Combined anaerobic digestion and biological nitrogen removal for piggery wastewater treatment: a modelling approach

Abstract

In order to deal with the environmental problems associated with animal production industrialization and at the same time considering energy costs increasing, a piggery wastewater treatment process consisting of combined anaerobic digestion and biological nitrogen removal by activated sludge was developed. This contribution presents a modelling framework in order to optimize this process. Modified versions of the well established ASM1 and ADM1 models have been used. The ADM1 was extended with biological denitrification. pH calculation and liquid gas-transfer were modified to take into account the effect of associated components. Finally, two interfaces (ADMtoASM and ASMtoADM) were built in order to combine both models. These interfaces set up the COD, nitrogen, alkalinity and charge fractionation between both models. However, for the mass balances between both models, some hypotheses were considered and might be evaluated.

Combined anaerobic and activated sludge anoxic/oxic treatment for piggery wastewater

“…This is basically due to the intensification of pig production in a very limited area (Rousseau et al, 2008). The swine wastewater is widely used as fertilizer in this region because of its high organic, nitrogen and phosphorus content.…”

Modelling Anaerobic Digestion Processes

“…Incorporation of nitrogen reduction poses similar problems as those of SRBs, as specific processes and kinetics would need to be included for each competing electron donor, adding largely to the amount of parameters to be determined. Some model attempts have been reported in line with this approach (Rousseau et al 2008;Tugtas et al 2006).…”

Anaerobic Processes

“…This approach to bio-hydrogen modeling was tested with an 11-L mesophilic reactor fed with 10, 20, 40, and 50 g/L of sucrose, and the investigators suggest good correlation is attainable, but no rigorous supporting statistical data is given. In another approach to modeling hydrogen production, a dynamic model was Anaerobic digestion was combined with biological nitrogen removal using activated sludge for piggery wastewater treatment using an integrated ADM1 and ASM1 model with two interfaces built to combine the models (Rousseau et al, 2008). The model development was described in detail as a tool for process optimization, however, the model was not tested.…”