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Degradation of polyvinyl-alcohol wastewater by Fenton's reagent: Condition optimization and enhanced biodegradability 总被引:3,自引:0,他引:3
The pretreatment of refractory polyvinyl-alcohol (PVA) wastewater with low value of CODCr by Fenton’s reagent was investigated to enhance the biodegradability. The effects of operating conditions such as pH of the
solution, Fe2+ dosage, H2O2 dosage, reaction time and initial PVA concentration on the removal efficiency of CODCr were discussed. It is demonstrated that the optimum value of pH for removal of CODCr is 5 and the most suitable dosages of H2O2 (2%) and FeSO4 (10 mg/L) are 5% and 8.0%, respectively. When the initial CODCr value of the PVA water is 760 mg/L, the favorable reaction time is 110 min. Under these optimum conditions, the removal ratio
of CODCr is 58.6%–61.4%, and the value of biodegradability (CODB/CODCr) increases markedly from 8.9%–9.7% to 62.6%–68.3%. 相似文献
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采用数值模拟方法研究了高效厌氧生物反应器内的湍流及多相流传质过程。通过重整化群k ε湍流模型(RNG k ε)和欧拉多相流模型构建反应器内多相湍流流动控制方程。在此基础上,应用自定义函数(UDF)方式修正了计算流体力学软件Fluent中的曳力模型,并植入欧拉多相流模型,建立高效厌氧生物反应器内气 液 固多相流动模型,并模拟计算了反应器内多相流过程,同时对其结构进行优化。结果表明,修正后的多相流动模型计算得到的流场特征与实验数据吻合,验证了所采用的湍流模型和计算方法的准确性;优化后的反应器内多相流传质效果明显提高。该方法较为准确地预测了反应器内传质过程,可以用于高效厌氧生物反应器的工程应用改进。 相似文献
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西南联大在中国近代教育史上创造了一个奇迹,培养了一批优秀人才,人才培养与学校的课程设置以及其教师的教学方法有密切关联,本文从课程设置与教师的角度来探索西南联大何以培养众多驰名中外的学者. 相似文献
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TiO2光催化复合分离膜是近几年出现的一种集光催化和膜分离作用于一体的新型多功能复合膜,多用于水处理中.将光催化剂TiO2负载于膜表面或者内嵌于膜中,制备成光催化复合分离膜,不仅解决了TiO2的回收问题,且能在一定程度上缓解或者消除膜污染问题;在发挥光催化和膜分离作用的同时,还能产生一系列的协同作用,以加强污染物的处理... 相似文献
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