Journal ArticleDOI
Limitations of thermophilic anaerobic wastewater treatment and the consequences for process design.
Reads0
Chats0
TLDR
In this article, the process stability of thermophilic anaerobic wastewater treatment systems is investigated and a relatively low sensitivity to temperature changes if high-rate reactors with immobilized biomass are used.Abstract:
Thermophilic anaerobic digestion offers an attractive alternative for the treatment of medium- and high-strength wastewaters. However, literature reports reveal that thermophilic wastewater treatment systems are often more sensitive to environmental changes than the well-defined high-rate reactors at the mesophilic temperature range. Also, in many cases a poorer effluent quality is experienced while the carry over of suspended solids in the effluent is relatively high. In this paper recent achievements are discussed regarding the process stability of thermophilic anaerobic wastewater treatment systems. Laboratory experiments reveal a relatively low sensitivity to temperature changes if high-rate reactors with immobilized biomass are used. Other results show that if a staged process is applied, thermophilic reactors can be operated for prolonged periods of time under extreme loading conditions (80-100 kg chemical oxygen demand.m-3.day-1), while the concentrations of volatile fatty acids in the effluent remain at a low level.read more
Citations
More filters
Journal ArticleDOI
The roles of acetotrophic and hydrogenotrophic methanogens during anaerobic conversion of biomass to methane: a review
B. Demirel,Paul Scherer +1 more
TL;DR: The aim of this paper is primarily to review the recent literature about the occurrence of both acetotrophic and hydrogenotrophic methanogens during anaerobic conversion of particulate biomass to methane (not wastewater treatment), while this review does not cover the activity of the acetate oxidizing bacteria.
Journal ArticleDOI
Utilisation of biomass for the supply of energy carriers
P.A.M. Claassen,J.B. van Lier,A. M. Lopez Contreras,E.W.J. van Niel,L. Sijtsma,Alfons J. M. Stams,S. S. de Vries,Ruud A. Weusthuis +7 more
TL;DR: This mini-review of several fermentation processes is discussed, starting with the most advanced process of ethanol production, followed by methane production, an established process for waste water purification which is gaining more attention because of the inherent energy production.
Journal ArticleDOI
Mesophilic and thermophilic temperature co-phase anaerobic digestion compared with single-stage mesophilic- and thermophilic digestion of sewage sludge.
TL;DR: The higher performances on the volatile solid and pathogen reduction, and stable operation of the temperature co-phase anaerobic system might be attributable to the well-functioned thermophilic digester, sharing nutrients and intermediates for anaerilic microorganisms, and selection of higher substrate affinity an aerobic microorganisms in the co- phase system.
Journal ArticleDOI
Phylogenetic diversity of mesophilic and thermophilic granular sludges determined by 16s rRNA gene analysis
Yuji Sekiguchi,Yoichi Kamagata,Kazuaki Syutsubo,Akiyoshi Ohashi,Hideki Harada,Kazunori Nakamura +5 more
TL;DR: The microbial diversity of two types of methanogenic granular sludge, mesophilic and thermophilic, which had been treating sucrose/propionate/acetate-based artificial wastewater were compared, suggesting that the microbial Diversity of the thermophobic granule was lower than that of the Mesophilic granule.
Journal ArticleDOI
Cultivation of uncultured chloroflexi subphyla: significance and ecophysiology of formerly uncultured chloroflexi 'subphylum i' with natural and biotechnological relevance.
Takeshi Yamada,Yuji Sekiguchi +1 more
TL;DR: Recent findings on the ecological significance and possible ecophysiological roles of 'Chloroflexi subphylum I' are discussed based on findings from both the characteristics of the cultured Chlor oflexi and molecular-based analyses.
References
More filters
Journal ArticleDOI
Extracellular Polymers in Granular Sludge from Different Upflow Anaerobic Sludge Blanket (UASB) Reactors
TL;DR: Changing the feed of an upflow anaerobic sludge blanket reactor from a sugar-containing waste-water to a synthetic waste- water containing acetate, propionate and butyrate resulted in a decrease in the protein and polysaccharide content and an increase in the lipid content of the extracellular material.
Journal ArticleDOI
Thermophilic methane production from cattle waste.
TL;DR: It is indicated that loading rates can be much higher than those previously thought useful for maximizing methanogenesis from cattle waste, and methane production from waste of cattle fed a finishing diet was investigated, using four 3-liter-working volume anaerobic digestors.
Journal ArticleDOI
Characterization and nutritional properties of Methanothrix concilii sp. nov., a mesophilic, aceticlastic methanogen
TL;DR: A nonmotile, rod-shaped, nonspore-forming, mesophilic methanogenic bacterium was isolated from sewage sludge and in the presence of CO2 was able to grow and produce significant amounts of methane from acetic acid.
Journal ArticleDOI
Effects of hydrogen and formate on the degradation of propionate and butyrate in thermophilic granules from an upflow anaerobic sludge blanket reactor.
TL;DR: No significant differences in the stimulation of the degradation rates were observed when the disintegrated granules were supplied with methanogens that utilized hydrogen only or hydrogen and formate, indicating that interspecies formate transfer was not important for stimulation of propionate and butyrate degradation.
Journal ArticleDOI
The influence of the total ammonia concentration on the thermophilic digestion of cow manure
TL;DR: In this article, the authors showed that the total ammonia concentration, and not the volatile solids concentration of the manure, is responsible for the poor performance of the thermophilic process.