Polymeric composition for purification of wastewater from various impurities in textile industry

Abstract

This article deals with the development of new and improvement of traditional methods of wastewater treatment of dyening and finishing industries. The composition was developed on the basis of local natural minerals (bentonite Navahermosa origin, sodium bisulfite, polyacrylamide and aluminium sulphate) for the treatment of wastewater of the textile industry. The influence of bentonite particle size on the degree of wastewater discoloration at different flow rates was studied. With a range of wastewater supply flow rates from 0.5 to 2.0 m/s with a particle size of bentonite adsorbent in the range of 0.25-1.0 nm, the maximum degree of wastewater bleaching is achieved and it is in the range of 84-87%. For microporous adsorbents (CAD-100 and CAD-200) the effec-tiveness of the discoloration also does not depend on the particle size and ranges from 85 to 87 %. It was found that, for fine-pored adsorbents (BKA-100 and BKA-200), the efficiency of discolora-tion also practically does not depend on the particle size and ranges from 85 to 87 %. The highest degree of wastewater treatment according to the proposed composition, apparently due to the fact that in the adsorption process, in addition to the sorption of sewage impurities on the surface of adsorbents, there is a sorption of ions and molecules of dissolved substances on the surfaces of air bubbles and their removal in the foam layer. The wastewater treatment parameters of the dyeing and finishing shop using the bentonite composite adsorbent show that the degree of removal of contaminants by the method developed by us is much higher compared to the sedimentation of aluminum or iron oxyhydrates with adsorbed contaminants. Moreover, the effects of reducing the value of COD and concentration of the surfactant in the wastewater was, on average, 65 % and 82 %, and compared to the effects of reducing the same parameters at defending precipitation of oxy-hydrates at 48-54 % and 54-61 %, respectively.