SU1411286A1 - Electrocoagulator for purifying waste water - Google Patents

Abstract

The invention relates to devices for the electrochemical treatment of wastewater containing organic and mineral impurities that are in a colloid-dispersed and dissolved state, including synthetic surfactants. The purpose of the invention is to increase the degree of water purification. The electrocoagulator contains a vertical case, in the upper part of which there is a narrowing, in the lower part there is a set of soluble electrodes, and the inlet and outlet connections are clean-. water, located respectively in the lower and upper parts of the body, the electrocoagulant of the driver additionally contains a chamber located in the upper part of the body, and the ratio of the areas of the living section of the chamber and the body is 1: (15-20), and under the set of soluble electrodes. 1 il. 1 tab. o (C (L with:

Description

to

00 Oi

1 u

The invention relates to devices for electrochemical treatment of wastewater containing organic and mineral impurities that are in a colloid-dispersed and dissolved state, including synthetic surfactants.

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

The drawing shows a schematic diagram of an electrocoagulant.

The electrocoagulator consists of a housing 1, in the upper part of which is narrowing 2 with a package of electrodes 3 and a sorption chamber 4 placed in the lower part of the housing. The case of the electric coagulator has branch pipes of the inlet 5 and outlet 6 of the waste water.

Electrocoagulant works as follows.

Sewage water through the input nozzle 5 enters the electrocoagulant and is evenly distributed between the electrodes in the zone of their dissolution. Under the action of direct current, the metal of the electrodes dissolves and the metal hydroxides form, which neutralize the negatively charged contaminants of the sewage,

form flakes easily separable from water. The formation of flakes takes some time. The flocculation process is mainly completed in the flocculation zone, in the upper part, of the hull. Sorption of contamination occurs on the surface of the formed flakes. In order for this process to proceed efficiently, it is necessary to carry out the mixing of waste water. During the dissolution of the electrodes, electrolysis gases (H, 0 / j, etc.) are formed. Increasing the water velocity at the entrance of the flow into the sorption chamber 4, as well as the presence of gas bubbles, leads to mixing of waste water, which contributes to additional sorption of contaminants. on the surface of the flakes A mixture of water, flakes and bubbles of gas is removed from the apparatus through the pipe 6, located in the upper part of the pipe. The sufficiently high rate of pouring water into the nozzle 6 leads to the fact that a stable foam layer does not form in the upper part of the apparatus, but is pleasing. The need for a peelama device is eliminated. The most effective sorption contamination occurs when the ratio of the areas of the living section of the flocculation zone and the sorption zone is 15: 1-20: 1. In this case, the intensity of mixing is sufficient to ensure contact between the flakes and soils and at the same time does not lead to a noticeable destruction of the flakes. An increase in the ratio of the areas of the living cross section of two zones (over 20: 1) leads to more intensive movement, to the destruction of flakes and desorption from them. contamination and, consequently, to reduce the degree of purification. A decrease in the ratio (below 15: 1) does not provide the necessary contact of contaminants with the surface of the flakes, which also leads to a decrease in the degree of purification.

In order to not happen

destruction of the flakes when the flow passes from the flooding zone to the sorption chamber A, the upper body roof is made in the form of a truncated pyramid. This provides a constant increase in the speed of the flow,

Example .. Rated water having a BOD of 200 mg / l, COD 400 mg / l, suspended matter content 220 mg / l of surfactant 70 mg / l, is treated in an electrocoagulator at a current density of 6.9 mA / cm and flow rate 2 m / h

Comparative data on wastewater treatment in an electrocoagulator with a different ratio of the areas of the living section of the flocculation and sorption zones are shown in the table.

The electrocoagulator provides a higher degree of purification from organic pollutants, estimated

on MIC., and

COD weighted

substances and

/

Synthetic surfactants allowing the use of purified water in industrial processes or discharging it into a reservoir.

g formula inventions

Electro-chugulor for wastewater treatment, containing a vertical casing 5 in the upper part of which is located with Aienia, and in the lower part there is a set of soluble electrodes, and branch pipes for supplying and withdrawing, located respectively at the bottom and at the top;) pt l and h HI u and u

so that, in order to increase the ratio of the areas of the living section of the cleaning, the electrocoagulator is equipped with a chamber and the housing is 1: (15-20 with an additional chamber located and the input connection is located under the upper part of the housing, and with the electrolyte of soluble electrodes.

28 20 20 21 35

27 15 18 20 30

eight

5.2 4.8 4.9 11

Claims (1)

Claim Electrocoagulator for purifying waste water, comprising a vertical housing, the top of which there is a restriction, and the bottom part is a set of soluble electrodes, and input and output connections cleanability!) Of water, placed in a corresponding ^one governmental lower and upper housing parts, · of Including the fact that, in order to increase the degree of purification, the electrocoagulator is equipped with additional camera, located in the upper part of the body, and Cross-sectional ratio bpc ₅ , mg / l COD, mg / l 7: 1 28 75 15: 1 20 65 18: 1 20 60 20: 1 21 60 25: 1 35 80 the ratio of the living area of the chamber and the housing is 1: (15-20), and the input pipe is placed under a set of soluble electrodes. Suspended Substances, mg / L SPAS, 'mg / l 27 8 fifteen 5.2 18 4.8 20 4.9 thirty eleven