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174 results on '"Lansing, Stephanie"'

35. Small-scale digesters in Costa Rica

Author

Lansing, Stephanie, Botero, Raul Botero, and Martin, Jay

Subjects
Compost plants -- Management, Agricultural wastes -- Management, Biogas -- Usage, Biogas -- Economic aspects, Company business management, Business, Environmental issues, Environmental services industry
Abstract

The small-scale digesters treating agricultural wastewater and producing energy are analyzed in order to explore different ways for increasing the efficiency of the systems. The analysis has shown that the small-scale digesters can provide methane and electricity to meet household needs resulting in increase in household income and decrease in water pollution and deforestation.

Published
2007

43. Methane and Hydrogen Sulfide Production from Co-Digestion of Gummy Waste with a Food Waste, Grease Waste, and Dairy Manure Mixture

Author

Lansing, Stephanie and Lansing, Stephanie

Abstract

Co-digestion of dairy manure with waste organic substrates has been shown to increase the methane (CH4) yield of farm-scale anaerobic digestion (AD). A gummy vitamin waste (GVW) product was evaluated as an AD co-digestion substrate using batch AD testing. The GVW product was added at four inclusion levels (0%, 5%, 9%, and 23% on a wet mass basis) to a co-digestion substrate mixture of dairy manure (DM), food-waste (FW), and grease-waste (GW) and compared to mono-digestion of the GVW, DM, FW, and GW substrates. All GVW co-digestion treatments significantly increased CH4 yield by 126–151% (336–374 mL CH4/g volatile solids (VS)) compared to DM-only treatment (149 mL CH4/g VS). The GVW co-digestion treatments also significantly decreased the hydrogen sulfide (H2S) content in the biogas by 66–83% (35.1–71.9 mL H2S/kg VS) compared to DM-only (212 mL H2S/kg VS) due to the low sulfur (S) content in GVW waste. The study showed that GVW is a potentially valuable co-digestion substrate for dairy manure. The high density of VS and low moisture and S content of GVW resulted in higher CH4 yields and lower H2S concentrations, which could be economically beneficial for dairy farmers.

Published
2019

44. Ammonia capture with biogas purification from anaerobically digested poultry litter.

Author

Witarsa, Freddy, Lupitskyy, Robert, Moss, Andrew, Kulow, Anna, and Lansing, Stephanie

Subjects
POULTRY litter, HYDROGEN sulfide, BIOGAS, AMMONIA, AMMONIUM chloride, CHEMICAL industry, CARBON dioxide
Abstract

BACKGROUND Poultry litter (PL) has a high solid and organic nitrogen content that is converted into NH3 during anaerobic digestion (AD), requiring the dilution of PL influent prior to AD. With nutrients extracted from the AD effluent, the water could be reused for influent dilution or for other purposes, while creating a designer nutrient product from the PL matrix. The study goal was to determine the effectiveness of an ammonia (NH3)‐stripping and scrubbing system to remove and capture NH3 from anaerobically digested PL. After NH3 stripping, a novel, patent‐pending dual‐vessel NH3‐scrubber system was designed to simultaneously capture the stripped NH3 while producing higher quality biogas through partial removal of non‐combustible carbon dioxide (CO2) and corrosive hydrogen sulfide (H2S). RESULTS: The stripping reactor reduced total ammonia nitrogen (TAN) by 84.6–90.4% when loaded with an ammonium chloride solution or screened PL digestate after 4 h, while the scrubber captured 73.3–76.2% of the stripped NH3 when proxy biogas streams (59–60% CH4, 40% CO2) with two H2S concentrations (0.1 or 1% H2S) were used. The scrubber reduced CO2 and H2S concentrations in the biogas by 3.9% and 23–29%, respectively. CONCLUSION: The study demonstrated a novel NH3 stripping‐and‐scrubbing system that successfully reduced TAN in anaerobic digestate, captured the stripped NH3, and reduced CO2 and H2S concentrations in biogas. The novel design can be used to increase the adoption of AD for PL by providing a useful NH3 fertilizer, wastewater with less NH3, and a biogas stream with less H2S. © 2020 Society of Chemical Industry (SCI) [ABSTRACT FROM AUTHOR]

Published
2021
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45. Evaluating digester design for electricity generation

Author

Viquez, Joaquin, Lansing, Stephanie, and Martinez, Helen

Subjects
Sewer systems -- Usage, Waste-to-energy power plants -- Management, Biogas -- Production management, Company business management, Business, Environmental issues, Environmental services industry
Abstract

The article discusses the design, construction and the advantages of a biodigester that is used to produce electricity by the action of anaerobic digestion of livestock manure. The equipment is found to produce high quality biogas while increasing the fertilizer quality of the manure but needs some technical improvements for better results.

Published
2008

47. Trends in Antimicrobial Resistance Genes in Manure Blend Pits and Long-Term Storage Across Dairy Farms with Comparisons to Antimicrobial Usage and Residual Concentrations

Author

Hurst, Jerod J., primary, Oliver, Jason P., additional, Schueler, Jenna, additional, Gooch, Curt, additional, Lansing, Stephanie, additional, Crossette, Emily, additional, Wigginton, Krista, additional, Raskin, Lutgarde, additional, Aga, Diana S., additional, and Sassoubre, Lauren M., additional

Published
2019
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