Co-digestion of multiple su...

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Testing Co-digestion of multiple substrates may lead to a more stable AD process

Testing Co-digestion of multiple substrates may lead to a more stable AD process

Mixing two or more different types of substrates together may improve nutrient balance and lead to a more stable AD process. This is favourable for maximising the gas production and resource utilisation and represents an integral part in the optimisation of a biogas plant. However, not all substrate mixtures have positive effect on the process. The AMPTS II is an excellent batch fermentation test platform for fast evaluation of co-digestion strategy with minimal labour demand.

EXAMPLE 1: Screening of single or multiple substrate combinations

AMPTS II may be used to simultaneously screen combinations of co-substrates to find the substrate mixture than lead to the highest gas production and fastest degradation (Cabbai et al., 2013; Sahito et al., 2013; Kuusik et al., 2013). For example, anaerobic co-digestion of sewage sludge with food waste or co-digestion of animal manure with energy crops may be one of the most viable solutions to optimise the digesters stability & efficiency in wastewater treatment or biogas plants.

Specific methane production of sewage sludge (SwS), OFMSW and two co-digestion mixtures (CO-DIG 1, CO-DIG 2) (Cabbai et al., 2013).

EXAMPLE 2: Optimisation of substrate mix for co-digestion

Besides the selection of co-substrates it is important to determine how the co-substrates should be mixed to maximise the gas production and resource utilisation. AMPTS II is an excellent tool in this regard as it allows for parallel evaluation of different co-substrate ratios and concentrations (Koch et al., 2015; Wall et al., 2013; Nartker et al., 2014).
Methane yields VS volatile solids VS content food waste sewage sludge mixture Bioprocess Control

Ultimate methane yields vs. volatile solids (VS) content of food waste in sewage sludge mixture (Koch et al., 2015).

EXAMPLE 3: Investigation of microbial communities change in codigestion

In order to improve the overall co-digestion process AMPTS II could also be used for optimising the microbial community structure. An example is the evaluation of the hydrolysis/acidification reaction in a two-phase system that can separate the two groups of microbial communities (Rajagopal et al. 2014). Another example is the investigation of how the methane potential and methanogenic communities change in a codigestion process at different temperatures (i.e. mesophilic (37 °C) and thermophilic (55 °C) conditions) (Walter et al., 2015).>

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AMPTS II - methane potential analysis tool

The AMPTS II is an efficient analytical instrument for conducting real-time BMP, anaerobic biodegradability and SMA assays, having sampling, analysis, recording and report generation fully integrated and automated. An evolution in methane potential analysis.
AMPTSII methane potential analysis tool The AMPTS II is a well engineered analytical device developed for on-line measurements of ultra low biomethane and biogas flows produced from the anaerobic digestion of any biological degradable substrate at laboratory scale.


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