壳聚糖改性污泥水热炭活化过硫酸盐降解活性黑5染料废水
Chitosan modified sludge hydrochar activated peroxydisulfate to degradate activated black 5 dyeing wastewater
于露滢 1陈红 2于鑫 1王凯 1曾可佳 1叶沁辉 1郑凯远1
作者信息
- 1. 东华大学环境科学与工程学院,上海,201600
- 2. 东华大学环境科学与工程学院,上海,201600;全国循环经济工程实验室,上海,210620
- 折叠
摘要
印染废水可生化性低,生物处理难度大.通过在剩余污泥中掺杂壳聚糖,经水热处理制备出壳聚糖改性生物炭(CBC),并用于活化过二硫酸盐(PDS),实现对活性黑5(RB5)染料废水的高效降解.在水热温度为200℃,水热时间为6 h时制备的CBC对RB5的去除效果最优,反应60 min去除率可达到100％.此外,PDS投量为2mmol·L-1,CBC投量为5g·L-1,初始pH=5时反应效果最佳.反应系统中的Cl-和NO3-对RB5去除几乎无影响,而PO43-、HCO3-有明显抑制作用.机理研究证实了单线态氧(1O2)对RB5的降解起主要贡献,而不是PDS氧化体系常见的硫酸根自由基.
Abstract
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.
关键词
高级氧化/水热炭/染料废水/单线态氧Key words
advanced oxidation/hydrochar/dye wastewater/singlet oxygen引用本文复制引用
基金项目
国家自然科学基金(52070040)
国家自然科学基金(51878136)
出版年
2024
NETL
NSTL
万方数据