A fish flour and fish oil processing company produces 100 tons of flour a day from fish waste resulting from the broth concentration plant and from drying of flour, washing water, boiler blowdown and cooling towers. The company needed to treat its wastewater and to reduce its water supply costs. Adding to its challenge was location, as the area lacks water, both for drinking and for irrigation purposes. The little water available is also rich in salts that makes boiler blowdown very expensive.
Additionally, the reuse of wastewater from the fish processing industry is particularly complicated as the effluents are very difficult to treat. Yet another challenge was to purify the water to a level sufficient to be demineralized and reused through a reverse osmosis system.