Effect of pyrolysis process on physical structure of biochar
Converting sewage sludge to biochar is one of the main ways to achieve sludge recycling.However,significant differences in the properties of biochar were observed due to different pyrolysis conditions.In this work,the preparation of biochar was investigated using low temperature pyrolysis of municipal sludge (moisture content 80％) with potassium acetate as an active agent.The aim of this study was to systematically investigate the effect of pyrolysis conditions,such as potassium acetate dosage,temperature,hold time,and heating rate of the sludge biochar.Because the addition of potassium acetate increased the activation ability of the sludge,the surface roughness and BET area of the biochar were increased.The results show that the most feasible conditions under which to produce adsorbents is the concentration of the potassium acetate dosage 4％,reaction temperature 350 ℃,reaction time 120 min,and heating rate of 3 ℃ · min-1 Under these conditions,the methylene blue adsorption number and BET area were 90.45 mg · g-1 and 31.402 m2 · g-1.
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维普
