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PCDDs, PCDFs and PCNs in products of microwave-assisted pyrolysis of woody biomass : Distribution among solid, liquid and gaseous phases and effects of material composition

机译:微波辅助木质生物质热解产物中的PCDDs,PCDFs和PCNs:固相,液相和气相之间的分布以及材料组成的影响

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摘要

Microwave-assisted pyrolysis (MAP) of lignocellulosic biomass is a technique that could potentially be used to produce and upgrade renewable energy carriers. However, there is no available information about the formation of dioxins and other organic pollutants in MAP treatment of woody biomass. In this study, MAP experiments were conducted in lab-scale using virgin softwood, bark, and impregnated wood as feedstocks. The non-condensable gas, liquid (fractionated into aqueous and oil phases), and char fractions generated during pyrolysis were collected and analysed for polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs) and naphthalenes (PCNs). The concentrations of PCDDs, PCDFs and PCNs in the pyrolysis products ranged from 0.52 to 43.7 ng kg(-1). All investigated compound groups were most abundant in the oil fraction, accounting for up to 68% (w/w) of the total concentrations. The highest PCDD, PCDF and PCN concentrations were found from the pyrolysis of bark, which has relatively high contents of chlorine and mineral matter, followed by impregnated wood, which contains organic and metal-based preservatives. The homologue profiles of all three compound groups were dominated by the less chlorinated homologues. The homologue abundance decreased as the degree of chlorination increased. This trend was observed for all three feedstocks.
机译:木质纤维素生物质的微波辅助热解(MAP)是一种可以潜在地用于生产和升级可再生能源载体的技术。但是,没有关于MAP处理木质生物量时二恶英和其他有机污染物形成的可用信息。在这项研究中,以纯软木,树皮和浸渍木材为原料,在实验室规模内进行了MAP实验。收集并分析在热解过程中产生的不可冷凝的气体,液体(分为水相和油相)和炭馏分,并分析多氯代二苯并对二恶英(PCDD),二苯并呋喃(PCDF)和萘(PCN)。热解产物中PCDD,PCDF和PCN的浓度范围为0.52至43.7 ng kg(-1)。所有研究的化合物组中油类成分最多,占总浓度的68%(w / w)。从树皮的热解中发现了最高的PCDD,PCDF和PCN浓度,该树皮具有较高的氯和矿物质含量,其次是浸渍的木材,其中包含有机和金属基防腐剂。所有三个化合物组的同系物谱由较少氯化的同系物主导。随着氯化度的增加,同系物的丰度降低。对于所有三种原料都观察到了这种趋势。

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