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  • Why is vegetable oil refinery wastewater a problem?
  • The treatment of vegetable oil refinery wastewaters has been a major problem of environmental concern in developing countries for the last decades due to their complex nature consisting of water and soluble and insoluble substances that contain fats and oil, carbohydrates, phenolic compounds, and suspended solids.
  • What is vegetable oil refining?
  • Crude vegetable oil obtained at these facilities is then transferred to a refining facility where it is prepared for human consumption or prepared for use in animal feeds. Refining of edible oil is a process where free fatty acids are volatilized, condensed, and recovered simultaneously with vacuum decoloring operation.
  • What is a vegetable oil?
  • Vegetable oils, or vegetable fats, are oils extracted from seeds or from other parts of edible plants. Like animal fats, vegetable fats are mixtures of triglycerides. Soybean oil, grape seed oil, and cocoa butter are examples of seed oils, or fats from seeds.
  • Are vegetable oil refinery wastewaters biodegradable?
  • The BOD 5 /COD ratios of the factory wastewaters are 0.15 and 0.2 for corn oil and sunflower oil refining wastewaters . Aslan et al. investigated the biodegradability of vegetable oil refinery wastewaters and concluded that they have a low BOD 5 /COD ratio and that these wastewaters cannot be treated only by biological treatment.