Modularized neural network effluent ammonia nitrogen soft measurement method based on EMD algorithm

Abstract

The invention discloses an effluent ammonia nitrogen soft measurement method of a modular neural network based on an EMD algorithm, and aims to solve the problems that the effluent ammonia nitrogen concentration is difficult to quickly and accurately detect in real time in a sewage treatment process and the effluent quality is ensured to reach the standard in real-time emission. The method comprises the steps: establishing an effluent ammonia nitrogen prediction model by utilizing the modular neural network based on the EMD algorithm, wherein the model comprises the steps of decomposing an effluent ammonia nitrogen time sequence into a plurality of simple, single-frequency and independent sub-time sequences by using an EMD-based task decomposition algorithm; calculating the complexity and similarity of the sub-time sequences by adopting sample entropy and Euclidean distance, combining the sub-time sequences with low complexity and high similarity, and establishing the corresponding sub-network module for learning. The result shows that the prediction model can automatically adjust the network structure, accurately predicts the effluent ammonia nitrogen concentration in the sewage treatment process, and ensures the stable and safe operation of the sewage treatment process.

Description

technical field [0001] The invention relates to the technical field of artificial intelligence, and more specifically, relates to a method for soft sensing of effluent ammonia nitrogen based on a modular neural network of an EMD algorithm. Background technique [0002] Ammonia nitrogen is the main factor causing water environmental pollution and eutrophication of water bodies. The "China Marine Ecological Environment Status Bulletin" published in 2018 shows that some sea areas in my country are in a state of eutrophication. Therefore, in urban sewage treatment plants, ammonia nitrogen in the effluent Concentration is one of the key indicators to evaluate whether the effluent quality in the sewage treatment process is up to standard. The current effluent ammonia nitrogen concentration measurement methods include chemical reaction-based measurement methods and mechanism model-based measurement methods; the chemical reaction-based measurement method is to measure the ammonia nit...

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