Parameter analysis of the IWA Anaerobic Digestion Model No. 1 for the anaerobic digestion of blackwater with kitchen refuse

Abstract

The IWA anaerobic digestion model No.1 (ADM1) had been successfully applied to the lab-scale mesophilic blackwater anaerobic digestion (BWAD) plant for cases of only blackwater (BW) feeding and of BW plus kitchen refuse (KR) feeding. In this paper, the simulation results of BW + KR anaerobic digestion are presented and discussed, followed by the analyses and discussion of the critical and important parameters as well as the performance of ADM1 based on these results. The raw BW can contain up to 30% short chain fatty acids (SCFA) which severely impact the performance of the model. The model proved that the disintegration/hydrolysis rate of BW is around 4.5 d(-1), which is about ten times higher than that of KR (Kdis,KR = 0.5 d(-1)). ADM1 is not sensitive to the distribution ratio among carbohydrates, proteins and lipids. For BWAD the C4 metabolism can be integrated in the uptake of LCFA. The uptake delay phenomenon was observed and cannot be simulated by ADM1, but it is tolerable. No unique KI,NH3,ac is found out for all investigated ammonia concentration ranges. Meanwhile, ADM1 is not sensitive to KLa and kp1 so they can easily be set up.

Biomethanization of Brewer's spent grain evaluated by application of the Anaerobic Digestion Model No.1

“…The hydrolysis rate constant evaluated in this study varied from 0.124 d − 1 for lipids to 1.056 d − 1 for proteins, in agreement with the statement of Feng et al . and with other values reported in literature for mesophilic anaerobic digestion of complex substrates .…”

“…As an example, Feng et al . found the very high value (10 times higher than those recommended in ADM1) of 4.5 d − 1 for k dis when applied the ADM1 to the anaerobic digestion of blackwater, that is a liquid phase substrate.…”

“…The calibrated disintegration rate constant resulted equal to 0.823 d − 1 , a value higher than those suggested by ADM1 (0.5 d − 1 ). It is worth to note that a wide range of values of k dis exists in literature depending on the solid content of the treated biowaste. As an example, Feng et al .…”

“…Feng et al . stated that this high value can be used in certain situations to completely exclude the influence of the hydrolysis step in the model. Actually, in most cases, carbohydrates, proteins and lipids have different hydrolysis rates that fall into the range 0.01–1.0 d − 1 .…”

Kinetic Considerations on Thermophilic Digestion of Maize Silage at Different Feeding Modes

“…Chen & Hashimoto, 1980;Kiely et al, 1997;Kalfas et al, 2006;Sosnowski et al, 2007;Boubaker & ridha, 2008;Liu et al, 2008;Vavilin et al, 2008;Qu et al, 2009) or waste water treatment (e.g. Batstone et al, 2002;Feng et al, 2006;Tomei et al, 2008;Boubaker & ridha, 2008), not so many results can be found on modeling of agricultural biogas production (Hill & Barth, 1977;Simeonov et al, 1996;Angelidaki et al, 1999) and only a few consider the digestion of energy crops (Wichern et al, 2008(Wichern et al, & 2009Beierlein et al, 2010). The developed models, in particular the most complex ADM1, show high complexity and include a great number of parameters, which improve the accuracy of the model on one hand, but create implementation difficulties on the other hand as in many cases all data required by such models cannot be collected.…”