* Water Pollution Research department, National Research Centre, Cairo, Egypt
**Faculty of Engineering, Cairo University, Cairo, Egypt
Abstract
Treatment of chemical industrial wastewater from building and
construction chemicals factory and plastic shoes manufacturing factory
was investigated. The two factories discharge their wastewater into the
public sewerage network. The results showed the wastewater discharged
from the building and construction chemicals factory was highly
contaminated with organic compounds. The average values of COD and
BOD were 2912 and 150 mgO2/l. Phenol concentration up to 0.3 mg/l
was detected. Chemical treatment using lime aided with ferric chloride
proved to be effective and produced an effluent characteristics in
compliance with Egyptian permissible limits. With respect to the other
factory, industrial wastewater was mixed with domestic wastewater in
order to lower the organic load. The COD, BOD values after mixing
reached 5239 and 2615 mgO2/l. The average concentration of phenol was
0.5 mg/l. Biological treatment using activated sludge or rotating
biological contactor (RBC) proved to be an effective treatment system in
terms of producing an effluent characteristic within the permissible limits
set by the law.