Water Technology Centre, Av. Diagonal, Barcelona, Spain.
Water Sci Technol. 2012;65(2):214-20. doi: 10.2166/wst.2012.660.
Many drivers tend to foster the development of renewable energy production in wastewater treatment plants as many expectations rely upon energy recovery from sewage sludge, for example through biogas use. This paper is focused on the assessment of grease waste (GW) as an adequate substrate for co-digestion with municipal sludge, as it has a methane potential of 479-710 LCH(4)/kg VS, as well as the evaluation of disintegration technologies as a method to optimize the co-digestion process. With this objective three different pre-treatments have been selected for evaluation: thermal hydrolysis, ultrasound and enzymatic treatment. Results have shown that co-digestion processes without pre-treatment had a maximum increment of 128% of the volumetric methane productivity when GW addition was 23% inlet (at 20 days of HRT and with an OLR of 3.0 kg COD/m(3)d), compared with conventional digestion of sewage sludge alone. Concerning the application of the selected disintegration technologies, all pre-treatments showed improvements in terms of methane yield (51.8, 89.5 and 57.6% more for thermal hydrolysis, ultrasound and enzymatic treatment, respectively, compared with non-pretreated wastes), thermal hydrolysis of GW and secondary sludge being the best configuration as it improved the solubilization of the organic matter and the hydrodynamic characteristics of digestates.
许多司机倾向于促进废水处理厂中可再生能源的生产，因为许多人都期望从污水污泥中回收能源，例如通过沼气的利用。本文主要集中于评估油脂废物（GW）作为与市政污泥共消化的合适底物的能力，因为其甲烷潜能为 479-710 LCH4/kgVS，同时评估了作为优化共消化过程的方法的分解技术。为此，选择了三种不同的预处理方法进行评估：热水解，超声和酶处理。结果表明，当 GW 添加量为 23%（在 20 天的 HRT 和 3.0 kg COD/m3d 的 OLR 下）时，未经预处理的共消化过程与单独消化污水污泥相比，其体积甲烷生产率最大增加了 128%。关于所选择的分解技术的应用，所有预处理方法均显示出甲烷产量的提高（与未经预处理的废物相比，热水解，超声和酶处理分别提高了 51.8、89.5 和 57.6%），GW 和二级污泥的热水解是最佳配置，因为它提高了有机物的溶解和消化物的流体动力学特性。
