A typical characterization of a real OFMSW can be observe in Table 1. The co-digestion of biological sludge and OFMSW has been considered by some authors without existing an agreement according to the optimum mixture, then a large range of ratios have
been considered in this study using weight percentages to get the desired mixtures. The concentration of each co-digestion has not being modified in order to study the problems derived of the TS concentration.Table 2 shows the four different co-digestion mixtures that were considered in this work. A full characterization of the substrates, co-digested mixtures and the inoculum used for the experiments are presented in Table 3 and Table 4. The characterization of the co-digestion mixtures was obtained from the theoretic mixture of the sole substrates OFMSW and biological sludge. The main characterization
of the inoculum and the co-substrates was accomplished following an internal method of the Anti-infection Compound Library chemical structure University of Valladolid (UVa) based on standard methods [3]. Total and volatile solids (TS, VS) and total chemical oxygen demand (CODt) were determined. To calculate the theoretical potential using several methodologies, an extended characterization learn more is necessary performed by external laboratories. Gravimetric techniques were used to determine grease content [15] and [12] and gross fiber (Weende Method), volumetric procedures [12] for carbohydrate content, and elemental analyses [31] for protein content and elemental composition. The BMP assays were performed following an internal method from the UVa based on standardized assays
for research purposes [1]. The substrate and the inoculum were placed in a glass bottle of 2 L capacity at mesophilic conditions following a substrate/inoculum ratio of 1/1 in terms of VS. Micronutrients and macronutrients were added in order to ensure the activity of the inoculum [17]. Mesophilic inoculum coming from a reactor fed with mixed sludge was used for all the assays and finally the bottles were closed and placed in a rotational stirrer which mixed the substrate and inoculum perfectly. Triplicates were carried out for these experiments including a blank, which indicated the BCKDHA productivity of the inoculum, in order to obtain the production of the sole substrate, and a control with cellulose to verify the activity of the inoculum. Periodical monitoring analyses of biogas production and composition were performed during the assays using a pressure meter and gas chromatography. The BMP were finished when a dairy production of less than 1% of the whole production occurred as it is indicated in Eq. (1) where “n” represents the day of the experiment. equation(1) Production%=((Gross prod(ml)n−(Gross prod(ml)n−1)Gross prod(ml)n)×100 The results provided by the BMP assays were obtained from the triplicate average for each bottle and were expressed as the net volume of methane per g of VS added (mlCH4/gVSadded).
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