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.
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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
Microbial acetate conversion to methane: kinetics, yields and pathways in a two-step digestion process
TL;DR: It was shown by labelling experiments using (U-14C) acetate that as much as 65%–96% of the total methane produced came from the acetate, which is an important intermediate of the anaerobic degradation process, which results in the generation of methane.
Journal Article
High rates conversions of soluble organics with a thermophilic anaerobic attached film expanded bed
G. Schraa,W.J. Jewell +1 more
TL;DR: The anaerobic attached-film expanded bed (AAFEB) process was developed by Jewell et al. as discussed by the authors, which accumulates large quantities of microbial biomass (30 to 40 kg/m3 volatile solids), which in turn enables it to efficiently convert dilute sub strates (such as wastewater) to biogas, with minimum sludge yields.
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Methanogenesis from acetate: Physiology of a thermophilic, acetate-utilizing methanogenic bacterium
TL;DR: A thermophilic acetate-decarboxylating methanogenic bacterium grown with acetate as sole energy and carbon source had a optimal pH range of 7.3–7.5 and a temperature optimum near 60°C; no growth occurred above 75°C.
Journal ArticleDOI
A study of the operation of mesophilic and thermophilic anaerobic filters treating a synthetic coffee waste
N. Fernandez,C.F. Forster +1 more
TL;DR: In this article, two anaerobic filters, operated at 37°C and 55°C with a synthetic wastewater made from a coffee-bean extract, were used to study the operation of mesophilic and thermophilic digesters.
Journal ArticleDOI
Another look at thermophilic anaerobic digestion of wastewater sludge
TL;DR: In this paper, the most flexible land use practices are allowed for biosolids with low pathogen content (Class A) and for high-temperature sludge treatment processes (geater than 53°C), indicator organism destruction can be used as a measure of pathogen destruction.