Ammonia toxicity in pure cultures of methanogenic bacteria

Sprott, G. Dennis; Patel, G. B.

doi:10.1016/s0723-2020(86)80034-0

Cited by 242 publications

(137 citation statements)

References 14 publications

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“…In addition, ammonia and volatile fatty acids are considered important factors for acetate metabolism. Aceticlastic methanogens are also known to be more sensitive to these compounds than hydrogenotrophic methanogens 32,67) . It has been reported that in several mesophilic biogas reactors, the recovery of 14 CO2 from [2-14 C] acetate was enhanced by increases of ammonium and potassium concentrations 63) .…”

Section: Ecology Of the Syntrophic Acetate-oxidizing Bacteriamentioning

confidence: 99%

Syntrophic Acetate-Oxidizing Microbes in Methanogenic Environments

2008

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Acetate is one of the most important intermediates for methanogenesis in the anaerobic mineralization of organic materials. Methanogenic acetate degradation is carried out by either an aceticlastic reaction or an anaerobic acetateoxidizing reaction. In contrast to the former reaction, the latter is energetically extremely unfavorable. However, the oxidation of acetate can occur with syntrophic interaction between certain bacteria and methanogenic archaea. The bacteria, namely syntrophic acetate-oxidizing bacteria, can oxidize acetate to produce hydrogen/CO2 only when their products are subsequently utilized by the hydrogen-scavenging methanogens. Surprisingly, some of these bacteria can also axenically grow on hydrogen/CO2 to produce acetate. This means that the bacteria can utilize both substrates and products reversibly. This review describes current studies of these curious and fascinating microbes.

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Section: Ecology Of the Syntrophic Acetate-oxidizing Bacteriamentioning

confidence: 99%

Syntrophic Acetate-Oxidizing Microbes in Methanogenic Environments

2008

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“…It is well known that a high ammonium concentration is toxic for anaerobes (Hendriksen and Ahring, 1991;Sprott and Patel, 1986;Truper and Pfenning, 1981). It is reported that methane production was inhibited 50% by ammonium at 3,000 mg/L (Gallert and Winter, 1997).…”

Section: Discussionmentioning

confidence: 99%

Simultaneous methanogenesis and phototrophic bacterial growth in relatively dry sewage sludge under light

Tada

Miah

Tsukahara

et al. 2005

J. Gen. Appl. Microbiol.

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Anaerobically digested sewage sludge with a variety of moisture content, namely 81%, 86%, 90% and 98%, were anaerobically cultured at 35°C under light. Phototrophic bacteria grew in the 86% moisture sludge (bacteriochlorophyll a, 0.46 g/L), 90% sludge (bacteriochlorophyll a, 0.36 g/L) and 98% sludge (bacteriochlorophyll a, 0.04 g/L) with methane production. Phototrophic bacteria could not grow in the 81% moisture sludge (bacteriochlorophyll a 0.004 g/L). Phototrophic bacteria could assimilate about 46% of the extracellular ammonium in the 90% moisture sludge. Phototrophic bacteria utilized organic compounds competing with methanogens; therefore, methane yield from the 90% moisture sludge under the light conditions was lower than that under the dark conditions. Phototrophic bacteria could grow in anaerobically digested sludge with relatively low moisture content, and assimilated extracellular ammonium in the sludge. The quality of digested sludge with phototrophic bacterial biomass for fertilizer could be improved compared with that without phototrophic bacterial biomass.

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“…Besides, the acclimatization of the seed sludge to the elevated concentrations of ammonium also has been reported to contribute to the success of methanogenesis performance (Hashimoto, 1986;Calli et al, 2005a). The adaptation of the methanogens to high concentrations of ammonium was confirmed by detecting resistant methanogens present in the seed sludge with a high concentration of ammonium (Sprott & Patel, 1986). During the adaptation to high ammonium concentrations, it was found that the acetate utilizing methanogens i.e.…”

Section: Influential Parameters On Biomethane Generation In Anaerobicmentioning

confidence: 96%