SU962212A1 - Method for purifying effluents from organic contaminants - Google Patents

Description

(54) METHOD FOR CLEANING WASTE WATER FROM ORGANIC IMPURITIES

The invention relates to sewage treatment cnoco 6ciM containing organic impurities, and can be used, for example, in sewage treatment of organic synthesis preparations.

A known method of purifying wastewater from organic impurities by treating them in a layer of granular conductive material placed in the interelectrolytic space of an electric current field, and granules of aluminum, silicon carbide, which is in a fluidized state when fed into, can be used as an electrically conductive material. interelectrode space of oxygen-containing gaea 1.

The disadvantage of this method is a significant energy consumption of (5-10 kWh / m, and in addition, the low degree of purification.

The purpose of the invention is to increase the degree of purification of wastewater containing organic impurities and reduce energy consumption for the process.

The goal is achieved by the fact that during the treatment of wastewater in the layer of granular conductive

a material placed in the interelectrode space of an electric current field with an oxygen-containing gas supply, a mixture of titanium and silicon carbide particles is used as a granular conductive material in the following ratio of components, wt.%;

Titan12-15

ten

Silicon carbide 85-88 A current-carrying material with a particle size of 4-5 mm is used.

The use of aluminum granules or granules with shyumini mixed with carbide

15, the silicon does not ensure the duration of the plant operation due to the fact that aluminum granules in the process of operation are oxidized and a non-conductor is formed on their surface.

20 strong oxide film that prevents the formation of electric discharges. . Additional periodic chemical treatment is required to remove the latter (every 1025–12 hours). Aluminum refers to amphoteric trash and in aggressive (acidic and alkaline waters) is susceptible to destruction. In this regard, in the proposed method, it is recommended to use

30 J Titanium granules, which are not subject to oxidation and corrosion-resistant to aggressive media. Titanium is recommended to be used in a mixture with silicon carbide. The ratio of the mixture consisting of 12-15% titanium and 88-85% silicon carbide was found experimentally. This ratio reduces the electrical resistance of the entire load in the circuit by 1.5-2 times. Arbitrary variation of the metal ratio in the load does not give the desired cleaning effect. With an increase in the metal content of 15 percent or more, a short circuit can be formed, to avoid which it is necessary to add a full resistance to the electrical circuit, which leads to a large consumption of electrical energy. An increase in grain size above 5 mm is not. allows you to create a boiling state (fluidized) conductive load. Consequently, sparking is absent, loading works as a conductor

A mixture of silicon carbide (titanium + titanium) 15% Ti granule size 4-5 mm

Mixture (SiC + Ti)

15 6-f

A mixture of (SiC + Ti) 15% Ti 1-3 mm

Table 1

1024 92.4

3-5

20

3-5

1024

1.024

20

3-5

876

1024

20 no oxidation of contamination occurs, the cleaning effect is zero. A decrease in the grain size of less than 4 mm leads to the removal of the load from the reaction zone of the cleaning apparatus. In this connection, there is a decrease in the amount of conductive load and, consequently, a decrease in the total number of sparks in the reaction zone, which negatively affects the cleaning effect. Comparative data are given in Table. 1. The results of the experiments are presented in table. 2. As follows from the presented data, the application of the proposed method makes it possible to reduce energy consumption by 1.5–2 times and to increase the degree of purification of wastewater from dissolved organic impurities, which makes it possible to use them in circulating water supply and to prevent pollution of the environment.

Claims (2)

1. A method for purifying wastewater from organic impurities by treating them in a layer of granular conductive material placed in the interelectrode space of an electric current field with oxygen-containing gas fed into the interelectrode space, characterized in that, in order to increase the degree of purification and reduce power consumption, as a granular conductive material is used a mixture of particles of titanium and silicon carbide in the following ratios of components, wt.%: Titan12-15 Silicon Carbide 85-88 2. A method according to claim 1, characterized in that a conductive material with a particle size of 4-5 mm is used. Sources of information taken into account in the examination 1. USSR author's certificate No. 467038, cl. C 02 F i / 46, 1972 (prototype),