CN211255580U - Processing system of resin waste water - Google Patents

Abstract

The utility model relates to a wastewater treatment system, concretely relates to resin waste water's processing system is related to. In the prior art, most of treatment methods for acid-containing wastewater adopt a chemical neutralization precipitation method, cannot realize the reutilization of waste acid and has higher treatment cost; in addition, the atmospheric distillation of the aqueous exhaust gas solution makes it difficult to separate the aqueous formaldehyde solution. To the defects in the prior art, the utility model provides a resin production wastewater treatment system with high recovery efficiency and low treatment cost. The utility model discloses a wastewater treatment system, including collecting pit, filtration equipment, diffusion dialysis system and pressurization distillation system, collecting pit, filtration equipment, diffusion dialysis system and pressurization rectification system link to each other in proper order by the pipeline. The utility model discloses a processing system of waste water because the cost is lower and can retrieve formaldehyde and hydrochloric acid in the waste water, has consequently realized satisfying the environmental protection requirement when the resource recycles, has good social economic benefits.

Description

Processing system of resin waste water

Technical Field

The utility model relates to a wastewater treatment system, concretely relates to resin waste water's processing system is related to.

Background

A large amount of waste water is produced in the resin production process, and the waste water has the following characteristics: contains formaldehyde and hydrochloric acid with higher concentration and has certain recovery value. The direct discharge of such waste water causes pollution to the environment ecology and causes serious harm to the health of people around. According to the current national emission standard, the highest emission concentration of formaldehyde is 3mg/L, and the pH value is required to be 6-9. Therefore, the wastewater must be treated to be qualified for discharge.

The domestic treatment method for acid-containing wastewater mostly adopts a chemical neutralization precipitation method, and the method has the advantages of small investment and simple process; the method has the disadvantages that the acid in the wastewater can not be recycled, and a large amount of alkali is consumed in the neutralization process, so that the resource waste is caused, and the treatment cost is high. The recovery of the gas dissolved in the waste water is usually carried out by a normal pressure rectification method, the rectification process has both substance transfer and chemical reaction, and is a complex process, and under normal pressure, because the relative volatility of formaldehyde and water is close to 1, the separation is difficult to be carried out by the normal pressure rectification method.

SUMMERY OF THE UTILITY MODEL

To contain among the prior art acid wastewater treatment method with high costs and can not retrieve and contain the defect that formaldehyde waste water ordinary pressure can not effective rectification recovery, in order to reduce cost and realize retrieving, the utility model provides a processing system of resin waste water that recovery efficiency is high, the treatment cost is lower.

The utility model discloses a processing system of resin waste water, including collecting pit, filtration equipment, diffusion dialysis system and pressurization rectification system, collecting pit, filtration equipment, diffusion dialysis system and pressurization rectification system link to each other in proper order by the pipeline.

For the treatment system of the resin production wastewater, the diffusion dialysis system comprises an acid-resistant pump, a flow meter, a diffusion dialyzer and a recovery tank, the diffusion dialyzer comprises a diffusion dialysis anion homogeneous membrane, and the pressurized rectification system comprises a pressurized rectification column and a recovery tank.

The utility model discloses a processing system of resin waste water, because the cost is lower and can retrieve formaldehyde and hydrochloric acid in the waste water, satisfied the environmental protection requirement when consequently having realized resource recycling, had good social and economic benefits.

Drawings

FIG. 1 is a schematic view of a system for treating resin production wastewater.

Detailed Description

The drawings in the embodiments of the present invention will be combined to form a preferred embodiment of the present invention, rather than to form a complete embodiment of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in figure 1, the treatment system for the resin production wastewater comprises a collecting tank 1, a filtering device 2, a diffusion dialysis system 5 and a pressurized rectification system 7, wherein the collecting tank 1, the filtering device 2, the diffusion dialysis system 5 and the pressurized rectification system 7 are connected in sequence through pipelines.

For the resin production wastewater treatment system, the diffusion dialysis system 5 comprises an acid-resistant pump 3, a flow meter 4, a diffusion dialyzer 9 and a recovery tank 6, the diffusion dialyzer 9 comprises a diffusion dialysis anion homogeneous membrane 10, and the pressurized rectification system 7 comprises a pressurized rectification column 8 and a recovery tank 6.

The utility model discloses a resin waste water's processing system's principle as follows: the wastewater is stored in a collecting tank 1, then enters a filtering device 2 for filtering suspended matters, then enters a diffusion dialysis system 5 for recycling hydrochloric acid, then enters a pressure rectification system 7 for recycling formaldehyde, and finally the treated liquid is discharged after reaching the standard. The diffusion dialysis system 5 adopts a dialysis principle, and is divided into a dialysis chamber and a diffusion chamber by an anion homogeneous membrane 10, when waste acid liquid and receiving liquid (tap water) are respectively introduced into two sides of the anion homogeneous membrane 10, the concentration of free acid at the waste acid liquid side is far higher than that at the water side, and due to the existence of concentration gradient, the free acid in the waste acid permeates into the diffusion chamber, but the membrane has selective permeability, so that each ion cannot pass through with equal opportunity. Firstly, the anion membrane skeleton is positively charged, and has the characteristic of attracting negatively charged hydrated ions and repelling positively charged hydrated ions in the solution, so under the action of concentration difference, anions on the waste acid side are attracted and smoothly enter one side of water through the membrane pore channel; meanwhile, ions with positive charges can be carried in the waste liquid according to the requirement of electroneutrality, and because the hydration radius ratio of H + is small, H + can preferentially pass through the membrane, so that acid in the waste liquid can be separated out. Because of adopting the countercurrent operation, consequently can improve permeation efficiency to greatly reduced waste liquid outlet free acid concentration, still can adjust the flow of waste liquid and running water through the flowmeter simultaneously, control waste liquid outlet free acid concentration. The principle of the pressurized rectifying system 7 is as follows: under the condition of pressurization, the temperature of the system is increased, the hydration reaction of formaldehyde moves towards the dehydration direction, the concentration of formaldehyde in the formaldehyde aqueous solution is increased, and the higher the temperature, the higher the rate of the dehydration reaction is compared with the vaporization rate of formaldehyde in the formaldehyde aqueous solution, the higher the relative volatility of formaldehyde-water can be increased, for example, the relative volatility of formaldehyde-water is close to 2.8 at 140 ℃, so that the pressurized rectification system can solve the separation problem of formaldehyde and water.

Compared with the prior art, the beneficial effects of the utility model are that: the cost is low, and the formaldehyde and the hydrochloric acid in the wastewater can be recovered, so that the environmental protection requirement is met while the resource is recycled, and the method has good social and economic benefits.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (1)

1. A processing system of resin waste water which characterized in that: include by collecting pit (1), filtration equipment (2), diffusion dialysis system (5) and pressurization rectifying system (7) that the pipeline links to each other in proper order, wherein diffusion dialysis system (5) including acid-proof pump (3), flowmeter (4), diffusion dialyzer (9) and accumulator (6) that the pipeline connects gradually, flowmeter (4) set up the both sides at diffusion dialyzer (9), diffusion dialyzer (9) including diffusion dialysis anion homogeneous phase membrane (10), pressurization rectifying system (7) including pressurization rectifying column (8) and accumulator (6).

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