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Low-temperature thermo-alkaline pretreatment of waste activated sludge (WAS) was studied, within the region of 0–0.2M NaOH and 60–90°C, for the effects of NaOH concentration and temperature on sludge degradability in anaerobic digestion (AD). Significant disintegration of sludge solids (up to 75.6%) and an increase in methane production (up to 70.6%) were observed in the pretreatment trials. Two quadratic...
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