Automatic control device and method for Fenton oxidation reactor for treating lignite upgrading wastewater

Abstract

The invention discloses an automatic control device and method for a Fenton oxidation reactor for treating lignite upgrading wastewater. The method comprises a water feeding procedure, an acidic pH value regulation and control procedure, a Fenton reagent feeding procedure, a Fenton oxidation reaction procedure, a flocculation procedure, a settling procedure and water and sludge discharging procedures which are performed in sequence. In the acidic pH value regulation and control procedure, acidic liquid feeding is automatically controlled by adopting a feedback control algorithm; in the Fentonreagent feeding procedure, feeding amounts of a ferrous sulfate solution and a hydrogen peroxide solution are automatically controlled by adopting a set redox potential threshold value control strategy; in the Fenton oxidation reaction procedure, alkaline liquid feeding is automatically controlled by adopting a control strategy that a first-order derivative of a redox potential to a time period isin plateau; in the flocculation procedure, the alkalinity of a solution in the Fenton oxidation reactor is automatically controlled by adopting the feedback control algorithm. Therefore, the device and the method which are provided by the invention can automatically regulate and control a pH value, the generation amount of .OH and a Fenton oxidation reaction process, so that the lignite upgradingwastewater treatment efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater purification, in particular to an automatic control device and method for a Fenton oxidation reactor for treating lignite upgrading wastewater. Background technique [0002] Lignite is a kind of coal, which has the characteristics of high moisture, low calorific value, easy weathering and spontaneous combustion, which is not conducive to long-distance transportation and storage. The thermal efficiency of direct combustion is low, the emission of greenhouse gases is large, and the moisture in coal needs to be reduced to less than 10% for liquefaction, dry distillation and gasification of lignite as raw material. Therefore, if lignite is not upgraded, it will be difficult to use it efficiently. [0003] Lignite produces a large amount of wastewater during the upgrading process, which contains a large amount of humic acid, phenol, methylphenol, alkylphenol, diphenol, alkylbenzenediphen...

AI Technical Summary

Problems solved by technology

For example, in the Fenton oxidation reaction system, the high pH value will inhibit the generation of OH, and the low pH will destroy Fe 2+ with Fe 3+ The conversion balance between them affects the progress of the catalytic reaction; H 2 o 2 When the dosage is low, the generation of OH is relatively small, and the processing efficiency is low. 2 o 2 If the dosage is too high, the OH produced by the Fenton oxidation reaction system will be captured; when the dosage of iron is too high, the color of the treated water and the sludge output will increase

In summary, the efficiency of the Fenton oxidation reaction system is affected by many factors, and the restrictive conditions also increase the complexity of the operation. It is a rather complicated dynamic process. If it is not monitored and controlled, it is difficult to achieve the ideal treatment effect.

Images