Treatment system for chromium-containing dyeing wastewater and implementation method thereof

Abstract

The invention discloses a treatment system for chromium-containing dyeing wastewater and an implementation method thereof. The treatment system consists of a wastewater collection bucket, a three-dimensional electrolytic reaction tank, a 1# Ph regulating tank, an advanced oxidation decolorization tank, a reduction tank, a 2# Ph regulating tank, a flocculation sedimentation tank, a filter, an ion adsorption device and a sludge press. The treatment system for chromium-containing dyeing wastewater has a simple structure, and adopts the three-dimensional electrolysis, advanced oxidation decolorization, coagulation and ion exchange combined technology, after chromium-containing dyeing wastewater is treated by the wastewater collection bucket, the three-dimensional electrolytic reaction tank, the 1# Ph regulating tank, the advanced oxidation decolorization tank, the reduction tank, the 2# Ph regulating tank, the flocculation sedimentation tank, the filter and the ion adsorption device in order, the treated wastewater has a total chromium content of less than 0.5mg / L and a Cr<6+> content of less than 0.1mg / L that both reach the electroplating sewage discharge requirements specified in Table 3-3 of "GB 21900-2008", thus ensuring that the effluent water can achieve up-to-stand discharge and meet the reuse requirements. Also, the treatment process has strong impact load resistance.

Description

Technical field [0001] The invention relates to the technical field of electroplating dyeing wastewater, in particular to a treatment system for chromium-containing dyeing wastewater and an implementation method thereof. Background technique [0002] In metal processing, electroplating, tanning and other industries, a series of dyeing wastewater will produce a large amount of dyeing wastewater. Due to high COD, total nitrogen and total phosphorus, this type of wastewater is generally poor in biodegradability, high in color, and direct discharge will undoubtedly cause a huge environment harm. In addition, due to the widespread use of heavy metal-containing dyes, there is no doubt that this type of wastewater contains a large amount of heavy metal pollutants, of which chromium is the most toxic and the most difficult to treat. Since chromium belongs to the first type of priority control pollutant, the national environmental protection standards require separate chromium removal tr...

AI Technical Summary

Problems solved by technology

Among them, the chemical method needs to add an excessive amount of chemicals, which is easy to cause secondary pollution, and produces a large amount of sludge

The ion exchange method uses polymer synthetic resin to exchange chromium in wastewater, which has high cost, complicated operation and management, and difficult resin regeneration and short service life.

Membrane separation methods include electrodialysis, reverse osmosis, and electrodeionization. These methods currently have problems with membrane life and cost, and are still in the research and trial stage. Electrolysis is because of its small size, small footprint, low power consumption, and convenient management , good effect and other characteristics are widely used, but it is difficult to meet the discharge standard by purely using electrolysis technology to treat chromium-containing wastewater. For wastewater with low chromium concentration, the energy consumption will rise linearly.

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