目前关注的是模拟不同废水处理过程中微污染物的命运。此外,在过去的几年里,人们对开发包含悬浮生物质和生物膜的混合反应器越来越感兴趣。这里,一种新的模型,试图确定混合反应器中的微污染物的命运,如移动床生物膜反应器(MBBR),并称为ASM-生物膜-MPs模型考虑了导致微污染物去除的主要机制(吸附/解吸,生物降解,混合反应堆中的代谢)。该动态模型使用一级动力学用于生物转化和吸附/解吸方程,描述了混合反应器中微污染物的命运。此外,它考虑了碳氧化的反应,硝化,在好氧条件下附着和悬浮生物质中的反硝化作用。数学模型由三个相连的模型组成,用于模拟微污染物,悬浮生物质,和生物膜。根据活性污泥模型编号评估生化转化率。1(ASM1)的附着和悬浮生物质。该模型适用于实验室MBBR,添加含有4-壬基酚(4-NP)作为微污染物的合成废水,并准确地描述了COD的实验浓度,附着和悬浮的生物质,氮,和在不同负荷下工作180天期间获得的4-NP微污染物。sCOD在所有运行期间的模拟和实验之间的差异,NH4-N,NO3-N,附着和悬浮生物量浓度低于15%,10%,10%,5%和5%,分别。最后,计算了吸附和生物降解机制在4-NP命运中的贡献,当4-NP浓度设置为1µg/L时(生物降解=86.5%,吸附=5%)和50µg/L(生物降解=55.9%,吸附量=34.7%)。
Modelling the fate of micropollutants in different wastewater treatment processes is of present concern. Moreover, during the last few years, there has been an increasing interest in the development of hybrid reactors which contain both suspended biomass and biofilm. Here, a new model developed which tries to determine the fate of micropollutants in hybrid reactors such as moving bed biofilm reactor (MBBR) and called the ASM-biofilm-MPs model considered the main mechanisms leading to the micropollutant removal (sorption/desorption, biodegradation, cometabolism) in hybrid reactors. This dynamic model describes the fate of micropollutants in a hybrid reactor using first-order kinetics for biotransformation and sorption/desorption equations. Also, it considered the reactions for carbon oxidation, nitrification, and denitrification in attached and suspended biomass under aerobic conditions. The mathematical model consists of three connected models for the simulation of micropollutants, suspended biomass, and biofilm. Biochemical conversions are evaluated according to the Activated Sludge Model No. 1 (ASM1) for both attached and suspended biomass. The model is applied for a laboratory MBBR, which fed with synthetic wastewater containing 4-nonylphenol (4-NP) as micropollutant, and accurately describes the experimental concentrations of COD, attached and suspended biomass, nitrogen, and 4-NP micropollutant obtained during 180 days working at different loadings. The differences between simulations and experiments in all operational periods for sCOD, NH4-N, NO3-N, and attached and suspended biomass concentrations were less than 15%, 10%, 10%, 5% and 5%, respectively. Finally, the contribution of adsorption and biodegradation mechanisms in the fate of 4-NP was calculated, when 4-NP concentration is set to 1 µg/L (biodegradation = 86.5%, sorption = 5%) and 50 µg/L (biodegradation = 55.9%, sorption = 34.7%).