Denitrification coupled with methane oxidation in a membrane bioreactor after methanogenic pre-treatment of wastewater
| Autor: | Juan M. Garrido, Iñaki Tejero, A.L. Esteban-García, Leticia Rodríguez-Hernández, Dagmara Buntner, A. Sánchez |
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| Rok vydání: | 2016 |
| Předmět: |
Denitrification
General Chemical Engineering 0208 environmental biotechnology 02 engineering and technology 010501 environmental sciences Membrane bioreactor complex mixtures 01 natural sciences Methane Inorganic Chemistry chemistry.chemical_compound Aerobic denitrification Bioreactor Waste Management and Disposal 0105 earth and related environmental sciences Renewable Energy Sustainability and the Environment Chemistry Organic Chemistry Pollution Anoxic waters 020801 environmental engineering Fuel Technology Anammox Environmental chemistry Anaerobic oxidation of methane Biotechnology |
| Zdroj: | Journal of Chemical Technology & Biotechnology. 91:2950-2958 |
| ISSN: | 0268-2575 |
| Popis: | BACKGROUND The presence of dissolved methane is an important environmental problem related to greenhouse gas emissions from wastewater treated in methanogenic bioreactors. Methane has a global warming potential of 28. For low-strength wastewaters, such as sewage, dissolved methane could account for up to 50% of the total methane produced. Dissolved methane is easily desorbed from effluents when released into the environment or post-treated in aerobic bioreactors. The use of dissolved methane as a carbon source for biological denitrification has been proposed as an alternative for reducing both greenhouse gas emissions and nitrogen concentrations in treated wastewater. RESULTS The effluent of a methanogenic reactor operating at ambient temperature was post-treated in a two-compartment biological membrane bioreactor (MBR). The first compartment consisted of an anoxic denitrification reactor in which dissolved methane was oxidized. The second compartment was an aerobic membrane filtration reactor. Up to 60% nitrogen removal and 95% methane consumption were observed. Batch experiments indicated the presence of microorganisms that were capable of denitrification using dissolved methane. CONCLUSIONS Denitrification using dissolved methane as a carbon source was feasible in an anoxic–aerobic MBR system. Denitrification resulted from a mixture of aerobic and anaerobic methane oxidizing bacteria, anammox and heterotrophic bacteria activity. © 2016 Society of Chemical Industry |
| Databáze: | OpenAIRE |
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