Ultrafiltration micro-flocculation accurate dosing control method and system

Abstract

The invention relates to the technical field of sewage treatment, and in particular, relates to an ultrafiltration micro-flocculation accurate dosing control method and system. The method comprises the steps: calculating a preset value of a first pressure difference before first backwashing and a preset value of a second pressure difference before last backwashing in each chemical enhanced backwashing period; calculating to obtain a preset value of a third pressure difference between the first pressure difference and the second pressure difference; predicting a predicted value of the third pressure difference; and comparing the preset value of the third pressure difference with the predicted value of the third pressure difference, and judging whether the chemical is continuously added or not. In the method provided by the invention, the preset value of the third pressure difference is obtained according to the preset value of the first pressure difference and the preset value of the second pressure difference, the predicted value of the third pressure difference is predicted according to the pressure difference curve formed by the online filtration pressure difference data, and the ultrafiltration operation state can be speculated by comparing the preset value of the third pressure difference and the predicted value of the third pressure difference; and the dosing state or dosage of a chemical can be adjusted in time according to the running state of ultrafiltration, so that good and stable running of an ultrafiltration system is ensured.

Description

technical field [0001] The present disclosure relates to the technical field of sewage treatment, in particular to an ultrafiltration microflocculation precision dosing control method and system. Background technique [0002] In water treatment, especially when it comes to advanced water treatment and sewage upgrading, ultrafiltration is a common membrane separation treatment process. However, during the operation of the ultrafiltration membrane system, pollution will gradually accumulate and cause membrane clogging, thereby increasing the energy consumption of the ultrafiltration operation and even reducing the water production of the system. [0003] In the prior art, while the ultrafiltration influent is being filtered, a flocculant is synchronously added online at the influent of the ultrafiltration to carry out micro-flocculation reaction, so that organic pollutants such as colloids and other extremely small particles smaller than the membrane pore size in the raw water...

AI Technical Summary

Problems solved by technology

[0004] However, the current micro-flocculation dosing system is simple and too direct. In most cases, the change of incoming water quality and the operating state of the ultrafiltration membrane can only be judged by humans, and the dosing of the dosing agent can only be regulated by simply adjusting the frequency of the dosing pump. quantity

If the water quality fluctuates greatly or the operating state of ultrafiltration changes greatly, the adjustment of the dosage of chemicals will lag behind or be difficult to match in time, resulting in instability or deterioration of the operating state of the system

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