【作者】 钟飞；

【导师】 薛建军；

【作者基本信息】 南京航空航天大学 ， 材料学， 2002， 硕士

【摘要】 为有效治理草浆黑液的污染，提高草浆黑液的综合利用率，进而改善其对生态环境的影响，本文运用膜辅助电解（Membrane-Assisted Electrolysis）技术，对草浆黑液处理的基本理论，技术特征和影响因素进行了试验性的研究，并探讨了运用该技术进行草类制浆黑液碱回收处理的最佳工艺条件，具体研究成果和结论如下： 1．草浆黑液的碱回收 在本实验条件下，影响草浆黑液碱回收运行效率的因素主要包括离子交换膜的性能、电极材料、操作电压以及操作模式等。在此研究基础上，本文设计了三级串联处理的碱回收工艺方案，在最佳的操作工艺条件下，碱回收率达到90.1％，平均能耗3600kwh／tNaOH，处理时间45分钟。 2．草浆黑液中有机物的电化学氧化和COD_cr的变化 膜辅助电解技术的电化学氧化对草浆黑液中的具有还原性基团的有机物具有较强的氧化作用。光谱分析证明，草浆黑液中的有机物如变性半纤维素和难降解的木质素部分由于电化学作用而被氧化，剩余木质素因电极反应脱除钠离子生成木质素酸而被回收，因此流出液的COD_cr大幅度降低，同时生化性能明显提高。在较佳的实验条件下，黑液的COD_cr下降90％上。 3．膜辅助电解处理的木质素和氢气的回收 在膜助电解回收草浆黑液碱的过程中，因电极反应生成有用的工业产品氢气，阳极区生成不溶性的木质素酸，这些化学品的回收降低了碱回收的运行成本，提高了膜辅助电解技术的使用价值。 4．结论 实验结果表明，草浆黑液经过膜辅助电解处理后，不仅可以消除黑液中高浓度有机物和残碱对生态环境的污染，而且又可回收黑液中有用的碱（Na⁺）、木质素和电极反应产物氢气（H₂），从而获得显著的经济效益，因此这是一项既环保又经济的处理草浆黑液的新方法，具有较高的应用价值和推广价值更多还原

【Abstract】 Experimental Research On Treatment Of Straw Pulping Black Liquor By Membrane-Assisted ElectrolysisZhongFei(College of Material Science and Technology, Nanjing University of Aeronautics And Astronautics, Nanjing)AbstractIn order to efficiently diminish the pollution of Straw Pulping Black Liquor (SPBL) and recover useful products from it, experimental researches have been done on basic theories, technical specification and influencing factors of disposing of SPBL by Membrane-Assisted-Electrolysis (MAE). After research, we got the following conclusions:1. Sodium Recovery From SPBLUnder experimental conditions, the influencing factors of sodium recovery from SPBL include performance of Ion-Exchange membrane, polar material, voltage and operation process etc. According to the results by researching, we made a technical scheme with three-stage processing, under best conditions, it cost 45 minutes to recover more than 90% sodium SPBL with average 3600kwh/t NaOH.2. Electrochemical oxidization and the change of CODcrThe oxidization of positive polar area in MAE technology leads to strong oxidization of reducible substances in SPBL. It is clearly seen from Infrared Spectrogram that aromatic rings of straw lignin and modified hemicelluloses can be damaged during electrolyzing. Moreover, the unoxidized lignin can be recovered near positive polar area, because of which the CODcr of SPBL can be greatly reduced and the biochemical property apparently improved. Under good experiment conditions, more than 90% CODcr can be reduced.3. Recovery of hydrogen and straw ligninDuring the process of SPBL, we can recover hydrogen generated from reaction near negative polar area; we also can recover straw lignin from SPBL near positive polar area. All of these can increase the practical value of MAE technology.4. ConclusionsIt turned out from experiments that MAE technology can not only diminish the pollution of SPBJ, but also can recover sodium and straw lignin from it, by which we can get both environmental and economical benefits. Above all MAE technology is a efficient method of SPBL’ s treatment.更多还原