Ecological remediation of urban legacy pollution: Developing a neosoil for marginal brownfield bioremediation

城市遗留污染的生态修复：开发用于边缘棕地生物修复的新土壤

• 批准号: 2876941
• 金额: --
• 依托单位: University of Birmingham
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2876941
• 关键词: Ecological; remediation; urban; legacy; pollution

Canals are increasingly valued as an important green space providing recreational and ecological benefit in urban areas (Williams et al.,2010). However, their industrial past has left a legacy of polluted soils and sediments with associated poor water quality. As a result, large sections of the UK's canal network require significant remediation of heavy metals before being suitable for public use. The principal method of clean-up requires excavation and ex-situ remediation (Bromhead et al.,1994). This is often too costly for marginal public land and therefore an alternative, in-situ, low-cost method is needed to bring these areas back into beneficial use. Recent advances in composting technology offer an opportunity to improve the environmental sustainability of in-situ bioremediation (Zhou et al.,2022). Natural chelating agents such as amino acids (Dolev et al.,2020) and other low-molecular-weight organic acids (Wang et al,.2019) provide promising new ways to improve remediation efficiency without the negative impacts on soil function and structure afforded by synthetic, non-biodegradable chelators such as EDTA (Jelusic and Lista 2014; Bloem et al.,1917). Similarly, plants with root exudates high in oxalic, galactonic and glyceric acid have been shown to effectively remove lead in contaminated soil (Luo et al,.2017). Most research into heavy metal remediation is focused on a single or limited number of contaminants. However, this does not reflect in-situ legacy contamination where multiple contaminants are usually present at an individual site. For example, the Grand Union canal in Digbeth, Birmingham has nine heavy metal concentrations in excess of regulatory values (Fig.1). The novelty of this project is to focus on multi-contaminant removal via production of a low-cost "neosoil" that can be utilised at similarly contaminated sites in the UK. The project's principal aim is to bring contaminated urban marginal land back into public use. Accordingly, the project will: (1) identify the best combination of soil amendments (e.g. natural/chelate/organic) for bio- and phytoremediation of heavy metal contaminants in soils; (2) examine potential negative consequences of remediation including increased mobility via changes in soil chemistry, leaching and partitioning into aboveground biomass; (3) create a neosoil template for low-cost remediation of similarly contaminated sites within the UK.

运河作为在城市地区提供休闲和生态效益的重要绿色空间而日益受到重视（Williams 等，2010）。然而，他们的工业历史留下了受污染的土壤和沉积物以及相关的不良水质的遗产。因此，英国运河网络的大部分区域在适合公众使用之前需要进行大量的重金属修复。主要的清理方法需要挖掘和异地修复（Bromhead 等，1994）。对于边际公共土地来说，这往往成本太高，因此需要一种替代的、就地的、低成本的方法来使这些区域重新得到有益的利用。堆肥技术的最新进展为提高原位生物修复的环境可持续性提供了机会（Zhou et al.,2022）。氨基酸（Dolev 等人，2020）和其他低分子量有机酸（Wang 等人，2019）等天然螯合剂提供了有前途的新方法来提高修复效率，而不会对土壤功能和结构产生负面影响通过合成的、不可生物降解的螯合剂，例如 EDTA（Jelusic 和 Lista 2014；Bloem 等，1917）。同样，根部分泌物富含草酸、半乳糖和甘油酸的植物已被证明可以有效去除污染土壤中的铅（Luo 等人，2017）。大多数重金属修复研究都集中在单一或有限数量的污染物上。然而，这并不反映原位遗留污染，在原位遗留污染中，单个地点通常存在多种污染物。例如，伯明翰迪格贝斯的大联盟运河有九种重金属浓度超出监管值（图1）。该项目的新颖之处在于通过生产低成本的“新土”来去除多种污染物，该“新土”可用于英国类似的污染场地。该项目的主要目标是将受污染的城市边际土地重新投入公共使用。因此，该项目将：（1）确定土壤改良剂（例如天然/螯合物/有机）的最佳组合，用于土壤中重金属污染物的生物和植物修复； (2) 检查修复的潜在负面影响，包括通过改变土壤化学、浸出和分配到地上生物量来增加流动性； (3) 创建新土壤模板，用于对英国境内类似污染场地进行低成本修复。