This report consists of lab scale experiments and amendment studies of biosolids from Mangere Wastewater Treatment Plant, Auckland New Zealand. The physiochemical parameters of interest in this study were lipids, proteins, carbohydrates, total carbon (TC), inorganic carbon (IC), pH and dry solid contents.In the first stage, this study was carried out to develop protocols for the accurate assessment of the selected physiochemical parameter in biosolids then; this study was further extended by planning various sets of experimental runs to study the temporal trends in biosolids. In one set of...