Wastewater Treatment of Papermaking Tobacco Leaf with Anaerobic Granular Sludge, 2007 Engineering, Pulping & Environmental Conference

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Mature anaerobic granular sludge with a stable removal rate of CODcr(>85%) was obtained from a pilot-scale anaerobic reactor for wastewater treatment of a papermaking tobacco leaf plant. The microstructure of the granular sludge, such as particle size distribution and pore size distributions were studied. The characteristics of the original wastewater and anaerobic reactor effluent were analyzed by FTIR and GC-MS. Results showed that there were many complex substances such as fiber and cut-fiber, lignin, organic acids and nicotine in the wastewater of papermaking tobacco leaf characteristic of a large amount drainage, dark color, high concentrations of CODcr and BOD5. The main contaminations in wastewater were the hydrolysate of carbohydrates, lower carboxylic organic acids and higher fatty acids, which resulted in the acidity of the wastewater and the good biodegradation in the anaerobic process. But incomplete biodegradation of lignin and nicotine in the wastewater, which contributed to the dark color and remaining CODcr(>100 mg/L) were the limiting factors for the effectiveness and economics of wastewater treatments for the papermaking tobacco leaf industry.