造纸废水好氧生物处理过程中木质素的归宿

B. Helmreich, Christian Schlegl, P. Wilderer
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引用次数: 10

摘要

虽然已知木质素不易生物降解,但在序批式反应器(SBR)中对造纸废水进行好氧生物处理时,溶解木质素的浓度降低。进行了系统的实验室规模批量试验,以澄清所观察到的木质素去除是生物降解还是吸附到活性污泥上的结果。对于间歇式试验,污泥样本分别从顺序间歇式反应器中提取,固体滞留时间(SRT)分别为10、15、20、30和40天。通过包括热解、气相色谱和质谱分析(py-GC/MS分析)的分析程序来定量存在于散装液体和污泥样品中的木质素的量。结果表明,木质素对活性污泥的吸附率可达30%[TH]w/w。这表明污泥具有良好的吸附性能。木质素的最终去除是通过污泥的浪费来实现的。在SRT为20天的情况下,SBR污泥的总去除率最高。
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Fate of lignin in the process of aerobic biological treatment of paper mill wastewater
Although lignin is known to be not readily biodegradable the concentration of dissolved lignin decreased during aerobic biological treatment of paper mill wastewater performed in sequencing batch reactors (SBR). Systematic lab scale batch tests were conducted to clarify whether the observed removal of lignin was the result of biodegradation or adsorption onto the activated sludge. For the batch tests, sludge samples were taken from sequencing batch reactors operated at solid retention times (SRT) of 10, 15, 20, 30, and 40 days, respectively. The amount of lignin present in the bulk liquid and in the sludge samples was quantified by an analytical procedure comprising pyrolysis, gas chromatography and mass spectrometry (py-GC/MS analysis). It was found that lignin adsorbs onto the activated sludge by up to 30%[TH]w/w. This demonstrates the sludge excellent adsorption properties. The ultimate removal of lignin is achieved by sludge wasting. The highest overall removal rate was found when sludge was used from the SBR run at SRT of 20 days.
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