CN110902886A - Method for directly curing cutting waste liquid - Google Patents
Method for directly curing cutting waste liquid Download PDFInfo
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- CN110902886A CN110902886A CN201911238029.2A CN201911238029A CN110902886A CN 110902886 A CN110902886 A CN 110902886A CN 201911238029 A CN201911238029 A CN 201911238029A CN 110902886 A CN110902886 A CN 110902886A
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- waste liquid
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Water Treatment By Sorption (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a method for directly solidifying and dewatering cutting waste liquid, in particular to a method for directly solidifying and dewatering the cutting waste liquid without pretreatment. The invention solves the problems of complex process, long flow and time consumption, large equipment investment, incomplete treatment or substandard treatment, large sludge yield and the like of the conventional cutting waste liquid treatment technology, namely, the complicated steps of conventional chemical pretreatment such as emulsion breaking, air flotation/precipitation, advanced oxidation and the like, biochemistry, membrane concentration, evaporation and the like are omitted, and the generation amount of solid waste is minimized.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a method for directly curing cutting waste liquid.
Background
The disposal of industrial high concentration waste liquid is very difficult and complicated, the requirement of simple incineration for incineration equipment is very high, and the incineration equipment is damaged by single incineration or mixed incineration with other solids, so that the disposal of waste liquid in the current market, especially in Jiangzhe Hu and Zhu triangular area, is very expensive, and often 4000 yuan/ton or more. For cutting waste liquid, because the cutting waste liquid is rich in oil and surfactant (high in chemical oxygen demand), the cutting waste liquid cannot be crystallized and is more difficult to treat, and because the cutting waste liquid produced by enterprises every day is not large in amount (dozens of kilograms to hundreds of kilograms), many treating units are unwilling to accept in consideration of economic benefits. The prior treatment or reduction technology and method for cutting waste liquid generally adopt several technologies or combinations, namely, oil separation, demulsification, advanced oxidation, flocculation (air flotation or sedimentation), biochemistry, adsorption, membrane concentration, evaporation (including negative pressure low temperature evaporation) and the like. For example, the invention patent application publication No. CN104556515A (cutting waste liquid treatment method) adopts the following techniques: low-temperature multi-effect evaporation, and treating the condensed water by air floatation, micro-electrolysis, Fenton oxidation, catalytic oxidation and activated carbon adsorption; the invention patent application publication No. CN106830422A (a short-range pretreatment method of cutting waste liquid) adopts processes of Fenton advanced oxidation, flocculation precipitation and the like; invention patent application publication no: CN106007070A (a treatment method of high-concentration water-based cutting waste liquid) adopts the processes of dilution, Fenton advanced oxidation, flocculation precipitation and the like; invention patent application publication no: CN105753260A (treatment system and treatment process of cutting waste liquid), which adopts photocatalytic oxidation, anaerobic fermentation, MBR filtration treatment, etc. The common processing sheets have the problems of complex process, large occupied area of equipment, poor or incomplete processing effect and the like.
Disclosure of Invention
The invention aims to provide a method for directly curing cutting waste liquid, which is convenient to operate, quick to treat, good in effect and small in equipment floor area, so that the defects of the prior art in treating the cutting waste liquid can be overcome.
In order to solve the technical problems, the invention adopts the following scheme:
a method for directly curing cutting waste liquid is characterized by comprising the following steps: step one, stirring, mixing and reacting cutting waste liquid and a solid powdery composite material to obtain a solid mixture; step two, conveying the solid mixture into a heating cavity with temperature control for dehydration; step three, collecting the dehydrated solid waste; condensing and collecting the removed water vapor, and discharging the condensed water into a wastewater collection pool or into a reverse osmosis membrane system for purification; and step four, recycling the purified water produced by the reverse osmosis membrane system, and returning the condensed water discharged into the wastewater collection pool to the previous step one for re-solidification.
Preferably, in the step one, the cutting waste liquid is water-based or oil-based.
Preferably, in the first step, the solid powder composite material includes a partially cross-linked hydrophilic powder material or/and an oleophilic powder material.
Preferably, the hydrophilic powder material is composed of at least one of modified starch, modified cellulose, modified chitin, a polyacrylic acid system, a polyacrylonitrile system, a polyacrylamide system and modified polyvinyl alcohol.
Preferably, the partially cross-linked hydrophilic material is ionic or non-ionic.
Preferably, the oleophylic powder material is composed of at least one of oleophylic rubber, polyolefin, organosilicon, polyacrylate, polyurethane, or powder materials coated by the materials.
Preferably, the heating mode of the temperature-controlled cavity in the second step is one or more of radiation heating, electric heating, gas heating, fuel oil heating, steam heating and hot oil heating.
Preferably, in the second step, the temperature control range of the temperature-controlled cavity is 35-200oC。
Preferably, in the second step, the cavity controlled by the temperature is under normal pressure or negative pressure.
Preferably, in the second step, when the heating mode of the temperature-controlled cavity is radiation, the radiation source is an electromagnetic wave capable of generating resonance with water molecules.
Preferably, the electromagnetic wave is microwave or infrared.
Preferably, in the second step, the heating mode of the temperature-controlled cavity is that the heat pump unit adds negative pressure to vacuum.
Preferably, in the second step, the dehydration adopts a compound dehydration mode, namely, the radiation heating and the electric heating, the gas heating, the fuel oil heating, the steam heating and the hot oil heating are simultaneously used.
The process can also be used for the direct solidification treatment of machine and equipment maintenance and cleaning waste liquid, chemical or pharmaceutical high COD waste liquid, chemical nickel waste liquid produced by electroplating and zinc-nickel alloy waste liquid.
The method comprises the following steps: 1. mixing the solid powder composite material with the cutting waste liquid for rapid curing reaction to obtain a solid mixture; 2. conveying the solidified solid mixture into a negative-pressure temperature control rotary drum chamber or other types of cavities for dehydration by radiation or other heating modes, and collecting condensed water, wherein the other heating modes comprise electric heating, gas heating, fuel oil heating, steam heating, hot oil heating and the like; 3. and (3) discharging the collected low-concentration condensed water into a wastewater collection tank to be treated together with other wastewater or enter a reverse osmosis membrane system to be concentrated to obtain a concentrated solution, wherein the water yield is more than or equal to 90%, the produced water of the reverse osmosis system can be directly recycled, and the concentrated solution returns to the step (1) to be solidified again. By this treatment, a solid is obtained which is about 10% or less, contains almost no moisture, is elastic, is coated with contaminants by an elastomer, and has a high fuel value because 30 to 70% of the solid is organic. The technical method has the advantages of high processing speed (about 2-6 hours), low energy consumption, closed whole system and no escape of toxic and harmful gases. The resulting condensate of very low concentration can be treated with other waste water. If the water after the condensed water passes through the reverse osmosis system can be directly reused for production, the conductivity is less than or equal to 100 mu s/cm, the condensed water of the reverse osmosis system can be solidified, and finally, only less than or equal to 10 percent of solid with high easily-disposed combustion value is produced, and the production amount of the solid depends on the solid content of the cutting waste liquid. The technical method can be applied to not only cutting waste liquid, but also other industrial waste liquid, such as machine and equipment maintenance cleaning waste liquid, high COD chemical or pharmaceutical waste liquid, chemical nickel waste liquid which is difficult to treat in electroplating, zinc-nickel alloy waste liquid and the like.
The invention provides a process method for quickly and directly solidifying cutting waste liquid, which comprises the steps of mixing and reacting solid powder composite material and the cutting waste liquid to obtain a solid mixture, conveying the solid mixture to a cavity with radiation or other heating modes for dehydration, and finally obtaining elastic solid almost containing no moisture. The removed water is condensed to obtain condensed water, the condensed water is treated together with other waste water or enters a reverse osmosis membrane system for concentration, the produced water can be recycled, and the concentrated water returns to the front for solidification.
The solid powder composite material comprises a partially crosslinked hydrophilic material or/and an oleophylic material, and the preferred partially crosslinked hydrophilic material is composed of at least one of the following materials: modified starch, modified cellulose, modified chitin, polyacrylic acid system, polyacrylonitrile system, polyacrylamide system, modified polyvinyl alcohol and the like. These partially crosslinked hydrophilic materials may be ionic or non-ionic. While a preferred lipophilic material is one consisting of at least one of the following materials: lipophilic rubber, polyolefin, organosilicon, polyacrylate, polyurethane, or powder material coated by these materials.
The solid mixture dehydration process method adopts electromagnetic radiation which can generate resonance, namely vibration and rotation, on water molecules, preferably microwaves and infrared rays, and can also adopt other heating modes for dehydration, such as electric heating, gas heating, fuel oil heating, steam heating, hot oil heating and the like.
The preferred control temperature in the chamber is 35-200 deg.CoC, and the pressure is normal pressure or negative pressure, preferably negative pressure.
The method for directly curing the cutting waste liquid can be used for preliminarily solidifying the cutting waste liquid, and then dehydrating and reducing the cutting waste liquid in a radiation or other heating mode to obtain the solid coated with the high polymer, almost contains no moisture and has a high combustion value.
The process method can also be used for directly curing other industrial waste liquid with high treatment cost at present, such as machine and equipment maintenance and cleaning waste liquid, chemical or pharmaceutical waste liquid with high chemical oxygen demand, chemical nickel waste liquid produced by electroplating, zinc-nickel alloy waste liquid and the like.
Advantageous effects
Compared with the prior art, the method for directly curing the cutting waste liquid has the following advantages:
(1) the process method is simple and direct, does not have fussy and unstable pretreatment, and does not produce a large amount of sludge or slurry with high water content which needs further drying treatment.
(2) The invention produces low solids (typically less than 10% depending on the solids content of the effluent itself), is light, contains little moisture, and has a high fuel value.
(3) The invention has high cost performance, and the treatment cost of the cutting waste liquid is far lower than the treatment cost of the outside commission of the current enterprises.
(4) The invention has fast processing speed, and the processing time from liquid to solid is 2-6 hours.
(5) The solid produced by the invention can not absorb water any more, so the storage and the transportation are simplified and convenient.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, 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.
The embodiment of the invention provides a method for directly curing cutting waste liquid, which comprises the steps of mixing and reacting a powdery solid composite material with the cutting waste liquid to obtain a low-corrosivity solid mixture, and then dehydrating the solid mixture by radiation resonance or other heating modes to obtain a solid residue almost containing no moisture.
The powdery solid composite material comprises a hydrophilic material or/and an oleophilic material, preferably a partially cross-linked hydrophilic material consisting of at least one of the following materials: modified starch, modified cellulose, modified chitin, polyacrylic acid system, polyacrylonitrile system, polyacrylamide system, modified polyvinyl alcohol and the like. These partially crosslinked hydrophilic materials may be ionic or non-ionic; while a preferred lipophilic material is one consisting of at least one of the following materials: lipophilic rubber, polyolefin, organosilicon, polyacrylate, polyurethane, or powder material coated by these materials.
The heating dehydration can be realized by radiation dehydration or other heating methods, such as electric heating, gas heating, fuel oil heating, steam heating, hot oil heating, etc., and the temperature of the heating cavity is preferably controlled to be 35-200 deg.CoC, and preferably a negative pressure is used. If radiation dehydration is used, preferably microwave or infrared is used.
The removed condensed water can be treated with other waste water if an enterprise has a waste water treatment facility, or a reverse osmosis system is adopted for concentration, the produced water is recycled, and the concentrated water is returned to the step 1 for solidification treatment.
Example 1:
taking 1 liter of cutting waste liquid with the conductivity =45000 mu s/cm, the pH =7 and the surface with a layer of floating oil of about 2mm and 35 grams of solid powdery composite material consisting of 30 grams of modified starch and 5 grams of oleophylic rubber powder, and mechanically stirring, mixing and reacting for about 10-30 minutes to obtain a solid mixed reaction product. Conveying the solid mixed reaction product into a rotatable radiation cavity with negative pressure and temperature controlled at 60-100 deg.CoAnd C, dehydrating the mixture by infrared radiation for about 1.5 to 2.5 hours to finally obtain 85 g of solid residue.
Example 2:
taking 1 liter of cutting waste liquid with the conductivity =7500 mu s/cm, the pH =7 and the surface having a layer of floating oil with the diameter of about 1mm, mechanically stirring, mixing and reacting with 30 g of solid powdery composite material consisting of 25 g of modified polyvinyl alcohol and 5 g of polypropylene powder for about 10-30 minutes to obtain a solid mixed reaction product, then putting the solid mixed reaction product into a rotatable radiation cavity with the negative pressure of the cavity and the temperature controlled at 60-100 DEG CoAnd C, dehydrating the mixture by infrared radiation for about 2 to 3 hours to finally obtain 62 g of solid residue.
While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (14)
1. A method for directly curing cutting waste liquid is characterized by comprising the following steps: step one, stirring, mixing and reacting cutting waste liquid and a solid powdery composite material to obtain a solid mixture; step two, conveying the solid mixture into a heating cavity with temperature control for dehydration; step three, collecting the dehydrated solid waste; condensing and collecting the removed water vapor, and discharging the condensed water into a wastewater collection pool or into a reverse osmosis membrane system for purification; and step four, recycling the purified water produced by the reverse osmosis membrane system, and returning the condensed water discharged into the wastewater collection pool to the previous step one for re-solidification.
2. The method for directly curing the cutting waste liquid according to claim 1, wherein: in the first step, the cutting waste liquid is water-based or oil-based.
3. The method for directly curing the cutting waste liquid according to claim 1, wherein: in the first step, the solid powder composite material comprises a partially cross-linked hydrophilic powder material or/and a lipophilic powder material.
4. The method for directly curing the cutting waste liquid according to claim 3, wherein: the hydrophilic powder material is composed of at least one of modified starch, modified cellulose, modified chitin, a polyacrylic acid system, a polyacrylonitrile system, a polyacrylamide system and modified polyvinyl alcohol.
5. The method for directly curing the cutting waste liquid according to claim 4, wherein: the partially crosslinked hydrophilic material is ionic or non-ionic.
6. The method for directly solidifying the cutting waste liquid according to claim 3, wherein: the oleophylic powder material is composed of at least one of oleophylic rubber, polyolefin, organic silicon, polyacrylate, polyurethane or powder materials coated by the materials.
7. The method for directly curing the cutting waste liquid according to claim 1, wherein: and in the second step, the heating mode of the temperature-controlled cavity is one or more of radiation heating, electric heating, gas heating, fuel oil heating, steam heating or hot oil heating.
8. The method for directly curing the cutting waste liquid according to claim 7, wherein: in the second step, the temperature control range of the temperature-controlled cavity is 35-200oC。
9. The method for directly curing the cutting waste liquid according to claim 7, wherein: in the second step, the cavity body controlled by the temperature is under normal pressure or negative pressure.
10. The method for directly curing the cutting waste liquid according to claim 7, wherein: in the second step, when the heating mode of the temperature-controlled cavity is radiation, the radiation source is electromagnetic wave capable of generating resonance with water molecules.
11. The method for directly curing the cutting waste liquid according to claim 10, wherein: the electromagnetic wave is microwave or infrared ray.
12. The method for directly curing the cutting waste liquid according to claim 7, wherein: in the second step, the heating mode of the temperature-controlled cavity is that the heat pump unit adds negative pressure to vacuum.
13. The method for directly curing the cutting waste liquid according to claim 7, wherein: in the second step, the dehydration adopts a compound dehydration mode, namely, the radiation heating and the combination of the electric heating, the gas heating, the fuel oil heating, the steam heating and the hot oil heating are simultaneously used.
14. Use of the method according to any one of claims 1 to 13, wherein: the method is used for directly solidifying and treating the waste liquid of machine and equipment maintenance and cleaning, the chemical or pharmaceutical high COD waste liquid, the chemical nickel waste liquid produced by electroplating or the zinc-nickel alloy waste liquid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911238029.2A CN110902886A (en) | 2019-12-06 | 2019-12-06 | Method for directly curing cutting waste liquid |
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| CN201911238029.2A CN110902886A (en) | 2019-12-06 | 2019-12-06 | Method for directly curing cutting waste liquid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114057332A (en) * | 2020-08-03 | 2022-02-18 | 昆山顺峰净化设备科技有限公司 | Electroplating wastewater treatment device |
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