RU138577U1 - DEVICE FOR WASTE WATER TREATMENT FOR PRODUCTION OF PRINTED CIRCUIT BOARDS CONTAINING ALCOHOLIC PHOTO RESIST SPF-VSC - Google Patents

Abstract

A device for wastewater treatment for the production of printed circuit boards containing the SPF-VS photoresist, comprising a housing with an electrolyzer in the form of an anode and two side cathode chambers and an electroflotation chamber, characterized in that the device is equipped with an additional cathode chamber with an anode placed inside the cathode and outside while the anode chamber of the electrolyzer is located between two side and additionally installed front cathode chambers.

Description

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

A device for wastewater treatment is known, which is a body divided into sections of preliminary water treatment (made in the form of a two-chamber diaphragm electrolyzer with an anion exchange membrane) and electroflotation treatment, with a set of insoluble horizontal electrodes placed in it, pipes for supplying wastewater and withdrawing purified water and a device for removal of sludge [A.S. USSR No. 1675215 A1, IPC C02F 1/46, C02F 1 / 465.C02F 1/465, declared 10/13/1989; publ. 08/30/1991. Bull. No. 32].

The disadvantage of this device is the lack of performance and stability of the wastewater treatment process.

It is known that the device selected as a prototype contains a housing with a three-chamber electrolyzer with insoluble electrodes and water and electrolyte inlet and electrolyte outlet pipes, the anode chamber of which is located between symmetric cathode chambers, separated from them by cation exchange membranes mounted in parallel to each other, and an electroflotation chamber equipped with a outlet for purified water, a sludge collector, a partition dividing the chamber into two sections, each of which is equipped with a a set of horizontal insoluble electrodes, an overflow partition placed between the anode chamber of the electrolyzer and the electroflotation chamber [RF Patent No. 2067555 C1 IPC ⁶ C02F 1/46, 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 / V. Kolesnikov, S. Varaksin, L. L. Kamynina declared 04/28/1993; publ. 10/10/1996].

The disadvantage of this device design is the low productivity of the processes of membrane electrolysis of wastewater treatment containing water-alkaline photoresist SPF-VSC.

The purpose of the claimed utility model is to eliminate this drawback, namely, increasing the productivity of membrane electrolysis processes of wastewater treatment containing water-alkaline photoresist SPF-VSC.

The technical result consists in increasing the productivity of membrane electrolysis processes and is achieved by the fact that the device is equipped with an additional cathode chamber with an anode placed inside the cathode and outside, while the anode chamber of the electrolyzer is located between two side and additionally mounted front cathode chambers.

Due to the increase in the area of electrodes and membranes, electrode processes and the mass transfer rate are doubled, and, consequently, the productivity of membrane wastewater treatment processes increases with the same dimensions of the device.

A comparative analysis of the inventive device of the utility model and the prototype shows that the inventive device differs from the known one in that it is equipped with an additional cathode chamber formed by a cation exchange membrane and a front wall with an anode located inside the cathode and outside, located inside the anode chamber of the electrolyzer.

Figure 1 presents a top view of the proposed utility model.

The device consists of a housing 1, divided by an overflow partition 2 into an electrolyzer and an electroflotation cleaning chamber. The cell is made four-chamber with a common anode space, separated from the cathode chambers by cation exchange membranes 7. In this case, the anode chamber of the cell is located between two side and additionally mounted front cathode chambers.

In the cathode chambers of the electrolyzer installed plate cathodes 9 nozzles for input 10 and output 11 of alkaline water (catholyte). Perforated anodes and nozzles 4 for introducing wastewater are installed in the anode chamber.

Between the anode chamber of the electrolyzer and the electroflotation chamber, an overflow partition 2 is placed.

The electroflotation cleaning chamber is divided by a partition 12 into two independent sections, each of which contains a set of horizontal comb electrodes 3 and there are nozzles 5 for outputting purified water. From the opposite end of the electroflotation cleaning section from the electrolyser there is a foam collector 13. A foam collector 6 mounted by the drive 14 is mounted on the frame of the housing.

). В катодных камерах мембранного электролизера на катодах 9 протекает электрохимическая катодная реакция разряда молекулы воды с образованием газообразного водорода и ОН⁺-иона (₂H₂O+2

→H₂+2OH^-).The device operates as follows. Wastewater containing the components of the photosensitive layer of the SPF-VSC water-alkaline photoresist enters through the nozzles 4 into the anode chamber of the electrolyzer, in which, under the influence of a constant current load, an electrochemical anode reaction of the discharge of water molecules with the formation of gaseous oxygen and H ⁺ ions (2H ₂ O → O ₂ + 4H ⁺ +4

) In the cathode chambers of the membrane electrolyzer at cathodes 9, the electrochemical cathodic reaction of the discharge of a water molecule proceeds with the formation of gaseous hydrogen and OH ⁺ ion ( ₂ H ₂ O + 2

→ H ₂ + 2OH ^- ).

The presence of membranes ensures the separation of the products of electrode reactions, resulting in acidification of water in the anode layer and alkalization in the cathode layer.

Acidification of wastewater in the anode chambers causes a decrease in pH, which contributes to the formation of the dispersed phase of the SPF-VSC photoresist and its flotation with oxygen bubbles.

Further, the wastewater containing the dispersed phase of the SPF-VSC photoresist is poured through the partition 2 and enters the electroflotation treatment section, where under the action of gases (hydrogen and oxygen) generated during the electrolysis of water, which is provided by the electrodes 3 (cathode and anode), the process of separating wastewater and particles of the dispersed phase of the photoresist. The latter rise to the surface of the water and form a foam layer there (flotation sludge). The cleaned is removed from the device through the nozzles 5.

The sludge is removed from the water surface by a foam collecting device 6 to a foam collecting tank 13 and is discharged from the device through a pipe 15.

The proposed utility model allows to increase the productivity of membrane electrolysis of wastewater treatment in the production of printed circuit boards containing water-alkaline photoresist SPF-VSC, 2 times.

Claims (1)

A device for wastewater treatment for the production of printed circuit boards containing the SPF-VS photoresist, comprising a housing with an electrolyzer in the form of an anode and two side cathode chambers and an electroflotation chamber, characterized in that the device is equipped with an additional cathode chamber with an anode placed inside the cathode and outside while the anode chamber of the electrolyzer is located between two side and additionally installed front cathode chambers.

Images