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Co_3O_4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CO_2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CO_2/N_2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,Co_3O_4 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~(-1)at 700℃.At the same time,CO_2 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 CO_2/N_2 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.
引文
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