EFFICIENCY EVALUATION OF ACTIVATED-SLUDGE TREATMENTS OF WASTE-WATER FROM FIBER BOARD MANUFACTURING

Wastewater from fiber board manufacture consisting in a mixture of Pin us radiata, Eucaliptus globulus and Laureliopsis phillipiana (tepa) (3 :1:1) has been studied in laboratory scale activated sludge reactors w ith organic load rate range of 50-1700 gCOD/m(3).d. A stable operation at high organic load rate with hydraulic retention time of one day wa s achieved. Purification efficiencies up to 90% of COD removal could b e achieved in an activated sludge treatment of fiber board wastewater working with 1 day HRT for wood log cooking wastewater and with 4 days HRT when glueing wastewater is added to the cooking wastewater treatm ent. Suspended solids, color and phenol concentration were negligible in the efluent of the activated sludge system.