Performance analysis of the activated sludge model number 1 in a two reactor cascade

IF 3.5 2区农林科学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Food and Bioproducts Processing Pub Date : 2024-10-30 DOI:10.1016/j.fbp.2024.10.019

S.D. Watt , M.I. Nelson , H.S. Sidhu , F.I. Hai

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Abstract

We provide theoretical insights into the activated sludge process by utilising the activated sludge model number 1 in a two reactor cascade with an ideal settling unit. The process configuration contains a settling unit and a recycle unit. We investigate how the removal of organic carbon and total nitrogen depend upon the hydraulic retention time as well as the process configuration, namely the impact of aeration, the presence of a settling unit, and recirculation of mixed liquor from the second reactor to the first reactor. As the hydraulic retention time increases from zero there are two critical values. Organic carbon can only be removed for values of the retention time higher than the first critical value. Removal of organic nitrogen occurs in conjunction with the removal of organic carbon.

Heterotropic and autotrophic biomass are only viable for values of hydraulic retention larger than the first and second critical values, respectively. Inorganic nitrogen can only be significantly removed when autotrophic biomass are present. However, the removal of inorganic nitrogen is significantly influenced by the process configuration.

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双反应器级联中 1 号活性污泥模型的性能分析

我们利用带有理想沉淀单元的双反应器级联中的 1 号活性污泥模型，对活性污泥法进行了理论探讨。工艺配置包括一个沉淀单元和一个循环单元。我们研究了有机碳和总氮的去除率如何取决于水力停留时间和工艺配置，即曝气、沉淀单元的存在以及混合液从第二反应器到第一反应器的再循环的影响。随着水力停留时间从零增加，有两个临界值。只有当水力停留时间高于第一个临界值时，才能去除有机碳。只有当水力停留时间大于第一个和第二个临界值时，异养生物质和自养生物质才能存活。只有自养生物量存在时，无机氮才能被大量去除。不过，无机氮的去除受工艺配置的影响很大。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Food and Bioproducts Processing 工程技术-工程：化工

CiteScore

9.70

自引率

4.30%

发文量

115

审稿时长

24 days

期刊介绍： Official Journal of the European Federation of Chemical Engineering: Part C FBP aims to be the principal international journal for publication of high quality, original papers in the branches of engineering and science dedicated to the safe processing of biological products. It is the only journal to exploit the synergy between biotechnology, bioprocessing and food engineering. Papers showing how research results can be used in engineering design, and accounts of experimental or theoretical research work bringing new perspectives to established principles, highlighting unsolved problems or indicating directions for future research, are particularly welcome. Contributions that deal with new developments in equipment or processes and that can be given quantitative expression are encouraged. The journal is especially interested in papers that extend the boundaries of food and bioproducts processing. The journal has a strong emphasis on the interface between engineering and food or bioproducts. Papers that are not likely to be published are those: • Primarily concerned with food formulation • That use experimental design techniques to obtain response surfaces but gain little insight from them • That are empirical and ignore established mechanistic models, e.g., empirical drying curves • That are primarily concerned about sensory evaluation and colour • Concern the extraction, encapsulation and/or antioxidant activity of a specific biological material without providing insight that could be applied to a similar but different material, • Containing only chemical analyses of biological materials.