SU861334A1 - Method of purifying waste water containing paint-varnish impurities - Google Patents

Description

(54) METHOD FOR CLEANING WASTE OX,

one

The invention relates to the cleaning of solids. Wastewater from the machine-building industry, mainly enterprises of instrument-making, which have a site for etching printed circuit boards, and can be used in wastewater treatment of paint shops that include, for example, enamels, soils and organic solvents. | Q

 In modern engineering all enterprises have painting shops. However, until now, there are no simple and reliable methods for the purification of wastewater from the etry ka production facilities. Known methods such as ultrafiltration, incineration, ion exchange require either the use of expensive and scarce materials, or the use of expensive equipment and high energy costs.

A known method of purification of wastewater containing the paint dissolved in water in a non-coagulated form, providing for the alternate addition of acid and alkaline reagents to this wash water. The pH is maintained between 6-9. Reagents are added in quantity.

CONTAINING PAINT AND PAINT POLLUTION

sufficient to substantially complete fl coagulation.

With this method of purification of produced wastewater, a large amount of reagents and rather complicated equipment are required.

There is a method of treating water by settling with simultaneous degassing and subsequent neutralization with lime in two mixed basins. After neutralization, pH 6-8. Coagulants are added to facilitate processing. After treatment, the water is fed further

cleaning t2

However, the existing method does not allow for a high degree of water purification and at the same time requires the use of an expensive coagulant reagent.

The aim of the invention is to increase the degree of purification of industrial wastewater, while simultaneously disposing of spent pickling solutions and wastewater of the electroplating shop of instrument-making enterprises.

The goal is achieved by the fact that the wastewater is treated successively with lime to a pH of 8-10 and. worked off pickling solution

Claims (3)

Claim 1. The method of wastewater treatment,. containing paint and varnish contamination, including treatment with lime and a coagulant, characterized in that, in order to increase the degree of purification while disposing of spent pickling solutions and wastewater from the galvanic shop of instrument-making enterprises, lime treatment is carried out with a pH of 8-10, the spent pickling solution is used as a coagulant , the resulting mixture is subjected to treatment with milk of lime together with the wastewater of the galvanic shop. 2. The method according to p. min after lime treatment, 3. The method according to claims 1 and 2, characterized in that the treatment with milk of lime is carried out .8-12 minutes after mixing the effluent.