Toward a Circular Economy: Decontamination and Valorization of Postconsumer Waste Wood Using the ionoSolv Process
Toward a Circular Economy: Decontamination and Valorization of Postconsumer Waste Wood Using the ionoSolv Process
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DOI：
10.1021/acssuschemeng.0c04365
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发表时间：
2020-09-28
影响因子：
8.4
通讯作者：
Hallett, Jason P.
中科院分区：
文献类型：
--
作者：
Abouelela, Aida R.;Tan, Sze-yin;Hallett, Jason P.
消费后的废木是产生量最高但却被忽视的废流之一，通常被送往垃圾填埋场或危险的焚烧设施。这项研究介绍了使用离子溶剂法对真正的消费后被金属污染的废木作为可行的生物炼油厂原料的价态。废木的特征表明，来自防腐剂、油漆和颜料的重金属污染水平很高。对几种离子液体(ILS)进行了筛选，考察了几种离子液体(ILS)对废木进行分级的效果，包括木质素和半纤维素的脱除、葡聚糖的回收、酶糖化率以及从生物质中提取重金属的效果。在最佳条件下，1-甲基咪唑氯化物[H(1)CIM]ClIL对废木进行分级处理效果最好，可获得定量的葡萄糖产量，同时还能同时提取84-96%的重金属。考察了提高固相含量对前处理分馏效率和重金属萃取率的影响，当固液比为1：2g·g(-1)时，萃取率可达74~95%。在低过电位下也有铅的电沉积。这是第一个在生物精炼计划中将对生产者具有低至负价值的危险废木转化为附加值产品的例子。
Postconsumer waste wood is one of the most highly generated and yet overlooked waste streams that are typically sent to landfills or hazardous incineration facilities. This study presents the valorization of real postconsumer metal-contaminated waste wood as viable biorefinery feedstock using the ionoSolv process. Waste wood characterization showed high levels of heavy metal contamination originating from preservatives, paints, and pigments. Several ionic liquids (ILs) were screened to investigate their effectiveness in fractionating waste wood quantified by lignin and hemicellulose removal, glucan recovery, enzymatic saccharification yield, and their effectiveness in extracting the heavy metals from the biomass. 1-Methylimidazolium chloride [H(1)Cim]Cl IL was shown to be the most effective in fractionating the waste wood, achieving quantitative glucose yield, while simultaneously extracting 84-96% of heavy metals under optimum conditions. The effect of increasing the solid loading on pretreatment fractionation efficiency also was investigated, as well as on heavy metal extractions, with 74-95% extractions being achieved at solid to solvent loadings of 1:2 g g(-1). Electrodeposition of Pb was also demonstrated at low overpotentials. This is the first example of turning hazardous waste wood that has low to negative value to its producers into value-added products in a biorefinery scheme.