CN111204926A

CN111204926A - Process and equipment for treating waste emulsified waste liquid

Info

Publication number: CN111204926A
Application number: CN202010050234.2A
Authority: CN
Inventors: 张长安; 谢建平; 杨海洪; 彭芳
Original assignee: Henan Yingweitai Environmental Technology Co Ltd
Current assignee: Henan Yingweitai Environmental Technology Co Ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-05-29

Abstract

The invention discloses a process and equipment for treating waste emulsified waste liquid, which relate to the technical field of waste emulsified waste liquid treatment and comprise the following steps: A. oil-water separation, multi-effect reduced pressure distillation, micro-nano bubble catalytic oxidation of C and ozone, D, MBBR treatment and E, RO/AC treatment. Aiming at the practical situation that the characteristics and the sources of the waste emulsion are different, the invention adds proper oil/water separation and an improved multi-effect evaporation pretreatment process in a waste emulsion treatment system to change the waste emulsion with unstable pollutant types and concentrations into sewage with relatively stable and low pollutant concentrations. And then the B/C ratio is rapidly improved by adopting ozone micro-nano bubble catalytic oxidation, so that the catalyst has biodegradability.

Description

Process and equipment for treating waste emulsified waste liquid

Technical Field

The invention relates to the technical field of waste emulsified waste liquid treatment, in particular to a process and equipment for treating waste emulsified waste liquid.

Background

The industries related to metal and alloy material processing, such as electromechanics, machining, pumping industry, automobile processing, metallurgy, forging, casting and the like, need to use various lubricants. Metalworking lubricants are classified into oil-based and water-based 2 general categories. The oil-based lubricant is formed by adding various additives into mineral oil, animal and vegetable oil or a mixture of the mineral oil and the animal and vegetable oil. The water-based lubricant comprises soluble oil, semi-synthetic liquid and synthetic liquid.

The main components of lubricants used in metalworking processes include oils, emulsifiers and additives. The cutting fluid is mainly water-based lubricant. Waste liquid generated after use often contains harmful substances such as waste soap solution, emulsified oil/water, hydrocarbon/water mixture, emulsion (paste), cutting agent, coolant, lubricant, and wire drawing agent, and is putrefactive due to bacterial action, and the waste emulsion is determined as a dangerous waste by the country.

The treatment of waste emulsions first requires the destruction of the original stable emulsified state, and the common emulsion breaking processes include: electro-sedimentation method; an ultrasonic method; a heating method; forced filtration; standing, floating or settling separation; centrifugal separation; pressurized air float process, etc. The method aims at the process that certain emulsion can be used, and the universality is not strong.

Demulsification, after separation of oil phase (organic matter), the treatment of waste water is usually carried out by: physicochemical and biochemical treatment; physicochemical + adsorption; materialization and membrane filtration. Because the emulsified waste liquid contains a large amount of heavy metal pollutants and suspended matters besides organic pollutants, and the normal operation of physicochemical, biochemical and membrane filtration processes is often interfered, the input and treatment cost of the treatment of the waste emulsified liquid are always high up to now.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a process and equipment for treating waste emulsified liquid, and solves the problems of low process universality and high investment and treatment cost in the conventional waste emulsified liquid treatment.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme:

a process and equipment for treating waste emulsified waste liquid are characterized by comprising the following steps:

A. oil-water separation: firstly, performing oil-water separation on waste emulsion in a micro-nano air flotation mode, and separating an unstable oil/water system and easily extracted organic light components from water by utilizing the characteristic of large specific surface area of micro-nano bubbles to create conditions for multi-effect reduced pressure distillation;

B. multi-effect reduced pressure distillation: heavy metal pollutants and solid suspended matters in the waste emulsion can be removed through distillation, and the light organic components in gas phase are separated through the technical treatment of circulating steam, so that the decomposition and degradation difficulty of COD (chemical oxygen demand) and COD (chemical oxygen demand) of distilled water can be greatly reduced, and the waste emulsions with different sources and different performances are changed into easily-treated wastewater with low pollutant concentration and stable performance;

C. catalytic oxidation of ozone micro-nano bubbles: the method comprises the following steps of treating the waste emulsion distilled water by ozone in a micro-nano bubble form, increasing the solubility and the retention time of the ozone in the water by using the micro-nano bubbles, inducing the generation of hydroxyl radicals with stronger oxidability by using the surface energy released during the rupture by using the higher specific surface energy of the micro-nano bubbles, enhancing the decomposition capacity of the ozone on organic matters, and using a catalyst in a targeted manner, so as to improve the concentration of the hydroxyl radicals and increase the decomposition speed of the organic matters;

D. MBBR treatment: carrying out MBBR biofilm treatment on the waste liquid after catalytic oxidation;

E. and (3) RO/AC treatment: and finally, performing RO or activated carbon adsorption treatment on the waste liquid.

Optionally, the catalytic oxidation time in step C is less than 3 hours.

(III) advantageous effects

The invention provides a process and equipment for treating waste emulsified waste liquid, which has the following beneficial effects:

(1) aiming at the practical situation that the characteristics and the sources of the waste emulsion are different, the invention adds proper oil/water separation and an improved multi-effect evaporation pretreatment process in a waste emulsion treatment system to change the waste emulsion with unstable pollutant types and concentrations into sewage with relatively stable and low pollutant concentrations.

(2) The invention uses special catalyst to improve the decomposition speed of the ozone micro-nano bubbles to the organic pollutants by more than 30 times; the B/C of the pyrolysis water is rapidly increased from 0.02 to more than 0.35, so that the pyrolysis water has biodegradability.

(3) The invention uses RO to remove inorganic salt in the wastewater and uses active carbon to remove organic pollutants which are difficult to decompose finally, so that the pyrolysis wastewater can be reused.

Drawings

FIG. 1 is a flow chart of the present invention.

FIG. 2 is a schematic diagram of the present invention.

Fig. 3 is a schematic view of the holding box of the present invention.

FIG. 4 is a schematic cross-sectional view taken along the line A-A of FIG. 3 according to the present invention.

Fig. 5 is an enlarged view of the invention at a in fig. 4.

Fig. 6 is a perspective view of the card strip of the present invention.

In the figure: 1. a housing; 2. a fixed box; 3. a knob; 4. a cover plate; 5. a handle; 6. inserting plates; 7. an activated carbon mesh; 8. a rotating shaft; 9. a drive bevel gear; 10. a driven bevel gear; 11. a screw; 12. clamping the strip; 13. a slider; 14. a chute; 15. a card slot; 16. a sealing groove; 17. and (5) sealing rings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

In the present invention, unless otherwise expressly specified or limited, the terms "disposed," "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected or detachably connected; may be a mechanical connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The invention provides a process and equipment for treating waste emulsified liquid waste, which are shown in figure 1 and are characterized by comprising the following steps:

A. oil-water separation: firstly, oil-water separation is carried out on waste emulsion in a micro-nano air flotation mode, an unstable oil/water system and easily extracted organic light components are separated from water by utilizing the characteristic of large specific surface area of micro-nano bubbles, conditions are created for the following multi-effect reduced pressure distillation, and the oil/water separation effect of micro-nano bubble air flotation is very good for waste organic/water mixtures in chemical and pharmaceutical industries;

C. catalytic oxidation of ozone micro-nano bubbles: the ozone is used for treating the waste emulsion distilled water in a micro-nano bubble form, the solubility and the retention time of the ozone in the water are increased by using the micro-nano bubbles, meanwhile, the specific surface energy of the micro-nano bubbles is high, the surface energy released during cracking induces hydroxyl free radicals with stronger oxidability, the decomposition capacity of the ozone on organic matters is enhanced, and a catalyst is used in a targeted manner, so that the concentration of the hydroxyl free radicals is improved, the decomposition speed of the organic matters is increased, the concentration of the organic matters in the waste emulsion distilled water can be reduced by more than 80 percent through the micro-nano catalytic oxidation of the ozone and the catalytic oxidation within 3 hours, the BOD/COD of the pyrolysis water can be rapidly increased from 0.02 to more than 0.35, and the condition of biological treatment is achieved;

D. MBBR treatment: MBBR biofilm treatment is carried out on the waste liquid after catalytic oxidation, so that the treatment cost of pyrolysis water is reduced;

E. and (3) RO/AC treatment: finally, performing RO or activated carbon adsorption treatment on the waste liquid, wherein the treatment is selected according to different sources of the waste emulsion, and RO is adopted when the concentration of inorganic salt in the waste emulsion is higher; when the concentration of the inorganic salt is lower, activated carbon is adopted for adsorption, and the concentrated solution does not need to be treated.

As an optional technical scheme of the invention: the catalytic oxidation time in the step C is within 3 hours.

The invention also provides equipment for treating waste emulsified waste liquid, which comprises a shell 1, wherein a liquid outlet pipe at the bottom end of the shell 1 is fixedly connected with a fixed box 2, two ends of the front side surface of the fixed box 2 are respectively provided with a knob 3, the two knobs 3 are symmetrically arranged, a cover plate 4 is arranged between the two knobs 3, the front side surface of the fixed box 2 is provided with a slot matched with the cover plate 4, the middle part of the front side surface of the cover plate 4 is fixedly connected with a handle 5, the rear side surface of the cover plate 4 is fixedly connected with a plug board 6, the plug board 6 is fixedly connected with an activated carbon net 7, and the activated carbon net 7 is matched with the liquid outlet pipe, so that the activated carbon net 7 can adsorb;

one side of the knob 3 close to the fixed box 2 is fixedly connected with one end of a rotating shaft 8, the other end of the rotating shaft 8 extends into an installation cavity formed in the fixed box 2, the rotating shaft 8 is rotatably fixed in the fixed box 2 through a bearing, the structure is reasonable, the rotating shaft 8 is convenient to rotate stably, one end of the rotating shaft 8 positioned in the fixed box 2 is fixedly connected with a driving bevel gear 9, one side of the driving bevel gear 9 is engaged and connected with a driven bevel gear 10, the driven bevel gear 10 is rotatably fixed in the fixed box 2 through a bearing, the driven bevel gear 10 is convenient to rotate stably, the middle part of the driven bevel gear 10 is provided with a screw rod 11, the middle part of the driven bevel gear 10 is provided with a threaded hole matched with the screw rod 11, the screw rod 11 penetrates through the driven bevel gear 10 and is in threaded connection with the driven bevel, offer on the inner wall of fixed case 2 with slider 13 cooperation spout 14 that uses, slider 13 and spout 14 sliding connection, the one end of card strip 12 sets up to the inclined plane, apron 4's both ends all offer with the draw-in groove 15 of card strip 12 adaptation, in the one end of card strip 12 was worn out fixed case 2 and was stretched into draw-in groove 15, apron 4's trailing flank edge has seted up seal groove 16, seal groove 16 is embedded to have sealing washer 17, the reinforcing leakproofness.

The working principle is as follows:

when the activated carbon net 7 needs to be detached, the two knobs 3 are sequentially rotated, the knobs 3 drive the driving bevel gear 9 to rotate through the rotating shaft 8, the driving bevel gear 9 drives the driven bevel gear 10 to rotate, the driven bevel gear 10 is in threaded connection with the screw rod 11, the screw rod 11 drives the clamping strip 12 to do linear motion far away from the clamping groove 15, the clamping strip 12 is separated from the clamping groove 15, and the activated carbon net 7 can be detached through the handle 5.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. A process and equipment for treating waste emulsified waste liquid are characterized by comprising the following steps:

B. multi-effect reduced pressure distillation: heavy metal pollutants and solid suspended matters in the waste emulsion can be removed through distillation, and the light organic components in gas phase are separated through the technical treatment of circulating steam, so that the decomposition and degradation difficulty of COD (chemical oxygen demand) and COD (chemical oxygen demand) of distilled water can be reduced, and the waste emulsion with different sources and different performances is changed into easily-treated wastewater with low pollutant concentration and stable performance;

2. The process of treating waste emulsified liquid waste according to claim 1, wherein:

the catalytic oxidation time in step C is less than 3 hours.