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The present project was aimed at studying the effects of increasing loading of heavy metals on the anaerobic digestion of sewage sludge. The first experiment indicated that a sludge sample collected from Taipo Sewage Treatment Plant had a higher gas yield than one from Shatin Sewage Treatment Plant, which was possibly due to the higher content of heavy metals, including Cr, Cu, Ni and Zn, in Shatin...
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