Color Removal and Biodegradability Enhancement of Chemical Pretreatment Effluent of Eucalyptus Chemithermomechanical Pulp (CTMP) by Zero-Valent Iron

2009 3rd International Conference on Bioinformatics and Biomedical Engineering Pub Date : 2009-06-11 DOI:10.1109/ICBBE.2009.5162522

Li-rong Lei, You-ming Li, Xuejin Zhang

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引用次数: 2

Abstract

Deep color and high concentration of organic compounds are the important characteristics of Chemithermomechanical pulp (CTMP) effluent. The objectives of this study are to investigate the feasibility of removing the color of eucalyptus CTMP chemical pretreatment effluent with zero-valent iron (Fe (0)) and to examine the effect of Fe (0) treatment on biodegradability enhancement of the effluent. The effect of operating conditions, including pH, reaction time, cast- iron filings dosage and size range, on color removal rate was discussed. Results showed that under certain conditions, color removal rate of the effluent reached about 90%. It was also found that chemical oxygen demand (COD) and 5 day biochemical oxygen demand (BOD5) of the effluent decreased evidently after zero-valent iron treatment, and BOD5 / COD increased from 0.27 to 0.42, which indicated that biodegradability of the effluent was obviously enhanced. Based on the results, it is feasible that zero- valent iron can be used for pretreatment of CTMP effluent before biological treatment processes.

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零价铁对桉树化学机械浆(CTMP)化学预处理出水的脱色及可生化性的提高

深颜色和高浓度的有机物是化学热力纸浆(CTMP)废水的重要特征。本研究的目的是探讨用零价铁(Fe(0))去除桉树CTMP化学预处理出水颜色的可行性，并研究Fe(0)处理对出水生物降解性的影响。探讨了pH值、反应时间、铁屑投加量和粒径范围等操作条件对脱色率的影响。结果表明，在一定条件下，出水的去除率可达90%左右。零价铁处理后出水的化学需氧量(COD)和5 d生化需氧量(BOD5)均明显降低，BOD5 / COD由0.27提高到0.42，出水的可生化性明显增强。结果表明，零价铁在生物处理前对CTMP废水进行预处理是可行的。

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2009 3rd International Conference on Bioinformatics and Biomedical Engineering

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