A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Competition for electrons between reductive dechlorination and denitrification
Abstract It is common that 2,4,6-trichlorophenol (TCP) coexists with nitrate or nitrite in industrial wastewaters. In this work, simultaneous reductive dechlorination of TCP and denitrification of nitrate or nitrite competed for electron donor, which led to their mutual inhibition. All inhibitions could be relieved to a certain degree by augmenting an organic electron donor, but the impact of the added electron donor was strongest for TCP. For simultaneous reduction of TCP together with nitrate, TCP’s removal rate value increased 75% and 150%, respectively, when added glucose was increased from 0.4 mmol∙L–1 to 0.5 mmol∙L–1 and to 0.76 mmol∙L–1. For comparison, the removal rate for nitrate increased by only 25% and 114% for the same added glucose. The relationship between their initial biodegradation rates versus their initial concentrations could be represented well with the Monod model, which quantified their half-maximum-rate concentration (K S value), and K S values for TCP, nitrate, and nitrite were larger with simultaneous reduction than independent reduction. The increases in K S are further evidence that competition for the electron donor led to mutual inhibition. For bioremediation of wastewater containing TCP and oxidized nitrogen, both reduction reactions should proceed more rapidly if the oxidized nitrogen is nitrite instead of nitrate and if readily biodegradable electron acceptor is augmented.
Competition for electrons between reductive dechlorination and denitrification
Abstract It is common that 2,4,6-trichlorophenol (TCP) coexists with nitrate or nitrite in industrial wastewaters. In this work, simultaneous reductive dechlorination of TCP and denitrification of nitrate or nitrite competed for electron donor, which led to their mutual inhibition. All inhibitions could be relieved to a certain degree by augmenting an organic electron donor, but the impact of the added electron donor was strongest for TCP. For simultaneous reduction of TCP together with nitrate, TCP’s removal rate value increased 75% and 150%, respectively, when added glucose was increased from 0.4 mmol∙L–1 to 0.5 mmol∙L–1 and to 0.76 mmol∙L–1. For comparison, the removal rate for nitrate increased by only 25% and 114% for the same added glucose. The relationship between their initial biodegradation rates versus their initial concentrations could be represented well with the Monod model, which quantified their half-maximum-rate concentration (K S value), and K S values for TCP, nitrate, and nitrite were larger with simultaneous reduction than independent reduction. The increases in K S are further evidence that competition for the electron donor led to mutual inhibition. For bioremediation of wastewater containing TCP and oxidized nitrogen, both reduction reactions should proceed more rapidly if the oxidized nitrogen is nitrite instead of nitrate and if readily biodegradable electron acceptor is augmented.
Competition for electrons between reductive dechlorination and denitrification
Cao, Lifeng (author) / Sun, Weihua (author) / Zhang, Yuting (author) / Feng, Shimin (author) / Dong, Jinyun (author) / Zhang, Yongming (author) / Rittmann, Bruce E. (author)
Frontiers of Environmental Science & Engineering ; 11 ; 1-10
2017-06-10
10 pages
Article (Journal)
Electronic Resource
English
Reductive dechlorination of hexachlorofullerene with diisopropylethylamine
| British Library Online Contents | 2014
Reductive Dechlorination of PCBs Using Photocatalyzed UV Light
| Online Contents | 2012
Invariant chlorine isotopic signatures during microbial PCB reductive dechlorination
| Online Contents | 2004
Reductive dechlorination pathways of chloro organics under anaerobic conditions
| British Library Conference Proceedings | 1996