The characteristics, pollution load and anaerobic biodegradability of the wastewater from an alkaline peroxide mechanical pulping (APMP) process using kenaf stem wood as raw material were investigated. The wastewater had a high anaerobic biodegradability, although it contained peroxide which is toxic to anaerobic bacteria. A biological preacidogenic reactor was used to eliminate peroxide toxicity and acidify the wastewater, which then entered a UASB reactor. The results showed that the wastewater could be treated efficiently using the two-phase UASB system. At 36#xB1;1#xB0;C and an average loading rate of 12 kg COD m#x2212;3d#x2212;1, 84 COD removal, 96 BOD removal and a methane yield of 0.30 Nm3kg#x2212;1COD removed were achieved.
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