Fenton's reagent oxidation wastewater treatment method and device thereof

Abstract

The invention belongs to the field of wastewater treatment technology and specifically relates to a Fenton's reagent oxidation wastewater treatment method and a device thereof. Wastewater to be treated enters a 1-stage pH regulating tank, and concentrated acid is extracted from a concentrated acid storage tank through an acid adding pump to carry out first-step pH regulation; an effluent from the 1-stage pH regulating tank enters a 2-stage pH regulating tank, and diluted acid is extracted from a diluted acid storage tank through an acid adding pump to carry out second-step pH regulation; an effluent from the 2-stage pH regulating tank enters an oxidation reaction tank, hydrogen peroxide and ferrous sulfate are added into an inlet of the oxidation reaction tank through a dosing pump, and a reaction is conducted after mechanical agitation or air agitation and mixing of the materials and wastewater; after pH regulation of an effluent from the oxidation reaction tank is achieved by addition of alkali, the effluent enters a sedimentation tank, and the effluent from the oxidation tank undergoes solid-liquid separation in the sedimentation tank and finally discharging is followed. Dosage of the oxidizer is controlled precisely so as to avoid less or excessive dosage of the drug. It is ensured that the treatment effect is stable, and treatment cost is effectively reduced. Degree of automation is high, and manual operation difficulty is reduced.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method and a device for treating wastewater oxidized by Fenton's reagent. Background technique [0002] With the improvement of human living standards and the rapid development of industrial production, more and more urban wastewater and industrial wastewater are produced correspondingly. Among them, most of the biodegradable wastewater is currently treated by biological methods. Wastewater containing refractory organic matter and toxic and harmful substances, such as wastewater from industries such as medicine, petrochemical, printing and dyeing, and papermaking, has large discharge, wide pollution, and poor biodegradability. The characteristics make it difficult for conventional physical, chemical and biological methods to meet the technical and economic requirements of purification treatment, which has become a difficult problem in the field of water...

AI Technical Summary

Problems solved by technology

[0005] 1. The pH control of the oxidized influent is not accurate enough

Controlling the pH of wastewater at an appropriate value is the most important condition for the oxidation of wastewater by the Fenton reagent process. However, some wastewater contains a high carbonate alkalinity, which acts as a buffer for pH adjustment, resulting It is difficult to adjust the pH of the wastewater to an appropriate value; and because the alkalinity of the wastewater generated by the production unit sometimes changes greatly, the constant acid addition will cause the pH of the oxidation influent to fluctuate, which will affect the Fenton Reagent oxidation treatment effect

For wastewater with the same alkalinity, there will be a "mutation point" where the pH value suddenly drops after adding acid. This is because the alkalinity in the water is completely neutralized by acid and cannot act as a "buffer". Continue to use concentrated acid It will be more difficult to adjust the pH value

Therefore, it is difficult to adjust the pH value accurately in the actual industrial application of the Fenton oxidation process, resulting in a decline in the treatment effect.

[0006] 2. The dosage control of oxidant is not precise enough

The method of adding a constant amount of oxidant in the existing device will not only lead to unstable COD of the effluent, but also sometimes excessive dosing, resulting in waste of medicament, and will also affect the detection of COD of the effluent (the remaining hydrogen peroxide in the effluent will affect the detection of COD. detection has an impact)

[0007] 3. The process is complex and the operation is difficult and intensive

[0011] Compared with the present invention, this related patent does not accurately control the pH of the reaction according to the type of wastewater to be treated, and the reaction effect is poor; this related patent makes the oxidation reaction complete by adding oxidants and catalysts in batches, but does not Consider adding oxidants and catalysts through the total amount of organic matter in wastewater. If the quality and quantity of wastewater vary greatly, the treatment effect will be unstable.

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