Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Sci Total Environ. 2019 May 10;664:45-52. doi: 10.1016/j.scitotenv.2019.02.007. Epub 2019 Feb 2.
Estimation of heterotrophic biomass concentration in activated sludge is essential to the design, operation and management of activated sludge process for wastewater treatment plants (WWTPs), and many methods have been developed for such a purpose. In this study, three respiration-based methods: the Exponential-growth-rate-based method (Exp-M), the Maximum-respiration-rate-based method (Max-M) and the Endogenous-respiration-rate-based method (End-M), which are frequently used for determining kinetic parameters in activated sludge models, were comparatively examined using experimental results from both full-scale municipal WWTPs and laboratory-scale reactors. Our study revealed the pros and cons of each method, which is valuable for method selection in different applications. The End-M can estimate all the fraction of biomass. However, the proper control of measuring condition is of great challenge. The Exp-M can only determine the exponential growth part of biomass as conditions employed during measuring may make a considerable part of biomass in a nongrowth status, resulting underestimation or even failure of calculation. The Max-M can determine the viable biomass including the nongrowth part, and it is recommended for rapid assessment of biomass. The Max-M was modified after the introduction of a coefficient SOUR (the specific oxygen utilization rate when the sludge retention time was assumed zero) and was validated by using the experimental results reported in previous studies. Because of its simplicity and much improved accuracy, the modified Max-M method is able to provide more useful information about activated sludge compositions and has a promising application potential in wastewater treatment plants.
估算活性污泥中的异养生物量浓度对于污水处理厂（WWTP）的活性污泥工艺的设计、运行和管理至关重要，为此已经开发了许多方法。在本研究中，使用来自大型市政 WWTP 和实验室规模反应器的实验结果，比较了三种基于呼吸的方法：基于指数增长速率的方法（Exp-M）、基于最大呼吸速率的方法（Max-M）和基于内呼吸速率的方法（End-M），这些方法常用于确定活性污泥模型中的动力学参数。本研究揭示了每种方法的优缺点，这对于不同应用中的方法选择具有重要价值。End-M 可以估算所有生物量的分数。然而，适当的测量条件控制是一个巨大的挑战。Exp-M 只能确定生物量的指数增长部分，因为测量中采用的条件可能会使生物量的相当一部分处于非生长状态，从而导致低估甚至计算失败。Max-M 可以确定包括非生长部分在内的有活力的生物量，因此建议用于快速评估生物量。在引入 SOUR（当假设污泥停留时间为零时的比耗氧速率）系数后对 Max-M 进行了修正，并使用以前研究报告的实验结果进行了验证。由于其简单性和大大提高的准确性，改进的 Max-M 方法能够提供有关活性污泥成分的更有用信息，并且在污水处理厂中具有广阔的应用潜力。
