CN219059129U

CN219059129U - Etching waste liquid treatment recovery unit

Info

Publication number: CN219059129U
Application number: CN202223285906.1U
Authority: CN
Inventors: 李嘉利
Original assignee: Shenzhen Didao Microelectronics Technology Co ltd
Current assignee: Shenzhen Didao Microelectronics Technology Co ltd
Priority date: 2022-12-08
Filing date: 2022-12-08
Publication date: 2023-05-23
Anticipated expiration: 2032-12-08

Abstract

The utility model discloses an etching waste liquid treatment and recovery device, which comprises an etching assembly line, wherein a water outlet of the etching assembly line is connected with a waste liquid storage tank through an etching waste water pipe and a spraying waste liquid pipe, and a liquid outlet of the waste liquid storage tank is sequentially connected with a Fenton degradation device, a UASB reactor, a bag filter, an ion exchange column, a waste water storage device and a coagulating sedimentation tank, and has the beneficial effects that: the material cost of adding alkaline solution required by removing hydrogen peroxide in the existing treatment process and the material cost of a larger amount of Fenton reagent required in the subsequent complex breaking reaction are effectively reduced by optimizing and effectively utilizing the hydrogen peroxide and the waste acid contained in the waste liquid; the recovery of the noble metals of molybdenum and niobium is completed while the metal ions of molybdenum and niobium in the waste liquid are removed efficiently, and the recycling of resources is realized.

Description

Etching waste liquid treatment recovery unit

Technical Field

The utility model relates to the technical field of etching waste liquid treatment, in particular to an etching waste liquid treatment and recovery device.

Background

In the electronics industry, the manufacture of printed circuit boards not only consumes large amounts of water and energy, but also produces chemicals that are harmful to the environment and human health. The etching waste liquid generated in the etching process is industrial waste water with higher copper content and higher pH value. The etching waste liquid seriously pollutes the environment, influences the survival of microorganisms in water, destroys the soil aggregate structure, influences the growth of crops, if the environment-friendly treatment cannot be reasonably carried out, on one hand, the serious waste of resources is caused, on the other hand, heavy metals are discharged and then permeate into the soil and a water source, and serious pollution and harm can be generated to the natural environment and the health of the people depending on the survival. The existing etching waste liquid treatment flow is sequentially divided into hydrogen peroxide removal, complexation breaking and metal ion flocculation precipitation, firstly, alkali liquor is added to remove hydrogen peroxide under the condition of stirring, then ferrous sulfate or Fenton reagent is added to realize complexation breaking, finally alkali liquor is added to adjust pH so as to enable the metal ion flocculation precipitation, but the hydrogen peroxide in the copper-molybdenum-niobium etching waste liquid is not effectively utilized in the treatment process in the prior art; and the copper-molybdenum-niobium etching waste liquid contains a large amount of organic acid, so that organic matters are difficult to thoroughly degrade by the Fenton method, and especially nitrogen-phosphorus organic compounds are difficult to degrade. Moreover, the work of recovering molybdenum-niobium metal is not found in the existing copper-molybdenum-niobium etching waste liquid treatment system.

Disclosure of Invention

The utility model aims to provide an etching waste liquid treatment and recovery device for solving the problems in the background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides an etching waste liquid treatment recovery unit, includes etching assembly line, waste liquid bin, fenton degradation ware, UASB reactor, pocket type filter, a plurality of ion exchange column, waste water reservoir and coagulating sedimentation tank, the outlet of etching assembly line passes through etching waste liquid pipe and spray waste liquid union coupling waste liquid bin, fenton degradation ware, UASB reactor, pocket type filter, ion exchange column, waste water reservoir and coagulating sedimentation tank are connected gradually to the liquid outlet of waste liquid bin, a plurality of ion exchange column establish ties or parallel connection each other.

Further, a feed inlet and a PH detector are arranged on the Fenton degradation device.

Further, a liquid pump and a flowmeter are arranged between the bag filter and the ion exchange column.

Further, a sampling port and a valve are arranged on the ion exchange column, and the ion exchange column is specifically an anion exchange resin column.

Furthermore, the UASB reactor is provided with a methane outlet and a drain pipe.

Further, the coagulating sedimentation tank is provided with a sedimentation outlet and a purified water outlet.

Compared with the prior art, the utility model has the beneficial effects that:

the material cost of adding alkaline solution required by removing hydrogen peroxide in the existing treatment process and the material cost of a larger amount of Fenton reagent required in the subsequent complex breaking reaction are effectively reduced by optimizing and effectively utilizing the hydrogen peroxide and the waste acid contained in the waste liquid;

the recovery of the noble metals of molybdenum and niobium is completed while the metal ions of molybdenum and niobium in the waste liquid are removed efficiently, and the recycling of resources is realized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a flow chart of the structure of the present utility model.

In the figure: 1. an etching assembly line; 2. an etching waste liquid pipe; 3. a spray waste liquid pipe; 4. a waste liquid storage tank; 5. a Fenton degradation device; 6. a UASB reactor; 7. a bag filter; 8. an ion exchange column; 9. a waste water reservoir; 10. and (5) a coagulating sedimentation tank.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1, in an embodiment of the present utility model, an etching waste liquid treatment recovery device includes an etching line 1, a waste liquid storage tank 4, a Fenton degradation device 5, a UASB reactor 6, a bag filter 7, a plurality of ion exchange columns 8, a waste water storage 9 and a coagulating sedimentation tank 10, wherein a water outlet of the etching line 1 is connected with the waste liquid storage tank 4 through an etching waste liquid pipe 2 and a spraying waste liquid pipe 3, a liquid outlet of the waste liquid storage tank 1 is sequentially connected with the Fenton degradation device 5, the UASB reactor 6, the bag filter 7, the ion exchange columns 8, the waste water storage 9 and the coagulating sedimentation tank 10, the ion exchange columns 4 are connected in series or in parallel, a feed inlet and a PH detector are arranged on the Fenton degradation device 5, a liquid pump and a flowmeter are arranged between the bag filter 7 and the ion exchange columns 8, a sampling port and a valve are arranged on the ion exchange columns 8, the ion exchange columns 8 are specifically an anion exchange resin column, the UASB reactor 6 is provided with a biogas outlet and a water outlet, and a purified water outlet.

Examples:

the etching liquid in the etching process line can be used as etching waste liquid for treatment after reaching the prescribed copper ion concentration, and deionized water is generally used for washing after the etching of the panel, so that the etching liquid on the glass panel after etching is washed cleanly. Therefore, etching waste liquid and waste liquid after spraying are generated in the whole etching production line 1, wherein the difference is that the concentration of the waste liquid after spraying is smaller than that of the etching waste liquid, the two waste liquids respectively enter a waste liquid storage tank 4 through an etching waste liquid pipe 2 and a spraying waste liquid pipe 3, are then conveyed into a Fenton degradation device 5, chemical oxygen demand COD and PH values of the waste liquid are obtained through an OPR and a PH detector, the amount of hydrogen peroxide and ferrous sulfate or additional acid which need to be added are calculated, and the waste liquid containing organic matters which are not completely decomposed, especially nitrogen and phosphorus organic matters after being degraded by the Fenton degradation device is conveyed to a UASB reactor 6 for the next biodegradation;

wherein the sludge generated in the UASB reactor is discharged through a sludge discharge outlet in the reactor and then dehydrated and compressed, and the generated biogas is conveyed through a biogas output port for aftertreatment. Through two-step degradation, the overall COD removal rate in the original waste liquid can exceed 90%. The content of molybdenum and niobium in the copper-molybdenum-niobium etching waste liquid accounts for 5-12% of the total content of copper-molybdenum-niobium. In a weakly acidic environment, molybdenum and niobium mainly exist in the form of heteropolyacid radicals, and the resin for adsorbing molybdenum-niobium anions cannot adsorb cations in wastewater. Thus, the wastewater after the COD removal process is passed through the bag filter 7 and then transferred to the anion exchange resin column, and the molybdenum niobate anions are adsorbed and separated. In the ion exchange process, the resin adsorption is saturated, so that a plurality of anion exchange resin columns are additionally arranged, and the operation of replacing saturated anion exchange resin is performed, and meanwhile, the control of opening and closing can be performed through a valve, so that the adsorption operation of wastewater is performed by the other anion exchange resin at the same time. The anion exchange resin may be of the type W304C, 201X 7 or D296. The saturated anion exchange resin can be thoroughly eluted by 15% ammonia water, and a regeneration solution (such as sodium sulfate solution, wherein the sodium sulfate solution can be purified water treated by the waste liquid treatment recovery device, and the purified water contains sodium sulfate with a certain concentration) is used for treatment, so that the resin can be regenerated and reused. The wastewater after adsorbing the molybdenum niobate anions is stored in a wastewater reservoir 9 and then transferred to a coagulating sedimentation tank 10. In this process, sodium hydroxide or potassium hydroxide is added as a pH adjustor and flocculant to flocculate and precipitate most of the iron, ferrous, copper ions. The purified water is discharged from the purified water outlet, and the sediment is discharged from the sediment outlet and then dehydrated and compressed.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model 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.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. The utility model provides an etching waste liquid treatment recovery unit, includes etching assembly line (1), waste liquid bin (4), fenton degradation ware (5), UASB reactor (6), bag filter (7), a plurality of ion exchange column (8), waste water reservoir (9) and coagulating sedimentation tank (10), its characterized in that: the waste liquid storage tank (4) is connected through etching waste liquid pipe (2) and spraying waste liquid pipe (3) to the outlet of etching assembly line (1), the liquid outlet of waste liquid storage tank (4) connects gradually Fenton degradation ware (5), UASB reactor (6), bag filter (7), ion exchange column (8), waste water reservoir (9) and coagulating sedimentation tank (10), a plurality of ion exchange column (8) are established ties or parallel connection each other.

2. The etching waste liquid treatment and recovery device according to claim 1, wherein: and a feed inlet and a pH detector are arranged on the Fenton degradation device (5).

3. The etching waste liquid treatment and recovery device according to claim 1, wherein: a liquid pump and a flowmeter are arranged between the bag filter (7) and the ion exchange column (8).

4. The etching waste liquid treatment and recovery device according to claim 1, wherein: the ion exchange column (8) is provided with a sampling port and a valve, and the ion exchange column (8) is specifically an anion exchange resin column.

5. The etching waste liquid treatment and recovery device according to claim 1, wherein: the UASB reactor (6) is provided with a biogas outlet and a drain pipe.

6. The etching waste liquid treatment and recovery device according to claim 1, wherein: the coagulating sedimentation tank (10) is provided with a sedimentation outlet and a purified water outlet.