Waste water from seafood handling setups can be very high in BOD (bio-chemical oxygen demand), FOG (Fat, oil and grease) & nitrogen content. Dissolved air flotation and flocculation is the key component of the sea food wastewater treatment plant. Sea food processing plants yield waste water holding a large amount of pollutants which are soluble, colloidal and in particulate forms. The amount of pollution depends on the process. Dissolved Air Flotation (DAF) is extremely prevalent waste water treatment process usedby a large number of industries such as petrochemical and chemical plants, papermills, refineries, hospitals, etc. This DAF technique is used in order to remove pollutants loads in the waste water before discharging it in the mainstreams. These pollutants can be termed as BOD, COD, fat oils, grease, chemicals, pharmaceuticals, suspended solids, etc. DAF water treatment removes pollutantsby clearing the water by eradicating suspended solids.
Some of the foremost benefits of DAF technology comprise- enhanced performance for eliminating lighter unit like- algae, which are hard to tackle. DAFcan normally attain lesser waste turbidity than settling, characteristically not morethan 0.5 NTU. It is not sensitive to temperature, particularly cold temperatures as isusual in settling. The start-up period is very small, roughly thirty minutes. Additional, DAF technology does not require producing substantial floc for settling. Therefore, lesser coagulant amount and smaller flocculation period can beused. The procedure can also function at greater SLR (surface loading rates) when compared to sedimentation, particularly in the high rated DAF methods, which can range up to 20 gpm per sqft. Actually in most of the industrial waste waters, the pollutants existing in seafood waste-waters are more and undefined mix of substances which are commonly organic in nature. This waste-water comprises substantial volume of insoluble suspended wastes, which can be removed from the waste stream by chemical and physical means. DAF is extensively used for waste water clarification. DAF technique has becomea conventional clarification procedure for water treatment plants, particularly where algae is prevailing, in addition to a common pre-treatment course forl waste water detoxification systems to battle pharmaceuticals and chemical existences all throughout the sphere.