| abstract |
A process and a plant for purifying agricultural waste liquid such as waste liquid from the processing of fruit, wherein the waste material initially is separated into a solid and water-soluble phase and where the aqueous phase further is provided with chitosan to flocculate the colloidally floating particles in the aqueous phase. The thus treated aqueous phase is passed through a pipe flocculator (2) and is subsequently treated by further adding of chitosan (4, 5, 12) and filtering through membrane filters (5) and coal filters (7) or vice versa. The process and plant is suited for purifying the waste water from olive oil pressing called alpechin. |