Aerobic and anaerobic biodegradation of nitrilotriacetate in subsurface soils |
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| Authors: | T E Ward |
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| Affiliation: | 1. Centro de Química e Bioquímica, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal;2. IBMC-Instituto de Biologia Molecular e Celular, Universidade do Porto, Rua do Campo Alegre 823, 4150-180 Porto, Portugal;3. Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Rua Alfredo Allen 208, 4200-135 Porto, Portugal;4. ICBAS-Instituto de Ciências Biomédicas de Abel Salazar, Universidade do Porto, Rua de Jorge Viterbo Ferreira 228, 4050-313 Porto, Portugal;1. Department of Medicine, Section of Pulmonary Critical Care, The University of Chicago, Chicago, IL, USA;2. Department of Neurology, The University of Chicago, Chicago, IL, USA;3. Department of Biochemistry and Molecular Biology, The University of Chicago, Chicago, IL, USA;4. Department of Pediatrics, The University of Chicago, Chicago, IL, USA;1. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, Koptug ave. 3, Novosibirsk 630090, Russia;2. Novosibirsk State University, Pirogova Str. 2, Novosibirsk 630090, Russia;3. Novosibirsk State Technical University, K. Marksa ave. 20, Novosibirsk 630073, Russia |
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| Abstract: | ![]()
Studies were conducted to characterize mineralization of nitrilotriacetate (NTA) in subsurface soils under aerobic and anaerobic conditions. Chemical (redox indicator, resazurin) and biological (dentrification) markers were used as indicators of anaerobic conditions in the test system. The indigenous microflora in subsurface soils previously exposed to septage containing NTA were able to rapidly mineralize NTA under aerobic and anaerobic conditions. The half-lives (t1/2) of mineralization for NTA in aerobic soils ranged from 87 to 160 hr. Biodegradation of NTA under anaerobic conditions where NO3- indicates that a mechanism exists for the anaerobic biodegradation of this substrate. NTA biodegradation can occur readily in the absence of molecular oxygen and the NTA-monooxygenase which are required for the aerobic mineralization of this substrate. These results provide the first evidence that the indigenous microflora in subsurface soils of septic tank tile fields can rapidly degrade NTA under anaerobic conditions. |
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