Biodegradation of 2, 4-dicholophenoxyacetic acid using an acidogenic anaerobic sequencing batch reactor. Issue 1 (1st January 2005)

• Record Type: Journal Article
• Authors: Chin, H; Elefsiniotis, P; Singhal, N
• Is Part Of: Journal of environmental engineering and science. Volume 4:Issue 1(2005)
• Page Start: 57
• Page End: 63
• Publication Date: 2005-01-01
• Subjects: environment; Environmental engineering -- Periodicals; Sanitary engineering -- Periodicals; Environmental engineering -- Canada -- Periodicals; Environnement, Technique de l' -- Périodiques; Technique sanitaire -- Périodiques; Environnement, Technique de l' -- Canada -- Périodiques; Environmental engineering; Sanitary engineering; Canada; Electronic journals; Computer network resources; Periodicals; 628.05
• DOI: 10.1139/s04-044
• Languages: English
• ISSNs: 1496-2551

Abstract

Abstract : A bench-scale study was carried out to investigate the potential to biologically treat 2, 4-dicholophenoxyacetic acid (2, 4-D) contaminated wastewater in an anaerobic sequencing batch reactor (ASBR), operated in the acid-phase digestion mode. The effects of 2, 4-D feed concentration (20 to 200 mg L –1 ) and temperature (ambient and 33 °C) on biodegradation were investigated at a hydraulic retention time of 48 h and a solids retention time of 10 d, using glucose as a supplemental substrate. Following a long acclimation period of about 100 d, complete 2, 4-D degradation was observed at feed concentrations of 20 and 100 mg L –1 . However, at a 2, 4-D concentration of 200 mg L –1, only 65% removal was achieved. Overall, operation at an ambient temperature resulted in a slightly better performance than that at 33 °C. An adaptation period of approximately a week was required any time the 2, 4-D concentration was increased, indicating a sensitive behavior towards shock loadings. On the other hand, glucose was completely and readily degraded throughout the study. A sequential utilization pattern of glucose and 2, 4-D was also observed, with degradation of both substrates following first-order kinetics. Moreover, volatile fatty acids (VFAs) were the main products of acidogenesis, accounting for 65% of the effluent soluble chemical oxygen demand (COD), with acetic acid being by far the most predominant VFA detected. Key words : anaerobic sequencing batch reactor, acidogenesis, kinetics, 2, 4-D, glucose, volatile fatty acids.