SU701956A1 - Method of purifying spent aqueous emulsions - Google Patents

Description

The invention relates to methods for cleaning off spent aqueous emulsions and may find application in wastewater treatment containing these emulsions together with spent pickling wastewater. There is a known method for the destruction and purification of aqueous emulsions with sodium, calcium, and magnesium salts 1. However, the rate of destruction and cleaning is relatively low, and the cost of cleaning is high. As the closest technical solution, a method of treating waste water containing oil emulsions used in treating metals with a mixture of alkaline-ferrous calcium formate metal and hydrophobic silicic acid at the boiling point of solutions 2 is taken. The disadvantage of this method is a low degree of purification ( 85-90%) the need to heat wastewater to the boiling point, high costs of reagents (calcium formate and silicic acid), the formation of a large amount of oily sediments and large reagent regeneration agents. In order to increase the degree of purification and efficiency of the process, it is proposed to mix waste aqueous emulsions with pickling solutions containing copper and zinc sulfate salts in a ratio of 1: 0.1 - 0.5: 1; process the aqueous phase with alkali to a pH of 8-9 and defend. The composition of wastewater varies widely, and the mutual purification of waste water emulsions and pickling solutions most intensively occurs only in experimentally established ratios - from 1: 0.1 to 0.5: 1. When these ratios change, the process of mutual wastewater treatment and sedimentation is drastically deteriorated. The primary cleaning of pickling solutions and emulsions is due to the formation of insoluble complex compounds of copper and zinc with organic compounds (triethanolamine and oleic acid) of spent aqueous emulsions. The subsequent purification of waste water emulsions takes place due to the sorption of transformer oil on the 5th former forming 1-1xc hydroxides of met.alloids, while alkalizing the treated wastewater to pH. The method was tested in laboratory conditions with mutual purification of resistant waste water emulsions produced at production plants processing non-ferrous metals ;, prepared on the basis of the lubricant ATP-3 containing 9, 5 10J5% oleic acid, 5.5-6.5% Trietag-Kugamin 83-851 oils of transformer, ,, pickling solutions of rolling production plants processing non-ferrous metals containing

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oil emulsion to petroleum products

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100 98

A solid precipitate is formed, which is almost not settled.

 the invention

GnocoC purification of waste-water emulsion, including treatment with the role of me-1h; there was also a separation of the precipitate from the phase; different xeMf WHAT; with; tal0 increase the degree of purification and efficiency of the process from the worked water / elsia mixed with etching q;: Influenced with solutions containing copper and zinc salts of cepKOKHCioie

pickling solution

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100 99.99 100 49.8

59.94

the ratio Is 0,1 - O, 5 si, separated from the precipitate, the aqueous phase is treated with alkali to pH 8-9 and defend. Sources -. information taken into account in the examination

1:;, MAINCE h. S, Okhistka of wastewater: water that causes the cooling and cooling of the water flow, Bulletin of the Lvov Polytechnic Institute, 1965, No. 9,2, German Patent No. 1594406, cl. 85 1/00, 1973 50 g / l copper, 70 g / l zinc and 20 g / l of sulfuric acid. An example. 250 ml of an emulsion containing 3% ATP-3 lubricant are placed in a glass beaker, various quantities of the pickling solution of the above composition are added, intensively transferred for a few seconds, alkalized with alkali to pH e-9f and settled for 1-2 hours and the aqueous phase is filtered, the results of purification of waste water 3114 pulses and pickle solution, prices in the table.