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.

工业过程会产生大量副产品，这些副产品通常被当作废物处理。在垃圾填埋场处置此类副产品可能成本高昂且对环境不利。许多工业废物类型都可以回收或有益利用。水泥工业产生的水泥窑粉尘 (CKD) 和沼气生产过程产生的沼渣就是两种这样的工业副产品。加拿大水泥行业每年产生约 67 万吨 CKD。 CKD含有钙（Ca）、镁和硫等营养物质，是一种具有碱性pH值的材料，可用于中和酸性土壤的pH值。消化物具有较高的可溶性有机物和氮（N）含量，当其施用于土壤时，一氧化二氮的排放量可能会增加。然而，目前还没有关于加拿大农田单独施用 CKD 或与沼渣沼渣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（Norstar Industries Ltd）合作开发一个项目，研究 CKD、沼渣和腐植酸产品对小麦-油菜轮作中土壤特性、温室气体排放以及作物产量和质量的影响土壤 pH 值较低的灰色 Luvisol 中。要评估的土壤特性包括土壤容重、总氮、磷 (P) 和钾 (K) 含量、有效 NPK 和 Ca、pH 和电导率、总碳（C，有机碳和无机碳，如果有）和 N，还将评估处理对土壤和作物中可萃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、两名兼职博士后和四名本科生研究助理。研究团队和合作伙伴组织将共同努力，向全国各地的农民传播研究成果，特别是加拿大西部的农民，并为 CKD 和沼渣的正确管理提供政策投入。