Table 37-2 Typical removal efficiencies for oil refinery treatment processes.


 

Removal Efficiency, %

Process Process Influent BOD COD TOC SS Oil Phenol Ammonia Sulfide
API Separator raw waste 5-40 5-30 NA 10-50 60-99 0-50 NA NA
Primary clarifier API effluent 30-60 20-50 NA 50-80 60-95 0-50 NA NA
Dissolved air flotation separator effluent 20-70 10-60 NA 80-85 70-85 10-75 NA NA
Filter API effluent 40-70 20-55 NA 75-95 65-90 5-20 NA NA
Secondary oxidation pond API effluent 40-95 30-65 60 20-70 50-90 60-99 0-15 70-100
Aerated lagoon primary effluent 75-95 60-85 NA 40-65 70-90 90-99 10-45 95-100
Activated sludge primary effluent 80-99 50-95 40-90 60-85 80-99 95-99 33-99 97-100
Trickling filter API effluent 60-85 30-70 NA 60-85 50-80 70-98 15-90 70-100
Cooling tower primary effluent 50-95 40-90 10-70 50-85 60-75 75-99+ 60-95 NA
Activated carbon primary effluent 70-95 70-90 50-80 60-90 75-95 90-100 7-33 NA
Tertiary filter granular media secondary effluent NA NA 50-65 75-95 65-95 5-20 NA NA
Activated carbon secondary + 
filter effluent
91-98 86-94 50-80 60-90 70-95 90-99 33-87 NA