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1.
Water Environ Res ; 85(5): 387-90, 2013 May.
Article in English | MEDLINE | ID: mdl-23789567

ABSTRACT

The effectiveness of degasification using a degassing membrane to improve chemical oxygen demand (COD) removal efficiency was investigated using a bench-scale upflow anaerobic sludge blanket (UASB) reactor. Vacuum degasification was able to transfer dissolved gas in the bulk liquid of the UASB reactor inside the membrane. Such a process might provide thermodynamically favorable conditions for the degradation of organic compounds. The COD-removal efficiency improved from 83% during normal operation to 90% during the degassing operation.


Subject(s)
Bioreactors , Membranes, Artificial , Anaerobiosis , Hydrogen Peroxide , Hydrogen-Ion Concentration , Oxygen/chemistry , Oxygen/metabolism , Phenols/chemistry , Waste Disposal, Fluid/methods , Water/chemistry , Water Pollutants, Chemical , Water Purification
2.
Bioresour Technol ; 133: 437-42, 2013 Apr.
Article in English | MEDLINE | ID: mdl-23454390

ABSTRACT

Temperature is an important environmental variable that can strongly affect the performance of anaerobic reactors working at ambient temperatures. This study presents a mechanistic mathematical model which depends in an explicit way on the operating temperature. The cardinal temperature model function is proposed to describe the temperature dependence of the kinetic parameters and the experimental data from an UASB-degasification system was used to calibrate and validate the model. The performance of the model is compared with the classic Arrhenius approach. The results showed that the temperature-based model of the anaerobic digestion is able to reproduce a long-term reactor operation in terms of biogas production and the concentration of organic matter at fluctuating ambient temperature.


Subject(s)
Bioreactors , Models, Theoretical , Sewage , Temperature , Wastewater , Water Purification/instrumentation , Water Purification/methods , Anaerobiosis , Biodegradation, Environmental , Calibration , Family Characteristics , Reproducibility of Results
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