Treatment of slightly polluted wastewater in an oil refinery using a biological aerated filter process
The slightly polluted wastewater from oil refinery contains some COD, oil pollutants and suspended solids (SS). A small-scale
fixed film biological aerated filter (BAF) process was used to treat the wastewater. The influences of hydraulic retention
time (HRT), air/water volume flow ratio and backwashing cycle on treatment efficiencies were investigated. The wastewater
was treated by the BAF process under optimal conditions: the HRT of 1.0 h, the air/water volume flow ratio of about 5:1 and
the backwashing cycle of every 4–7 days. The results showed that the average removal efficiency of COD, oil pollutants and
SS was 84.5%, 94.0% and 83.4%, respectively. And the average effluent concentration of COD, oil pollutants and SS was 12.5,
0.27, 14.5 mg·L−1, respectively. The experimental results demonstrated that the BAF process is a suitable and highly efficient method to treat
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ABSTRACT: Oily wastewater poses significant threats to the soil, water, air and human beings because of the hazardous nature of its oil contents. The objective of this review paper is to highlight the current and recently developed methods for oily wastewater treatment through which contaminants such as oil, fats, grease, and inorganics can be removed for safe applications. These include electrochemical treatment, membrane filtration, biological treatment, hybrid technologies, use of biosurfactants, treatment via vacuum ultraviolet radiation, and destabilization of emulsions through the use of zeolites and other natural minerals. This review encompasses innovative and novel approaches to oily wastewater treatment and provides scientific background for future work that will be aimed at reducing the adverse impact of the discharge of oily wastewater into the environment. The current challenges affecting the optimal performance of oily wastewater treatment methods and opportunities for future research development in this field are also discussed.
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