Stabilization of Sewage Sludge Using Cow Dung, Poultry Manure and Horse Dung by Vermicomposting
Journal Title: International Journal of engineering Research and Applications - Year 2018, Vol 8, Issue 5
Abstract
Toxic concentrations of heavy metals have been reported to be present in STPs as many industries dispose their waste directly in domestic sewers without prior treatment and thus they are carried to the sludge generated during the treatment processes. This study used one such technique of vermi composting for stabilizing the toxic sludge. The work aimed at reducing the heavy metal content (Cr, Cd, Ni and Pb) from aerobic sewage sludge by the vermicomposting method using earthworm Eiseniafoetida with the different activators (Cow Dung, Poultry Manure and Horse Dung) at 50:50 proportion by mass for 105-day period. The results showed that both cow dung and poultry manure are commensurable for causing the decomposition of the sewage sludge and were better than horse dung. And for stabilizing the heavy metals, cow dung acted as the best activator. The lab analysis depicted high values of chromium which made it the main toxic element that needed removal. The study further showed that there are high heavy metal contents in the activator themselves which contribute to the high values in the pit material at the initial stages but still considering their stabilization effect they are added. The sewage sludge waste in case of heavy metals, cow dung acts as the best stabilization material.
Authors and Affiliations
Gurung Sonakshi, Jain Kashish
Keywords
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