Liquid effluent from steaming beech wood was studied. The effluent contains many phenolic compounds which can present a significant toxicity. The effluent was treated by oxidation was carried out at 250 rpm for 30 min with NaOH. This was followed flocculation with CaCl2 for 30 min. The influence of parameters such as pH, time of autoxidation were studied. Experimental results reveal the electrostatic interaction between the oppositely charged wood extracts after oxidation and flocculation. The increase in aqueous phase pH resulted in enhanced removal of wood extracts from water. The effect of pH is explained based on oxygen uptake.

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