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Title	Unlocking the nutrient value of sewage sludge
ID_Doc	25741
Authors	Singh, V; Phuleria, HC; Chandel, MK
Title	Unlocking the nutrient value of sewage sludge
Year	2022
Published	Water And Environment Journal, 36, 2
Abstract	This study characterises the sewage sludge from 26 sewage treatment plants in India, which demonstrates the nutrient potential and highlights the associated challenges in using the sludge. The dry sludge had 2.35%-4.2% N, 2.46-3.2% phosphorus (P2O5) and 0.83%-1.24% potassium oxide (K2O), whereas sludge ash contains similar to 13.6% and 2.7%, P2O5 and K2O, respectively. Total nutrient potential from the sludge of the existing sewage treatment facility was 97.5 x 10(3) tonne/year, which is equivalent to 0.92% urea or 0.19% NPK used presently as conventional fertilisers in India. However, pre-treatment may be required for this sludge before using it in agricultural fields as heavy metals, such as Zn, Cu, Ni, Cd, and Cr, were found higher than the compost standards. This study would be useful for the researchers and policymakers globally and would motivate them to make policies and deploy suitable technologies towards the nutrient utilisation from sewage sludge.
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