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Removal of endosulfan in a sequencing batch reactor: addition of granular activated carbon as improvement strategy
Author(s) -
Reynoso Varela Andrea,
Vázquez Contreras Fabián P.,
de los Santos Villalobos Sergio,
Alvarez Valencia Luis H.,
Ulloa Mercado Ruth G.,
Serrano Palacios Denisse
Publication year - 2021
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/wej.12637
Subject(s) - endosulfan , sequencing batch reactor , effluent , chemistry , activated carbon , batch reactor , pesticide , metabolite , bioreactor , environmental chemistry , chromatography , pulp and paper industry , nuclear chemistry , environmental engineering , organic chemistry , environmental science , biology , biochemistry , adsorption , agronomy , catalysis , engineering
A granular activated carbon‐sequencing batch reactor (GAC‐SBR) was used to assess the removal of organochlorine endosulfan pesticide. The reactor operated in three stages: (I) starter and stabilization; (II) addition of 4 mg/L of endosulfan in feed; and (III) a single addition of 1 g/L of GAC to mixed liquor. During the 249 days of operation, the removal efficiency of COD was 96 ± 2%; for NH 4 + ‐N 72 ± 1%; and for PO 4 −3 ‐P 48 ± 13%. Was eliminated the 79% of endosulfan in stage II and 99% in stage III, not found its metabolite (endosulfan sulphate) in the reactor effluent. A consortium of eight bacterial strains was identified in the reactor stages, assessing five of them in the presence of 4 mg endosulfan/L by growth kinetics. According to the results, the joint action of the consortium and GAC addition is the responsible of eliminating the pesticide.