title: Effect of liquid-to-solid ratio on semi-solid Fenton process in hazardous solid waste detoxication.
abstract: The liquid-to-solid ratio (L/S) of semi-solid Fenton process (SSFP) designated for hazardous solid waste detoxication was investigated. The removal and minimization effects of o-nitroaniline (ONA) in simulate solid waste residue (SSWR) from organic arsenic industry was evaluated by total organic carbon (TOC) and ONA removal efficiency, respectively. Initially, Box-Behnken design (BBD) and response surface methodology (RSM) were used to optimize the key factors of SSFP. Results showed that the removal rates of TOC and ONA decreased as L/S increased. Subsequently, four target initial ONA concentrations including 100 mg kg(-1), 1 g kg(-1), 10 g kg(-1), and 100 gk g(-1) on a dry basis were evaluated for the effect of L/S. A significant cubic empirical model between the initial ONA concentration and L/S was successfully developed to predict the optimal L/S for given initial ONA concentration for SSFP. Moreover, an optimized operation strategy of multi-SSFP for different cases was determined based on the residual target pollutant concentration and the corresponding environmental conditions. It showed that the total L/S of multi-SSFP in all tested scenarios was no greater than 3.8, which is lower than the conventional slurry systems (L/S ≥ 5). The multi-SSFP is environment-friendly when it used for detoxication of hazardous solid waste contaminated by ONA and provides a potential method for the detoxication of hazardous solid waste contaminated by organics.
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, China.
authors.forename: Li-Fang
authors.initials: LF
authors.lastname: Hu
authors.forename: Hua-Jun
authors.initials: HJ
authors.lastname: Feng
authors.forename: Yu-Yang
authors.initials: YY
authors.lastname: Long
authors.forename: Yuan-Ge
authors.initials: YG
authors.lastname: Zheng
authors.forename: Cheng-Ran
authors.initials: CR
authors.lastname: Fang
authors.forename: Dong-Sheng
authors.initials: DS
authors.lastname: Shen
mesh_terms: D000814:Aniline Compounds / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D006256:Hazardous Waste; D006861:Hydrogen Peroxide / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D012037:Refuse Disposal / Q000379:methods*; D014866:Waste Products / Q000032:analysis*
chemical_list: D000814:Aniline Compounds; C045076:Fenton's reagent; D006256:Hazardous Waste; D014866:Waste Products; C008625:nitroaniline; D006861:Hydrogen Peroxide; D007501:Iron