ABSTRACT

The technology of anaerobic co-digestion to treat the excess biological sludge discharged from activated sludge systems in oil refineries was evaluated in bench scale experiments. Mixing food waste rich in fruits and vegetables with this sludge increased the reduction of volatile solids and biogas yield. An experimental design indicated that the best co-digestion condition was the use of waste activated sludge without previous dewatering (3.5% total solids) and food waste in an 80:20 ratio (% v/v), without the addition of inoculum. After 45 days at 35 °C, this condition resulted in volatile solid (VS) removal of 52% and biogas yield of 80.7 mL biogas/g VS_added, against only 19% and 38.5 mL biogas/g VS_added in mono-digestion of sludge alone. Anaerobic co-digestion demonstrates promising results and the potential for a simple and effective treatment method for excess biological sludge generated at refineries.

摘要

厌氧共消化处理炼油厂活性污泥系统排放的过量生物污泥的技术在台架试验中进行了评估。将富含水果和蔬菜的食物垃圾与这种污泥混合，可减少挥发性固体和沼气产量。实验设计表明，最好的共同消化条件是使用未经脱水的废活性污泥（总固体含量为 3.5%）和食物垃圾，比例为 80:20（% v/v），不添加接种物。在 35 °C 下 45 天后，此条件导致挥发性固体 (VS) 去除 52%，沼气产量为 80.7 mL 沼气/g VS_{添加，而仅添加}19% 和 38.5 mL 沼气/g VS仅在污泥的单一消化中。厌氧共消化显示出有希望的结果，以及一种简单有效的处理炼油厂产生的过量生物污泥的方法的潜力。