Bacterial diversity in thermophilic aerobic sewage sludge

Sonnleitner, Bernhard; Fiechter, Armin

doi:10.1007/bf00508128

Cited by 23 publications

(11 citation statements)

References 4 publications

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“…Selection of new bacterial strains. In an attempt to increase the efficiency and stability of the treatment, 22 thermophilic bacterial strains originating from different sources were isolated after incubation of the samples for 2 weeks in swine waste with thermophilic treatment (Table 1) were gram-variable bacilli of different sizes. The presence of spores was observed for 17 strains; 12 were mobile; 21 could grow at 60°C, 9 could grow at 65°C, and none of the strains tested grew at 70°C.…”

Section: Resultsmentioning

confidence: 99%

“…Aerobic thermophilic treatment has been applied to sewage sludge and animal waste (12,13,22,23). Significant advantages of aerobic thermophilic digestion have been thought to include increased rates of oxidation, resulting in smaller digester volume requirements; destruction of most pathogenic bacteria, viruses, and parasites; weed seed destruction, and increased ease of liquid-solid separation (15).…”

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confidence: 99%

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Microbiological aspects of aerobic thermophilic treatment of swine waste

Beaudet

Gagnon

Bisaillon

et al. 1990

Appl Environ Microbiol

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A thermophilic strain (D2) identified as a Bacillus sp. was isolated from an aerobic digestor of swine waste after several months of operation at 55°C. Aerobic thermophilic batch treatment of swine waste inoculated with strain D2 was studied in a 4-liter fixed-bed reactor. Stabilization of the waste was achieved in less than 30 h when the original chemical oxygen demand (COD) was between 15 and 20 g/liter or in less than 48 h when the COD was around 35 g/liter. When the COD was higher than 30 g/liter, the pH of the waste reached 9.2 to 9.5 during the treatment, and periodic adjustment of the pH to 8.5 was necessary to maintain the activity of the biofilm. In this reactor, ammoniacal nitrogen was completely eliminated by desorption in less than 72 h of incubation. The different packing materials used resulted in similar rates of degradation of organic matter. The thermophilic treatment was also efficient in the 75-liter digestor, and stabilization was achieved in approximately 50 h. A bank of 22 thermophilic bacterial strains originating from different environments and adapted to the thermophilic treatment of swine waste was established. This thermophilic treatment allows, in one step, rapid stabilization of the waste, elimination of the bad smell, and complete elimination of ammonia nitrogen by stripping.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Microbiological aspects of aerobic thermophilic treatment of swine waste

Beaudet

Gagnon

Bisaillon

et al. 1990

Appl Environ Microbiol

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“…11 days, followed by slower reduction of COD (95%) over 11 COD 51-54 000 m da s. Final: pH 8. 3 Presence of phenol reduced bacterial numbers (total viable counts, COD 1600 mg/I TVC) but remaining organisms degraded it using phenol mono TOC 600em e and TVC rose a ain. Three distinct eflluents were produced by different stages in the manufacturing process.…”

Section: Stored Henolic Waste 50 Litre Trialmentioning

confidence: 99%

“…Air is exhausted through a pipe at the top. The random microflora, which develops in such digesters, responds with rapid growth and typically the temperature is elevated (to a maximum of 70e° C) by self heating (3,4,5]. The organic component of the feedstock is used for microbial growth but most is exhausted as CO 2 , some ammonia and water.…”

Section: Auto-thermal Aerobic Digestersmentioning

confidence: 99%

Treatment of high-strength liquid wastes by auto-thermal aerobic digestion

2019

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Auto-thermal aerobic digesters comprise a simple, robust, inexpensive technologyappropriate for on-site liquid waste treatment by small- and medium-sized enterprises.They have been shown to be effective at treating a wide range of effluents and liquorsarising from food processing and chemical plants, especially those with high levels ofbiological oxygen demand (BOD), or for small-scale sewage treatment.Liquid circulates around the reactor vessel by pumping through a venturi nozzle, whichdraws air into the flow. As the microbial community develops, the system self-heats andorganic matter is removed as CO2, NH3 and water. The temperature of the insulatedvessel may rise to 55e°C or more as the thermophilic community becomes established.BOD levels typically reduce by 90% over a 3-5 day residence time. Auto-thermal aerobicdigestion (ATAD) acts faster than mesophilic or anerobic degradation and is veryresistant to organic toxins (pentachlorophenol) or metal pollutants (Cu2+, Zn2+, Ni2J inthe waste.Examples are shown of wastes and liquors successfully treated by pilot-scale ATADsystems up to I 000 litres in size. These include effluents from food processing (icecream, chocolate, egg pasteurisation, brewing), chemical plants (wood processing,phenolic liquor) and silage pit effluent.Auto-thermal aerobic digestion offers a versatile, cost-effective solution for liquid wastetreatment in a climate of increasing demands from Regulatory Authorities and increasingcosts of conventional off-site waste disposal such as sewerage or landfill charges.

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“…Sonnleitner and Fiechter (1983a,b)studied the microbiology of sewage sludge undergoing TAD at 50–67°C and characterized at least 95% of the isolates as Bacillus spp. with maximal growth temperatures in excess of 70°C.…”

Section: Introductionmentioning

confidence: 99%

Diversity of thermophilic populations during thermophilic aerobic digestion of potato peel slurry

2007

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To study the diversity of thermophiles during thermophilic aerobic digestion (TAD) of agro-food waste slurries under conditions similar to full-scale processes. Population diversity and development in TAD were studied by standard microbiological techniques and the processes monitored by standard fermentation procedures. Facultative thermophiles were identified as Bacillus coagulans and B. licheniformis, while obligate thermophiles were identified as B. stearothermophilus. They developed rapidly to peaks of 107 to 108 in ≤48 h. Stability of obligate thermophiles increased with process temperatures. Thermophiles were unstable at process pH above or below neutral, but developed rapidly at all aeration rates. Peak populations were higher in the median than at extremes of aeration rates. Obligate thermophiles were unstable at low aeration rates. Process self-heating was higher at lower than at higher aeration rate. Beyond 96 h most thermophiles were present as spores. Limited range of indigenous thermophiles drives TAD of slurry. They develop rapidly and are stable at most digestion conditions. Development and stability of thermophiles in TAD suggest that the process may be operated in a wide range of conditions; and even at short HRT in continuous processes without compromising efficiency

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Bacterial diversity in thermophilic aerobic sewage sludge

Cited by 23 publications

References 4 publications

Microbiological aspects of aerobic thermophilic treatment of swine waste

Microbiological aspects of aerobic thermophilic treatment of swine waste

Treatment of high-strength liquid wastes by auto-thermal aerobic digestion

Diversity of thermophilic populations during thermophilic aerobic digestion of potato peel slurry

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