Lettuce Response to Enhanced Struvite Recovered from Faecal Sludge Effluent and the Probabilistic Health Risk Assessment of Heavy Metals Through the Intake of the Lettuce

Isaac Enyemadze, Sampson Oduro-Kwarteng, Helen Essandoh, Francis W. Y. Momade, Eli A. Gaveh and Benson K. Asamoah
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Isaac Enyemadze: Department of Civil Engineering, Regional Water and Environmental Sanitation Center Kumasi (RWESCK), Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
Sampson Oduro-Kwarteng: Department of Civil Engineering, Regional Water and Environmental Sanitation Center Kumasi (RWESCK), Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
Helen Essandoh: Department of Civil Engineering, Regional Water and Environmental Sanitation Center Kumasi (RWESCK), Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
Francis W. Y. Momade: Department of Material Engineering, College of Engineering, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
Eli A. Gaveh: Department of Horticulture, College of Agriculture and Natural Resources, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
Benson K. Asamoah: Department of Horticulture, College of Agriculture and Natural Resources, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana

International Journal of Research and Innovation in Applied Science, 2024, vol. 9, issue 3, 317-335

Abstract: Precipitating magnesium ammonium phosphate (MAP) to include potassium (K) has been explored to improve the fertilizing ability of the product. The present study aims to precipitate a MAP that also contains K and determine the probable risk to human health through the daily consumption of lettuce cultivated with the enhanced struvite. Analysis of the precipitate revealed that adding cocoa bean husk as seed produced MAP with potassium (K) content. The concentration of the heavy metals in the fresh leaves (concentration range, safe limits in mg/kg) was Cu (6.14 – 12.13, 73.3), Cd (0.11 – 0.43, 0.2), Ni (0.44 – 0.85, 67.9), Pb (0.85 – 1.38, 0.3). The estimated daily intake of heavy metals via the consumption of lettuce grown with struvite was below the tolerable upper dietary intake levels. The 95th percentile of the hazard index for the control, NPK and struvite are 0.047, 0.605, (0.214 – 0.759) respectively. The struvite produced can significantly improve its performance as an alternate phosphorus fertilizer and also show if struvite is safe for use as a fertilizer.

Date: 2024
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