Denitrification of high NO3(-)-N containing wastewater using elemental sulfur; nitrogen loading rate and N2O production

Environmental Technology
J H ParkJ H Bae

Abstract

The effects of both concentration and loading rates of nitrate on denitrification efficiency and N2O production during the autotrophic denitrification with elemental sulfur were evaluated. Experiments were conducted with three continuously fed sulfur packed bed reactors (SPBRs) with different influent nitrate concentrations. The loading rate at which nitrate removal efficiency was greater than 95% decreased from 2.46 to 1.64 kg NO3(-)-N m(-3) day(-1) as the influent NO3(-)-N concentration increased from 175 to 700 mg 1(-1). The nitrate removal rate per unit volume of sulfur layer can be expressed as alpha (ALR)n, where ALR is the applied loading rate. The range of alpha and n values were 0.72-0.83 and 0.91-0.94, respectively. The maximum nitrate removal rate was estimated as 3.9 to 4.5 kg NO3(-)-N m(-3) day(-1) depending on the influent NO3(-)-N concentration. The loading rate for complete denitrification without N2O production was 1.37 kg NO3(-)-N m(-3) day(-1) at the influent NO3(-)-N concentration of 175 mg 1(-1). N2O production became significant when the influent nitrate concentration increased while the loading rate remained the same. The batch test indicated that the amount of N2O production per unit mass of nitrogen was...Continue Reading

Citations

Nov 20, 2013·Journal of Hazardous Materials·Maikel FernándezDomingo Cantero
Sep 3, 2010·Applied Microbiology and Biotechnology·Ming-Fei ShaoHerbert Han-Ping Fang
Aug 13, 2009·Journal of Industrial Microbiology & Biotechnology·Francisco J CervantesJorge Gómez
Oct 1, 2014·Bioprocess and Biosystems Engineering·Erkan Sahinkaya, Nesrin Dursun
Mar 20, 2015·Environmental Science and Pollution Research International·Vaishali Ashok, Subrata Hait
Jan 18, 2008·Water Environment Research : a Research Publication of the Water Environment Federation·Sukalyan SenguptaErika Lopez-Luna
Nov 25, 2018·Membranes·Thi-Kim-Quyen VoHan-Seung Kim
Oct 26, 2021·Biotechnology and Bioengineering·Lan WuBing-Jie Ni

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