title: Influence of carrier filling ratio on the performance of moving bed biofilm reactor in treating coking wastewater.
abstract: This study aims to evaluate the effect of carrier filling ratio on the performance of a moving bed biofilm reactor in degrading chemical oxygen demand, phenol, thiocyanate, and ammonia from coking wastewater at 20h of hydraulic retention time. The operational experiments under different carrier filling ratios ranging from 20% to 60% were investigated. The maximum removal efficiency of 89%, 99% and 99% for COD, phenol and thiocyanate, and minimum sensitivity to the increasing contaminants concentration in the influent were achieved at 50% carrier filling ratio. The Haldane competitive substrate inhibition kinetics model was used to describe the relationship between the oxygen uptake rate of ammonium oxidizers and the concentration of free ammonium. The highest biofilm microbial community functional diversity (Shannon's diversity index, H') and evenness (Shannon's evenness index, E') were obtained at 50% carrier filling ratio in all runs using a Biolog ECO microplate.
authors.affiliation: School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China. Electronic address: guqiyuan1984@gmail.com.
authors.forename: Qiyuan
authors.initials: Q
authors.lastname: Gu
authors.affiliation: School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China. Electronic address: suntc@ces.ustb.edu.cn.
authors.forename: Tichang
authors.initials: T
authors.lastname: Sun
authors.affiliation: Basic Research Service, Ministry of Science and Technology of the People's Republic of China, Beijing 100862, China. Electronic address: wugen0991@gmail.com.
authors.forename: Gen
authors.initials: G
authors.lastname: Wu
authors.affiliation: School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China. Electronic address: mingyue11.17@qq.com.
authors.forename: Mingyue
authors.initials: M
authors.lastname: Li
authors.affiliation: State Key Laboratory of Urban Water Resources and Environment, Harbin Institute of Technology, Harbin 150090, China; School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. Electronic address: qiuweihit@126.com.
authors.forename: Wei
authors.initials: W
authors.lastname: Qiu
mesh_terms: D000641:Ammonia / Q000378:metabolism; D018441:Biofilms / Q000254:growth & development*; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology*; D003077:Coke; D007700:Kinetics; D010636:Phenols / Q000378:metabolism; D013861:Thiocyanates / Q000378:metabolism; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D000641:Ammonia; D003077:Coke; D010636:Phenols; D013861:Thiocyanates; D062065:Wastewater; D014874:Water Pollutants, Chemical; C031760:thiocyanate
keywords: Carrier filling ratio; Coking wastewater; Microorganism activity; Moving bed biofilm reactor