Thermophilic aeration of cattle slurry with whey and/or jam wastes

Review of the use of aerobic thermophilic bioprocesses for the treatment of swine waste

“…The experimental confirmation had already been done in Germany in the 1960s but results were presented in English only in the early 1970s (Pö pel and Ohnmacht, 1972). Since then, self-heating up to the thermophilic range has been shown for different organic wastes, including liquid manure, even in cold climates (Terwilleger and Crauer, 1975;Pilon, 1984;Hojovec, 1990;Martens et al, 1998;Skjelhaugen, 1999;Oechsner and Doll, 2000;Burton and Turner, 2003;Juteau et al, 2004;Heinonen-Tanski et al, 2005). A minimal quantity of organic material is needed to sustain self-heating, but an absolute value is difficult to establish.…”

“…Bioreactors for this application are sized to accommodate a 0.5-to 1.0-m depth foam layer and mechanical foam cutters seem to be efficient to control it. However critical problems with foam have often been reported for AT processes treating liquid manure (Pilon, 1984;Skjelhaugen, 1999;Heinonen-Tanski et al, 2005). It is generally presented as a detail but people who have worked with this technology know that the intense foaming represents a serious obstacle to its implementation.…”

Methods to reduce pathogen microorganisms in manure

“…Then, the microbial reductions can be very high and enteric microbial numbers are reduced to less than the detection limits (Evans et al, 1982;Heinonen-Tanski et al, 2005b). If the detection limits (typically 10 or 1 CFU/g or PFU/g plaque forming units for viruses) for indicators are reached, the present/absent analyses for enteric pathogen microorganisms would give negative results and product would no more cause microbiological risks.…”

13C-NMR Assessment of the Pattern of Organic Matter Transformation during Domestic Wastewater Treatment by Autothermal Aerobic Digestion (ATAD)

“…Autothermal Thermophilic Aerobic Digestion (ATAD) has increasingly been used worldwide for tertiary treatment of animal manure, domestic wastewater and for food, pulp and textile wastes [1–4]. The thermophilic conditions that occur during the ATAD process facilitate microbial biomass production [1,5–7] and degradation of multiple substrates in the sludge [3,4].…”

“…The thermophilic conditions that occur during the ATAD process facilitate microbial biomass production [1,5–7] and degradation of multiple substrates in the sludge [3,4]. The elevated temperature also facilitates improved degradative kinetics which in turn is complemented by efficient mixing and aeration during the process [6].…”