Analysis of Biomethane Potential (BMP)
In our laboratory, we have six Anaero BMP systems that allow us to digest your samples and determine the biogas yield over the course of the BMP digestion which can last for 14, 21, 18, or 40 days. Our BMP analysis packages also determine the total solids (TS) and volatile solids (VS) contents of the sample and also involve periodic analyses of the composition of the biogas (for methane, carbon dioxide, hydrogen sulphide, oxygen, and ammonia) using the Biogas 5000 portable gas analyser.
We also have Deluxe versions of our BMP analysis packages that cover the important chemical and biological properties of the feedstock and digestate (the material remaining after the BMP test). Analytes that we determine in these Deluxe packages include: Total Solids, Volatile Solids , pH, Chemical Oxygen Demand (COD), Biological Oxygen Demand (BOD), Phosphorus, Potassium, Ammonia, Carbon, Hydrogen, Nitrogen and Sulphur.
Our BMP experiments are undertaken in triplicate and we report the values for each of the replicate, the mean, and the standard deviation between the replicates.
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Analysis Packages for Biomethane Potential (BMP)
Equipment Used for Biomethane Potential (BMP) Analysis
Biochemical Methane Potential (BMP) Unit
We use an automated device, developed by Anaero Technologies, to determine the biochemical methane potential of biomass.
Fruit juice processing generates large volumes of organic waste, including pomace, retentate, and waste apples, that are a challenge to manage. Anaerobic digestion (AD) allows for conversion of these wastes into biogas; however, their high acidity and low buffering capacity limits AD process stability, leading to reduced methane yield. In this study, co-digestion with manure and lignocellulosic biomass (LCB) was assessed. A five-factor mixture design was used to test different combinations on a bench scale, selected based-on seasonal fruit waste availability. Process performance was assessed based-on methane yield and volatile fatty acids before and after AD. Feedstock mixture representing an off-season blend of 20% pomace, 30% retentate and 50% manure, as well as an in-season blends of 20% waste apples, 30% pomace, 30% retentate, and 20% manure, were found to maximise the biomethane yield. Supplementation with at least 20% manure was essential for fruit waste digestion. Replacing a portion of the fruit waste with lignocellulose in the anaerobic digestion significantly improved the methane yield and prevented an “acid crash”. It was found that 30% LCB and 20% manure supplementation were the minimum required for anaerobic digestion process stability and yield for both in- and off-season fruit harvesting and processing. | ||