Optimized design method of photobioreactor for cultivating microalgae in waste water

Abstract

The invention belongs to the technical field of environmental protection and particularly relates to an optimized design method of a photobioreactor for cultivating microalgae in waste water. The method includes the first step of establishing a chlorella polyculture growth model on the basis of studies of the autotrophic growth kinetics and the heterotrophic growth kinetics of chlorella and obtaining an organism degradation kinetic model on the basis of the chlorella polyculture growth model, the second step of establishing a gas-liquid two-phase two-dimensional transient CFD model where a flow field of the photobioreactor and chlorella biochemical reaction are coupled on the basis of an Euler-Euler two-fluid system, and carrying out a simulation study on dynamic behavior characteristics of the chlorella in the intermittent process where the chlorella degrades organic substances in the gas-liquid two-phase airlift flat-plate photobioreactor, and the third step of finally carrying out experimental verification on a model simulation result according to an experimental curve of the chlorella concentration and the organic substance concentration changing over time. Consequently, the model which is capable of predicting the growth situation of the chlorella and the degradation situation of the organic substances in the photobioreactor is established, and an important theoretical basis is established for optimization design of structural parameters and operating parameters of the photobioreactor.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to an optimal design method of a photobioreactor for cultivating microalgae in sewage. Background technique [0002] The global warming caused by the excessive emission of carbon dioxide and other greenhouse gases is having an increasingly obvious impact on human society. Reducing greenhouse gas emissions and controlling climate change has gradually attracted the attention of the international community. Urban domestic sewage treatment is a very important source of carbon dioxide emissions, and the use of sewage to cultivate microalgae can not only reduce carbon dioxide emissions in the atmosphere, but also extract many high-value compounds. Therefore, it is of great significance to develop a high-efficiency photobioreactor for cultivating microalgae in sewage. [0003] Photobioreactor refers to a type of device photobioreactor that can be used for ph...

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Problems solved by technology

[0004] However, traditional experimental methods are often limited by factors such as measurement accuracy and model size, and it is difficult to conduct microscopic and instantaneous flow field analysis

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