Anaerobic degradation of olive mill wastewater (OMW) at concentrations ranging from 2 to 100 g/L of chemical oxygen demand (COD) was assessed in batch assays. Methane was the main final product obtained for the lower concentrations tested. For 25 g COD/L, H2 was temporarily produced, albeit H2 depletion occurred, likely due to homoacetogenesis, since acetate was formed concomitantly. Hydrogen was produced and accumulated permanently in the assays containing 50 g COD/L of OMW. Methanogenesis and homoacetogenesis were naturally inhibited, suggesting that hydrogen recovery from OMW can be performed without the addition of methanogenic suppressors such as 2-bromoethanosulfonate. This fact opens new perspectives for the utilization of high OMW concentrations in a two-stage valorisation process combining biohydrogen and biomethane production.
展开▼
机译：通过分批测定评估了2至100 g / L化学需氧量（COD）浓度范围内的橄榄磨废水（OMW）的厌氧降解。对于较低的测试浓度，甲烷是获得的主要最终产品。对于25 g COD / L，H2是暂时产生的，尽管由于同乙酸的产生而发生了H2的消耗，因为乙酸是同时形成的。在含有50 g COD / L OMW的测定中，氢气产生并永久积累。甲烷生成和同乙醛生成自然受到抑制，这表明无需添加甲烷生成抑制剂（如2-溴乙基磺酸盐）即可从OMW回收氢气。这一事实为结合生物氢和生物甲烷生产的两阶段增值过程中利用高OMW浓度开辟了新的前景。
展开▼
