Open AccessNew technology of increasing the operation of local sewage treatment facilities, providing electric activation treatment of alkaline process solutions
Author(s) -
Sergey Yu. Andreev,
С. В. Степанов,
Alexander A. Knyazev
Publication year - 2021
Publication title -
vestnik sgasu. gradostroitelʹstvo i arhitektura
Language(s) - English
Resource type - Journals
ISSN - 2304-0491
DOI - 10.17673/vestnik.2021.04.1
Subject(s) - electrolysis , sodium hydroxide , alkaline water electrolysis , aqueous solution , hydroxide , electroplating , chemistry , anode , filtration (mathematics) , chromium , galvanic cell , materials science , inorganic chemistry , metallurgy , electrolyte , electrode , mathematics , statistics , organic chemistry , layer (electronics)
The results of laboratory testing of the process of intensification of unconventional cleaning of electroplating drains of an instrument-making enterprise, which provides for electroactivation treatment of technological solutions of sodium hydroxide in a membrane electrolyzer with steel anodes, are presented. It was found that the electroactivation treatment of a 40 % aqueous sodium hydroxide solution in a membrane electrolyzer for T = 1.5 h at an anodic current density i = 400 А/м2 makes it possible to achieve the concentration of sodium ferrate in the activated alkaline solution Сf = 12 g / L, while the value of the current efficiency of sodium ferrate is Кv = 0.47. The use of an alkaline solution that has undergone electro-activation treatment in the technological process of neutralization treatment at local treatment facilities of an instrument-making enterprise equipped with filtration additional treatment units will significantly increase the barrier function, improve the quality of treated galvanic wastewater and bring the concentration of metal ions contained in them to a level, mg / l: iron 0.03; copper 0.01 mg / l; chromium 0.02; zinc 0.01; nickel 0.02.