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Characteristics of Effluent from Potassium Hydroxide and Calcium Hypochlorite Bleaching of Pulp from Kenaf Stem

Waste and wastewaters are generated from both pulp and bleaching processes of paper making. However, like many industrial processes it has impacted our environment and our health. A dewatered kenaf stem was bleached in the 20%, 60% and 90% concentrations of potassium hydroxide and calcium hypochlorite at time intervals of 1hr, 2hrs and 3hrs to compare the COD and BOD of their effluent for environmental friendliness. After examining the whole concentrations and the time intervals, 60% concentration of the chemicals at 2hrs bleaching gave better pulp on physical examination. When the COD of the effluent of two chemicals were analysed, potassium hydroxide effluent had a COD of 784mg/L while that of hypochlorite was 3240mg/L. Also the BOD of potassium hydroxide effluent was 16.88mg/L while that of hypochlorite effluent gave 18.75mg/L. The report of this study showed that bleaching of kenaf pulp with 60% potassium hydroxide for 2 hrs has lower COD than the use of hypochlorite while the two have almost the same BOD.