A printing and dyeing wastewater treatment process with enhanced internal circulation of muddy water

Abstract

The invention relates to a printing and dyeing wastewater treatment process for intensifying the internal circulation of sludge water and relates to printing and dyeing wastewater treatment and sludge recycling. According to the printing and dyeing wastewater treatment process, printing and dyeing wastewater is collected into a wastewater collection tank, the printing and dyeing wastewater is divided into three parts which are respectively pumped into an acidifying reaction tank, a neutralization reaction tank and a regulation tank, the wastewater inside the neutralization reaction tank automatically flows into a sedimentation tank, sediment wastewater automatically flows into the regulation tank, and a part of the wastewater is pumped into the regulation tank when the pH of the regulation tank is lower than 6.5 so that the pH of the wastewater inside the regulation tank is higher than 6.5; a part of sludge inside the regulation tank returns into the acidifying reaction tank and the neutralization reaction tank; the wastewater inside the regulation tank is pumped into a hydrolysis acidification tank and then automatically flows into an intermediate tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank sequentially; a part of sludge inside the secondary sedimentation tank returns into the regulation tank, the anoxic tank, the aerobic tank and the neutralization reaction tank; the wastewater inside the secondary sedimentation tank automatically flows into a transition tank and a coagulation tank, the wastewater automatically flows into a final sedimentation tank after coagulation reaction, the sludge inside the final sedimentation tank returns to the neutralization reaction tank, and the wastewater inside the final sedimentation tank is discharged; the sludge inside the sedimentation tank is concentrated or directly subjected to pressure filtration or subjected to the pressure filtration after being digested by being pumped into a sludge digestion tank, and effluent water of the sludge digestion tank is discharged into the regulation tank.

Description

technical field [0001] The invention relates to printing and dyeing wastewater treatment and sludge recycling, in particular to a printing and dyeing wastewater treatment process in which muddy water strengthens internal circulation. Background technique [0002] Printing and dyeing wastewater generally includes cotton and cotton blended printing and dyeing wastewater, wool printing and dyeing wastewater, wool washing wastewater, silk dyeing and finishing wastewater, silk spinning and refining wastewater, silk reeling wastewater, hemp printing and dyeing wastewater, chemical fiber printing and dyeing wastewater, batik process wastewater, etc. The B / C of polyvinyl alcohol (PVA) slurry and dyes in common printing and dyeing wastewater is small, and the biodegradability is poor, which affects the discharge of COD and chroma in the wastewater. Auxiliaries, surfactants, temperature, chroma, alkalinity, etc. Affect microbial activity and wastewater regeneration and reuse. [0003...

AI Technical Summary

Problems solved by technology

Ozone oxidation in chemical oxidation is a better method of decolorization but the cost is higher. Fenton’s reagent is better but the amount of sludge is large. Sodium hypochlorite is a lower cost decolorant that can initiate and accelerate the cleavage of azo bonds but is prone to carcinogenicity. Aniline and other toxic substances

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