Two-phase model of hydrolysis kinetics and its applications to anaerobic degradation of particulate organic matter

1997 ◽  
Vol 63-65 (1) ◽  
pp. 45-57 ◽  
Author(s):  
Vasily A. Vavilin ◽  
Sergei V. Rytov ◽  
Ljudmila Ya. Lokshina
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Anaerobic Degradation ◽  
Phase Model ◽  
Hydrolysis Kinetics ◽  
Two Phase

Anaerobic degradation kinetics of particulate organic matter: a new approach

1997 ◽  
Vol 36 (6-7) ◽  
pp. 239-246 ◽  
Author(s):  
Andrea Valentini ◽  
Gilbert Garuti ◽  
Alberto Rozzi ◽  
Andrea Tilche
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Anaerobic Degradation ◽  
Degradation Kinetics ◽  
Kinetic Constant ◽  
Power Coefficient ◽  
Mathematical Representation ◽  
First Order ◽  
Batch Tests ◽  
Kinetics Of

The development of a reliable model of anaerobic hydrolysis is of primary importance for improving modeling and design of anaerobic treatment for wastewaters and slurries with high suspended solids concentration. Michaelis-Menten, substrate first order, substrate and biomass first order and substrate first order and biomass half order equations have been compared using experimental data from a series of anaerobic degradation batch tests on cellulose particles of known size. A general kinetic equation [dS/dt=−KHASXA] which may include all the four considered kinetics, is presented. This general equation allows for a more accurate mathematical representation of the hydrolysis process. Analysing data from a series of batch tests, the best fit value of A was found to be in the range 0.42 to 0.64. This approach could reduce the choice of anaerobic degradation kinetics of particulate organic matter to the calculation of the kinetic constant KHA and of the related power coefficient A.

Increase of anaerobic degradation of particulate organic matter in full-scale biogas plants by mechanical maceration

2000 ◽  
Vol 41 (3) ◽  
pp. 145-153 ◽  
Author(s):  
H. Hartmann ◽  
I. Angelidaki ◽  
B.K. Ahring
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Anaerobic Degradation ◽  
Separation Unit ◽  
Fiber Separation ◽  
Operational Costs ◽  
Mechanical Pretreatment ◽  
Fiber Size ◽  
Before And After ◽  
Biogas Plants

Different concepts of implementation of mechanical pretreatment for enhancing the biogas potential from fibers in manure feedstock were valuated by sampling before and after macerators at different biogas plants and from a fiber separation unit. An increase of the biogas potential of up to 25% by pretreatment of the whole feed in the macerator before the reactor was observed. Implementation concepts with a treatment of the fibers alone after separation from the manure showed to be not efficient due to a low recovery of organic matter in the fibers by the separation unit. The low operational costs of a macerator make it attractive to use this pretreatment method for a more complete degradation of particulate organic matter. Investigation of the size distribution of the fibers showed that a change in biogas potential was not correlated to a smaller size of the fibers. Results from the macerators indicate that the biodegradability of the fibers is rather enhanced by shearing which is not necessarily reflected by a change in fiber size.

Two-phase model for human classical conditioning.

1968 ◽  
Vol 78 (3, Pt.1) ◽  
pp. 359-368 ◽  
Author(s):  
William F. Prokasy ◽  
Martha A. Harsanyi
Keyword(s):  
Classical Conditioning ◽  
Phase Model ◽  
Two Phase

Relating particulate organic matter-nitrogen (POM-N) and non-POM-N with pulse crop residues, residue management and cereal N uptake

Agronomie ◽  
2002 ◽  
Vol 22 (7-8) ◽  
pp. 777-787 ◽  
Author(s):  
Graeme D. Schwenke ◽  
Warwick L. Felton ◽  
David F. Herridge ◽  
Dil F. Khan ◽  
Mark B. Peoples
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Crop Residues ◽  
N Uptake ◽  
Residue Management ◽  
Pulse Crop

Macrophyte-derived detritus in shallow coastal waters contributes to suspended particulate organic matter and increases growth rates of Mytilus edulis

2020 ◽  
Vol 644 ◽  
pp. 91-103
Author(s):  
D Bearham ◽  
MA Vanderklift ◽  
RA Downie ◽  
DP Thomson ◽  
LA Clementson
Keyword(s):  
Organic Matter ◽  
Mytilus Edulis ◽  
Particulate Organic Matter ◽  
Coastal Waters ◽  
Gill Tissue ◽  
Suspension Feeder ◽  
Food Sources ◽  
Suspension Feeders ◽  
Blue Mussels ◽  
Suspended Particulate

Benthic suspension feeders, such as bivalves, potentially have several different food sources, including plankton and resuspended detritus of benthic origin. We hypothesised that suspension feeders are likely to feed on detritus if it is present. This inference would be further strengthened if there was a correlation between δ13C of suspension feeder tissue and δ13C of particulate organic matter (POM). Since detritus is characterised by high particulate organic matter (POC):chl a ratios, we would also predict a positive correlation between POM δ13C and POC:chl a. We hypothesised that increasing depth and greater distance from shore would produce a greater nutritional reliance by experimentally transplanted blue mussels Mytilus edulis on plankton rather than macrophyte-derived detritus. After deployments of 3 mo duration in 2 different years at depths from 3 to 40 m, M. edulis sizes were positively correlated with POM concentrations. POC:chl a ratios and δ13C of POM and M. edulis gill tissue decreased with increasing depth (and greater distance from shore). δ13C of POM was correlated with δ13C of M. edulis. Our results suggest that detritus comprised a large proportion of POM at shallow depths (<15 m), that M. edulis ingested and assimilated carbon in proportion to its availability in POM, and that growth of M. edulis was higher where detritus was present and POM concentrations were higher.

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