Originally, the Unicell dissolved air clarifier was developed at the end of the sixties and the beginning of the seventies. Like most of the products of the company, it was used for clarification mainly in the paper industry. The Unicell design was designed for big water flows and a concrete tank construction. In the early 2000’s, the Unicell concept was adapted to small units with stainless steel tanks to be used in the food industry for heavy oil and grease removal. The clarified water extraction was simplified (the bottom clarified water recovery pipes disappeared) and the surface scraper was complemented by a paddle wheel to improve the floated sludge removal capacity.
By the middle of the decade the market demand for large sea water and fresh water DAF clarifiers increased significantly. This led KWI to combine the historical and recent experience with the Unicell design and develop the Unicell BF (like Big Flow) concept. The purpose of this new concept was to offer design flexibility and possibilities to be adapted to fresh or sea water, to high or low suspended solids content, to inbuilt or external flocculation tanks, to single or modular installations.