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A low-cost method for rapid and deep degradation of organic dye wastewater

An organic dye, low-cost technology, applied in energy wastewater treatment, light water/sewage treatment, oxidized water/sewage treatment, etc., can solve problems such as unsatisfactory treatment effect, high energy consumption demand, and complex reaction equipment requirements. Achieve the effect of solar cost optimization, strong applicability, degradation efficiency and cost control improvement

Active Publication Date: 2017-11-21
SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It can be seen that the existing organic dye wastewater treatment process requires relatively high energy consumption and relatively complicated requirements for reaction equipment, and the above two dye wastewater degradation methods based on sodium bismuthate (i.e. sodium bismuthate rapid oxidation method and Sodium bismuthate solar photocatalytic mineralization method) has its own advantages and disadvantages, and the effect of using one of them alone is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Prepare 60mg / L crystal violet aqueous solution to simulate dye wastewater (the solution does not need to remove impurities, and the pH value is in the range of 6-11), and measure 200mL into the process (B) reactor. Weigh 0.15g of sodium bismuthate and 0.05g of silver nitrate to react to synthesize bismuth-silver oxide, and put it into a reactor to start the reaction under stirring. After reacting for 45 minutes, the decolorization rate and mineralization rate of the crystal violet solution under direct oxidation were measured.

[0023] Prepare a 60mg / L crystal violet aqueous solution to simulate dye wastewater, and take 200mL of the same amount and put it into the process (C) reactor. Weigh 0.15g of sodium bismuthate (0.75g / L) and mix it with the dye solution and react under sunlight for 45min to measure the decolorization rate and mineralization rate of the crystal violet solution under the catalysis of sunlight.

[0024] Finally, a crystal violet solution of the same...

Embodiment 2

[0027]Prepare 100mg / L saffron red aqueous solution to simulate dye wastewater (the solution does not need to remove impurities, and the pH value is within the range of 6-11), and measure 200mL of dye solution into the process (B) reactor. The reactor can be any simple container in which a stirring bar is placed to stir the solution under the action of the stirrer. Weigh 0.15g of sodium bismuthate and 0.05g of silver nitrate to synthesize bismuth-silver oxide, and put it into a reactor to start the reaction under the action of stirring. After 20min of the direct oxidation process, the dye solution has been basically decolorized. The decolorized waste water is all transferred to the process (C) reaction vessel after centrifugation. Weigh 0.15g of sodium bismuthate (0.75g / L) and put it into the above solution. After fully mixing under the action of stirring, the dye solution is further deeply degraded by sunlight irradiation, and the reaction in this step is carried out for 80 m...

Embodiment 3

[0031] Prepare 65mg / L alizarin red aqueous solution to simulate dye wastewater (the solution does not need to remove impurities, and the pH value is within the range of 6-11). Measure 200mL of the dye solution into the process (B) reactor, in which a stirring bar is placed, and the solution is stirred under the action of the stirrer. Synthesize bismuth-silver oxide according to the weight ratio of sodium bismuthate:silver nitrate of 3.5:1, weigh 0.2g of synthesized bismuth-silver oxide and put it into a reactor to start the reaction under the action of stirring. After 15 minutes of direct oxidation, the dye solution has been basically decolorized. The decolorized waste water is all transferred to the process (C) reaction vessel after centrifugation. Weigh 0.3g of sodium bismuthate (1.5g / L) and put it into the above solution. After fully mixing, the dye solution is further degraded by sunlight irradiation, and the reaction in this step is carried out for 70 minutes. The detec...

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Abstract

The invention discloses a method for quickly and deeply degrading organic dye wastewater at low cost. The method is as follows: (A) the grid removes impurities, stands still for precipitation, and adjusts the pH value to 6-11; (B) after the wastewater is introduced into the reaction vessel, add bismuth-silver oxide synthesized by sodium bismuthate and silver nitrate, and stir Keep multi-phase homogeneous mixed reaction under low temperature, room temperature, pressure and normal pressure, the wastewater is basically decolorized and then centrifugally discharged; (C) The effluent from the upper section is introduced into another reaction vessel, and sodium bismuthate is added at 0.75 ~ 2g / L, and stirred under sunlight reaction, and the treated waste water is discharged; the bismuth-silver oxide is synthesized according to the weight ratio of sodium bismuthate: silver nitrate (2.5-3.5):1. The present invention adopts the two-step combined method of rapid oxidation of sodium bismuthate and sodium bismuthate to catalyze sunlight mineralization to treat dye wastewater, and can achieve the goals of decolorization, degradation and mineralization of dye wastewater in a short time, wherein the synthesis ratio of bismuth-silver oxide It is optimized to use sunlight for deep degradation, and the cost is lower. At the same time, the photocatalytic efficiency of sodium bismuthate is improved.

Description

Technical field: [0001] The invention belongs to the technical field of dye wastewater treatment, and relates to a method for treating organic dye wastewater, in particular to a low-cost method for rapidly and deeply degrading organic dye wastewater. Background technique: [0002] With the development of printing and dyeing and dye industry, the annual output of dyes in the world is about 800,000 to 900,000 tons, and the annual output of dyes in my country reaches 150,000 tons, ranking in the forefront of the world (The hazards of printing and dyeing wastewater and source control measures, Zhu Hongfei, Environmental Science and Management, 2007). There are many kinds of dye compounds, most of which are organic dyes, which are widely used in various technical fields, involving various branches including: leather industry, paper making, food technology, agriculture, light array, photoelectrochemical cell, etc. The large-scale production and use of dyes have caused serious poll...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F1/30
CPCY02W10/37
Inventor 喻恺罗启仕孙成杨绍贵
Owner SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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