Modeling the Two-Stage Anaerobic Digestion of Domestic Wastewater With the Development of a Monitoring Application

Abstract

-The IWA Anaerobic Digestion Model No. 1 (ADM1) was chosen to simulate a two-stage anaerobic digestion lab-scale plant treating domestic wastewater. Initially, the model was preliminary tested using synthetic wastewater. The simulation results were satisfactorily compared to NH 4 + and chemical oxygen demand (COD) data for the first and second stages, respectively. A transformation method was then applied to estimate from the domestic wastewater composition the input variables to the ADM1. After proper calibration and further validation, the model was able to successfully predict the COD degradation from a varying influent, showing its practical applicability. Finally, a standalone application based on the validated model was developed to be used for monitoring purposes at the treatment plant. The developed application is suitable for direct implementation at a full-scale plant without the need of additional software or specialized assistance.

Phase Separation in Anaerobic Digestion: A Potential for Easier Process Combination?

“…According to the model, all steps of AD took place in both reactors except for the hydrolysis: about 40% of the acidogenesis and nearly 75% of the methanogenesis occurred in the second stage. Vega De Lille et al (2016) were able to predict the COD course from domestic wastewater in a two-stage AD system, consisting of a sequencing batch reactor and a fixed bed reactor. The authors used an adjusted ADM1, which showed good results for the degradation of varying feedstock.…”

The structured modeling framework of anaerobic digestion in Modelica: development of ADMLib package

“…11 The ADM1 has been used to simulate single and two-stage digestion conditions for many distinct substrates. [12][13][14][15][16] This versatility makes the model suitable for analyzing several systems and for developing new reduced models for specific applications.…”