摘要
在污水处理中,膜生物反应器的优势日益明显,但膜污染问题已经成为阻碍该工艺进一步推广的瓶颈。在三大类影响因素中,污泥混合液的特性对膜污染起到了主要的作用,因此对污泥混合液特性的研究已成为当前国内外研究膜污染问题的主要方向。本文从非线性动力学的角度出发,对活性污泥的稳定性以及膜生物反应器中胞外聚合物EPS和可溶性微生物产物SMP的形成机理进行了研究。在实验数据的基础上,通过数值模拟,证明了所建数学模型的正确性,并利用非线性动力学理论,对模型进行了稳定性分析。
在分析污泥稳定性中,通过简化传统的ASM1污泥模型提取出污泥和污水中底物的非线性动力学作用关系,建立了一个适用由于膜生物反应器的简化二维数学模型。通过修正原模型参数,该模型能够和实验数据吻合良好,证明了该模型的有效性。在此基础上从非线性动力学的角度对数学模型进行了有界性的验证和分析,从理论的角度给出了模型参数的选取范围。
在研究EPS和SMP生成机理中,根据质量守恒原理提出了一个新的解释EPS和SMP生成机理的数学模型,此模型结构简单,仅有底物、活性污泥、EPS和SMP四个组分,且参数确定工作量小,通过实验验证可知该模型能正确的模拟出膜生物反应器中的污泥生长和SMP形成的生物反应过程。
Advantages of membrane bioreactor (MBR) are increasingly in evidence in sewage treatment. But the problem of membrane pollution has become a bottleneck blocking the development of the technics. In the three kinds of impact, the characteristic of sludge has played an important role in membrane pollution and has been the main aspect of research in membrane pollution.
In this paper, A two dimension mathematical model which is applicable for membrane bioreactor (MBR) was proposed by simplifying the dynamical relations in ASM1 active sludge model. With some new parameter combinations, the simulation results fit the testing data well, so the accuracy of this model was proved. Then the boundedness and the stability of this model was analyzed in the view of nonlinear dynamics, and the choice region of the parameters was gained theoretically.
In the research of theory of the building of EPS and SMP, One new mathematical model was proposed to explain the relationships among between soluble microbial product and extra cellular polymeric substances in MBR. This model has a simple structure with only four variables:Original substrate,active biomass, soluble microbial product and extra cellular polymeric substances. With a set of parameters model outputs capture all trends observed in the experiment.
引文
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