Enhancing Anaerobic Digestibility of Municipal Sludges by Physicochemical Pre-treatment

随着城市污水污泥数量的不断增加，处理的质量和水平在加拿大和世界许多地方都受到严重关注，具体来说，加拿大每年产生约66万吨。随着对污泥处置的严格规定的实施和越来越多的堆填区关闭，污泥管理变得越来越具有挑战性。目前，大多数现有厌氧沼气池的挥发性固体稳定效率一般且相对较低，而且生物固体难以脱水，需要较高的化学调理剂量。如果该项目成功，稳定效率将显著提高，目标是持续生产A类生物固体（用于无限制的土地处置）。此外，将实现更高的沼气和能源产量。本研究的主要目标是开发一种新的污泥预处理工艺模型，该模型使用物理化学剂（如温度和压力）以及化学剂（如过氧化氢和游离亚硝酸盐）。此外，本研究项目旨在了解粒径分布（全谱分布）对城市二次污泥水解速率系数和可生化性的影响。

With increasing quantity of municipal sewage sludge, the quality and level of treatment are of serious concern in Canada and many parts of the world, specifically, about 660,000 tons are produced annually in Canada. With the implementation of strict regulations on sludge disposal and closure of more landfills, sludge management is becoming increasingly challenging. Currently, not only the volatile solids stabilization efficiency of most existing anaerobic digesters is modest and relatively low but also the biosolids are difficult to dewater requiring high chemical conditioning doses. If this project is successful, stabilization efficiency will improve significantly targeting to consistently produce Class A biosolids (for unrestricted land disposal). Furthermore, higher biogas and energy production will be achieved. The main goal of this research is to develop a novel sludge pre-treatment process model using physicochemical agents such as temperature and pressure together with chemicals such as hydrogen peroxide, and free nitrous acid. Furthermore, this research project aims to understand the effect of the particle size distribution (full spectra distribution) on the hydrolysis rate coefficient and the biodegradability of municipal secondary sludges.