Investigation of solid-phase buffers for sulfur-oxidizing autotrophic denitrification

Water Environment Research : a Research Publication of the Water Environment Federation
Sukalyan SenguptaErika Lopez-Luna

Abstract

This paper investigates biological denitrification using autotrophic microorganisms that use elemental sulfur as an electron donor. In this process, for each gram of nitrate-nitrogen removed, approximately 4.5 g of alkalinity (as calcium carbonate) are consumed. Because denitrification is severely inhibited below pH 5.5, and alkalinity present in the influent wastewaters is less than the alkalinity consumed, an external buffer was needed to arrest any drop in pH from alkalinity consumption. A packed-bed bioreactor configuration is ideally suited to handle variations in flow and nitrate loading from decentralized wastewater treatment systems, as it is a passive system and thus requires minimal maintenance; therefore, a solid-phase buffer packed with the elemental sulfur in the bioreactor is most suitable. In this research, marble chips, limestone, and crushed oyster shells were tested as solid-phase buffers. Bench- and field-scale studies indicated that crushed oyster shell was the most suitable buffer based on (1) the rate of dissolution of buffer and the buffering agent released (carbonate, bicarbonate, or hydroxide), (2) the ability of the buffer surface to act as host for microbial attachment, (3) turbidity of the solution u...Continue Reading

Citations

Jan 10, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Shuang TongSarina J Ergas
May 5, 2017·Journal of Biological Engineering·E V Lopez-PonnadaJ R Mihelcic
Aug 21, 2009·Water Environment Research : a Research Publication of the Water Environment Federation·Ashish K SahuSarina J Ergas
Jun 19, 2019·Applied Microbiology and Biotechnology·Yan-Xiang CuiDi Wu
May 15, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Mathis von AhnenJohanne Dalsgaard
May 11, 2020·Bioresource Technology·Qiaochong HeSarina J Ergas
Jul 17, 2009·Environmental Science & Technology·Ashish K SahuSarina J Ergas

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