title: Improving the simultaneous removal of chemical oxygen demand and terephthalic acid in a cross-flow aerobic sludge reactor by using response surface methodology.
abstract: Central composite design and response surface methodology (RSM) were implemented to optimize the operational parameters for a cross-flow aerobic sludge reactor (CFASR) in remedying mixed printing and dyeing wastewater (MPDW). The individual and interactive effects of three variables, hydraulic retention time (HRT), pH and sludge loading rate (SLR), on chemical oxygen demand (COD) and terephthalic acid (TA) removal rates were evaluated. For HRT of 15.3-19.8 hours, pH of 7.2-8.1 and SLR of 0.4-0.6 kg chemical oxygen demand (COD) per kg mixed liquor suspended solids per day, COD and TA removal rates of the CFASR exceeded 85% and 90%, respectively. The check experiment revealed that the effluent from the optimized CFASR was stable below the limitation of 100 mg COD/L and the TA concentration decreased by 6.0% compared to the usual CFASR. The results verified that the RSM was useful for optimizing the operation parameters of the CFASR in remedying MPDW.
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, 202 Haihe Road, Harbin 150090, China E-mail: czbhdx@163.com; College of Environment and Resources, Dalian Minzu University, 18 Liaohe West Road, Dalian 116600, China.
authors.forename: Dong-Xue
authors.initials: DX
authors.lastname: Hu
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, 202 Haihe Road, Harbin 150090, China E-mail: czbhdx@163.com.
authors.forename: Yu
authors.initials: Y
authors.lastname: Tian
authors.affiliation: College of Environment and Resources, Dalian Minzu University, 18 Liaohe West Road, Dalian 116600, China.
authors.forename: Zhao-Bo
authors.initials: ZB
authors.lastname: Chen
authors.affiliation: College of Environment and Resources, Dalian Minzu University, 18 Liaohe West Road, Dalian 116600, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Ge
authors.affiliation: College of Environment and Resources, Dalian Minzu University, 18 Liaohe West Road, Dalian 116600, China.
authors.forename: Yu-Bo
authors.initials: YB
authors.lastname: Cui
authors.affiliation: College of Environment and Resources, Dalian Minzu University, 18 Liaohe West Road, Dalian 116600, China.
authors.forename: Chun-Qiu
authors.initials: CQ
authors.lastname: Ran
mesh_terms: D000332:Aerobiosis; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D004396:Coloring Agents; D010795:Phthalic Acids / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000737:chemistry
chemical_list: D004396:Coloring Agents; D010795:Phthalic Acids; D012722:Sewage; D062065:Wastewater; C011363:terephthalic acid