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 [H₁Cim]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.

中文翻译：

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迈向循环经济：使用ionoSolv工艺对消费后废木材进行净化和估价

消费后的废木料是产生量最高但仍被忽略的废料流之一，通常将其送往垃圾填埋场或危险的焚烧设施。这项研究提出了使用ionoSolv工艺对消费后金属污染的废木材作为可行的生物精炼原料的价值评估。废木材的表征表明，高水平的重金属污染源于防腐剂，油漆和颜料。筛选了几种离子液体（IL），以研究其在通过木质素和半纤维素去除，葡聚糖回收，酶促糖化收率定量化的废木材分离中的功效，以及它们在从生物质中提取重金属的功效。1-甲基咪唑氯化物[H ₁Cim] Cl IL被证明是最有效的分离废木料，实现定量葡萄糖产量的同时，在最佳条件下同时提取84-96％的重金属。还研究了增加固体载量对预处理分馏效率以及重金属萃取的影响，当固体与溶剂的载量为1：2 gg ^–1时，萃取率达到74–95％。在低的超电势下也证明了Pb的电沉积。这是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增值产品的第一个示例。