Open AccessAdvanced biodegradation process of atrazine in the peroxidase-mediated sequencing batch reactor (SBR) and moving-bed SBR (MSBR): mineralization and detoxification
Author(s) -
Hossain Momeni Nejad,
Gholamreza Moussavi
Publication year - 2020
Publication title -
journal of environmental health science and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
ISSN - 2052-336X
DOI - 10.1007/s40201-020-00471-2
Subject(s) - biodegradation , atrazine , mineralization (soil science) , sequencing batch reactor , chemistry , bioreactor , hydrogen peroxide , peroxidase , lignin peroxidase , environmental chemistry , biochemistry , wastewater , enzyme , organic chemistry , environmental engineering , pesticide , biology , environmental science , agronomy , nitrogen
The advanced biodegradation process of atrazine was stimulated with hydrogen peroxide (H 2 O 2 ) in a sequencing batch reactor (SBR) under different operational conditions due to in situ generation of H 2 O 2 -peroxidase. The complete biodegradation and mineralization of 50 mg/L atrazine was achieved in the SBR with a biomass concentration of 328 mg/L stimulated with 10 mM of H 2 O 2 . The presence of H 2 O 2 in the SBR induced the generation of H 2 O 2 -peroxidase resulted in acceleration of atrazine biodegradation. Adding moving media to the SBR system and converting it to the MSBR considerably improved the rate of atrazine biodegradation and mineralization under H 2 O 2 mediation. The highest specific utilization rate of atrazine in the SBR operated at the biomass concentration of 55 mg/L was 19.4 mg/g biomass .h, while it was 33.5 mg/g biomass .h in the MSBR operated at the biomass concentration of 37 mg/L. The low ATZ removal along with no peroxidase activity in the bioreactor in absence of H 2 O 2 clearly ideated that the biodegradation and mineralization of ATZ was considerably mediated by H 2 O 2 -peroxidase enzyme. The toxicity of atrazine solution decreased markedly when treated in the MSBR under optimum conditions. Accordingly, the MSBR stimulated with H 2 O 2 is an efficient and thus promising process for biodegradation of recalcitrant compounds.