System for treating antimony-containing printing and dyeing sewage

Abstract

The invention discloses a system for treating antimony-containing printing and dyeing sewage. The system mainly comprises a regulating tank, a cooling tower, a primary sedimentation tank, an aerobic tank, a second sedimentation tank, an immersing-type ultrafiltration MCR tank, a reverse osmosis membrane system, a final sedimentation tank and an outer drainage tank which are used for collecting theprinting and dyeing sewage and connected sequentially through pipelines, wherein a PAC agent is added into the primary sedimentation tank so as to perform a flocculation reaction, and microorganismsare adsorbed in the aerobic tank; after sedimentation, the treated sewage is discharged from a sludge treatment system, so that the total amount of antimony in the sewage is reduced, and the application amount of a PAFC reagent which is used in a terminal process of mixing and sedimentation; RO concentrate is generated through the immersing-type ultrafiltration MCR tank and the reverse osmosis membrane system so as to achieve the concentration and enrichment of the antimony element and thus reduce the amount of sewage for antimony removing treatment, so that the efficiency of utilization of the PAFC reagent is improved, the generated RO clean water can be reused in a workshop, and therefore requirements for the reuse of reclaimed water by a printing and dyeing company are met.

Description

technical field [0001] The invention is a sewage treatment system, more specifically, it is a printing and dyeing (antimony-containing) sewage treatment system that improves the antimony removal efficiency of PAFC chemicals by optimizing the process flow of the traditional sewage treatment system. Background technique [0002] With the development of printing and dyeing technology, the antimony (Sb) heavy metal element in the textile printing and dyeing process has attracted widespread attention due to its strong toxicity and carcinogenic effect. In textile printing and dyeing, terephthalic acid Synthesis with ethylene glycol requires the use of antimony-containing catalysts, such as antimony acetate and antimony glycol, which are more efficient and economical among current catalysts, and can almost help achieve a 100% conversion rate, but when enjoying its high conversion rate At the same time, the antimony element in the synthesis process will be evenly dispersed in the po...

AI Technical Summary

Problems solved by technology

Although there are currently many methods that can effectively remove total antimony, such as chemical precipitation, electrochemical methods, ion exchange methods, etc., they are often based on experiments, with single considerations and divorced from actual production, which ultimately leads to actual operating costs. High, which virtually increases the environmental burden of the enterprise

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