摘要
污泥碳化为当前剩余污泥的妥善处置提供了新方法,由此转化产生的污泥炭可作为土壤修复和改良剂进行资源化利用。为探讨不同的碳化方法对污泥炭特性的影响,分别采用了干法碳化和湿法碳化(水热碳化)对生活污水处理厂的剩余污泥进行处理。结果表明,碳化处理后C、O元素的质量分数均下降,N元素的质量分数则有所增加。与干法碳化相比,水热碳化保留了较多的有机碳。干法碳化后的污泥炭较原污泥呈现弱碱化,而水热碳化则显示酸化趋势。此外,与干法碳化相比,水热碳化在富集有效营养元素(磷、氮)和固定重金属浸出风险上均表现出明显的优势。这些结果预示着水热碳化法在污泥资源化处理方面的巨大潜能。
Carbonization has provided with a novel method for the treatment of wastewater sludge,the biochars derived by which can be applied for soil remediation. To compare different methods as regard to the characteristics of their products,hydrothermal carbonization and dry pyrolysis were employed to treat with the sludge collected from a local domestic wastewater treatment plant in the present study. Results showed that elemental contents of C and O decreased while that of N increased after the treatment. More organic carbon was retained by hydrothermal carbonization than dry pyrolysis. Chars derived from dry approach had higher p H than the raw sludge,while hydrochars from hydrothermal approach had lower p H. Besides,the wet approach also showed obvious advantages in concentration of available N and P,as well as in the fixation of heavy metals,which indicated large potential of hydrothermal carbonization for the wastewater sludge treatment and utilization.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2015年第10期78-83,共6页
Environmental Science & Technology
基金
国家自然科学基金(31300399)
粤港关键领域重点突破项目(2012A090200001)
关键词
污泥
热裂解
水热碳化
污泥炭
sludge
dry pyrolysis
hydrothermal carbonization
biochar
