Open AccessImprovement of the technological treatment scheme of iron-containing wastewater from etching operations
Author(s) -
Mykola Yatskov,
Natalia Korchyk,
Oksana Mysina,
Nadia Budenkova
Publication year - 2021
Publication title -
eureka, life sciences/eureka, life sciences.
Language(s) - English
Resource type - Journals
eISSN - 2504-5695
pISSN - 2504-5687
DOI - 10.21303/2504-5695.2021.001883
Subject(s) - wastewater , reagent , etching (microfabrication) , process engineering , purified water , reverse osmosis , waste management , materials science , chemistry , environmental engineering , environmental science , engineering , layer (electronics) , nanotechnology , membrane , biochemistry , organic chemistry
The aim of the research is to improve the technological scheme of treatment of iron-containing wastewater from etching operations by creating combined systems, including reagent wastewater treatment, their mutual neutralization, regeneration of etching solutions, deep post-treatment using a magnetic device. The main volume of wastewater is treated in centralized systems with partial return of water to the production process. Spent solutions from etching operations are subject to regeneration with return to the production process and partial dosing into the main wastewater stream from flushing operations. The consumption of commercial HCl is reduced by 50%. The use of hydrogen peroxide can increase the effect of extracting iron from etching solutions by 30% (total purification effect of 70%). Given that deep purification from iron-containing impurities is provided using a magnetic device, the possibilities of practical implementation of reverse osmosis to obtain "pure" water in centralized systems, which can be used for preparation of process solutions and in a mixture with technical water - for flushing operations, increase. In experimental and industrial conditions the expenses of reagents, their concentrations, dosing time are established