Journal ArticleDOI
Limitations of thermophilic anaerobic wastewater treatment and the consequences for process design.
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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
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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
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Journal ArticleDOI
Acclimatization of anaerobic sludge for UASB-reactor start-up
TL;DR: Indications were obtained that the use of differenttypes of digested sewage sludge leads to the development of different types of granular sludge, as a result of differences in the average biomass retention time during the early stages of start-up.
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Start-up of a thermophilic upflow anaerobic sludge bed (UASB) reactor with mesophilic granular sludge
TL;DR: The temperature optima for acetotrophic methanogenic activity of the sludges cultivated at 46, 55 and 64° C, were similar, but differed significantly from the temperature optimum of the mesophilic inoculum.
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Separation of the propionate degradation to improve the efficiency of thermophilic anaerobic treatment of acidified wastewaters.
TL;DR: In this paper, a two-stage process is developed, in which the propionate degradation is spatially separated from other conversions in which hydrogen is involved, and significantly better results were obtained with the two stage system as compared with a one-stage system with an equal total volume.
Journal ArticleDOI
Thermophilic anaerobic digestion of high strength wastewaters.
TL;DR: Investigations on the thermophilic anaerobic treatment of high‐strength wastewaters (14‐65 kg COD/m3) are presented, indicating that the toxicity of the vinasse is more important than the loading rate in determining the efficiency of the conversion of v inasse to methane.
Journal ArticleDOI
Heterogeneous Distribution of Microbial Activity in Methanogenic Aggregates: pH and Glucose Microprofiles
Piet Lens,Dirk de Beer,C. C. H. Cronenberg,Frans P. Houwen,S.P.P. Ottengraf,Willy Verstraete +5 more
TL;DR: Methanogenic aggregates, harvested from an upflow anaerobic sludge blanket reactor treating potato starch wastewater, were acclimatized to either glucose or a mixture of sugars and organic nitrogen compounds, suggesting strong metabolism by the acidogenic bacteria.