Application of Contois, Tessier, and first-order kinetics for modeling and simulation of a composting decomposition process

New insights into the kinetics of bacterial growth and decay in pig manure–wheat straw aerobic composting based on an optimized PMA–qPCR method

“…The average values of μ ( T ) in the above studies were 0.07, 0.29, 0.02 and 0.05 h −1 . The value obtained for μ in the present study based on the quantification results of X viable and X decay is μ = 0.0317 ± 0.0033 h −1 , which approximates the values in the early research using similar composting materials, such as chicken manure–rice bran–sawdust (Seki, ) and pig manure–wheat straw (Wang and Witarsa, ). As for k d , the range of k d in the previous studies, as shown in Table , was (0.01–0.25) times the value of μ , while some past research assumed k d = 0.05 μ (Angelidaki et al ., ; Oudart et al ., ).…”

“…For this reason, researchers relied upon assumption and empirical regression to calculate estimates of these two parameters. For example, some research assigned μ and k d by assumption for the composting processes of corncobs, cattle manure–municipal sewage sludge and swine–straw (Stombaugh and Nokes, ; Sole‐Mauri et al ., ; Wang and Witarsa, ), while others inferred the variation of X viable and the values of μ and k d based on the regression relationship between bacterial growth and the composting temperature and degradation of organic matter (Mason, ; Yamada and Kawase, ; Vasiliadou et al ., ; Ge et al ., ,). Not only are μ and k d the key parameters in interpreting the mechanisms of bacterial growth and decay, but the values also affect the accuracy of numerical simulation of composting processes (Sole‐Mauri et al ., ; Zhang et al ., ; Ge et al ., ; Vasiliadou et al ., ).…”

Coupled Flow Modelling for a Geothermally Facilitated Bioreactor

“…Additionally, accumulation of organic acid if the sulfate reduction is too slow can have an inhibitory effect on the process. A recent study by Wang and Witarsa (2016) suggested that disintegration of raw compost was the rate limiting step, which departs from a common assumption that the fermentation of dissolved cellulosic and hemi-cellulosic material is the rate-limiting step of anaerobic lignocellulosic biomass digestion.…”

Kinetic study and modeling of xylitol production using Candida tropicalis in different culture media using unstructured models

“…Monod kinetics, expressed as substrate degradation resulting from microbial uptake and cell concentration, has a great effect on degradation rates. Contois kinetics considers the fact that a high concentration of cells adhered to the surface of the particles could inhibit Tessier kinetics takes into account the maintenance energy for cellular activity, which means that the maximum growth rate will be reduced when the substrate concentration is lower and microorganisms compete for food sources (Wang and Witarsa, 2016). It is necessary to highlight that the experimental value of μ max in the synthetic medium was similar to that reported by the Tessier model, whereas it was closer to the Contois equation in non-detoxified OPEFB hydrolysate (Table 1).…”

“…In order to determine if this could be happening in this study, the amount of substrate used for biomass in the non-growth phase and the maintenance coefficient (ms) for C. tropicalis in synthetic medium and in nondetoxified OPEFB hydrolysate were determined (Table 1). The ms indicates the portion of substrate consumed for the maintenance of cellular function and is used as a correction for the microbial growth kinetics (Wang and Witarsa, 2016). In synthetic media, the estimated values of the ms showed that in the Tessier model more xylose was used for its non-growing components, which contributed to xylitol formation; while in the non-detoxified OPEFB hydrolysate, the Monod model showed greater use of xylose for its non-growing components.…”