Statistical modelling of the impact of some polyphenols on the efficiency of anaerobic digestion and the co-digestion of the wine distillery wastewater with dairy cattle manure and cheese whey

摘要

The objective of this study was to determine the effectiveness of anaerobic digestion in thentreatment of polyphenols (PP) present in olive mill wastewater (OMW) and wine distillerynwastewater (WDW). Anaerobic Toxicity Assay (ATA) was conducted to assess the impact of thenmost representative phenolic compounds present in OMW and WDW: catechol, tannins andnp-Coumaric acid, on biogas production. The results from this study show that tannins do notnpresent any inhibitory effect on methanogenesis at a concentration level of 1,664 ppm, whereasncatechol has an inhibitory effect at 1,664 ppm. In addition, p-Coumaric acid was stronglyninhibitory at 50 ppm. The co-digestion of OMW and WDW with other effluents was proposed as ansolution for reducing the load of PP in the anaerobic medium. Biochemical methane potentialn(BMP) tests were carried out for dairy cattle manure and mixtures of five PP. A central compositendesign was implemented on the BMP tests to model the biogas production response and thendegradation kinetics of PP. The co-digestion of WDW with cattle manure and/or whey was alsoninvestigated in BMP tests. The results show that the digestion was optimal at a ratio of 16: 64: 20n(WDW: manure: inoculum) with a maximum biogas yield of 172 mL/g of VS and 66% COD removal.