Effect of phenolic tar on the work of activated sludge.

The effect of different phenolic tar concentrations on the work of activated sludge in petrochemical and synthetic wastewater was investigated. The concentrations of 440 and 300 mg/l of phenolic tar did not show a destructive effect on the activated sludge and its work. The highest concentration of phenolic tar (880 mg/l) reduced the efficiency of purification and changed the structure of the activated sludge.