Mechanisms of nitrous oxide emission during photoelectrotrophic denitrification by self-photosensitized Thiobacillus denitrificans

Biophotoelectrochemistry for renewable energy and environmental applications

“…The excellent performance could partly be attributed to the increase of humic acid and protein content in EPS, which significantly accelerated the photoelectron transfer by acting as electron mediators (Zhu et al, 2018a). The denitrification performance of the T. denitrificans-CdS system was found to be sensitive to the input nitrate and nitrite (NO ), and hydroxyl radicals ($OH) to the inhibition of N 2 O reduction were >15.0%, >5.4% and 1.3% for a reduction of 13.5 mg/L NO 3 --N, respectively (Chen et al, 2020a). To weaken the inhibiting effect of ROS, a Mn 3 O 4 nanozyme-coated BPEC system (T. denitrificans-CdS@Mn 3 O 4 ) was constructed and significantly reduced the concentrations of multiple ROS for stable microbial viability, resulting in a 28% higher NO 3 reduction and 78% lower emission of N 2 O than that of the T. denitrificans-CdS system (Chen et al, 2020b).…”

Feasibility and mechanism of light-driven nitrogen reduction to ammonium by a <italic>Pseudomonas stutzeri</italic>-CdS semi-artificial photosynthetic system

“…Sakimoto等人 [20] 构建了Moorella thermoacetica-CdS系 统, 实现CO 2 还原为单一产物乙酸, 光量子效率可达 2.44%; 2018年, Wei等人 [21] 构建了Escherichia coli-CdS系统, 实现光催化产氢, 氢气的最高产率达 [22,23] 、CO 2 还原至CH 4 [24] 和有机物的还原降解 [25] .…”

Study on enzyme activity inhibition mechanism of Thiobacillus denitrification intracellular enzyme to sulfate-reducing bacteria intracellular enzyme

“…SRB screened from experimental soil, which cultures were inoculated in sterile Postgate C medium containing the following (Chen et al , 2020): 0.5 g K 2 HPO 4 , 1.0 g NH 4 Cl, 0.06 g CaCl 2 ·6H 2 O, 0.06 g MgSO 4 ·7H 2 O, 6 mL of 70% sodium lactate, 1.0 g yeast cream, 0.3 g sodium citrate and 1 L deionized water. The SRB was separated and purified by diluting the coating-stacking laminate culture separation method.…”

“…Researchers have studied many bacterial species, such as iron-oxidizing bacteria, manganese-oxide bacteria, sulfur oxidizing bacteria, archaea and Thiobacillus denitrificans (TDN) (Liu et al, 2020). Now, there are four main mechanisms of microbial anticorrosion, nutritional competition mechanism (Liu et al, 2017;Grigoryan et al, 2008;Eckford and Fedorak, 2002;Nemati et al, 2001), enzyme activity suppression mechanism (Auld et al, 2009;Hubert et al, 2005;McCosh et al, 2019), secretion suppression mechanisms (Selker et al, 2016;Zuo, 2007;Sevov et al, 2016) and redox potential improvement mechanism (Senior et al, 2015;Hojo et al, 2007;Chen et al, 2020). The mechanism of nutritional competition can satisfactorily explain the inhibition effect of heteronitrate reduction bacteria on SRB.…”