摘要
利用限氧控温炭化法制备浒苔基生物炭,探讨了不同热解温度(200、300、400、500和600℃)对生物炭产率、生物炭重金属(Cu、Zn、Cr、Cd、Pb、As、Hg)总量及其水溶态重金属含量的影响。结果表明:生物炭产率随热解温度升高而降低。生物炭中Cu、Zn、Cr、Cd、Pb含量较原料均有显著增加,而As和Hg含量均低于原料。总体上热解碳化可促进浒苔基生物炭中Cu、Zn、Cr、Cd及As的挥发迁移趋势,但Pb则呈现富集趋势。此外,生物炭水溶态重金属含量低于原料,且热解温度与水溶态重金属含量呈负相关性,表明热解过程可降低这些重金属的溶出。
Biochar was produced from Ulva prolifera by using oxygen-limited and temperature-controlled pyrolysis at temperatures of 200,300,400,500 and 600℃.The effects of pyrolysis temperature on the yield,the bulk and water-soluble heavy metal(Cu,Zn,Cr,Cd,Pb,As,Hg)contents in biochars were investigated.The results showed that the yield of biochar decreased with the increase of pyrolysis temperature.The contents of Cu,Zn,Cr,Cd and Pb in U.prolifera-derived biochar were significantly higher than those in U.prolifera,but converse changes were observed in the contents of As and Hg.In general,pyrolysis and carbonization may promote the volatile migration of Cu,Zn,Cr,Cd and As in the U.prolifera-derived biochar,while Pb in biochar exhibited a high enrichment trend.In addition,the contents of water-soluble heavy metals in biochars were lower than those in raw biomass,and the pyrolysis temperature was negatively correlated with the contents of water-soluble heavy metals,indicating that the pyrolysis process could reduce the dissolution of these heavy metals.
作者
缪诗超
吴伟
傅宇
周筱田
郭远明
杨承虎
MIAO Shichao;WU Wei;FU Yu;ZHOU Xiaotian;GUO Yuanming;YANG Chenghu(Marine and Fisheries Research Institute,Zhejiang Ocean University,Zhoushan 316021,China;Key Laboratory of Sustainable Utilization of Technology Research for Fisheries Resources of Zhejiang Province,Marine Fisheries Research Institute of Zhejiang,Zhoushan 316021,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2019年第12期163-167,172,共6页
Environmental Science & Technology
基金
国家自然科学基金青年基金(31800430)
舟山市科技计划项目(2018C31079)
浙江省海洋水产研究所博士启动基金项目(20170002)。
关键词
热解温度
浒苔
生物炭
重金属
水溶态
pyrolysis temperature
Ulva prolifera
biochar
heavy metals
water-soluble
