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sewage treatment method

A sewage treatment method and waste water technology, applied in the direction of water/sewage treatment, water/sewage multi-stage treatment, neutralized water/sewage treatment, etc., can solve the problems of high cost and difficult treatment, with simple method and low cost , to promote the effect of sedimentation

Active Publication Date: 2021-01-26
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing Cr(Ⅵ)-containing wastewater and cationic organic dye wastewater are difficult and costly to treat.

Method used

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Experimental program
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Embodiment 1

[0031] Embodiment 1: the processing of Cr (Ⅵ) and methylene blue mixed wastewater

[0032] (1) Mix the chromium-containing wastewater with the dye wastewater, and adjust the amount of Cr in the mixed wastewater. 6+ The concentration is 400mg / L, and the concentration of methylene blue (MB) is 2000mg / L;

[0033] (2) Add NaCl to the mixed wastewater to adjust the NaCl concentration to about 50mg / L;

[0034] (3) adjust the pH of the mixed wastewater to be about 4, stir with a stirrer for 5 minutes at a speed of 1200 rpm, and then stir for 3 minutes at a speed of 400 rpm;

[0035] (3) get the solution after the reaction to measure the concentration of methylene blue and hexavalent chromium (removal rate such as figure 2 shown).

[0036] (4) Adding an adsorption-promoting flocculation compound agent to the reacted solution;

[0037] (5) The reacted mixed solution is passed through a small sedimentation tank simulated in the laboratory to remove the sediment and activated carbon...

Embodiment 2

[0038] Embodiment 2: the treatment of Cr (Ⅵ) and methylene blue mixed wastewater

[0039] Adopt the method of embodiment 1, difference is: adjust the Cr in the mixed waste water of step (1) 6+ The concentration is 400mg / L, and the concentration of methylene blue (MB) is 1600mg / L.

Embodiment 3

[0040] Embodiment 3: the treatment of Cr (Ⅵ) and methylene blue mixed wastewater

[0041] Adopt the method of embodiment 1, difference is: adjust the Cr in the mixed waste water of step (1) 6+ The concentration is 400mg / L, and the concentration of methylene blue (MB) is 1400mg / L.

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Abstract

The invention relates to the technical field of sewage treatment, in particular to a sewage treatment method; specifically, after mixing and reacting chromium-containing wastewater and cationic dye-containing wastewater, the precipitation treatment is carried out; the invention provides a method capable of simultaneously treating Cr(Ⅵ)-containing wastewater and The sewage treatment method of cationic organic dye wastewater, under the pH condition lower than the dye wastewater, Cr in the wastewater 6+ The solution is mixed with the cationic dye solution, and a redox reaction occurs to produce Cr(OH) 3 The precipitate was removed by filtration. Adsorption-promoting flocculation complex agent can further adsorb pollutants and promote sedimentation, so that dyes and Cr in wastewater can be removed 6+ . The method provided by the invention is simple and low in cost, can be used as a pretreatment method in the water treatment process, and provides a new idea for sewage treatment.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a sewage treatment method. Background technique [0002] Wastewater containing Cr(Ⅵ) and cationic organic dyes has a large amount of discharge, strong complexity, and wide sources, which are the key and difficult points in the field of industrial wastewater treatment in my country. Among them, Cr(Ⅵ) is widely used in industries such as leather, textile, printing and dyeing, electroplating, stainless steel, battery, metallurgy and ore mining, and the chromium pollution generated during its production and use has persistence, enrichment, toxicity and carcinogenicity. , which poses a serious health threat to animals. The current regulations in my country stipulate that the detection limit of hexavalent chromium should not exceed 0.05mg / L. Cationic organic dyes are widely used in textile, leather, paper and plastic industries. The printing and dyeing wastewater produced by t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/22C02F101/30
CPCC02F1/001C02F1/281C02F1/283C02F1/5236C02F1/62C02F1/66C02F9/00C02F2101/22C02F2101/308
Inventor 黄青吴茜冉张启富
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI