摘要
生物质废物催化热解所得生物油中富含多环芳烃(PAHs)污染物,但其分布特征及相应影响因素尚缺乏深入探讨。以Co3O4为催化剂,采用管式炉反应器在不同温度下热解水曲柳木屑制备生物油,并分析其化学组分和16种PAHs污染物分布特征。结果表明,生物油中以酚类化合物为主,而PAHs污染物的种类与含量均随反应温度的升高而增加,PAHs总含量从389.60μg·g-1(400℃)攀升至105 435.12μg·g-1(700℃)。同时,将CO2引入热解气氛,利用Box-Benhnken曲面响应法对催化热解过程的多个工艺因素进行优化。结果显示,在热解温度为511℃、停留时间为12.7 min、热解气氛的CO2/N2比例为88/12时,生物油产率达到最大值,约45%。研究结果对生物质废物的高效、低污染资源化利用具有参考价值。
Bio-oil obtained from biomass pyrolysis contains polycyclic aromatic hydrocarbons(PAHs)pollutants,which are teratogenic,carcinogenic,and mutagenic to humans.As a result,it causes a concern about the potential risk for environmental and human health during its subsequent processing.In this study,Co3O4 was used as a catalyst to perform saw dust pyrolysis for bio-oil production in a tube furnace reactor.The chemical composition of the bio-oil and the distribution of 16 kinds of PAHs were analyzed.The results showed that the bio-oil mainly consisted of phenolic compounds;the species and content of PAHs in bio-oil increased with the rise of pyrolysis temperature,and the amount of the total PAHs sharply increased from 389.60μg·g-1 at 400℃to 105 435.12μg·g-1at 700℃.At the same time,CO2 was induced into the pyrolysis atmosphere,an optimization of multiple pyrolysis factors for the bio-oil yield was performed by using Box-Benhnken response surface method,and it was found that the highest yield of bio-oil was achieved with a value of about 45%at the pyrolysis temperature of 511℃,the residence time of 12.7 min and the CO2/N2 ratio of 88/12 in the reaction atmosphere.This study will provide a reference for the high effective and low pollution resource recycling of biomass waste.
作者
何峣
陈思
陈俊捷
宁寻安
HE Yao;CHEN Si;CHEN Junjie;NING Xunan(Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control,Institute of Environmental Health and Pollution Control,School of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou 510006,China.)
出处
《环境工程学报》
CAS
CSCD
北大核心
2019年第7期1743-1751,共9页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51806040,21577027)
广东省省级科技计划项目(2015B020235013)
工业聚集区污染控制与生态修复教育部重点实验室开放基金
关键词
催化热解
生物油
多环芳烃
曲面响应法
CO2
catalytic pyrolysis
bio-oil
polycyclic aromatic hydrocarbons
surface response method
carbon dioxide
