SU1089057A1 - Method for purifying effluents - Google Patents

Abstract

METHOD OF SEWAGE WATER PURIFICATION, including electrical treatment in the presence of an inorganic salt, characterized in that, in order to increase the degree of purification from oil products and reduce its rigidity, nitrite is used as an inorganic salt, 0.5-1 g / l.

Description

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with

SP sl The invention relates to technical. electrochemical, in particular, to the method of electrochemical treatment of wastewater, and can be used for purification of petroleum products. The known method of sewage treatment, including their treatment with direct electric current C 13. The disadvantage of this method is the low degree of purification from oil products. The closest to the proposed technical feasibility and the achieved effect is the method of sewage treatment, including their electroprocessing in the presence of an inorganic salt, which is used as sodium chloride G2}. The disadvantages of this method are the low degree of purification from petroleum products, the impossibility of removing hardness salts, and an increase in the total salinity of wastewater. The purpose of the invention is to increase the degree of purification from petroleum products and reduce hardness. This goal is achieved by the fact that according to the wastewater treatment method, including their electrical treatment in the presence of an inorganic salt, ammonium nitrite is used as the inorganic salt in the amount of 0.5 to J g / l. As a result of exchange reactions in an electrochemical bath, carbonate, bicarbonate, chloride and other salts are converted to nitrites, which, under the action of an electric current, form a colloidal system with hardness salts, introduced them into the sediment. The mechanism to accelerate the removal of petroleum products consists in the specific adsorption of nitrite ions at the oil-water interface, which reduces the surface tension and thus facilitates the destruction of the water-oil colloid system. PREMIUM : To 250 ml of waste water containing 51 mg / petroleum products and having a hardness of 5.82 mg eq / l, 0.125 g of ammonium nitrite is added and water is poured into a 300 ml electrolyzer, which is an electrode cell made of a dielectric material with a steel system electrodes installed vertically, equipped with fittings for the supply and output of waste water. The electrolyzer is connected to a current source and an electric current with a density of 0.04 A / cm is passed for 10 minutes. Then the water is filtered out and the filtrate is analyzed. Sewage water is purified by the proposed method and the method of the prototype. The cleaning results are presented in the table.

Predpagae1UO11y method Total rigidity, mEq 0.5 0.04 5.82 l Oil products, mg / l

0.04

Oil products, mg / l

96.6

0.23

No-, 100

55 is 0.23

0.4

0.04 The use of the proposed method as compared with the prototype allows an increase in the degree of purification from petroleum products by 3.1–3.6% and a decrease in stiffness by 12.3–12.3%. When the amount of ammonium nitrite is lower than 0.5 g / l, the degree of purification deteriorates and becomes lower than in the prototype.

Table continuation

78.2

5.82

1.27 The upper limit of I g / l is limited by the principle of reagent-free ballast. by increasing the concentration of ammonium nitrite after reacting through the reaction of N2 + 2 H, jO, not all ammonium nitrite will decompose.

Claims (1)

WASTE WATER TREATMENT METHOD, including their electrical treatment in the presence of an inorganic salt, characterized in that, in order to increase the degree of purification from oil products and reduce hardness, ammonium nitrite in amount is used as the inorganic salt. 0.5-1 g / l.