Overall process method of Fenton-like air-flotation process

Abstract

The invention discloses an overall process method of a Fenton-like air-flotation process. The whole process method is divided into two sections: in a first stage: a main Fenton-like reaction is completed, organic pollutants in wastewater are oxidatively decomposed, a novel pure fluid static pipeline reactor is disposed in a water absorbing well or a water collecting well, a Fenton-like medicamentand a liquid caustic soda are added in the pipeline reactor, the Fenton-like medicament is thoroughly mixed and then the organic pollutants in the printing and dyeing wastewater are oxidatively decomposed, and the pH is adjusted by the liquid caustic soda; and in a second stage: completion of mud-water separation: the mixed liquid after the Fenton-like reaction enters an air flotation machine through a lift pump, the mud-water separation is completed with the aid of an air flotation auxiliary agent. The purpose of adding the PAM (Polyacrylamide) is to enable small particles in the mixed liquidto form floccules with larger particles through flocculation, and the thorough mud-water separation is facilitated. The process method not only absorbs the technical advantages of the traditional Fenton process and the air floatation process, but also solves the technical problems existing in the two conventional processes.

Description

technical field [0001] The invention relates to the technical field of industrial sewage treatment, in particular to an overall process method similar to the Fenton plus air flotation process. Background technique [0002] my country is a big country in textile printing and dyeing production, and the discharge of printing and dyeing wastewater is huge. Printing and dyeing wastewater usually refers to the comprehensive wastewater discharged from various printing and dyeing processes such as desizing wastewater, boiling wastewater, bleaching wastewater, mercerizing wastewater, dyeing wastewater, printing wastewater, soap wastewater and finishing wastewater. Although the water quality of printing and dyeing wastewater from various enterprises varies greatly due to different production materials and production processes, in general, printing and dyeing wastewater has five common features: high concentration of pollutants, refractory degradation, high chroma, high toxicity, and m...

AI Technical Summary

Problems solved by technology

[0005] At present, some enterprises adopt the traditional Fenton process for advanced treatment of printing and dyeing wastewater, which has a certain treatment effect, but the traditional Fenton process has the following disadvantages: first, the dosage of chemicals is large, the sludge output is large, and the treatment cost is high; second, the reaction efficiency is low, The reaction time is long, which generally takes more than 30 minutes; the third is that the traditional Fenton process occupies a large area (reaction tank, sedimentation tank, etc.), and the civil construction investment is relatively large; the fourth is that the traditional Fenton process sedimentation tank is easy to drift mud, mainly because of hydrogen peroxide Caused by drug overdose

In addition, some enterprises use the air flotation process to further treat printing and dyeing wastewater, and remove pollutants in the water by adding traditional flocculant combinations (PAC+PAM or PFS+PAM), but this process has the following shortcomings: First, COD, color The removal rate is low, and the discharge is often not up to standard; the second is that there is mud in the effluent, and the SS is high

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