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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Journal ArticleDOI
Effect of Temperature on Microbial Community of a Glucose-Degrading Methanogenic Consortium under Hyperthermophilic Chemostat Cultivation
TL;DR: Results suggested that, at temperatures of 70 degrees C and above, methane production via the aceticlastic pathway was negligible and indirect methanogenesis from acetate was dominant, and a two stage fermentation process, acidogenic and methanogenic fermentation stages operated under different temperatures, should be more suitable for the thermophilic anaerobic treatment at temperatures above 65 degrees C.
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Biotreatment of Industrial Wastewaters under Transient-State Conditions: Process Stability with Fluctuations of Organic Load, Substrates, Toxicants, and Environmental Parameters
TL;DR: In this paper, the authors describe difficulties encountered in biological treatment of wastewater with highly variable influent characteristics and discuss typical design aspects of biological processes with respect to their success in treating highly fluctuating wastewaters.
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A comparison of mesophilic and thermophilic anaerobic upflow filters
TL;DR: In this paper, two anaerobic filters, one mesophilic and one thermophilic, were operated with a starch-based feed at a series of organic loading rates, and there was no difference in the performance of the two types of reactor, measured in terms of the removal of soluble COD (SCOD) and gas production.
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Thermophilic and mesophilic temperature phase anaerobic co-digestion (TPAcD) compared with single-stage co-digestion of sewage sludge and sugar beet pulp lixiviation
TL;DR: In this article, the performance of temperature phase anaerobic co-digestion (TPAcD) for sewage sludge and sugar beet pulp lixiviation (using the process of exchanging the digesting substrate between spatially separated thermophilic and mesophilic digesters) was tested.
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A Study of Two-Stage Anaerobic Digestion of Solid Potato Waste using Reactors under Mesophilic and Thermophilic Conditions
TL;DR: The results show the feasibility of using a two-stage system to treat solid potato waste under both mesophilic and thermophilic conditions, and there is a need to balance methane yield and complete digestion period when dealing with large quantities ofSolid potato waste.
References
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Book
Perry's Chemical Engineers' Handbook
TL;DR: In this paper, conversion factors and mathematical symbols are used to describe conversion factors in physical and chemical data and Mathematical Symbols are used for converting, converting, and utilising conversion factors.
Book
Chemical Engineering Kinetics
TL;DR: In this paper, chemical engineering kinetics was studied in terms of kinetics in the context of Chemical Engineering kinetics and its application in the field of chemical engineering. But they did not discuss the application of the kinetics of protein kinetics.
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Kinetics of anaerobic treatment: A critical review
TL;DR: The fundamentals of microbial kinetics and continuous culture models are presented and the effect of temperature and inhibitors on the intrinsic kinetic rates is discussed, and Stoichiometric and bioenergetic considerations are reviewed.
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Characterization of an acetate-decarboxylating, non-hydrogen-oxidizing methane bacterium.
TL;DR: A methanogenic bacterium, commonly seen in digested sludge and referred to as the “fat rod” or Methanobacterium soehngenii, has been enriched to a monoculture and is characterized.
Journal ArticleDOI
Anaerobic thermophilic digestion of manure at different ammonia loads: Effect of temperature
TL;DR: In this paper, the effect of temperature in the range of 40-64°C on thermophilic anaerobic digestion of cattle manure with two different ammonia concentrations (2.5 and 6.0 g-N/l) was investigated in continuouslyfed lab-scale reactors: the higher ammonia concentration reduced the maximum tolerable temperature.