Incorporation of Mg-modified zeolite in municipal solid waste compost reduces heavy metal concentration in soil and corn plant
The research paper investigates the impact of incorporating magnesium-modified zeolite (CMZ) into municipal solid waste (MSW) compost to mitigate heavy metal contamination in soil and corn plants. Heavy metals such as lead (Pb), copper (Cu), manganese (Mn), zinc (Zn), nickel (Ni), and cadmium (Cd) can accumulate in compost and subsequently contaminate soil and crops if not managed properly. The study involved a greenhouse experiment where different rates (5%, 10%, and 15%) of natural zeolite (CNZ) and Mg-modified zeolite (CMZ) were added to MSW compost.
Results indicated that the application of both types of zeolite significantly reduced the concentration of heavy metals in the compost and soil. Specifically, the DTPA-extractable concentrations of heavy metals in matured compost decreased by 13% to 47% with natural zeolite and 14% to 47% with Mg-modified zeolite compared to zeolite-free compost. In terms of corn plant uptake, the CMZ treatments showed a reduction of heavy metal concentrations in roots, stalks, and leaves by up to 62% compared to the control. The bioaccumulation factors (BAFs) for Pb, Cu, Mn, and Ni were also significantly lower in plants grown in zeolite-amended soils, indicating reduced translocation of these metals from roots to aerial parts.
The study concluded that the use of zeolite, particularly in its Mg-modified form, effectively stabilizes heavy metals in compost, thereby enhancing plant biomass and reducing the risk of heavy metal accumulation in the food chain.
This research paper is significant in the field of environmental science and agricultural sustainability as it addresses the critical issue of heavy metal contamination in soils and crops, which poses risks to human health and the environment. By demonstrating the effectiveness of Mg-modified zeolite in reducing heavy metal concentrations, the study contributes to ongoing discussions about sustainable waste management practices and soil remediation techniques. The findings offer practical benefits for farmers and agricultural practitioners by providing a method to enhance compost quality and safety, ultimately leading to healthier crops and reduced environmental impact.
