title: Role of carbon substrates in facilitating energy reduction and resource recovery in a traditional activated sludge process: investigation from a biokinetics modeling perspective.
abstract: Three activated sludge processes (ASPs) were modeled and driven by dissolved complex organics (F-ASP), propionic acid (P-ASP), and acetic acid (A-ASP), and various parameters were subsequently estimated. The energy depletion for carbon removal was 0.146, 0.120, and 0.119 kWh/m(3) of treated wastewater for F-ASP, P-ASP, and A-ASP, respectively, suggesting that acetic acid can forward energy conservation. The ratio of substrate storage to oxidation in F-ASP, P-ASP, and A-ASP was 0, 0.25, and 0.52, respectively, further demonstrating that substrate eliminations from P-ASP and A-ASP were both dominated by substrate storage for polymer production, not by total oxidation; thus, they exhibited lower energy-consuming levels than F-ASP. Quantification of bioenergy production and nutrient acquisition from the excess sludge of the three ASPs were conducted subsequently, and A-ASP was found to facilitate phosphorus capture.
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China. wangxu_office@163.com
authors.forename: Xu
authors.initials: X
authors.lastname: Wang
authors.forename: Junxin
authors.initials: J
authors.lastname: Liu
authors.forename: Bo
authors.initials: B
authors.lastname: Qu
authors.forename: Nan-Qi
authors.initials: NQ
authors.lastname: Ren
authors.forename: Jiuhui
authors.initials: J
authors.lastname: Qu
mesh_terms: D061249:Batch Cell Culture Techniques; D057919:Biological Oxygen Demand Analysis; D002244:Carbon / Q000737:chemistry*; D004560:Electricity; D007700:Kinetics; D008962:Models, Theoretical; D009584:Nitrogen / Q000302:isolation & purification; D010084:Oxidation-Reduction; D010710:Phosphates / Q000302:isolation & purification; D010758:Phosphorus / Q000302:isolation & purification; D012722:Sewage / Q000737:chemistry* / Q000382:microbiology*; D012995:Solubility; D013816:Thermodynamics; D014835:Volatilization
chemical_list: D010710:Phosphates; D012722:Sewage; D010758:Phosphorus; D002244:Carbon; D009584:Nitrogen