Journal of Environmental Engineering · 1995 · 57 citations · 19 references
Life SciencesBiotechnologyEnvironmental EngineeringBiochemical EngineeringMicrobial MetabolismWastewater TreatmentAnaerobic DigestionBiodegradationBiological Treatment ProcessesEnvironmental Microbial BiotechnologySludge TreatmentWastewater BiotreatmentAnaerobic BiodegradationAnaerobic Microbial ProcessesAnaerobic TreatmentAnaerobic Treatment ProcessesChemical Oxygen DemandHydraulic Retention TimeUpflow Anaerobic Sludge Blanket DigestionWastewater Anaerobic Treatment
The upflow anaerobic sludge blanket (UASB) process removed 97–99% of soluble chemical oxygen demand (COD) from wastewater containing concentrated benzoate at 37°C, pH 7.5, a hydraulic retention time of 9.8 h, and loading rates up to 30.6 g-COD/(Ls˙day) based on the reactor volume. About 95.2% of the total COD removed was converted to methane; 0.034 g of volatile suspended solids (VSS) was yielded for each gram of COD removed. The highly settleable granules were 1–3 mm in size with a layered microstructure and were composed in abundance of bacteria resembling the benzoate-degrading Syntrophus buswellii . Two interesting observations have led to the postulation that the degradation of benzoate into acetate was probably conducted completely inside the cell of Syntrophus buswellii -like bacteria: (1) No fatty acids except acetate were found in the effluent; and (2) the granules showed very limited butyrate-degrading capability and could not degrade propionate. This study demonstrated the feasibility of removing aromatic pollutants in wastewater by anaerobic processes.
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Bioassay for monitoring biochemical methane potential and anaerobic toxicity
William F. Owen, David C. Stuckey, J.B. Healy et al. · Water Research · 1979 · 1.5K citations