Evaluation of alternative electron donors for denitrifying moving bed biofilm reactors (MBBRs)

Water Science and Technology : a Journal of the International Association on Water Pollution Research
K A BillS Murthy

Abstract

The effectiveness of four different electron donors, specifically methanol, ethanol, glycerol, and sulfide (added as Na(2)S), were evaluated in post-denitrifying bench-scale moving bed biofilm reactors (MBBRs). With the requirement for more wastewater treatment plants to reach effluent total nitrogen levels approaching 3 mg/L, alternative electron donors could promote more rapid MBBR startup/acclimation times and increased cold weather denitrification rates compared to methanol, which has been most commonly used for post-denitrification processes due to low cost and effectiveness. While the application of alternative substrates in suspended growth processes has been studied extensively, fixed film post denitrification processes have been designed to use primarily low yield substrates like methanol. Bench-scale MBBRs were operated continuously at 12 degrees Celsius, and performance was monitored by weekly sampling and insitu batch profile testing. Ethanol and glycerol, though visually exhibited much higher biofilm carrier biomass content, performed better than methanol in terms of removal rate (0.9 and 1.0 versus 0.6 g N/m(2)/day, respectively.) Maximum denitrification rate measurements from profile testing suggested that ethano...Continue Reading

Citations

Sep 24, 2014·International Journal of Environmental Research and Public Health·Takahiro Yamashita, Ryoko Yamamoto-Ikemoto
Jul 12, 2016·Biotechnology Advances·Jianlong Wang, Libing Chu
Jan 31, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Tri LeHaydée De Clippeleir
May 11, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Tri LeHaydée De Clippeleir
Jul 15, 2011·Water Environment Research : a Research Publication of the Water Environment Federation·James P McQuarrie, Joshua P Boltz

❮ Previous
Next ❯

Related Concepts

Related Feeds

Bioremediation (ASM)

Bioremediation is the treatment and removal of harmful pollutants or contaminants through the use of microorganisms. Discover the latest research here.

Biofilm & Infectious Disease

Biofilm formation is a key virulence factor for a wide range of microorganisms that cause chronic infections.Here is the latest research on biofilm and infectious diseases.