Abstract
Pulp and paper industry is one of the major water users and discharges large quantities of highly-colored effluent, which causes an environmental pllution problem. The purpose of our study is the renovation and the reuse of its waste water. This paper is concerned with the removal of lignin from kraft pulp mill waste water by means of fly ashes. It was found that fly ashes were nearly as effective as activated carbon in the removal of lignin, and carbon and calcium contained in the fly ashes contributed to that lignin removal. The results of DTA measurements far fly ashes and lignin showed that lignin was decomposed at from 200 to 400°C and the carbon in the fly ashes burns at over 500°C. The spent fly ashes regained fairly their abliity to remove lignin when heated at from 400 to 500°C and added some calcium hydrate. When the total effluent and washing waste water of a KP mill were treated by fly ashes 20g/l, the lignin and COD were removed about 70 and 50% respectively.
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