Abstract
Parameters of Effluent from Bleaching Pulp with Potassium Hydroxide and Calcium Hypochlorite
Highlights
Man has been using the natural resources since beginning of civilization
The pulped kenaf stem was bleached with 20%, 60% and 90% concentrations of potassium hydroxide and calcium hypochlorite and the bleaching time were varied from 1hr, 2hrs and 3hrs at room temperature
The result of analyses of effluent from bleaching with 60% concentration of KOH showed that the value of chemical oxygen demand (COD) decreased with increase in time from 996mg/L to 312mg/L unlike the biological oxygen demand (BOD) which its lowest value was recorded after 2hrs
Summary
Man has been using the natural resources since beginning of civilization. The primitive man was totally depend on natural resources for his existence. The major problems of the wastewaters from paper mills are high organic content, dark brown coloration, adsorbable organic halide and toxic pollutants These pollutants are mixed together and a complex-colored effluent is formed with high chemical oxygen demand (COD), biological oxygen demand (BOD) and total dissolved solid pollution load and color contributing substances from the pulp paper mill effluents causes serious aquatic and soil pollution [7]. Both unbleached and bleached pulp is produced to meet the requirement of paper. Effluents from bleaching kenaf pulp with potassium hydroxide and calcium hypochlorite in a single stage process under laboratory conditions were analysed to check the effects of chemicals, concentrations and time on their physicochemical parameters
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