of the combustion chamber is connected to the inlet of the discharge unit, and the solid material treated by the combustion chamber is sent to the discharge unit;
the outlet of the discharge unit is connected to the inlet of the mixed salt separation system via the solid discharge outlet of the low temperature carbonization system;
the outlet 2 of the combustion chamber is connected to the inlet of the condensation unit, feeding the gases produced in the combustion chamber to the condensation unit;
the outlet 1 of the condensation unit is connected to the inlet of the non-condensable gas processing unit, and the non-condensable gas produced in the condensation unit is sent to the non-condensable gas processing unit;
the outlet 2 of the condensation unit is connected with the inlet 1 of the oil-water separation unit, and the liquid oil-water mixture generated in the condensation unit is sent to the oil-water separation unit;
the outlet 1 of the non-condensable gas processing unit is connected to the inlet of the RCO low-temperature catalytic oxidation system through the gas exhaust outlet of the low-temperature carbonization system or to the inlet 2 of the combustion chamber, and the gas processed in the non-condensable gas processing unit is sent to the RCO low-temperature catalytic oxidation system or to the combustion chamber;
the outlet 2 of the non-condensable gas treatment unit is connected to the inlet 2 of the oil-water separation unit, and the liquid produced in the non-condensable gas treatment unit is sent to the oil-water separation unit;
the outlet 1 of the oil-water separation unit is connected with the water treatment unit, and water separated in the oil-water separation unit is sent to the water treatment unit for treatment;
the outlet 2 of the oil-water separation unit is connected to the inlet 1 of the combustion chamber, and the precipitated sludge produced in the oil-water separation unit is sent to the combustion chamber;
the outlet 1 of the water treatment unit is connected with the inlet of the cooling unit, and the water treated by the water treatment unit is sent to the cooling unit for cooling, and the cooling water is used for system recycling;
the outlet 2 of the water treatment unit is connected to the inlet 1 of the combustion chamber and the precipitated sludge produced in the water treatment unit is fed to the combustion chamber.
The following is a detailed description of the various elements:
1) feed unit
The feeding unit comprises a feeding bin, a first spiral conveyer and a first airlock, the first spiral conveyer is positioned at the bottom of the feeding bin, the first airlock is positioned at the discharge end of the spiral conveyer, the first spiral conveyer comprises a toothed edge crushing spiral conveyer and a feeding preheating spiral conveyer which are sequentially connected, a weighing module is arranged on the toothed edge crushing spiral conveyer, and a U-shaped heat exchange jacket spiral groove is formed in the feeding preheating spiral conveyer. In the example, the mother liquor processed by the thin film evaporation system is fed into the feeding unit and then is fed into the feeding bin, and is fed into the feeding preheating screw conveyor after being crushed and weighed by the toothed edge crushing screw conveyor with the weighing module at the bottom of the feeding bin; the feeding preheating screw conveyer is provided with a spiral groove with a U-shaped heat exchange jacket, mother liquor in the spiral groove is indirectly preheated to 85-92 ℃ through circulating deionized water subjected to heat exchange through a discharging and chimney, then the mother liquor enters a hopper, and then enters a rotary paddle type airlock for avoiding air mixing, so that the amount of the mother liquor entering a combustion chamber is adjusted.
2) Combustion chamber
As a core unit, the combustion chamber utilizes natural gas to heat the mother liquor from the feeding unit to 550-650 ℃, and the maximum residence time can reach 48 minutes to evaporate and decompose organic matters in the mother liquor so as to realize the separation of solid and gas.
3) Discharge unit
The ejection of compact unit includes ejection of compact feed bin, is located the second screw conveyer of the bottom of ejection of compact feed bin and the second airlock room (avoiding the air to get into the combustion chamber) that is located the feed end of second screw conveyer, be provided with cooling jacket on the second screw conveyer. The ejection of compact unit is handled the solid that generates through the water spray cooling back with the combustion chamber, leads to ejection of compact feed bin through ejection of compact screw conveyer, and then the leading-in mixed salt system of separating.
4) Condensing unit
After the gas generated in the combustion chamber is condensed and cooled by the condensing unit, part of the gas is condensed to form a liquid oil-water mixture, and the liquid oil-water mixture enters the oil-water separation unit. Meanwhile, a small part of the volume of the vapor cannot be condensed, which is non-condensable gas, and the part of the gas enters the non-condensable gas processing unit.
5) Non-condensable gas processing unit
Removing residual water in the non-condensable gas from the condensation unit by a demister, introducing the non-condensable gas into a NaOH water washing tank to remove residual inorganic chloride and SO in the non-condensable gas2、SO3And the solid particles and the liquid drops with the diameter more than or equal to 0.3um mixed in the water are removed through a gas-liquid separator and an electric defogging tank. The separated noncondensable gas is divided into a treatment gas and a regeneration gas: treating gas, wherein after most of residual pollutants in the treating gas are removed through a molecular sieve adsorption tower and a filtering device, the residual pollutants enter an RCO low-temperature catalytic oxidation system, are subjected to RCO low-temperature catalytic combustion, and are finally discharged to the atmosphere after reaching the standard or the treated gas is introduced into a combustion chamber to realize waste heat recovery; the regenerated gas flows through the heat exchanger and is heated to the temperature required by the regeneration of the molecular sieve, then flows into the adsorption tower, is stripped from the top to the bottom to obtain concentrated components in the bed layer, the damp and hot regenerated gas enters the condenser again to be condensed to obtain liquid, and then the liquid is separated in the gas-liquid separator and is mixed with the treated gas before entering the adsorption tower, so that the whole circulation process is completed.
6) Oil-water separation unit
In the oil-water separation unit, the liquids generated by the condensation unit and the non-condensable gas treatment unit enter an electric air flotation sedimentation tank for electrocoagulation air flotation separation. After air flotation, sedimentation and separation, the condensed oil on the upper layer of the air flotation tank is guided into an oil storage tank, the generated flocculation precipitation sludge is guided back to a combustion chamber for treatment, and the separated water enters a water treatment unit.
7) Water treatment unit
And water generated by the oil-water separation unit is sent to the water treatment unit, after the water is added with the chemical and flocculated, formed precipitated sludge can be periodically sent to the combustion chamber for continuous treatment, and the water treated by the water treatment unit is sent to the cooling unit.
8) Cooling unit
And in the cooling unit, the water treated by the water treatment unit enters a water cooling tower for cooling and is used for system recycling.
By adopting the treatment system, the mother liquor of the wastewater evaporation process is treated by the thin film evaporation system, so that the water content in the mother liquor is reduced, a good condition is provided for entering a low-temperature carbonization system, and the evaporated water is recycled to a production line. Then the gas generated by the low-temperature carbonization system is introduced into RCO low-temperature catalytic oxidation combustion, the gas is discharged to atmosphere after reaching the standard or the treated gas is introduced into a combustion chamber, the waste heat recovery is realized, and the solid generated by the treatment (the main components are mixed salt and carbon) is sent to a mixed salt separation system: firstly, dissolving slag salt and carbon, then recycling the carbon through a filtering device, and separating and purifying different salts by using a physical and chemical method through a mixed salt water solution, and specifically analyzing according to the specific situation of the types of the mixed salt.
It will be apparent to those skilled in the art that various modifications and improvements can be made to the embodiments of the present invention without departing from the inventive concept of the present application, which falls within the scope of the present application.
Claims (3)
1. A treatment method of waste water evaporation process mother liquor is characterized by comprising the following steps:
1) when the control system is in an automatic state, a ready signal is sent to the automatic control unit to control the mother liquor of the wastewater evaporation process to be treated, the mother liquor is evaporated by the thin film evaporation system to reduce the water content in the mother liquor, and the evaporated water is recycled to the production line;
2) leading the mother liquor treated in the step 1) into a low-temperature carbonization system, wherein the low-temperature carbonization system comprises a feeding unit, a combustion chamber, a discharging unit, a condensing unit, a non-condensable gas treatment unit, an oil-water separation unit, a cooling unit and a water treatment unit, and the following steps are carried out:
a. the mother liquor is sent to a combustion chamber through a feeding unit, the mother liquor is heated to 550-650 ℃ by natural gas under the condition of no oxygen, the retention time is not more than 48 minutes, solid and gas are generated, the gas is led into a condensing unit, and the solid is led into a discharging unit;
b. b, introducing the gas in the step a into a condensing unit, wherein one part of the gas is condensed into a liquid oil-water mixture, and the other part of the gas is non-condensable gas;
c. b, introducing the non-condensable gas in the step b into a non-condensable gas treatment unit for treatment, removing residual water in the gas through a demister, introducing the gas into an NaOH water washing tank to remove residual inorganic chloride, SO2 and SO3, removing solid particles and liquid drops with the diameter being more than or equal to 0.3um in the gas-liquid separator through an electric demisting tank, and separating the separated non-condensable gas into a treatment gas and a regeneration gas: treating the treatment gas by a molecular sieve adsorption tower; heating the regenerated gas to 300 ℃ required by molecular sieve regeneration through a heat exchanger, then flowing into an adsorption tower, stripping from top to bottom to obtain concentrated components in a bed layer, feeding the damp and hot regenerated gas into a condenser to condense liquid, separating the liquid in a gas-liquid separator, and mixing with the treated gas before entering the adsorption tower to finish the whole circulation process;
d. leading the oil-water mixture in the step b and the liquid separated in the step c into an oil-water separation unit, treating by using an electric air floatation flocculation precipitation method to recover the condensed oil on the upper layer into an oil storage tank, sending flocculate with larger specific gravity into a combustion chamber for retreatment, and feeding the separated water into a water treatment unit for treatment;
e. water generated by the oil-water separation unit is sent into a water treatment unit, after dosing flocculation, pollutants in the sewage form precipitated sludge through an inclined plate sedimentation tank and then are sent into a combustion chamber for continuous treatment, and the treated water enters a cooling unit and is used for systematic spray cooling to enable the water to be recycled;
3) b, guiding the solid generated in the step a into a mixed salt separation system through a discharge unit, and separating carbon and related salts through step-by-step treatment;
4) guiding the gas treated by the noncondensable gas treatment unit in the step c into an RCO low-temperature catalytic oxidation system for treatment, and discharging the gas after reaching the standard; or the treated gas is led into the combustion chamber to realize waste heat recovery.
2. The method according to claim 1, wherein in the step 3), the solid generated in the step a is introduced into a mixed salt separation system through a discharge unit, and carbon is separated through water dissolving and filtering and is recycled as an adsorbent or fuel; the remaining mixed salt solution utilizes the procedures of chemical conversion, separation, salting out and freezing according to the characteristics of the salt types and needs, so that the separated and purified related salts reach the national or industrial standard.
3. The method of claim 1, wherein the entire process is carried out in the absence of oxygen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910073225.2A CN109626695B (en) | 2019-01-25 | 2019-01-25 | System and method for treating mother liquor of wastewater evaporation process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910073225.2A CN109626695B (en) | 2019-01-25 | 2019-01-25 | System and method for treating mother liquor of wastewater evaporation process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109626695A CN109626695A (en) | 2019-04-16 |
| CN109626695B true CN109626695B (en) | 2021-10-01 |
Family
ID=66063796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910073225.2A Active CN109626695B (en) | 2019-01-25 | 2019-01-25 | System and method for treating mother liquor of wastewater evaporation process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109626695B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103145288A (en) * | 2013-03-15 | 2013-06-12 | 湖南百利工程科技股份有限公司 | Method for processing and recovering hazardous substance in liquid waste in caprolactam production |
| CN203411452U (en) * | 2013-08-14 | 2014-01-29 | 湖州宜可欧环保科技有限公司 | Sludge carbonization and carbon recovery device for oil refinery |
| CN106044908A (en) * | 2016-06-29 | 2016-10-26 | 清华大学 | Evaporation treatment process of high-salinity organic waste water |
| CN106746419A (en) * | 2017-03-07 | 2017-05-31 | 盘锦宁泰能源科技有限公司 | A kind of oily sludge industrially scalable pyrolysis treatment systems and method |
| CN107601742A (en) * | 2017-10-27 | 2018-01-19 | 湖南绿网环保科技有限责任公司 | A kind of processing system and method for high salt high concentrated organic wastewater |
| CN209702464U (en) * | 2019-01-25 | 2019-11-29 | 北京水裕清环保科技有限公司 | The processing system of waste water evaporation technology mother liquor |
-
2019
- 2019-01-25 CN CN201910073225.2A patent/CN109626695B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103145288A (en) * | 2013-03-15 | 2013-06-12 | 湖南百利工程科技股份有限公司 | Method for processing and recovering hazardous substance in liquid waste in caprolactam production |
| CN203411452U (en) * | 2013-08-14 | 2014-01-29 | 湖州宜可欧环保科技有限公司 | Sludge carbonization and carbon recovery device for oil refinery |
| CN106044908A (en) * | 2016-06-29 | 2016-10-26 | 清华大学 | Evaporation treatment process of high-salinity organic waste water |
| CN106746419A (en) * | 2017-03-07 | 2017-05-31 | 盘锦宁泰能源科技有限公司 | A kind of oily sludge industrially scalable pyrolysis treatment systems and method |
| CN107601742A (en) * | 2017-10-27 | 2018-01-19 | 湖南绿网环保科技有限责任公司 | A kind of processing system and method for high salt high concentrated organic wastewater |
| CN209702464U (en) * | 2019-01-25 | 2019-11-29 | 北京水裕清环保科技有限公司 | The processing system of waste water evaporation technology mother liquor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109626695A (en) | 2019-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101467204B1 (en) | Method of integration of concentration-dehydration and aerobic air-drying of sewage sludge | |
| CN107399876B (en) | A kind of processing method of high ammonia-nitrogen wastewater | |
| CN106495384A (en) | The technique that a kind of utilization organic contamination high-salt wastewater prepares industrial purified salt | |
| KR101368459B1 (en) | Food waste effluent anaerobic advanced treatment system | |
| CN104230124B (en) | Coal chemical industry wastewater zero emission technique and specific equipment thereof | |
| CN212597897U (en) | Flying dust washing processing system | |
| CN203593682U (en) | Stack gas condensate water treating device | |
| CN108117208B (en) | Treatment method and treatment device for alkaline residue waste liquid | |
| CN103880238A (en) | Device and method for treating condensed water of flue gas | |
| KR101168691B1 (en) | Method and system for treating supernatant of food waste | |
| CN105461102A (en) | Treatment method of smoke washing wastewater | |
| CN111112296A (en) | Resource utilization treatment method for industrial waste salt | |
| CN109437350B (en) | Chemical three-waste comprehensive treatment system and method | |
| CN109626695B (en) | System and method for treating mother liquor of wastewater evaporation process | |
| KR102083441B1 (en) | Waste water treatment method containing organic solvent | |
| CN209702464U (en) | The processing system of waste water evaporation technology mother liquor | |
| CN112759195A (en) | Treatment device and treatment process for high ammonia nitrogen wastewater | |
| CN210085181U (en) | Processing apparatus for removing acrylonitrile in carbon fiber production wastewater | |
| CN111115933A (en) | Flameless torch type ultra-clean discharge process for high-ammonia nitrogen wastewater containing VOCs | |
| CN108117209B (en) | Comprehensive treatment method and device for alkaline residue waste liquid | |
| CN110877900A (en) | Mixed salt recycling treatment method and system | |
| CN114684953B (en) | Method and device for treating ethylene waste alkali liquor | |
| CN115259518A (en) | System and method for treating percolate concentrated solution | |
| CN110981156B (en) | Oil sludge three-phase separation method based on alkali modification | |
| CN213506212U (en) | Wastewater hardness removal device and desulfurization wastewater zero-discharge treatment system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |