RU148896U1 - DEVICE FOR ELECTROFLOTOMEMBRANE CLEANING OF WASTE WATERS OF PRODUCTION OF PRINTED CIRCUIT BOARDS CONTAINING ALCOHOLIC PHOTO RESIST WITH NEUTRALIZATION OF PURIFIED WATERS - Google Patents

Abstract

Device for electroflotomembrane wastewater treatment for the manufacture of printed circuit boards containing an alkaline photoresist, comprising a housing with an electroflotation chamber and a membrane electrolyzer in the form of an anode and two side cathode chambers and a cathode chamber centered inside the anode chamber, characterized in that the device is provided pipelines connecting the electroflotation chamber to the side cathode chambers of the membrane electrolyzer.

Description

The proposed utility model relates to devices for electroflotomembrane wastewater treatment for the production of printed circuit boards containing a water-alkaline photoresist.

A device is known comprising a housing with a membrane electrolyzer and an electroflotation chamber located therein [RF Patent No. 2067555 C1, IPC C02F 1/46, C02F 1/465. The wastewater treatment method for the production of printed circuit boards containing a water-alkaline photoresist type SPF-VSC, and a device for its implementation / Kolesnikov VA, Varaksin C.O., Kamynina L.; declared 04/28/1993; publ. 10/10/1996].

The disadvantage of this device is that the purified water is highly aggressive due to their increased acidity.

It is known that the device containing the housing, selected as a prototype, is equipped with an electroflotation chamber and a membrane electrolyzer in the form of an anode and two lateral cathode chambers and a cathode chamber centered inside the anode chamber [Utility Model Patent of the Russian Federation No. 133119 U1, IPC C02F 1/46. A device for wastewater treatment for the production of printed circuit boards containing a water-alkaline photoresist SPF-VSC / Ilyin V.I., Kolesnikov V.A .; declared 03/28/2013; publ. 10/10/2013. Bull. No. 28].

The disadvantage of this device is that purified water is a highly aggressive medium due to their high acidity.

The technical problem and the result, which is directed by the claimed device for electroflotomembrane wastewater production of printed circuit boards containing a water-alkaline photoresist, is the neutralization of acid purified water, which eliminates the formation of a highly aggressive environment.

The technical result is achieved by the fact that the device includes a housing with an electroflotation chamber and a membrane electrolyzer in the form of an anode and two side cathode chambers and a cathode chamber located centrally inside the anode chamber. New, according to the proposed utility model, is that the device is equipped with pipelines connecting the electroflotation chamber to the side cathode chambers of the membrane electrolyzer.

The proposed utility model device is illustrated in the figure, in which in FIG. 1 is a top view.

The device consists of a housing 1, separated by an overflow baffle 2 into a membrane electrolyzer 16 and an electroflotation chamber 12. The membrane electrolyzer is made in the form of an anode and two side cathode chambers and a cathode chamber located centrally inside the anode chamber. The cathode chambers are separated from the anode by cation exchange membranes 7. Lamellar cathodes 9 are installed in the cathode chambers, and lamellar anodes 8 are installed in the anode.

In the lateral cathode chambers there are nozzles for introducing 11 acid purified water and output 10 neutralized purified water.

In the electroflotation chamber, sets of horizontal comb plate electrodes 3 (cathodes and anodes) are placed, and there are nozzles 5 for removing acid purified water.

The device is equipped with pipelines 17 connecting the electroflotation chamber to the side cathode chambers of the membrane electrolyzer.

From the opposite end of the electroflotation chamber from the membrane electrolyser there is a foam collector 13. In the upper part of the device located above the water level, there is a foam collecting device 6, driven by a gear motor 14.

The device operates as follows. The alkaline waste water with a pH = 10-11, comprising vodoschelochnoy photoresist is supplied through pipes 4 to the anode compartment of the membrane electrolysis cell, wherein under the influence of the current load on the anodes 8, the anode electrochemical reaction takes place discharge hydroxyl ions OH ^- to form oxygen gas and hydrogen ions H ⁺ , due to which the pH of the wastewater decreases (acidifies) to pH = 2-4, at which the formation of particles of the dispersed phase of the photoresist and their flotation with oxygen bubbles proceed.

Further, acidic wastewater containing the dispersed phase of the photoresist is poured through the septum 2 and enters the electroflotation chamber 12, where under the influence of gases (hydrogen and oxygen) released during electrolysis of water at the electrodes 3 (cathodes and anodes), the process of separation of wastewater and particles of the dispersed phase of the photoresist, forming a foam product on the surface of the purified water.

Acidic water, purified from particles of the dispersed phase of the photoresist, with a pH of 2-4 flows from the electroflotation chamber 12 through the nozzles 5 and through pipelines 17 connecting the electroflotation chamber to the cathode chambers of the membrane electrolyzer, enters them through the nozzles 11.

In the cathode chambers of the membrane electrolyzer at the cathodes 9, an electrochemical reaction of the discharge of water molecules proceeds with the formation of gaseous hydrogen and hydroxyl ions OH ^- .

The presence of cation exchange membranes ensures the separation of the products of electrode reactions, as a result of which the pH of the acidic purified water is neutralized in the side cathode chambers to 6.0-7.5 due to the chemical interaction of hydrogen ions H ⁺ with hydroxyl ions OH ^- . The neutralized purified water is discharged from the installation through the nozzles 10.

The dispersed phase of the photoresist in the form of a foam product that has surfaced on the surface of the water being cleaned in the anode chamber of the membrane electrolyzer and the electroflotation chamber is removed by the foam collecting device 6 into the foam collector 13 and then removed from the device through the pipe 15.

The elimination of the formation of a highly aggressive medium is ensured by the fact that acidic purified waters after extraction of the dispersed phase of the photoresist undergo an additional purification stage - neutralization due to the interaction of hydrogen ions with hydroxyl ions formed in acidic purified water as a result of the electrochemical cathodic reaction of the discharge of water molecules.

The technical result in solving the problem is achieved due to the fact that the device is equipped with pipelines connecting the electroflotation chamber to the side cathode chambers of the membrane electrolyzer, which allows the neutralization of acidic treated water.

The proposed design of a device for electroflotomembrane wastewater production of printed circuit boards containing a water-alkaline photoresist, eliminates the formation of a highly aggressive environment.

Claims (1)

A device for electroflotomembrane wastewater treatment for the manufacture of printed circuit boards containing an alkaline photoresist, comprising a housing with an electroflotation chamber and a membrane electrolyzer in the form of an anode and two side cathode chambers and a cathode chamber centered inside the anode chamber, characterized in that the device is provided pipelines connecting the electroflotation chamber to the side cathode chambers of the membrane electrolyzer.

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