Title:
Potential of Nitratireductor Sp. OM-1 to Produce More Short-Chain Esters and Less Excess Sludge during Wastewater Treatment
Author(s):
Okamura, Y., Nakai, S., Takahashi, H., Miura, T., Tajima, T., Aki, T., Matsumura, Y., Nakashimada, Y.
Document(s):
Paper
Abstract:
Methane fermentation consists of hydrolysis/acidogenesis, acetogenesis and methanogenesis. Volatile fatty acids (VFAs) are generated during hydrolysis/acidogenesis and are converted into acetate and hydrogen, which are then converted into methane. A high organic loading rate results in VFAs in the fermentation residue. Nitratireductor sp. strain OM-1 can produce oils from VFAs and was used to treat wastewater derived from methane production from brown algae in this study. Chemical oxygen demand (COD) and total organic acids in the initial wastewater were 6,339 mg/L and 928 mg /L, respectively. Co-cultivation of strain OM-1 with microbes in the wastewater under the aerobic conditions for 7 days reduced COD by 91.1 % and organic acids were completely consumed. The lipid yield was 22.5 mg/L and sludge production was effectively reduced. These results suggest that wastewater treatment using Nitratireductor sp. strain OM-1 can reduce excess sludge and is advantageous for biofuel production, and methane fermentation residues have potential as substrates for the production of useful materials.
Keywords:
biodiesel, biological conversion, biomass, sludge, wastewater treatment
Topic:
Biomass Conversion Technologies for Fuels, Chemicals and Materials
Subtopic:
Oil-based biofuels
Event:
26th European Biomass Conference and Exhibition
Session:
3AO.3.2
Pages:
917 - 920
ISBN:
978-88-89407-18-9
Paper DOI:
10.5071/26thEUBCE2018-3AO.3.2
Price:
FREE
