Nitrate removal from groundwater by a novel three-dimensional electrode biofilm reactor

Performance and recent improvement in microbial fuel cells for simultaneous carbon and nitrogen removal: A review

“…Huang et al (2013b) found that increasing the C/N ratio benefited the nitrate removal of the MFC and inhibited nitrite accumulation. Zhou et al (2007) developed a three-dimensional biofilm electrode reactor to remove nitrate and organic pollutants, and they found that nitrite accumulation increased significantly when the C/N ratio decreased from 2.5 to 0.97.…”

Effective Removal of Nitrates Ions from Aqueous Solution Using New Clay as Potential Low-Cost Adsorbent

“…The excessive application of fertilizers in agriculture causes the infiltration of large quantities of this ion into underground and surface water [2]. Nitrate, due to its high water solubility [3], is possibly the most widespread groundwater contaminant in the world, imposing a serious threat to drinking water supplies and promoting eutrophication [4] [5].…”

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

“…However, the nitrogen forms of the BECW along reactor height opera-ting at 18±1ºC was rather different. The effluent concentration of NO 3 --N at the height of 40 cm decreased to 2.83±0.62 mg N L -1 at 18±1ºC, which was lower than that at 29±1ºC , and a temperature lower than 25ºC or higher than 40ºC would lead to a significant accumulation of nitrite [26]. In this study, temperature also played an important role for nitrite evolution, and the low temperature was responsible for the accumulation of nitrite in the cathode region of BECW at 18±1ºC.…”

“…In BERs, electrical current plays a key role in providing suitable hydrogen concentration for hydrogenotrophic bacteria and achieving a high rate of denitrification [31]. 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].…”