Remediation of Cement Kiln Dust (CKD)-contaminated sites using excretory halophytes: Quantification, optimization and modelling of salt extraction and dispersion

利用排泄性盐生植物修复水泥窑粉尘 (CKD) 污染场地：盐提取和分散的量化、优化和建模

• 批准号: 504080-2016
• 负责人: Zeeb, Barbara
• 金额: $ 2.19万
• 依托单位: Royal Military College of Canada
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=618207
• 关键词: Remediation; Cement; Kiln; Dust; CKD

Soil salinization can occur due to industrial spills, the application of road salt, and the landfilling of high salt content industrial waste materials. Regardless of the mode of contamination, soil salinization is a growing problem both in Canada, where it is estimated that >7.2 million ha of soil are affected, and word wide. Soil salinization leads to the degradation of soil, reduces microbial activity, and diminishes plant growth. It can also lead to ground and surface water contamination. Common remediation strategies for salt-impacted soils including the application of chemical amendments, landfilling, and capping are typically very expensive, energy intensive, and destroy the soil matrix. The use of vascular plants to clean up contaminated sites (i.e. phytotechnology) is a low cost alternative to conventional remediation strategies, but has to date, not been exploited in salt-impacted soils. In this proposal, we employ salt-tolerant plants, known as halophytes, to take up salt ions from contaminated soil and either sequester them in the plant tissue, or excrete them through specialized salt glands. When salts are excreted on stem and leaf surfaces, they can theoretically be dispersed on the wind and redistributed across a large area. The theoretical dispersal of salt in this manner is referred to as 'haloconduction' in the scientific literature, but has never been demonstrated in laboratory or field trials. We propose to measure the dispersal of excreted salts using a variety of different techniques both at an industrial field site, and in the laboratory. This information will then be used to create a model of salt dispersion. Given that common salt ions such as K+ and Cl- are plant and animal nutrients, their dispersal over a wide area could actually benefit the environment. This research is important as it addresses the known and growing problem of soil salinization in Canada using a 'green technology'. Using plants to clean up salt-impacted soils improves the appearance of contaminated sites, decreases our reliance on more energy-intensive technologies, and reduces the amount of contaminated material going to landfills. Our results will provide site owners with a remediation strategy that is both 'environmentally friendly' and cost-effective.

由于工业泄漏，道路盐的应用以及高盐分含量工业废料的垃圾填埋，可能会发生土壤盐水。无论污染方式如何，在加拿大，土壤盐化都是一个日益严重的问题，据估计，土壤的720万公顷受到影响，而且宽广。土壤盐水导致土壤降解，减少微生物活性并减少植物的生长。它也可能导致地面和地表水污染。针对盐侵入的土壤的共同补救策略，包括应用化学修正案，垃圾填充和封盖通常非常昂贵，能源密集并破坏土壤基质。使用血管植物清理受污染的地点（即植物技术）是常规补救策略的低成本替代品，但迄今为止，尚未在盐含量的土壤中利用。在此提案中，我们采用耐盐植物（称为盐植物）从受污染的土壤中吸收盐离子，然后将其隔离在植物组织中，或者通过专门的盐腺体排泄。当盐在茎和叶片表面上排出时，理论上可以分散在风中并重新分布在大面积区域。在科学文献中，以这种方式的盐理论扩散被称为“孤岛传导”，但在实验室或现场试验中从未证明。我们建议在工业野外和实验室中使用各种不同技术来测量排泄盐的分散。然后，将使用此信息来创建盐分散模型。鉴于诸如K+和Cl-的常见盐离子是植物和动物营养素，因此它们在广泛区域的分散实际上可能使环境受益。这项研究很重要，因为它使用“绿色技术”解决了加拿大已知的越来越多的土壤盐化问题。使用植物清理盐侵入的土壤可改善受污染地点的出现，减少我们对更多能源密集型技术的依赖，并减少垃圾填埋场的受污染材料的量。我们的结果将为现场所有者提供“环保友好”又具有成本效益的补救策略。