Effect of liquid-to-solid ratio on semi-solid Fenton process in hazardous solid waste detoxication.
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.
Hu
Li-Fang
LF
Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, China.
Feng
Hua-Jun
HJ
Long
Yu-Yang
YY
Zheng
Yuan-Ge
YG
Fang
Cheng-Ran
CR
Shen
Dong-Sheng
DS
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*
D000814:Aniline Compounds; C045076:Fenton's reagent; D006256:Hazardous Waste; D014866:Waste Products; C008625:nitroaniline; D006861:Hydrogen Peroxide; D007501:Iron