title: Preparation of activated carbon from wet sludge by electrochemical-NaClO activation.
abstract: Activated carbon (AC) from sludge is one potential solution for sewage sludge disposal, while the drying sludge is cost and time consuming for preparation. AC preparation from the wet sludge with electrochemical-NaClO activation was studied in this work. Three pretreatment processes, i.e. chemical activation, electrolysis and electrochemical-reagent reaction, were introduced to improve the sludge-derived AC properties, and the optimum dosage of reagent was tested from the 0.1:1 to 1:1 (mass rate, reagent:dried sludge). It was shown that the electrochemical-NaClO preparation is the best method under the test conditions, in which AC has the maximum Brunauer, Emmett and Teller area of 436 m²/g at a mass ratio of 0.7. Extracellular polymeric substances in sludge can be disintegrated by electrochemical-NaClO pretreatment, with a disintegration degree of more than 45%. The percentage of carbon decreased from 34.16 to 8.81 after treated by electrochemical-NaClO activation. Fourier transform infrared spectra showed that a strong C-Cl stretching was formed in electrochemical-NaClO prepared AC. The maximum adsorption capacity of AC reaches 109 mg/g on MB adsorption experiment at pH 10 and can be repeated for three times with high removal efficiency after regeneration.
authors.affiliation: a School of Environmental Science and Engineering , Shanghai Jiao Tong University , Shanghai 200240 , People's Republic of China.
authors.forename: Chen
authors.initials: C
authors.lastname: Miao
authors.forename: Caihong
authors.initials: C
authors.lastname: Ye
authors.forename: Tianxing
authors.initials: T
authors.lastname: Zhu
authors.forename: Ziyang
authors.initials: Z
authors.lastname: Lou
authors.forename: Haiping
authors.initials: H
authors.lastname: Yuan
authors.forename: Nanwen
authors.initials: N
authors.lastname: Zhu
mesh_terms: D000327:Adsorption; D001704:Biopolymers / Q000737:chemistry; D002244:Carbon / Q000737:chemistry*; D004563:Electrochemistry; D008751:Methylene Blue / Q000737:chemistry; D016062:Porosity; D011189:Potassium Chloride / Q000737:chemistry; D012722:Sewage / Q000737:chemistry*; D012973:Sodium Hypochlorite / Q000737:chemistry*; D013499:Surface Properties; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D001704:Biopolymers; D012722:Sewage; D014874:Water Pollutants, Chemical; D011189:Potassium Chloride; D002244:Carbon; D012973:Sodium Hypochlorite; D008751:Methylene Blue
keywords: EPS; activated carbon; adsorption capacity; electrochemical activation; wet sludge