用生物膜模型验证了生物反应器脱氮(硝化)计算方法

O. Oliynyk, Sergiy V. Telyma, Y. Kalugin, Yevheniy O. Oliynyk
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引用次数: 0

摘要

本文建立了在生物反应器中添加固定菌体作为生物膜的复合氨氮(硝化)净化废水参数的数学模型和计算方法。对不同因素对废水净化参数的影响进行了评价。根据Monod非线性方程,利用反应动力学计算了生物膜内外表面的氮浓度,并评价了给定厚度的生物膜的功效率与氮污染在生物膜中的渗透特性的关系。结果表明,生物膜的厚度和流量随着生物膜表面的撕裂速度的增加而减小,而随着氮浓度的增加,这些参数也随之增加。此时,底物流量和进入生物膜的深度是生物膜表面底物浓度、生物膜内反应速度和扩散传质的函数。作为评价氧对控制氨氧化制亚硝酸盐过程影响的主要参数,提出了氧与氨氮浓度的关系。具体算例和计算表明,与氧浓度相比,所给出的关系式可以更好地用于反应器内硝化过程的控制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Substantiation of the calculation methods of the nitrogen removing (nitrification) in bioreactors with using on the biofilm models
The mathematic model and calculations of the waste waters cleaning parameters from the compounds ammonium nitrogen (nitrification) in bioreactors with additional using in theirs volume the fixed biocenosis as the biofilm are presented. The valuation of the different influence factors on the waste waters cleaning parameters is given. The kinetics of reaction according to Monod nonlinear equation is used that allow to calculate the nitrogen concentrations on the external and in the interior biofilm surfaces and to evaluate the efficiency of the biofilm work of the given thickness relative to penetration character of the nitrogen pollutions in it. As showed the biofilm thickness and the flow in it are decreasing as the tearing off velocity of the biomass from its surface is increasing where as at increasing of the nitrogen concentrations these parameters are increasing. At this the substrate flow and the penetration depth into the biofilm are the functions of the substrate concentration on the biofilm surface, velocity of the reaction within it and the diffusive masstransfer. As a main parameter for evaluation of the oxygen influence for control of the process of ammonium oxidation to nitrite the relation of the concentrations oxygen to ammonium nitrogen is proposed. The specific examples and calculations have showed the given relation may be better alternative for control of the nitrification processes in reactor in comparison with oxygen concentration.
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