Biodegradation of atrazine from wastewater using moving bed biofilm reactor under nitrate-reducing conditions: A kinetic study. (15th April 2018)

• Record Type: Journal Article
• Authors: Derakhshan, Zahra; Ehrampoush, Mohammad Hassan; Mahvi, Amir Hossein; Ghaneian, Mohammad Taghi; Mazloomi, Seyed Mohammad; Faramarzian, Mohammad; Dehghani, Mansooreh; Fallahzadeh, Hossein; Yousefinejad, Saeed; Berizi, Enayat; Bahrami, Shima
• Is Part Of: Journal of environmental management. Volume 212(2018)
• Page Start: 506
• Page End: 513
• Publication Date: 2018-04-15
• Subjects: Anoxic condition -- Anoxic moving bed biofilm reactor -- Atrazine -- Biodegradation -- Herbicides; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2018.02.043
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: In this study employed an anoxic moving bed biofilm reactor (AnMBBR) to evaluate the effects of hydraulic and toxic shocks on performance reactor. The results indicated a relatively good resistance of system against exercised shocks and its ability to return to steady-state conditions. In optimal conditions when there was the maximum rate of atrazine and soluble chemical oxygen demand (COD) removal were 74.82% and 99.29% respectively. Also, atrazine biodegradation rapidly declines in AnMBBR from 74% ± 0.05 in the presence of nitrate to 9.12% only 3 days after the nitrate was eliding from the influent. Coefficients kinetics was studied and the maximum atrazine removal rate was determined by modified Stover & Kincannon model (Umax = 9.87 gATZ /m 3 d). Results showed that AnMBBR is feasible, easy, affordable, so suitable process for efficiently biodegrading toxic chlorinated organic compounds such as atrazine. Also, its removal mechanism in this system is co-metabolism. Graphical abstract: Image 1 Highlights: Anoxic moving bed biofilm reactor was tested for atrazine and COD removal. Atrazine and COD removal efficiencies of 74% and 99%, respectively were achieved. Biodegradation of atrazine occurs due to co-metabolic process. Atrazine degradation occurred mainly through the denitrifying anoxic mechanism. Stover-Kincannon model was the best model for describing target pollutant removal.