Abstract
Coagulation characteristics of hemicelullose which is one of main pollutants in sulfite mill effluent, were investigated by the use of xylan and glucomannan isolated from wood shavings. Aluminum sulfate was used as coagulant. The effect of the coexistence of lignosulfonate was also discussed in relation to the efficiency of coagulation.
The results are summarized as follows ;
(1) Xylan showes the higher pH dependency and the lower coagulation efficiency than those of glucomannan. These differences are considered to be mainly due to the amount of glucuronic acid unit.
(2) The presence of lignosulfonate is very effective for the promotion of hemicelullose removal by coagulation. From this phenomenon, it is clear that the entanglement or adsorption to the coflocculated precipitate of lignosulfonate and coagulant plays the very important role in the removal of hemicellulose.
