Effects of external carbon source and empty bed contact time on simultaneous heterotrophic and sulfur-utilizing autotrophic denitrification

Bacterial community and nitrate removal by simultaneous heterotrophic and autotrophic denitrification in a bioelectrochemically-assisted constructed wetland

“…Heterotrophic denitrification is highly related to the oxidation of organic matter, which usually requires above 3.0 g of COD to remove 1.0 g of NO 3 − -N owing to the presence of oxygen and the cell synthesis of microorganisms (Lee et al, 2001). Moreover, microbial heterotrophic denitrification is considered the dominant N sink in many conventional CWs (Zhi & Ji, 2014), and an optimal COD/N ratio ranging from 5 to 12 was proposed to achieve good nitrogen removal performance (Pous et al, 2014;Song et al, 2016b;Zhao et al, 2011).…”

Study of a combined heterotrophic and sulfur autotrophic denitrification technology for removal of nitrate in water

“…Only very few studies [22][23][24] focus on combined heterotrophic and autotrophic process for waste water denitrification. For drinking water, there was no report on combined heterotrophic and autotrophic denitrification process.…”

How Temperature Affects Wastewater Nitrate Removal in a Bioelectrochemically Assisted Constructed Wetland System

“…Previous studies showed that the quantity of electron donors (hydrogen concentration) are completely dependent on current density and HRT, and higher current density and longer HRT in a certain range could lead to a higher denitrification rate, thus decreasing the nitrate and nitrite concentrations of the effluent [19,26,32]. Besides, the coexistence of autotrophic and heterotrophic denitrification processes prevailing in BESs can improve denitrification efficiency, reduce the consumption of electrical energy, and buffer the pH [33][34][35]. Thus, adding a small amount of organic carbon source could also be a possible solution to enhancing the denitrification efficiency of BECW at low temperatures.…”