1. Standard Methods for the Examination of Water and Wastewater;APHA,1981
2. Heavy metals uptake by activated sludge;Cheng;J. Wat. Pollut. Control Fed.,1975
3. Finding a home for the carbon: aerator (powdered) or column (granular);Flynn,1976
4. The use of powdered activated carbon in the activated sludge process; a technical and economic assessment;Frost;Tech. Rep. TR-Water Res. Cent.,1979
5. Powdered carbon improves activated sludge treatment;Grieves,1977