Preparation of Sludge-based Activated Carbon and Adsorptive Properties of Methylene Blue

Sludge activated carbon was prepared from municipal wastewater treatment plant sludge by microwave heating and chemical activation with phosphoric acid( H3PO4) as an activation reagent,which was used for the adsorption of dye( methylene blue). The influences of the adsorbent amount,adsorption time,adsorption temperature and p H value on adsorption effect were investigated. The adsorption kinetics was also discussed. At a methylene blue concentration of 58 mg / L,adsorption time of 59 min,adsorption temperature of 35 ℃ and adsorption dosage of 0. 26 g,the extent of methylene blue removal was up to 94%. The adsorption isotherm of methylene blue on the sludge activated carbon corresponds to the form of Langmuir isotherm.