Northern Analytical Laboratory Services, University of Northern British Columbia, 3333 University Way, Prince George, B.C., V2N 4Z9, Canada.
Chemistry Program, University of Northern British Columbia, 3333 University Way, Prince George, B.C., V2N 4Z9, Canada.
Waste Manag. 2021 Feb 15;121:186-197. doi: 10.1016/j.wasman.2020.12.014. Epub 2020 Dec 25.
Biomass ashes are potential soil amendments that reduce soil acidity and provide plant nutrients, but trace elements in ash may be leached from the solid phase, thereby posing environmental concerns. We determined the leachability of selected major elements, trace elements and anions from wood derived bottom ash generated from an updraft gasifier as influenced by ash pretreatments and the presence of soil via serial aqueous batch extraction. We found that self-hardening reduced initial solubility and reactivity of ash (i.e. lowered electrical conductivity), and reduced initial aqueous concentrations of Ba, Ca, Cu, Fe, Hg, Pb, Sr and Zn. But, hardening of ash increased initial aqueous concentrations of B, Cr, P, Se and SO. Although mixing ash into soil (5% ash by mass) generally decreased the mobility of most constituents, aqueous concentrations of P and As were increased relative to that of either ash-alone or soil-alone treatments. Overall, extract concentrations of constituents in various treatments were relatively low. Results of this serial batch extraction support the use of clean wood-derived bottom ash as a safe and environmentally suitable soil amendment.
生物质灰是一种潜在的土壤改良剂，可降低土壤酸度并提供植物养分，但灰分中的微量元素可能会从固相中浸出，从而引起环境问题。我们通过连续的水相批量提取，确定了源自上吸式气化炉的木质底灰中选定的主要元素、微量元素和阴离子的浸出率，这些浸出率受灰分预处理和土壤存在的影响。我们发现自硬化工序降低了灰分的初始溶解度和反应性（即降低电导率），并降低了 Ba、Ca、Cu、Fe、Hg、Pb、Sr 和 Zn 的初始水相浓度。但是，灰分的硬化增加了 B、Cr、P、Se 和 SO 的初始水相浓度。尽管将灰分混入土壤中（按质量计为 5%）通常会降低大多数成分的迁移性，但与灰分单独或土壤单独处理相比，P 和 As 的水相浓度增加。总体而言，各种处理中成分的提取浓度相对较低。这项连续批量提取的结果支持将清洁的木质底灰用作安全且环境适宜的土壤改良剂。
