Growth, Enzymes and Microbial Activities of Two Leguminous Plants Grown on Soils Contaminated with Heavy Metals

Haddad, Samir A.; Ahmed, Marwa Mr Mohmoud; El-Azeim, M. M. Abd

doi:10.5455/egyjebb.20170306024053

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“…Excessive inputs of nitrogenous compounds such as nitrate have resulted in an exorbitant increase in their levels in both soil and water. These inputs come from agricultural activities such as intensive application of nitrogen fertilizers (Haddad et al 2013;Rahmati et al 2015) and pesticides leading to their seepage into soil and groundwater (Menció et al 2016;Haddad et al 2017;Gutiérrez et al 2018). Nonagricultural sources such as animal waste from the farming industry (Brindha and Elango 2014), discharge of industrial and domestic effluents (Nazir et al 2020), and agricultural runoffs also cause nitrate pollution especially in surface waters (Paredes et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Heterotrophic aerobic denitrification by novel bacterium Georgenia daeguensis ARB2 for treatment of nitrate contaminated waters

Rajta

Setia

Shukla

et al. 2021

Int. J. Environ. Sci. Technol.

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Denitrification is a potential strategy for nitrate removal from wastewater. This study reports the isolation of a novel bacterium Georgenia daeguensis ARB2 which has not been earlier reported for treatment of wastewater. ARB2 was isolated from pharmaceutical wastewater and optimized for growth and nitrate removal under conditions of 10 mM nitrate stress (140 mgL −1 NO − 3 − N ). It can utilize nitrate as a sole source of nitrogen, exhibits highest growth and aerobic denitrification using glycogen + maltose as a carbon source at pH 7.0, carbon-to-nitrogen ratio of 34, temperature 30 °C, and shaking speed of 100 rpm. ARB2 removes 20% of the initial nitrate concentration of 10 mM in 56 h, and 40% of the initial nitrate concentration of 1 mM in 52 h. Further, the efficacy of strain ARB2 was tested on real contaminated waters and was found to successfully reduce nitrate levels in them. The findings suggest that Georgenia daeguensis ARB2 has a potential application for the alleviation of nitrate under aerobic conditions.

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