title: Formulation and optimization of biological removal of flue gas pretreatment wastewater and sulfur recycling process by Box-Behnken design.
abstract: The aim of this study was to investigate optimum conditions for biological removal of flue gas pretreatment wastewater and achieve maximum elemental sulfur yield. A three-factor, three-level Box-Behnken design was used to derive a second-order polynomial equation and construct contour plots to predict responses. The independent variables selected were hydraulic retention time (X₁), inlet sulfate concentration (X₂), and air flow (X₃). Fifteen batches were done in a biological united system and evaluated for elemental sulfur yield (Y₁). The transformed values of the independent variables and Y₁ were subjected to a full-model second-order polynomial equation. The equation was modified based on Fisher's F- and probability P-values. The computer optimization process and contour plots predicted the values of independent variables X₁, X₂ and X₃ (16 h, 1,348 mg L⁻¹ and 165 L h⁻¹ respectively), for maximized response of Y₁. The experimental results at predicted conditions demonstrate that the modified model equation has good applicability to the practical system.
authors.affiliation: School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China. 963132095@qq.com
authors.forename: Juan
authors.initials: J
authors.lastname: Wang
authors.forename: Yuan
authors.initials: Y
authors.lastname: Cao
authors.forename: Qin
authors.initials: Q
authors.lastname: Zhong
mesh_terms: D000393:Air Pollutants / Q000737:chemistry*; D019149:Bioreactors; D005740:Gases / Q000737:chemistry*; D007220:Industrial Waste; D059027:Recycling; D013455:Sulfur / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D000393:Air Pollutants; D005740:Gases; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D013455:Sulfur