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 increase from 55 to 65°C on performance and microbial population dynamics of an anaerobic reactor treating cattle manure
TL;DR: Numbers of cultivable methanogens, estimated by the most probable number (MPN) method, were significantly lower on glucose, acetate and butyrate at the increased operational temperature, while the numbers of hydrogenotrophic methanogen remained unchanged.
Book ChapterDOI
Perspectives for anaerobic digestion.
TL;DR: This chapter aims at provide a basic understanding of the world in which anaerobic digestion is operating today and it will furthermore, reduce energy consumption or may even be net energy producing.
Journal ArticleDOI
Effect of organic loading rate on VFA production, organic matter removal and microbial activity of a two-stage thermophilic anaerobic membrane bioreactor.
TL;DR: Increased OLR increased organic removal efficiency up to second loading rate and dropped in third loading rate while biological activity was increased continuously, and the total VFA concentration was increased with increased OLR.
Journal ArticleDOI
Advanced anaerobic wastewater treatment in the near future
TL;DR: By integrating the anaerobic process with other biological methods (sulphate reduction, micro-aerophilic organisms) and with physical-chemical methods, a complete treatment of the wastewater can be accomplished at very low costs, while at the same time valuable components can be recovered for reuse.
Journal ArticleDOI
Development of anaerobic migrating blanket reactor (AMBR), a novel anaerobic treatment system
Largus T. Angenent,Shihwu Sung +1 more
TL;DR: The performance of the AMBR in treating a carbohydrate-rich wastewater was found to be superior in terms of maximum loading rate and SMPR, and the absence of pre-acidification created "bulking" problems in a UASB reactor, operated under conditions similar to that of theAMBR.
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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.