2.4. Evaluation condition
The oil-water separation treated in this research was to separate oil from oil-mixed wastewater using oil-water
separation equipment, to reuse the recovered oil as resource and to reduce the work load of downstream wastewater
treatment (Noguchi et al., 2011; Otsuka et al., 2013). Recovered oil including less water and other contaminant has a
positive value as food within the food processing factory fully-equipped sanitary facilities. Wastewater excluded oil
and other contaminant has a positive value as non-drinking water. On the other hand, the more increase the portion
of water and other contaminant in the recovered oil, the less value as energy resource of food the recovered oil gain.
And, the more increase the portion of oil in the separated water, the less value of the water gain owing to the
increase of the work load for water purification by wastewater treatment facilities. In contrast to general separation
which produce products and wastes from feedstock, oil-water separation produce two different products, oil and
water from feedstock