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A study on the treatment of black liquor from bamboo pulping process with sequencing batch reactor biological technique



A study on the treatment of black liquor from bamboo pulping process with sequencing batch reactor biological technique



Huanjing Kexue 18(3): 30-33, 92



In this paper, the treatment of bamboo pulping black liquor in which lignin has been separated by acid with sequencing batch reactor (SBR) was investigated. The experimental results showed that BOD-5 and COD in black liquor is reduced remarkably with the treatment of SBR, BOD-5 removal rate is 70%-83%, COD removal rate is 54.5%-63%, the effluent BOD-5 and COD after the treatment are 76-101 mg/L and 419-500mg/L respectively when influent COD is 1090-1170mg/L. The technology of combining internal decomposition with SBR is more efficient for treatment of black liquor, BOD-5 and COD removal rate are 67%-68% and 71.4%-76.9% respectively, the effluent BOD-5 and COD from this system are 33-48mg/L and 242-315mg/L respectively when influent COD is 1046-1100mg/L. It is in keeping with GB8978-88 effluent standard. The internal decomposition remarkably increase the effectiveness of follow-up SBR treatment. In addition, the kinetics of first order degradation reaction of COD was studied. The kinetic constant and undegradable COD had been calculated. Simulated data tally with experimental data well.

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