SUYu-chen,LIPeng-fei,ZHANGXin-yun,et al.Precise Dosing Control System of Flocculant Based on Time-series Neural Network[J].China Water & Wastewater,2023,39(3):56-61.
Precise Dosing Control System of Flocculant Based on Time-series Neural Network
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第3期
Page:
56-61
Column:
Date of publication:
2023-02-01
- Keywords:
- time-series neural network; flocculation monitoring; precise dosing; machine vision; effluent turbidity
- Abstract:
- The coagulation and precipitation process in waterworks is affected by many factors such as hydraulic conditions, raw water quality, flocculant dosage, water temperature and pH, and has the characteristics of nonlinear, large time delay and multi-disturbance. The traditional manual dosing method relies on subjective experience, so it is difficult to adjust the dosage of flocculant dynamically and accurately according to the changes in environment and water quality,which is easy to cause problems such as unstable water quality of sedimentation tank or excessive dosing of chemicals. Therefore, a flocculant precise dosing control system composed of distributed underwater monitoring platform and time-series neural network combined with PID control algorithm was developed. Firstly, the area ratio and morphological characteristics of the flocculent particles were analyzed by the image segmentation algorithm based on machine vision, the flocculation reaction performance was comprehensively evaluated through the multidimensional characteristics, and an early warning function for the deviation of flocculation was provided. Secondly, based on the medium and long term monitoring data in the database, the time-series neural network prediction model was iteratively trained to conduct multi-step advance prediction of effluent turbidity. The challenge of the automatic control algorithm brought by the large time delay response and multi-factor disturbance in the flocculation and precipitation process was overcame. After adopting the precise dosing control system, the fluctuation range of effluent turbidity was reduced by 62%, and the dosage of flocculant was reduced by 25%. On the premise of ensuring the stability of effluent quality, the system achieved the goal of significantly reducing the dosage of chemicals.
Last Update:
2023-02-01