Chitosan modified sludge hydrochar activated peroxydisulfate to degradate activated black 5 dyeing wastewater
Printing and dyeing wastewater is difficult to treat biologically due to property of low biodegradability.By doping chitosan in the wasted sludge,modified biochar(CBC)was prepared by hydrothermal treatment and was used to activate peroxydisulfate(PDS)to achieve efficient degradation of activated black 5(RB5)dyeing wastewater.The CBC prepared under the condition of hydrothermal temperature of 200 ℃ and hydrothermal time 6 h showed the best RB5 removal effect,achieving a removal rate of 100％at 60 min.In addition,the best performance was obtained with a PDS dosage of 2 mmol·L-1,a CBC dosage of 5 g·L-1 and an initial pH of 5.The Cl-and NO3-in the reaction system had almost no effect on RB5 removal,while the PO43-and HCO3-exhibited a significant inhibitory impact.The mechanism study confirmed that the singlet oxygen(1O2)played a major contribution to the degradation of RB5 rather than sulfate radical,which is common in PDS oxidation systems.
NETL
NSTL
万方数据
