Method for treating methylene blue dye wastewater

Abstract

The invention relates to a method for treating methylene blue dye wastewater. Firstly, diatomite is evenly mixed with calcium raw materials, alkali activator and water, and is put in a high-pressure hydrothermal reaction kettle after the compression molding to react for 1-48 hours at the temperature of 100-200 DEG C to obtain a diatomite-based porous adsorbent containing C-S-H, tobermorite and analcite; then, the diatomite-based porous adsorbent is put in a conical bottle accommodated with a liquid culture medium; 5-20% of yeast powder by mass is added to regulate the pH to be 5-8 and to cultivate for 2-48 h under the constant-temperature condition of 15-35 DEG C on a reciprocal shaking table with the speed of 60-120 rpm so as to obtain a yeast-loaded diatomite-based porous adsorbent; finally, 1-10 g of the yeast-loaded porous adsorbent is added in the methylene blue dye wastewater with per liter concentration of 100-1000 mg / L to treat for 1-48 h at the temperature of 25-45 DEG C on the reciprocal shaking table with the pH of 4 to 10 and the speed of 60-120 rpm; the concentration of the treated methylene blue wastewater is measured through a spectrophotometer method; the result shows that the removal rate of the methylene blue dye exceeds 90%. The method has the advantages of simple process, low cost and no secondary pollution, and is suitable for the industrial treatment of the methylene blue dye wastewater.

Description

technical field

[0001] The invention relates to a method for treating methylene blue dye wastewater, in particular loading yeast on a hydrothermally solidified diatomite-based porous adsorbent to treat methylene blue dye wastewater, and belongs to the technical field of dye wastewater treatment. Background technique

[0002] With the continuous development of dye and dyeing industry, organic dye wastewater has become one of the main sources of water pollution. Dye wastewater has complex components and a large content of organic matter, and most of them exist in the form of aromatic groups such as benzene, naphthalene, anthracene, and quinone. They have the characteristics of deep color, strong toxicity, and refractory degradation. serious threat. At the same time, when the dye-containing wastewater enters natural waters, due to the deep color of the dye, a very small content will produce a very significant color, resulting in color pollution of the water body, which will no...

Examples

Embodiment 1

[0036] In the first step, mix 3g of diatomite dried and passed through a 80-mesh sieve, 1g of commercially available industrial grade calcium hydroxide, and 1ml of deionized water, and mix the mixture with a W270×D200 ×H450 specification tablet press, press molding at 20MPa, demould, obtain the sample after molding. Put the sample into a high-pressure hydrothermal kettle, control the reaction temperature to 200°C, and the reaction time to 24h. The sample obtained after the hydrothermal reaction is detected by X-ray diffraction analysis method as follows: figure 2Shown: figure 2 (1) is the XRD pattern of diatomite raw material, (2) is the XRD pattern of C-S-H after hydrothermal synthesis. It can be seen from the figure that the main components of diatomite raw material are quartz (Quartz) and montmorillonite (Montomorillonite), after hydrothermal synthesis, the composition of the obtained diatomite-based porous adsorbent retains the original diatomite (quartz), and generates...

Embodiment 2

[0044] The first step, the diatomite of embodiment 1, 2.15g calcium hydroxide, 0.5g sodium hydroxide, 1.5ml deionized water are mixed evenly, and the mixture is compressed with 15MPa under the tablet press; The samples were placed in a high-pressure hydrothermal kettle for reaction. The reaction temperature is controlled at 175°C, and the reaction time is 12 hours. The samples obtained after the hydrothermal reaction are tested as follows: image 3 , where (1) is the XRD pattern of diatomite raw material, (2) is the XRD pattern of diatomite-based porous adsorbent after hydrothermal synthesis, from image 3 It can be seen that the main components of diatomite raw materials are quartz and montmorillonite. After hydrothermal synthesis, the diatomite-based adsorbent obtained has the original diatomite (quartz) in its composition. The optimized mineral tobermullite was generated. The structure seen by the scanning electron microscope is as follows Image 6 As shown, tobomullite ...

Embodiment 3

[0048] In the first step, 3 g of dried diatomite, 0.9 g of calcium hydroxide, 0.4 g of sodium hydroxide and 1.3 ml of deionized water are uniformly mixed, and the mixture is pressed into shape under a tablet machine at 30 MPa; The molded sample was placed in a high-pressure hydrothermal kettle, and 1 / 7 of the volume of deionized water was added to the reaction kettle, so that the sample did not directly contact with the water. The reaction temperature is controlled at 200°C, and the reaction time is 24 hours. The sample obtained after the hydrothermal reaction is detected as an analcite diatomite-based porous adsorbent, please see Figure 4 , Figure 4 The XRD pattern of diatomite-based adsorbent and diatomite optimized for hydrothermal synthesis of analcime, where (1) is the XRD pattern of diatomite raw material, (2) is the XRD pattern of diatomite-based adsorbent after hydrothermal synthesis From the XRD diagram, it can be seen from the figure that the main components of di...

technical field

[0001] The invention relates to a method for treating methylene blue dye wastewater, in particular loading yeast on a hydrothermally solidified diatomite-based porous adsorbent to treat methylene blue dye wastewater, and belongs to the technical field of dye wastewater treatment. Background technique

[0002] With the continuous development of dye and dyeing industry, organic dye wastewater has become one of the main sources of water pollution. Dye wastewater has complex components and a large content of organic matter, and most of them exist in the form of aromatic groups such as benzene, naphthalene, anthracene, and quinone. They have the characteristics of deep color, strong toxicity, and refractory degradation. serious threat. At the same time, when the dye-containing wastewater enters natural waters, due to the deep color of the dye, a very small content will produce a very significant color, resulting in color pollution of the water body, which will no...

Examples

Embodiment 1

[0036] In the first step, mix 3g of diatomite dried and passed through a 80-mesh sieve, 1g of commercially available industrial grade calcium hydroxide, and 1ml of deionized water, and mix the mixture with a W270×D200 ×H450 specification tablet press, press molding at 20MPa, demould, obtain the sample after molding. Put the sample into a high-pressure hydrothermal kettle, control the reaction temperature to 200°C, and the reaction time to 24h. The sample obtained after the hydrothermal reaction is detected by X-ray diffraction analysis method as follows: figure 2Shown: figure 2 (1) is the XRD pattern of diatomite raw material, (2) is the XRD pattern of C-S-H after hydrothermal synthesis. It can be seen from the figure that the main components of diatomite raw material are quartz (Quartz) and montmorillonite (Montomorillonite), after hydrothermal synthesis, the composition of the obtained diatomite-based porous adsorbent retains the original diatomite (quartz), and generates...

Embodiment 2

[0044] The first step, the diatomite of embodiment 1, 2.15g calcium hydroxide, 0.5g sodium hydroxide, 1.5ml deionized water are mixed evenly, and the mixture is compressed with 15MPa under the tablet press; The samples were placed in a high-pressure hydrothermal kettle for reaction. The reaction temperature is controlled at 175°C, and the reaction time is 12 hours. The samples obtained after the hydrothermal reaction are tested as follows: image 3 , where (1) is the XRD pattern of diatomite raw material, (2) is the XRD pattern of diatomite-based porous adsorbent after hydrothermal synthesis, from image 3 It can be seen that the main components of diatomite raw materials are quartz and montmorillonite. After hydrothermal synthesis, the diatomite-based adsorbent obtained has the original diatomite (quartz) in its composition. The optimized mineral tobermullite was generated. The structure seen by the scanning electron microscope is as follows Image 6 As shown, tobomullite ...

Embodiment 3

[0048] In the first step, 3 g of dried diatomite, 0.9 g of calcium hydroxide, 0.4 g of sodium hydroxide and 1.3 ml of deionized water are uniformly mixed, and the mixture is pressed into shape under a tablet machine at 30 MPa; The molded sample was placed in a high-pressure hydrothermal kettle, and 1 / 7 of the volume of deionized water was added to the reaction kettle, so that the sample did not directly contact with the water. The reaction temperature is controlled at 200°C, and the reaction time is 24 hours. The sample obtained after the hydrothermal reaction is detected as an analcite diatomite-based porous adsorbent, please see Figure 4 , Figure 4 The XRD pattern of diatomite-based adsorbent and diatomite optimized for hydrothermal synthesis of analcime, where (1) is the XRD pattern of diatomite raw material, (2) is the XRD pattern of diatomite-based adsorbent after hydrothermal synthesis From the XRD diagram, it can be seen from the figure that the main components of di...

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