TSS, TDS AND TS OF EFFLUENTS FROM POTASSIUM HYDROXIDE AND CALCIUM HYPOCHLORITE BLEACHING

The use of different raw materials and chemicals by pulp and paper industries during pulp and paper production has contributed immensely to the pollution load on the environment. This research used TCF (KOH) and Hypochlorite (CaCIO)2 to bleach pulped agricultural residue (kenaf stem) to determine one with better environmental parameters. The dewatered kenaf was pulped with different concentrations of sodium hydroxide and formic acid at different time intervals. At the end, the pulp from each cooking was bleached with 20%, 60% and 90% concentrations of potassium hydroxide and calcium hypochlorite and the bleaching time were varied from 1hr, 2 hrs and 3 hrs at room temperature and TSS, TDS and TS of the bleaching effluents were compare for environmental quality. From physical pulp quality, 60% concentration and 2 hrs bleaching was selected and the effluent from that gave TSS 507.5 mg/L, TDS 2341.5 mg/l and TS 2849 mg/L for KOH and TSS 4492.5 mg/L, TDS 3707.5 mg/L and TS 8200 mg/L for Ca(CIO)2. This result showed that the effluent from KOH bleaching has lower pollution load.