SU1749179A1 - Electric coagulator for water purification - Google Patents

Abstract

The invention relates to devices for the electrochemical treatment of wastewater and allows an increase in the degree of purification. The electrocoagulator contains a housing separated by a diaphragm on the anode and cathode space, as well as water supply and discharge piping, the diaphragm is set at an angle to the vertical axis, the anode and cathode are made of a package of soluble chips and an insoluble plate, and the water supply nozzle is installed in the point of contact between the diaphragm and the anode The insoluble cathode plate can be installed symmetrically to the diaphragm. Such an implementation of electrocoagula torz allows to increase the degree of water purification due to more efficient maintaining electrocoagulant in the treated water in the zone of entry of the latter to treatment. 1 hp f-ly, 2 ill., 1 table

Description

The invention relates to chemical technology, in particular, to a technique for the treatment of waste circulating water in closed systems of water economy, as well as natural waters contaminated with heavy metal ions (including hexavalent chromium) and / or fluorine compounds and / or suspended easily dispersed substances.

The purpose of the invention is to increase the degree of purification.

1 shows an electrocoagulant for water purification; Fig. 2 shows the same for water purification from specific impurities, preventing slimeing of a semi-flowing cathode chamber filled with aluminum chips.

The electrocoagulator consists of a dielectric body 1, inlet nozzles 2 and

output 3 of treated water, flow cathode 4 and non-flowing anode 5 chambers, insoluble 6 and chip soluble 7 anodes, insoluble perforated 8 and aluminum chip 9 cathodes, as well as a semi-permeable diaphragm 10 and a semi-flowing cathode chamber 11,

Electrocoagulant works as follows.

Purified water through the inlet nozzle 2 enters the narrow part of the flow cathode chamber 4, from where it fills the non-flowable anode chamber 5 through the pores of dyrphama 10. The treated water is removed by the nozzle 3 located in the wide part of the flow cathode chamber 4. As a result, the flow cathode chamber expanding along the water course providing j

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The intensity of mixing is reduced, the bulk of the coagulating ions generated during the cathodic and anodic reactions are introduced into the zone of intensive mixing of water due to the presence of high speeds and, accordingly, low hydrodynamic pressure, which causes water to flow from the non-flowing anode chamber 5 and a semi-high cathode chamber 11, which is separated by a perforated insoluble cathode and filled with aluminum chips. Since the anolyte from the anode chamber is removed in an insignificant amount in the zone of the aperture of the diaphragm to the cathode, an acidic medium is established in the anode chamber, as a result of which the chip anode intensively dissolves to form chips of material of the chip. As the concentration of these ions increases in the anolyte, the latter migrate through the diaphragm 10 to the flow cathode chamber 4, where they hydrolyze and coagulate into large flakes. A slight suction of the anolyte in the area adjacent to the diaphragm to the cathode provides an increase in the diffusion transfer of ions from the non-flowing anodic 5 to the flow-through cathode 4 chambers. In the semi-flowing cathode chamber, the aluminum chip cathode undergoes chemical dissolution due to an increase in the active catholyte reaction. It is relegated to the zone of intersection of the diaphragm to the cathode due to the hydrostatic pressure drop in front of and behind the perforated insoluble cathode.

Example. Water containing suspended substances, fluorine compounds and heavy metal ions (ITM) is cleaned in an electrocoagulator comprising a cathode and anode chambers separated by a diaphragm and filled with metal chips. The insoluble cathode and anode are mounted at an angle, with the latter in contact with the water inlet side.

To compare the purification efficiency, water is also treated in a known strand electrocoagulator, diaphragm and

insoluble cathode which is installed in parallel.

Diaphragm current density when water is treated in both electrophore / l batteries

support in the range of 50-60 A / m2.

After treatment in the known and proposed electrocoagulators, water is directed to the separation of coagulated impurities into a flotation tank, where after 4045 min of separation, samples are taken.

The table shows the results of research.

As follows from a comparison of the data in the table, the proposed electrocoagulator provides an increase in the degree of water purification compared with the known average of 16-20%.

An increase in the cleaning effect is achieved by placing the diaphragm at an angle

to the cathode (symmetrically to the cathode), so that the diaphragm and the cathode are in contact with the water inlet side.

In this case, an effective introduction of the main mass of the electrochemically produced coagulant into the treated water in the zone of entry of the latter to the treatment, i.e. in the zone of intensive mixing, the formation of large fast precipitated hydroxide flakes

metals with impurities extracted from water at the exit to the separator due to ensuring a gradual decrease in the intensity of water mixing during processing in the interelectrode space, an additional input of chemical dissolution products of the combined cathode.

Claims (2)

1. Electrocoagulant, for water purification, comprising a housing divided by a diaphragm into anode and cathode spaces, an insoluble cathode and an anode made of a package of soluble chips and an insoluble plate, and also the supply pipes and The water outlet, from the vessel and the water body, is that, in order to increase the degree of cleaning, the diaphragm is set at an angle to the vertical axis, the cathode is made of aluminum chips and an insoluble perforated plate, and the diaphragm and the cathode plate are in contact with the water inlet pipe. 2. The electro-coagulant according to claim 1, of which is insoluble perforated plate of the cathode is installed symmetrically to the diaphragm. 1 2