Phenolic wastewater is one of the priorities in the field of wastewater treatment,which poses a serious threat to the human health and nature environment.In this paper,cationic cetyltrimethylammonium bromide(CTAB)and ...Phenolic wastewater is one of the priorities in the field of wastewater treatment,which poses a serious threat to the human health and nature environment.In this paper,cationic cetyltrimethylammonium bromide(CTAB)and anionic sodium oleate(Na OL)microemulsions were utilized to extract phenol from the wastewater.The optimal extraction factors were investigated by exploring the effects of microemulsion composition ratio and extraction conditions on the phenol extraction performance.Furthermore,the enhanced extraction mechanism of phenol by cations microemulsions is illustrated by studying the extraction process of cationic and anionic microemulsions in the extraction of phenol.The optimum components were obtained:surfactant concentration of 0.2 mol·L^(-1),isoamyl alcohol volume of 30%,internal aqueous phase concentration of CTAB microemulsion of 0.05 mol·L^(-1),and internal aqueous phase concentration of Na OL microemulsion of 0.09 mol·L^(-1).The extraction efficiencies were 96.44%and 82.0%when using CTAB and Na OL microemulsions under optimal conditions(water-emulsion ratio of 5,contact time of 9 min,extraction temperature of 298.15 K,and p H of 9),confirming the enhanced extraction of phenol by CTAB cationic microemulsion.It was analyzed that the enhanced extraction of CTAB microemulsion was due to the electrostatic adsorption of cations with phenol root ions.展开更多
In this study, the O3/BAC/TiO2 catalytic method was used to treat the phenolic wastewater. During the experiments the effects of initial phenol concentration, ozone concentration, pH value, catalyst and other conditio...In this study, the O3/BAC/TiO2 catalytic method was used to treat the phenolic wastewater. During the experiments the effects of initial phenol concentration, ozone concentration, pH value, catalyst and other conditions on the phenol removal rate were investigated. The test results showed that when the phenol concentration was 0.1 g/L, the ozone-containing air flow rate was 0.05 m3/b, the ozone concentration was 3.58 mg/L, the pH value was 7.5, and the treating time was 30 minutes, the phenol removal rate reached 99%, with the COD removal rate equating to 55%. The property of treated wastewater could comply with the first-grade effluent specified in ＂Comprehensive Wastewater Discharge Standard＂ （GB8978--1996）.展开更多
基金sponsored by the National Natural Science Foundation of China(22225804)Shanghai Sailing Program,China(21YF1409500)+1 种基金the National Natural Science Foundation of China(22078102)the Education and Scientific Research Projects of Shanghai,China(19DZ1208201)。
文摘Phenolic wastewater is one of the priorities in the field of wastewater treatment,which poses a serious threat to the human health and nature environment.In this paper,cationic cetyltrimethylammonium bromide(CTAB)and anionic sodium oleate(Na OL)microemulsions were utilized to extract phenol from the wastewater.The optimal extraction factors were investigated by exploring the effects of microemulsion composition ratio and extraction conditions on the phenol extraction performance.Furthermore,the enhanced extraction mechanism of phenol by cations microemulsions is illustrated by studying the extraction process of cationic and anionic microemulsions in the extraction of phenol.The optimum components were obtained:surfactant concentration of 0.2 mol·L^(-1),isoamyl alcohol volume of 30%,internal aqueous phase concentration of CTAB microemulsion of 0.05 mol·L^(-1),and internal aqueous phase concentration of Na OL microemulsion of 0.09 mol·L^(-1).The extraction efficiencies were 96.44%and 82.0%when using CTAB and Na OL microemulsions under optimal conditions(water-emulsion ratio of 5,contact time of 9 min,extraction temperature of 298.15 K,and p H of 9),confirming the enhanced extraction of phenol by CTAB cationic microemulsion.It was analyzed that the enhanced extraction of CTAB microemulsion was due to the electrostatic adsorption of cations with phenol root ions.
文摘In this study, the O3/BAC/TiO2 catalytic method was used to treat the phenolic wastewater. During the experiments the effects of initial phenol concentration, ozone concentration, pH value, catalyst and other conditions on the phenol removal rate were investigated. The test results showed that when the phenol concentration was 0.1 g/L, the ozone-containing air flow rate was 0.05 m3/b, the ozone concentration was 3.58 mg/L, the pH value was 7.5, and the treating time was 30 minutes, the phenol removal rate reached 99%, with the COD removal rate equating to 55%. The property of treated wastewater could comply with the first-grade effluent specified in ＂Comprehensive Wastewater Discharge Standard＂ （GB8978--1996）.
