Treating Wood Preserving Plant Wastewater by Chemical and Biological Methods.

摘要

A completely mixed activated sludge system was designed for a wood preserving plant with an average daily wastewater flow of 27,000 l/day (7,150gal/day), a BOD concentration of 1,100mg/l,and a phenol concentration of 120mg/l. Included in the design were capabilities for pre-and post-chlorination. The activated sludge system alone was capable of removing 90percent BOD, 75percent COD, 99percent phenol,and 76percent pentachlorophenol. Post chlorination dosages of over 50mg/l resulted in 50and 52percent reductions of phenol and pentachlorophenol,respectively. Laboratory pre-chlorination studies showed removal of phenol and pentachlorophenol at chlorine dosages in excess of 250mg/l.