Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China.
Key Laboratory of Reservoir Aquatic Environment, Chinese Academy of Science, Chongqing, 400714, China.
Environ Sci Pollut Res Int. 2016 Nov;23(22):22761-22770. doi: 10.1007/s11356-016-7490-7. Epub 2016 Aug 25.
A pilot-scale side-stream reactor process with single-stage sludge alkaline treatment was employed to systematically investigate characteristics of excess sludge hydrolysis and acidification with alkaline treatment and evaluate feasibility of recovering a carbon source (C-source) from excess sludge to enhance nutrient removal at ambient temperature. The resulting C-source and volatile fatty acid specific yields reached 349.19 mg chemical oxygen demand (COD)/g volatile suspended solids (VSS) d and 121.3 mg COD/g VSS d, respectively, the process had excellent C-source recovery potential. The propionic-to-acetic acid ratio of the recovered C-source was 3.0 times that in the influent, which beneficially enhanced biological phosphorus removal. Large populations and varieties of hydrolytic acid producing bacteria cooperated with alkaline treatment to accelerate sludge hydrolysis and acidification. Physicochemical characteristics indicated that recovered C-source was derived primarily from extracellular polymeric substances hydrolysis rather than from cells disruption during alkaline treatment. This study showed that excess sludge as carbon source was successfully recycled by alkaline treatment in the process.
采用单级污泥碱处理的中试侧流反应器工艺，系统研究了碱性处理对剩余污泥水解酸化的特性，评估了从剩余污泥中回收碳源（C 源）以强化常温下营养物去除的可行性。所得 C 源和挥发性脂肪酸比产率分别达到 349.19mg 化学需氧量（COD）/g 挥发性悬浮固体（VSS）d 和 121.3mg COD/g VSS d，具有良好的 C 源回收潜力。回收 C 源的丙酸与乙酸比为进水的 3.0 倍，有利于增强生物除磷。大量水解产酸菌与碱性处理协同作用，加速了污泥的水解酸化。理化特性表明，回收的 C 源主要来源于胞外聚合物的水解，而不是碱性处理过程中细胞的破裂。本研究表明，在该工艺中，剩余污泥可通过碱性处理成功回收作为碳源。
