Open AccessComposite method of sewage treatment for chromium ion (VI)
Author(s) -
Л В Мосталыгина,
D.N. Kamaev,
С Н Елизарова
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/862/6/062006
Subject(s) - chromium , bentonite , sorption , hexavalent chromium , ferric , chemistry , chloride , ion , flocculation , nuclear chemistry , metal , chromite , galvanic cell , composite number , metal ions in aqueous solution , inorganic chemistry , materials science , metallurgy , geology , composite material , adsorption , paleontology , organic chemistry
The sewage, containing hexavalent chromium, appears at the different productions, where the main component of technological process is chromic acid. The influence curve has been constructed showing the dependence of the value of the sorption of chromium ions (III) on native bentonite clay. Maximum degree of the treatment is 96.25 % (original concentration is 0.024 mg/ml, minimum degree is 37.63 % (original concentration is 0.481 mg/ml). All the values of residual concentration exceed maximum permissible concentration according to chromium ions. A composite method of sewage treatment of galvanic production for chromium ion (VI) by means of pre-transforming it to chromium ion (III) and adding of bentonite clay and ferric chloride (III) in model solutions has been studied. Ferrum ions after the treatment are not detected in the solution. Optimal mass ratio of metal coagulant to clay in both cases is 1:4000.