Effects of cement kiln dust on soil nitrogen and metal bioavailability

Rapid urbanization has resulted in increased cement production and use, generating waste like cement kiln dust (CKD) and greenhouse gases. CKD, often landfilled, is now used as a soil amendment for its alkaline properties to counter soil acidification. When CKD is applied to the soil, it alters soil pH, affecting nutrient availability (e.g., nitrogen (N), phosphorus), N2O emissions, and heavy metal bioavailability. Limited knowledge of the influence of CKD on soil carbon mineralization, nitrogen availability, greenhouse gas emissions, and heavy metal bioavailability hinders its widespread use. Co-applying CKD with organic amendments, such as humic acid, is recommended to enhance soil fertility and crop yields. This project will investigate their combined effects on carbon mineralization, nitrogen availability, N2O emissions, and heavy metal bioavailability, aiming to provide insights into improving soil health while mitigating environmental risks and heavy metal release. The partner organization, Norstar, is focused on sustainable waste management, environmental stewardship, and improving soil health by repurposing industrial byproducts like CKD. Norstar’s main activities include researching and developing eco-friendly uses for CKD, particularly in agriculture, to enhance soil quality while managing industrial waste responsibly. This project will contribute to global sustainable environmental management objectives.

Faculty Supervisor:

Scott Chang

Student:

Partner:

Norstar

Discipline:

Earth science

Sector:

Agriculture; Wholesale trade

University:

University of Alberta

Program: