Process coupling of anaerobic and aerobic biofilms for treatment of contaminated waste liquids

Guiot, Serge R.

doi:10.1016/s0166-1116(97)80073-8

Cited by 3 publications

(3 citation statements)

References 27 publications

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“…Most importantly, high-rate anaerobic treatment systems have been developed. Among these systems, the upflow anaerobic sludge bed (UASB) reactor is the most widely used in the treatment of domestic and industrial wastewater due to its low-cost and adequate treatment efficiency, which is connected with its ability to retain high biomass concentrations despite the upflow velocity of the wastewater and the production of biogas, and to accommodate low concentrations of oxygen without negatively affecting the integrity or metabolic activity of the granular biomass [31,53,82,89]. In UASB reactors, the biomass is retained as granules, formed by the natural self-immobilization of the bacteria.…”

Section: Treatment Of Lipid-rich Wastewater In Upflow Anaerobic Sludgmentioning

confidence: 99%

“…In UASB reactors, the biomass is retained as granules, formed by the natural self-immobilization of the bacteria. Although UASB reactors have been well characterized, and their usefulness for treatment of municipal and industrial wastes well documented [31,100], their treatment failures have also been reported when treating lipid-rich wastewater [75]. As shown in Table 4, both low and high COD removals are experienced during the treatment of wastewater containing long-chain fatty acids in UASB reactors.…”

Section: Treatment Of Lipid-rich Wastewater In Upflow Anaerobic Sludgmentioning

confidence: 99%

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Behavior of lipids in biological wastewater treatment processes

Chipasa

Mędrzycka

2006

J IND MICROBIOL BIOTECHNOL

132

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Lipids (characterized as oils, greases, fats and long-chain fatty acids) are important organic components of wastewater. Their amount, for example, in municipal wastewater is approximately 30-40% of the total chemical oxygen demand. The concern over the behavior of lipids in biological treatment systems has led to many studies, which have evaluated their removal, but still the exact behavior of lipids in these processes is not well understood. In this review, we discuss the current knowledge of how lipids/fatty acids affect both aerobic and anaerobic processes and specific methods that have been used in an attempt to enhance their removal from wastewater. Overall, the literature shows that lipids/fatty acids are readily removed by biological treatment methods, inhibitory to microbial growth as well as the cause of foaming, growth of filamentous bacteria and floc flotation.

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Section: Treatment Of Lipid-rich Wastewater In Upflow Anaerobic Sludgmentioning

confidence: 99%

Section: Treatment Of Lipid-rich Wastewater In Upflow Anaerobic Sludgmentioning

confidence: 99%

Behavior of lipids in biological wastewater treatment processes

Chipasa

Mędrzycka

2006

J IND MICROBIOL BIOTECHNOL

132

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“…Upflow anaerobic sludge blanket (UASB) reactors have been characterized well, and the usefulness of these reactors for treatment of municipal and industrial wastes has been welldocumented (28). UASB reactors can accommodate low concentrations of oxygen without deleterious effects on the integrity or metabolic activity of the granular biomass (13,23). Thus, a partially aerated UASB reactor contains the substrates required by methanotrophic bacteria (i.e., indigenously produced methane and exogenously added oxygen) and may, therefore, be an ideal system for maintaining consortia composed of methanogens and methanotrophs.…”

mentioning

confidence: 99%

Monitoring Methanotrophic Bacteria in Hybrid Anaerobic-Aerobic Reactors with PCR and a Catabolic Gene Probe

Míguez

Shen

Bourque

et al. 1999

Appl Environ Microbiol

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We attempted to mimic in small upflow anaerobic sludge bed (UASB) bioreactors the metabolic association found in nature between methanogens and methanotrophs. UASB bioreactors were inoculated with pure cultures of methanotrophs, and the bioreactors were operated by using continuous low-level oxygenation in order to favor growth and/or survival of methanotrophs. Unlike the reactors in other similar studies, the hybrid anaerobic-aerobic bioreactors which we used were operated synchronously, not sequentially. Here, emphasis was placed on monitoring various methanotrophic populations by using classical methods and also a PCR amplification assay based on themmoX gene fragment of the soluble methane monooxygenase (sMMO). The following results were obtained: (i) under the conditions used, Methylosinus sporium appeared to survive better than Methylosinus trichosporium; (ii) the PCR method which we used could detect as few as about 2,000 sMMO gene-containing methanotrophs per g (wet weight) of granular sludge; (iii) inoculation of the bioreactors with pure cultures of methanotrophs contributed greatly to increases in the sMMO-containing population (although the sMMO-containing population decreased gradually with time, at the end of an experiment it was always at least 2 logs larger than the initial population before inoculation); (iv) in general, there was a good correlation between populations with the sMMO gene and populations that exhibited sMMO activity; and (v) inoculation with sMMO-positive cultures helped increase significantly the proportion of sMMO-positive methanotrophs in reactors, even after several weeks of operation under various regimes. At some point, anaerobic-aerobic bioreactors like those described here might be used for biodegradation of various chlorinated pollutants.

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