title: Enhanced excess sludge hydrolysis and acidification in an activated sludge side-stream reactor process with single-stage sludge alkaline treatment: a pilot scale study.
abstract: 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-1and 121.3 mg COD/g VSS d-1, 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.
authors: 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.
authors: Peng
authors: P
authors: Yan
authors: 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.
authors: Jin-Song
authors: JS
authors: Guo
authors: Chongqing Jianzhu College, Chongqing, 400072, China.
authors: Jing
authors: J
authors: Wang
authors: Key Laboratory of the Three Gorges Reservoir Region's Eco-Environments of MOE, Chongqing University, Chongqing, 400045, China.
authors: Fang-Ying
authors: FY
authors: Ji
authors: Key Laboratory of the Three Gorges Reservoir Region's Eco-Environments of MOE, Chongqing University, Chongqing, 400045, China.
authors: Cheng-Cheng
authors: CC
authors: Zhang
authors: Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China. ypchen@cigit.ac.cn.|Key Laboratory of Reservoir Aquatic Environment, Chinese Academy of Science, Chongqing, 400714, China. ypchen@cigit.ac.cn.
authors: You-Peng
authors: YP
authors: Chen
authors: Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China. shenyu@cigit.ac.cn.|Key Laboratory of Reservoir Aquatic Environment, Chinese Academy of Science, Chongqing, 400714, China. shenyu@cigit.ac.cn.
authors: Yu
authors: Y
authors: Shen
mesh_terms: D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology*; D002244:Carbon / Q000737:chemistry*; D005232:Fatty Acids, Volatile / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D059013:Microbial Consortia; D009584:Nitrogen / Q000302:isolation & purification; D010316:Particle Size; D010758:Phosphorus / Q000302:isolation & purification; D010865:Pilot Projects; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid; D018505:Waste Management / Q000379:methods*
chemical_list: D005232:Fatty Acids, Volatile; D012722:Sewage; D010758:Phosphorus; D002244:Carbon; D009584:Nitrogen
keywords: Alkaline treatment; Carbon source recovery; Enhanced nutrient removal; Excess sludge; Pilot-scale; Single-stage