Combination of the Electro/Fe^sup 3+^/peroxydisulfate (PDS) process with activated sludge culture for the degradation of sulfamethazine

In this paper, the major factors affecting the degradation and the mineralization of sulfamethazine by Electro/Fe3+/peroxydisulfate (PDS) process (e.g. current density, PDS concentration, Fe3+ ions concentration and initial sulfamethazine (SMT) concentration) were evaluated. The relevance of this pr...

Full description

Saved in:
Bibliographic Details
Published inEnvironmental toxicology and pharmacology Vol. 53; p. 34
Main Authors Ledjeri, Amina, Yahiaoui, Idris, Kadji, Hakima, Aissani-Benissad, Farida, Amrane, Abdeltif, Fourcade, Florence
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier Science Ltd 01.07.2017
Subjects
Activated sludge
Biodegradability
Biodegradation
Biological treatment
Culture
Current density
Degradation
Electrolysis
Iron
Mineralization
Organic chemicals
Pretreatment
Rods
Sludge
Sulfamethazine
Online AccessGet full text

Cover

More Information
Summary:In this paper, the major factors affecting the degradation and the mineralization of sulfamethazine by Electro/Fe3+/peroxydisulfate (PDS) process (e.g. current density, PDS concentration, Fe3+ ions concentration and initial sulfamethazine (SMT) concentration) were evaluated. The relevance of this process as a pretreatment prior to activated sludge culture was also examined. Regarding the impact on SMT degradation and mineralization, the obtained results showed that they were significantly enhanced by increasing the current density and the PDS concentrations in the ranges 1-40 mA cm2 and from 1 to 10mM respectively; while they were negatively impacted by an increase of the initial SMT concentration and the Fe3+ concentration, from 0.18 to 0.36mM and from 1 to 4mM respectively. The optimal operating conditions were therefore 40 mA cm-2 current density, 10mM PDS concentrations, 1 mM Fe3+ and 0.18mM SMT. Indeed, under these conditions the degradation of SMT and its mineralization yield were 100% and 83% within 20 mm and 180 mm respectively. To ensure a significant residual organic content for activated sludge culture after Electro/Fe3+ /PDS pre-treatment, the biodegradability test and the biological treatment were performed on a solution electrolyzed at 40 mA cm2, 10 mM PDS concentrations, 1 mM Fe3+, and 0.36 mM SMT. Under these conditions the RODS/COD ratio increased from 0.07 to 0.41 within 6 h of electrolysis time. The subsequent biological treatment increased the mineralization yield to 86% after 30 days, confirming the relevance of the proposed combined process.
ISSN:1382-6689
1872-7077