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While the application of alternative substrates in suspended growth processes has been studied ex... more 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. Autotrophic denitrification using reduced sulfur compounds could be a low yield alternative to conventional heterotrophic denitrification to polish effluent nitrate. Three lab-scale MBBRs (using sulfide, methanol and ethanol as electron donor sources) were operated continuously at 12°C. The performance of each reactor was monitored by weekly sampling and batch rate profile testing. Sulfide visually exhibited biofilm carrier biomass content similar to or slightly less than that of methanol, yet provided increased removal rates (1.1±0.5 versus 0.6±0.3 g NO X-N/m 2 /day, respectively.) SDNR profile testing also suggested that maximum NO X-N removal rates for sulfide (1.8 g NO X-N/m 2 /day) were more than three times that of methanol (0.57 g NO X-N/m 2 /day.) Although the sulfide reactor produced the highest removal rates, significant uncertainties must be addressed prior to full-scale implementation.
Water Science and Technology, 2009
The effectiveness of four different electron donors, specifically methanol, ethanol, glycerol, an... more The effectiveness of four different electron donors, specifically methanol, ethanol, glycerol, and sulfide (added as Na2S), 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°C, and performance was monitored by weekly sampling and insitu batch profile testing. Ethanol and glycerol, though visually exhibited much...
While the application of alternative substrates in suspended growth processes has been studied ex... more 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. Autotrophic denitrification using reduced sulfur compounds could be a low yield alternative to conventional heterotrophic denitrification to polish effluent nitrate. Three lab-scale MBBRs (using sulfide, methanol and ethanol as electron donor sources) were operated continuously at 12°C. The performance of each reactor was monitored by weekly sampling and batch rate profile testing. Sulfide visually exhibited biofilm carrier biomass content similar to or slightly less than that of methanol, yet provided increased removal rates (1.1±0.5 versus 0.6±0.3 g NO X-N/m 2 /day, respectively.) SDNR profile testing also suggested that maximum NO X-N removal rates for sulfide (1.8 g NO X-N/m 2 /day) were more than three times that of methanol (0.57 g NO X-N/m 2 /day.) Although the sulfide reactor produced the highest removal rates, significant uncertainties must be addressed prior to full-scale implementation.
Water Science and Technology, 2009
The effectiveness of four different electron donors, specifically methanol, ethanol, glycerol, an... more The effectiveness of four different electron donors, specifically methanol, ethanol, glycerol, and sulfide (added as Na2S), 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°C, and performance was monitored by weekly sampling and insitu batch profile testing. Ethanol and glycerol, though visually exhibited much...