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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Upflow anaerobic solid-state (UASS) digestion of horse manure: Thermophilic vs. mesophilic performance
TL;DR: Thermophilic digestion of horse manure based on straw was investigated using the upflow anaerobic solid-state (UASS) process and showed a significantly higher efficiency and biochemical methane potential (BMP) tests showed that wheat straw obtained the highest BMP.
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Removal of helminth eggs and fecal coliforms by anaerobic thermophilic sludge digestion.
TL;DR: Anaerobic thermophilic digestion may be an appropriate option for sludge stabilization, in order to meet EPA Class A biosolids final disposal regulations, however, further research is needed inorder to consistently remove helminth eggs and fecal coliforms from waste sludge at shorter hydraulic retention times.
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Interaction In The Oral Proficiency Interview: Problems Of Validity
TL;DR: In this paper, a discourse analysis of 35 OPIs it more like an everyday, friendly conversation, an interview, or something else? The results of the discourse analysis were then compared with the prototypical features of the two speech events selected for the study (i.e., conversation and interview) to determine and describe the most typical discourse and linguistic features of OPIs.
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Kinetic comparisons of mesophilic and thermophilic aerobic biomass.
TL;DR: Kinetic parameters describing growth and decay of mesophilic and thermophilic aerobic biomass were determined in continuous and batch experiments by using oxygen uptake rate measurements and the observed biomass yields decreased under both temperature conditions as a function of the cell residence time.
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High-rate thermophilic bio-methanation of the fine sieved fraction from Dutch municipal raw sewage: Cost-effective potentials for on-site energy recovery
TL;DR: In this article, the BMP of fine sieved fraction (FSF) was studied under both mesophilic and thermophilic (55°C) conditions, whereas the stability of the fed-batch digesters at both 35°C and 55°C was researched by varying the inoculum to substrate ratios (RI/S: 0.5-15).
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.
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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.