Table 5 Comparison of petroleum refinery wastewater treatments by various adsorbents.

From: Removal of hydrocarbon pollutants from refinery wastewater using N-hexadecylchitosan as an efficient adsorptive platform

Type of wastewater

Adsorbent

Efficiency

Local petroleum refinery in UAE43

Date-pit AC

COD% = 87

Tehran refinery wastewater44

AC

COD% = 78

Leading refinery in S. Oman45

AC

COD% = 79

Synthetic produced water46

Powdered AC

COD% = 95.87

Refinery wastewater (this article)

NHDC

COD% = 96

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