Biological regeneration of powdered activated carbon added to activated sludge units

Novel biofiltration methods for the treatment of heavy metals from industrial wastewater

“…Adsorption and biodegradation performs simultaneously in biofilters to remove biodegradable and water soluble hazardous organic molecules, which results in simultaneous adsorption and biodegradation [18,19]. Though the mechanism of heavy metals removal by biofilter differs from that of the organic chemicals removal, but all the above conditions regarding growth of biomass in the biofilm are the same.…”

Some properties of a granular activated carbon-sequencing batch reactor (GAC-SBR) system for treatment of textile wastewater containing direct dyes

“…One advantage of using GAC in the SBR system is that the GAC acts as a medium for the bio-film to attach to, but will not adsorb the dyes on the surface. Therefore, the GAC can be used for a long time in the SBR system without any regeneration, and the GAC can be selfbio-regenerated during operation by the attached bio-film (Dewalle and Chain, 1977).…”

Application of Double-Dielectric Barrier Discharge Plasma for Removal of Pentachlorophenol from Wastewater Coupling with Activated Carbon Adsorption and Simultaneous Regeneration

“…Alternatively, the activated carbon could be reused after an appropriate regeneration step. A variety of methods for exhausted activated carbon regeneration have been reported [7][8][9][10][11][12], of which thermal regeneration and solvent regeneration are most widely used. The thermal regeneration requires that the temperature be kept above 1073 K and thus always suffers from the problem of high energy consumption and considerable carbon loss, while solvent extraction has bottlenecks of low regeneration efficiency due to part of the pores of the activated carbon being blocked [13,14] and necessary second disposal because adsorbed pollutants are only displaced by solvent molecules.…”