Improved treatment of tannery wastewater using Zoogloea ramigera and its extracellular polymer in an activated sludge process

Abstract

When Zoogloea ramigera and its extracellular polymer were daily added to the laboratory scale activated sludge reactor treating tannery wastewater, more than 15% of the COD concentration (COD; 151 mg/l) and 32% of the turbidity (NTU; 9.2) were removed compared with a controlled reactor (COD; 336 mg/l, NTU; 43.5) operated without any additions.