Abstract

The object of research is the washing waste water of galvanic plants containing heavy metal cations. The most common reagent methods for purification of galvanic drains do not provide the required degree of water purification, are accompanied by the loss of valuable components and the formation of significant amounts of toxic sludge. Ion exchange is promising in development of wastewater treatment of galvanic productions. One of the most important problems of ion-exchange technology is the processes of regeneration of ion exchangers, and, in particular, the recycling of spent regeneration solutions. The most promising in the recovery of regeneration solutions is the electrochemical method. However, electroextraction of zinc and nickel is practically impossible from acidic solutions without separation of the electrode space by the membrane. In addition, effluents from the galvanic industry contain mixtures of heavy metal ions. This complicates the process of wastewater treatment and the return of valuable components to production. In the course of the study, a strongly acidic cation exchanger KU-2-8 in the Na + -form is used to study the processes of combined sorption of heavy metal ions. Regeneration of the cation exchanger is carried out with solutions of sulfuric and hydrochloric acids. Electroextraction of zinc and nickel from acid regeneration solutions is carried out in a two-cell electrolyzer with an anion-exchange membrane MA 41. The obtained results indicate that under conditions of the concentration of heavy metals on cation exchanger KU-2-8, efficient separation can’t be achieved. It is established that ions of heavy metals are sorbed individually and in mixtures with other ions of heavy metals are effectively desorbed by solutions of sulfuric and hydrochloric acids. The use of a two-cell electrolyzer, in contrast to carrying out electrolysis processes without separation of the electrode space, almost completely eliminates zinc and nickel ions from acidic regenerative rods. And to obtain a solution of sulfuric acid in the anode chamber at a concentration of 239–651 meq/dm 3 .

Highlights

  • The issue of pollution of natural water bodies refers to global environmental problems

  • A necessary and important issue is the development of technologies for local wastewater treatment from heavy metal ions in the treatment plants of enterprises to prevent the accumulation of hazardous toxicants in surface water bodies

  • To achieve the aim it is necessary to solve the following tasks: 1. To determine the mutual influence of heavy metal ions on sorption on strong acidity cation exchanger KU-2-8 when extracted from aqueous solutions – analogues of washing waters of galvanic industries

Read more

Summary

Introduction

The issue of pollution of natural water bodies refers to global environmental problems. Technology audit and production reserves — No 2/3(40), 2018, © Gomelya N., Trohymenko G., Shabliy T., Hlushko O They do not collapse under natural conditions, but only change the form of finding, gradually accumulating in various components of the ecosystem. It should be noted that the typical urban water treatment plants do not provide for the stage of extraction of heavy metal ions from sewage. In this regard, a necessary and important issue is the development of technologies for local wastewater treatment from heavy metal ions in the treatment plants of enterprises to prevent the accumulation of hazardous toxicants in surface water bodies. It is relevant to study in the field of non-waste technologies for sewage treatment of galvanic plants

The object of research and its technological audit
The aim and objectives of research
Research of existing solutions of the problem
Methods of research
SWOT analysis of research results
Findings
Conclusions
Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call