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Ecophysiology of syntrophic communities that degrade saturated and unsaturated ...

Syntrophic relationships are the key for biodegradation in methanogenic environments. We review the ecological and physiological features of syntrophic communities involved in the degradation of saturated and unsaturated long-chain fatty acids (LCFA), as well as their potential application to convert lipids/fats containing waste to biogas. Presently, about 14 species have been described with the ability to grow...

Waste lipids to energy : how to optimize methane production from long-chain fat...

The position of high-rate anaerobic technology (HR-AnWT) in the wastewater treatment and bioenergy market can be enhanced if the range of suitable substrates is expanded. Analyzing existing technologies, applications and problems, it is clear that, until now, wastewaters with high lipids content are not effectively treated by HR-AnWT. Nevertheless, waste lipids are ideal potential substrates for biogas producti...

Effect of sulfate on methanogenic communities that degrade unsaturated and satu...

Anaerobic bacteria involved in the degradation of long-chain fatty acids (LCFA), in the presence of sulfate as electron acceptor, were studied by combined cultivation-dependent and molecular techniques. The bacterial diversity in four mesophilic sulfate-reducing enrichment cultures, growing on oleate (C18:1, unsaturated LCFA) or palmitate (C16:0, saturated LCFA), was studied by denaturing gradient gel electroph...

Anaerobic microbial LCFA degradation in bioreactors

This paper reviews recent results obtained on long-chain fatty acids (LCFA) anaerobic degradation. Two LCFA were used as model substrates: oleate, a mono-unsaturated LCFA, and palmitate, a saturated LCFA, both abundant in LCFA-rich wastewaters. 16S rRNA gene analysis of sludge samples submitted to continuous oleate- and palmitate-feeding followed by batch degradation of the accumulated LCFA demonstrated that ba...

Syntrophic LCFA-degraders : “bacteria that can clean soap”

Wastewaters contain substantial amounts of long-chain fatty acids (LCFA) which, when in the form of sodium salts, are what we normally call soaps. These compounds, resulting from fats' hydrolysis, can be converted to high amounts of methane. Developing new technological solutions for LCFA methanation, but also understanding the physiology and microbiology of LCFA degradation is fundamental for the bioenergy val...

The influence of sulfate on methanogenic LCFA-degrading microbial communities

The microbiology of conversion of long-chain fatty acids (LCFA) to biogas

Wastewaters, mainly the ones from food processing industries, contain considerable amounts of long-chain fatty acids (LCFA). These pollutant compounds, resulting from the hydrolysis of lipids, can be used as energetic resources for the production of biogas. A large amount of methane can be produced from LCFA; theoretically 1g of oleate, one of the most common LCFA found in wastewaters, can be converted to 1.01 ...

Anaerobic microbial LCFA degradation in bioreactors

This paper reviews recent results obtained on long-chain fatty acids (LCFA) anaerobic degradation. Two LCFA were used as model substrates: oleate, a mono-unsaturated LCFA, and palmitate, a saturated LCFA, both abundant in LCFA-rich wastewaters. 16S rRNA gene analysis of sludge samples submitted to continuous oleate- and palmitate-feeding followed by batch degradation of the accumulated LCFA demonstrated that ba...

Syntrophomonas zehnderi sp. nov., an anaerobe that degrades long-chain fatty ac...

An anaerobic, mesophilic, syntrophic fatty-acid-oxidizing bacterium, designated strain OL-4T, was isolated as a co-culture with Methanobacterium formicicum DSM 1535NT from an anaerobic expanded granular sludge bed reactor used to treat an oleate-based effluent. Strain OL-4T degraded oleate, a mono-unsaturated fatty acid, and straight-chain fatty acids C4 : 0–C18 : 0 in syntrophic association with Methanobacteri...

Microbial communities involved in anaerobic degradation of unsaturated or satur...

Anaerobic long-chain fatty acid (LCFA)-degrading bacteria were identified by combining selective enrichment studies with molecular approaches. Two distinct enrichment cultures growing on unsaturated and saturated LCFAs were obtained by successive transfers in medium containing oleate and palmitate, respectively, as the sole carbon and energy sources. Changes in the microbial composition during enrichment were a...