Cement kiln dust (CKD) and digestate for improving soil quality and crop yield and reducing greenhouse gas emissions

水泥窑粉尘 (CKD) 和消化物可改善土壤质量和作物产量并减少温室气体排放

• 批准号: 577602-2022
• 负责人: Chang, ScottSX
• 金额: $ 2.19万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=764505
• 关键词: Cement; kiln; dust; CKD; digestate

Industrial processes can produce a large quantity of by-products that are often treated as wastes. The disposal of such by-products in landfills can be costly and is environmentally unfriendly. Many industrial waste types can be recycled or beneficially used. Cement kiln dust (CKD) from the cement industry and digestate from the biogas production process are two such industrial by-products. The Canadian cement industry generates about 670,000 tonnes of CKD annually. The CKD contains nutrients such as calcium (Ca), magnesium and sulfur and is a material with an alkaline pH and can be used to neutralize the pH of acidic soils. The digestate has high soluble organic matter and nitrogen (N) content, and when it is applied to the soil, nitrous oxide emissions may increase. However, there has been no study on the soil fertility or agronomic benefits of the application of CKD alone or in combination with digestate in croplands in Canada. The research team will collaborate with the industrial partner (Norstar Industries Ltd) to develop a project to study the effect of CKD, digestate and a humic acid product on soil properties, greenhouse gas emissions, and crop yield and quality in a wheat-canola rotation in a Gray Luvisol that has low soil pH. Soil properties to be assessed include soil bulk density, total N, phosphorus (P) and potassium (K) contents, available NPK and Ca, pH and electrical conductivity, total carbon (C, both organic and inorganic, if any) and N, and the light fraction of organic C, and dissolved organic C and N. The effect of the treatments on extractable heavy metal contents in the soil and crop will also be assessed to evaluate the potential risk of heavy metal contamination. This four-year study will train one PhD student, two part-time postdoctoral fellows and four undergraduate research assistants. The research team and the partner organization will work together to disseminate the research findings to farmers across the country, in western Canada in particular, and provide policy input for the proper management of CKD and digestate.

工业生产过程会产生大量的副产品，这些产品往往被当作废物处理。在垃圾填埋场处理此类副产品成本高昂，而且对环境不友好。许多工业废物类型可以回收或有益地利用。水泥工业产生的水泥窑粉尘和沼气生产过程产生的沼气是两种这样的工业副产品。加拿大水泥行业每年产生约670，000吨水泥窑粉尘。CKD含有诸如钙（Ca）、镁和硫的营养素，并且是具有碱性pH的材料，并且可用于中和酸性土壤的pH。这种肥料具有较高的可溶性有机质和氮（N）含量，当它被施入土壤时，一氧化二氮的排放量可能会增加。然而，在加拿大的农田中，还没有关于单独施用CKD或与草甘膦结合施用的土壤肥力或农艺效益的研究。研究团队将与工业合作伙伴合作（Norstar Industries Ltd）开发一个项目，以研究CKD、磷酸盐和腐殖酸产品对土壤性质、温室气体排放以及具有低土壤pH值的灰淋溶土中小麦-油菜轮作中的作物产量和质量的影响。待评估的土壤性质包括土壤容重、总氮、磷（P）和钾（K）含量，可利用的NPK和Ca、pH和电导率、总碳（C，有机和无机的，如果有的话）和N、以及有机C的轻馏分、以及溶解的有机C和N。此外，还将评估处理对土壤和作物中可提取重金属含量的影响，以评估重金属污染的潜在风险。这项为期四年的研究将培养一名博士生，两名兼职博士后研究员和四名本科生研究助理。研究小组和伙伴组织将共同努力，向全国各地的农民，特别是加拿大西部的农民传播研究结果，并为适当管理CKD和干旱状态提供政策投入。