Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (C.S.I.C.), Avenida Padre García Tejero, 4, 41012 Sevilla, Spain; Departamento de Sistemas Físicos y Naturales, Universidad Pablo de Olavide, Ctra. de Utrera, km 1, 41013 Sevilla, Spain.
Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (C.S.I.C.), Avenida Padre García Tejero, 4, 41012 Sevilla, Spain.
Bioresour Technol. 2014 Apr;157:263-9. doi: 10.1016/j.biortech.2014.01.096. Epub 2014 Feb 4.
Olive mill solid waste (OMSW) is a pollutant waste coming from olive oil elaboration by the two-phase centrifugation system. OMSW has a high organic matter content and unbalanced carbon to nitrogen (C/N) ratio, 31/1, which avoids obtaining high methane yields in the anaerobic digestion of this waste. In the present study a microalgae, Dunaliella salina, was employed as co-substrate for the OMSW anaerobic digestion in order to decrease the C/N ratio and increase its biodegradability. Different co-digestion mixtures (C/N ratios) were studied. The increase of D. salina from 25% to 50% in the co-digestion mixture clearly increased the biodegradability of the sole substrates. The highest biodegradability was found for the co-digestion mixture 50% OMSW-50% D. salina. Nevertheless, the maximum methane production, 330mLCH4/gVSadded, and the highest methane production rate were obtained for the co-digestion mixture 75% OMSW-25% D. salina, keeping a C/N ratio near to 26.7/1.
橄榄渣固体废弃物（OMSW）是一种来自橄榄油通过两相离心系统提炼后的污染物废弃物。OMSW 具有高有机物含量和不平衡的碳氮比（C/N），为 31/1，这使得在这种废物的厌氧消化中难以获得高的甲烷产量。在本研究中，采用微藻杜氏盐藻作为共底物来进行 OMSW 厌氧消化，以降低 C/N 比并提高其可生物降解性。研究了不同的共消化混合物（C/N 比）。在共消化混合物中，杜氏盐藻从 25%增加到 50%，明显提高了单一底物的可生物降解性。在共消化混合物 50%OMSW-50%D.salina 中发现了最高的可生物降解性。然而，在共消化混合物 75%OMSW-25%D.salina 中获得了最大的甲烷产量 330mLCH4/gVSadded 和最高的甲烷产率，同时保持了接近 26.7/1 的 C/N 比。
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