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Oilfield wastewater was obtained from the National Offshore Oil Corporation at Tianjin, China. This wastewater was skimmed before being used and determined. The wastewater was stored at 4 °C until required. The main characteristics of sample wastewater are listed in Table 1. As shown, the oilfield wastewater had high concentrations of COD, total dissolved solids and suspended solids (SS). Moreover, the oilfield wastewater had high color.

Table 1

Characteristics of the raw oilfield wastewater

ParameterUnitValue
pH 6.7 
COD mg/L 3,386 
BOD5 mg/L 631 
BOD5/COD 0.186 
Total dissolved solids mg/L 6,150 
SS mg/L 40.38 
Color 175 
Guar gum mg/L 3,297–3,516 
Alkalinity mg/L 5,126 
Oil and grease mg/L 37 
Total petroleum hydrocarbon mg/L 34 
ParameterUnitValue
pH 6.7 
COD mg/L 3,386 
BOD5 mg/L 631 
BOD5/COD 0.186 
Total dissolved solids mg/L 6,150 
SS mg/L 40.38 
Color 175 
Guar gum mg/L 3,297–3,516 
Alkalinity mg/L 5,126 
Oil and grease mg/L 37 
Total petroleum hydrocarbon mg/L 34 

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