Preparation of sludge absorbent from sewage sludge by microwave-induced pyrolysis

In order to achieve the resources of sludge,the sludge adsorbent was made by microwave-induced pyrolysis.The impact of microwave power,quantity of activated carbon,radiation time on the sludge adsorbent sorption was investigated by the analysis of iodine value and SEM,and the treatment of simulated dying wastewater.Through experiment,the best technology conditions on preparation for sludge absorbent are obtained: microwave power is 400 W,the quantity of activated carbon is 0.25%,radiation time is 8 min.The maximal iodine value of the sludge absorbent is 303.73 mg/L and the average pore diameter is 2.88 nm.The volumes of total pore,mesopore and micropore are 0.422 mL/g,0.203 mL/g,0.150 mL/g and the surface area is 308.1 m2/g.This absorbent was used to treat Argazol Blue(BF-BR) and Fuchsin Basic simulated dying wastewater,and the color removal exceeded 75% and 95% respectively.The technology of sludge adsorbent by microwave-induced pyrolysis is feasible and has good application prospects.