摘要
水热碳化作为废弃生物质资源化利用的新兴工艺技术,可弥补我国城市污泥资源化处理方式的不足。实验研究了反应温度和时间对污泥水热产物性质的影响,并探究了水热炭通过KOH改性后对溶液重金属的吸附性能。结果表明:提高温度和延长时间有利于提升水热炭稳定程度与吸附性能;综合考量吸附效果与制备成本,确定水热碳化反应温度220℃和反应时间1 h为最佳反应条件;水热炭活化后对溶液中铜和镉的吸附性能良好,饱和吸附量分别达到49. 89,52. 04 mg/g,吸附过程可用Lagergren伪二级动力学模型和Langmuir/Freundlich吸附等温模型进行较好地拟合。
As an emerging recycling treatment process of biomass waste, hydrothermal carbonization can make up for the shortage of recycling disposal of municipal sludge in China. The experiment studied the influence of reaction temperature and time on the properties of hydrothermal products from sludge, and the absorption properties of hydrochar for heavy metals in solution after KOH modification. The results indicated that the increase of temperature and time was beneficial for the improvement of stability and adsorption properties of the hydrochar. After comprehensive consideration of the adsorption effect and preparation cost, it was determined that the optimal reaction condition was 220 ℃-1 h. The hydrochar after activation showed high adsorption properties for copper and cadmium in solution, for which the saturated adsorption capacities were up to 49.89, 52.04 mg/g, respectively. The adsorption process can be well fitted by Lagergren pseudo-second-order dynamic model as well as Langmuir/Freundlich adsorption isotherm model.
作者
王航
杨子健
刘阳生
WANG Hang;YANG Zi-jian;LIU Yang-sheng(Beijing Key Laboratory for Solid Waste Utilization and Management,College of Environmental Sciences and Engineering,Peking University,Beijing 100871,China)
出处
《环境工程》
CAS
CSCD
北大核心
2019年第5期4-11,共8页
Environmental Engineering
基金
深圳市科创委重点专项(JCYJ20160330095359100)
关键词
城市污泥
水热碳化
碱改性
吸附
重金属
municipal sludge
hydrothermal carbonization
alkali-modification
absorption
heavy metals
