the solution used for washing was with the same composition as that of the solution in the aerobic pool for sewage treatment the aerobic washing pool was kept in the aerated state in the immersion period with the aerated dissolved oxygen of 3 to 5 mg l next the manually peeled ramie treated in the aerobic washing pool was placed into the alkali hydrogen peroxide one bath scouring bleaching pool in a bath ratio of 1 17 weight volume ratio and immersed in a solution of 2 8 g l naoh and 0 5 g l h 2 o 2 to react at the temperature of 80 u00b0 c for 2 h the reaction liquid was discharged into the waste alkali bath pool then the manually peeled ramie treated in the alkali hydrogen peroxide one bath scouring bleaching pool was placed into the fiber separating and washing device in a bath ratio of 1 17 weight volume ratio the fiber separating in the present invention can be performed either by rolling and rubbing manually or in a mechanical way the washing time was 4 h finally the raw fibers treated by fiber separating and washing were immersed in a solution with a cellulose concentration of 20 u international units in a bath ratio of 1 17 weight volume ratio and reacted at the temperature of 55 u00b0 c for 2 h so as to perform the bio enzyme washing the effluents from the waste alkali bath fiber separating and washing and bio enzyme washing were pumped into the conditioning pool for sewage treatment and treated in the anaerobic pool the first precipitation pool the aerobic pool the second.