【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。更多还原

【Abstract】 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 to49. 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.更多还原