Treatment method of thallium-containing wastewater

A treatment method and wastewater technology, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of insufficient utilization of active sites, limited adsorption capacity, regeneration Ineffective and other problems, to achieve the effect of good renewability and recyclability, low cost, and easy large-scale promotion and application

Inactive Publication Date: 2021-06-18
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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Problems solved by technology

[0004] However, the manganese ferrite and other metal oxide particles used in the above technical solutions are used as adsorbents, which can more effectively adsorb and remove thallium through ion exchange, but in the actual application process, metal oxide particles will be agglomerated Phenomena, the specific surface area is small, the active sites are not fully utilized, so there are problems such as limited adsorption capacity, large usage, and separation difficulties after adsorption saturation, and poor regeneration effect. Restricted its application promotion on

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  • Treatment method of thallium-containing wastewater

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Embodiment 1

[0054] See attached Figure 1~14 , This embodiment is to treat a sample of thallium-containing industrial wastewater from a certain enterprise, so as to test and verify the performance of the present invention and the material of the magnetic adsorbent, such as recyclability, removal rate, and removal speed. The adsorption experiment conditions were that the initial concentration of Tl(I) in water was 10 mg / L, the pH of the solution was 7.0, and rGO-Fe 3 o 4 @TiO 2 The amount of magnetic adsorbent is 50mg, the adsorption time is 0.5h, and the temperature is 25±1°C.

[0055] The treatment method of the thallium-containing wastewater provided by the present embodiment comprises the following steps:

[0056] A) Preparation of magnetic adsorbent rGO-Fe, respectively 3 o 4 @TiO 2 (reduced graphene oxide nanocomposite material), persulfate PS (specifically select potassium persulfate in this embodiment);

[0057] B) Obtain a sample of thallium-containing wastewater, determine...

Embodiment 2

[0089] The treatment method of the thallium-containing wastewater provided by the embodiment of the present invention is basically the same as that of Example 1, except that the initial concentration of Tl in the thallium-containing wastewater in this embodiment is 56 µg / L, the pH is 5.6, and the rGO -Fe 3 o 4 @TiO 2 The dosage was 0.1g / L, and the dosage of PS was 10mM. Samples were taken at 5, 10, 15, 20, and 30 minutes respectively to analyze the treatment performance. The test results showed that at 10 minutes, rGO-Fe 3 o 4 @TiO 2 The removal efficiency of Tl in wastewater is 96%. The material can be quickly separated by an external magnetic field, which shows that the material can quickly and efficiently remove Tl in wastewater, and is easy to separate. It can be used for the treatment of thallium-containing wastewater and the emergency treatment of thallium. Disposal.

[0090] The magnetic adsorbent rGO-Fe 3 o 4 @TiO 2 (reduced graphene oxide nanocomposite materia...

Embodiment 3

[0095] The treatment method of the thallium-containing wastewater provided by the embodiment of the present invention is basically the same as that of Examples 1 and 2, except that:

[0096] This embodiment deals with 1m 3 Thallium-containing wastewater, the pH of which is 7, the initial concentration of Tl in the wastewater is 56 µg / L, the calculated rGO-Fe 3 o 4 @TiO 2 The dosage is 150g, and the dosage of PS is 240g; after testing, within 10min, rGO-Fe 3 o 4 @TiO 2 The removal efficiency of Tl in wastewater was 96%, within 30min, rGO-Fe 3 o 4 @TiO 2 The removal efficiency of Tl in wastewater is 98wt%, and the concentration of Tl in the treated water is 1.12µg / L, meeting the "Discharge Standard for Thallium Pollutants in Industrial Wastewater" (DB44 / 1989-2017).

[0097] The magnetic adsorbent rGO-Fe 3 o 4 @TiO 2 The preparation method, it specifically comprises the steps:

[0098] 1. Preparation of rGO

[0099] The reduced graphene oxide rGO nanosheets were syn...

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Abstract

The invention discloses a treatment method of thallium-containing wastewater. The method comprises the following steps: A) respectively preparing magnetic adsorbents rGO-Fe3O4@TiO2 and PS; B) obtaining a thallium-containing wastewater sample, and measuring the concentration and pH value of thallium in the sample; C) calculating and verifying the optimal adding amount of the rGO-Fe3O4@TiO2 and PS; D) adding rGO-Fe3O4-coated TiO2 and PS into the wastewater according to the optimal adding amount. The rGO-Fe3O4@TiO2 material effectively activates PS to generate SO4 free radicals through -COOH groups of the rGO-Fe3O4@TiO2 material and Fe (II) in magnetic particles, Tl (I) is quickly adsorbed and oxidized into Tl (III), the Tl (III) is precipitated, and the Tl (I) in wastewater is efficiently removed. According to the invention, a novel magnetic adsorbent is adopted, and is a composite structure rGO-Fe3O4@TiO2 formed by taking Fe3O4 as a core, coating core-shell solid particles with TiO2 nanoparticles on the surface, taking an rGO nanosheet with mesopores as a carrier and combining the core-shell solid particles and the carrier with the nanosheet. According to the thallium-containing wastewater treatment method provided by the invention, the adopted adsorbents are few in variety and total amount, high in thallium adsorption capacity, large in capacity, high in efficiency, low in cost and easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to an efficient and rapid treatment method for thallium-containing wastewater. Background technique [0002] The emission sources of thallium pollution mainly include natural and man-made emission sources. It is generally believed that 0.2-2ppm concentration of thallium will cause pollution, while the total content of thallium in the natural environment is very low, the concentration is as low as 1bbp, and high concentrations of thallium in some local areas will cause harm; for example, containing Near the sphalerite mine of thallium minerals, in the exhaust gas after burning solid waste containing thallium. Low levels of thallium can cause serious harm to the ecosystem; thallium is extremely toxic to the human body, and thallium will inactivate the potassium ion transport pump protein on the cell membrane, disrupt the metabolic function of the human body, ...

Claims

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Application Information

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IPC IPC(8): C02F9/04B01J20/20B01J20/28C02F101/20
CPCB01J20/205B01J20/28009C02F1/281C02F1/722C02F2101/20
Inventor 于云江李良忠马瑞雪刘畅阳宸煜李宗睿常兆峰谭海萍
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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