Extension of Anaerobic Digestion Model No. 1 with Processes of Sulfate Reduction

Abstract

In the present work, the Anaerobic Digestion Model No. 1 (ADM1) for computer simulation of anaerobic processes was extended to the processes of sulfate reduction. The upgrade maintained the structure of ADM1 and included additional blocks describing sulfate-reducing processes (multiple reaction stoichiometry, microbial growth kinetics, conventional material balances for ideally mixed reactor, liquid-gas interactions, and liquid-phase equilibrium chemistry). The extended model was applied to describe a longterm experiment on sulfate reduction in a volatile fatty acid-fed upflow anaerobic sludge bed reactor and was generally able to predict the outcome of competition among acetogenic bacteria, methanogenic archaea, and sulfate- reducing bacteria for these substrates. The computer simulations also showed that when the upward liquid velocity in the reactor exceeds 1 m/d, the structure of the sludge becomes essential owing to bacterial detachment.

Fate of Trace Metals in Anaerobic Digestion

“…The aim of the ADM1 approach is not to provide an overall model but to supply a unified basis for AD modelling; indeed the first version of ADM1 neglects certain processes involved in AD, such as sulfate reduction, acetate oxidation, homoacetogenesis, solids precipitation and inhibition due to sulfide, nitrate, longchain fatty acids (LCFAs), and weak acids and bases [102]. Some of the neglected aspects have since been studied and modelled; for instance, two ADM1 extensions were published in 2003 concerning, respectively, sulfate reduction [103] and CaCO 3 precipitation [104]. A further extension to remove the ADM1 discrepancies in both carbon and nitrogen balances was later published [105].…”

Mathematical modeling of simultaneous carbon-nitrogen-sulfur removal from industrial wastewater

“…1 (ADM1) [24]. Furthermore, Fedorovich et al [55] thoroughly discussed the extension of ADM1 with process of sulfate reduction. Therefore, the work presented here 5 attempts to model the integrated C-N-S removal process by incorporating ASMs and extended ADM1 with sulfate reduction, and some extensions including oxygen/nitrate-driven sulfide oxidation processes are also considered.…”

The Research of Corrected First Order Kinetics on Hydrolysis and Biogas Generation in Batch Anaerobic Digestion

“…Following the presence of model, some researches on complement and correction for it have been carried out successively [11][12]. Valentini and Borja et al argued that Monod equation is suitable for describing the hydrolysis of soluble organics but not for insoluble organics [13,14], and Contois model could not explain the effect of temperature on hydrolysis rate [15][16][17].…”