GIRO Technological Centre, Rbla. Pompeu Fabra 1, E-08100 Mollet del Vallès, Barcelona, Spain.
Bioresour Technol. 2011 Jul;102(13):6830-6. doi: 10.1016/j.biortech.2011.04.019. Epub 2011 Apr 14.
The feasibility of sewage sludge co-digestion using intermediate waste generated inside a wastewater treatment plant, i.e. trapped grease waste from the dissolved air flotation unit, has been assessed in a continuous stirred lab reactor operating at 35°C with a hydraulic retention time of 20 days. Three different periods of co-digestion were carried out as the grease waste dose was increased. When the grease waste addition was 23% of the volatile solids fed (organic loading rate 3.0 kg(COD)m(-3)d(-1)), an increase in methane yield of 138% was reported. Specific activity tests suggested that anaerobic biomass had adapted to the co-substrate. The adapted inoculum showed higher acetoclastic methanogenic and β-oxidation synthrophic acetogenic activities but lower hydrogenotrophic methanogenic activity. The results indicate that a slow increase in the grease waste dose could be a strategy that favours biomass acclimation to fat-rich co-substrate, increases long chain fatty acid degradation and reduces the latter's inhibitory effect.
已经在 35°C 下运行的水力停留时间为 20 天的连续搅拌实验室反应器中评估了使用污水处理厂内产生的中间废物（即气浮单元的捕集油脂废物）进行污水污泥共消化的可行性。共消化进行了三个不同的阶段，随着油脂废物的添加量增加。当油脂废物添加量为挥发性固体进料的 23%（有机负荷 3.0 kg(COD)m(-3)d(-1)）时，甲烷产量增加了 138%。比活性测试表明，厌氧生物量已经适应了共底物。适应的接种物表现出更高的乙酰化甲烷生成和β-氧化合性产乙酸活性，但氢营养型甲烷生成活性较低。结果表明，缓慢增加油脂废物剂量可以是一种有利于生物量适应富含脂肪的共底物、增加长链脂肪酸降解并降低后者抑制作用的策略。
