Intensification of fermentation and anaerobic digestion processes for resource recovery from municipal wastes

从废物中回收资源已成为获取增值产品的一种流行战略，因此，人们的兴趣和研究集中在能够支持这些废物转化为价值倡议的技术上。厌氧消化(AD)是目前应用最广泛的城市污水污泥稳定化工艺。除AD过程中的污泥减量外，还可以回收沼气。然而，颗粒有机物的水解仍然是传统AD面临的一个重大挑战。因此，需要有效、经济的前处理技术。另一方面，通过暗发酵产生的挥发性脂肪酸(VFA)由于在制药、食品和化工等行业中的广泛应用而具有很高的市场需求。VFAS生产的主要挑战是从生产后的废流中回收它们。本方案的两个主要目的是：(A)评价游离亚硝酸和双氧水联合预处理对浓缩后活性污泥厌氧消化的影响；(B)探讨发酵过程与真空加压强化相结合的可行性。

Resource recovery from waste has become a popular strategy for capturing of value added products and thus, interest and research are focused on technologies that can support these waste-to-value initiatives. Anaerobic digestion (AD) is the most widely used stabilization process for municipal sewage sludge. In addition to sludge reduction during AD, methane gas can be recovered. However, hydrolysis of particulate organics remains a significant challenge for conventional AD. Therefore, effective and economic pre-treatment techniques are required. on the other hand, volatile fatty acids (VFAs) that produced by dark fermentation have a high market demand as they are used extensively in the pharmaceutical, food, and chemical industries. The main challenge of VFAs production is recovering them from waste streams after it get produced. The main two objectives of this proposal are: (a) evaluate the effect of combined free nitrous acids and hydrogen peroxide pre-treatment on the anaerobic digestibility of thickened waste activated sludge, (b) investigate the feasibility of combining fermentation process with intensification by vacuum pressure.