Activated sludge model and solving method used for nitrification stage steady state solution

Abstract

The invention discloses an activated sludge model and solving method used for nitrification stage steady state solution. The method comprises the following steps: (1) carrying out reasonable reduction on an ASM3 (Activated Sludge Model 3) model, and constructing the chemometrics model and the process rate equation of the ASM3 model; (2) coupling an oxidation process of NO2<-> with a growth attenuation process of NOB (Nitrite Oxidizing Bacteria), and constructing the chemometrics model and the process rate equation of the ASM3 model by using the ASM3 model as a reference; and (3) according to the model, constructing the mass balance equation of each component according to the model, utilizing MATLAB mathematical software to obtain the analytical solution of each component, and substituting each class of parameters and working conditions, and finally, determining the concentration of each component in the model. The method can be used for the nitrification stage steady state solution, and also can be used for determining an initial value during dynamic simulation. Therefore, the activated sludge model constructed by the method is high in practicality.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment and resource utilization, and in particular relates to an activated sludge model and a solution method for steady-state solution in the nitrification stage. Background technique [0002] In the process of sewage treatment, when the inflow and process conditions do not change with time, the concentration of each component in the sewage treatment facility remains unchanged or changes within a small range, and the treatment system is in a steady state at this time. The study of the steady-state treatment process of sewage can realize the determination of the initial value of the initial design of the sewage plant and the dynamic simulation of the later period. At the same time, for the nitrogen removal process in traditional sewage treatment, the aerobic nitrification stage is carried out first, so an activity that is more in line with modern research theory is used for the steady...

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Problems solved by technology

[0003] At present, a large number of steady-state models based on the activated sludge No. 1 model (ASM1) proposed by the International Water Association have been constructed at home and abroad. However, the modeling theory of the No. 1 model itself is relatively backward compared with the current research results, and due to the The process requires a more detailed description of the nitrogen removal process, which makes the relatively simple No. 1 model not well able to meet its simulation requirements

At the same time, there is a relatively lack of calculation methods for the steady-state model of the nitrification stage, or the cost of solving the existing activated sludge calculation software is too high. The steady-state activated sludge model of the nitrification stage, which can be described in detail and can be easily solved, has important theoretical research significance and engineering application value

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