Microbial Ecological Model of Filamentous Bulking and Mechanisms |
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Authors: | Jun-Bo Wang Li-He Chai Yu Zhang Li-Ming Chen |
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Institution: | (1) School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, P.R. China;(2) School of Environmental Science and Engineering, Nankai University, Tianjin, 300071, P.R. China |
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Abstract: | The paper proposes a prototype mathematical model for the interactions among filamentous bacteria, floc-forming bacteria and protozoa within completely mixed activated sludge systems, which is capable of describing the practical coexistence of three microorganisms in a generic way. The systems with substrate fluctuation and without substrate fluctuation are investigated, respectively. The results show that filamentous bulking will occur within an interested range of substrate concentrations under unsuitable dilution rates, particularly at low substrate concentrations. When substrate concentration fluctuates, the same-frequency synchronous control parameters are beneficial to prevent filamentous bulking. Thus, the present investigations not only reveal the cause of the problem of filamentous bulking theoretically, but also may provide a crucial theoretical foundation for overcoming it. |
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Keywords: | Microorganisms Filamentous bulking Ecological model Synchronous control |
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