Abstract
The enrichment of nitrogen and phosphorus in sewage poses a significant risk of resource loss if not effectively recovered and utilized. This study investigates the sustainable management and conservation of these vital nutrients through the recycling of saturated Mg-loaded adsorbents as soil additives for mint (Mentha spicata) cultivation. The effects of recycled waste adsorbents were compared with new adsorbents, commercial compound fertilizers, and struvite, using a control check (CK) to assess their impact on soil nutrient content and plant growth parameters. Results showed that waste adsorbents significantly enhanced soil nutrient content compared to CK. Although nutrient levels in the first 30 days were lower than with commercial fertilizers, a reversal was noted between 30 and 60 days, indicating a slower nutrient release rate. Furthermore, the germination rate and leaf width of mint increased by 13.34 % and 25.38 %, respectively. Significant improvements in plant height, fresh weight, and dry weight demonstrated positive effects on growth. This study confirms the feasibility of recycling waste Mg-loaded adsorbents for the sustainable reutilization of nitrogen and phosphorus resources from wastewater, contributing to enhanced soil health and sustainable agricultural practices.
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