Method and device for purifying cadmium in waste water through nano zero-valent iron

A nano-zero-valent iron and wastewater technology is applied in chemical instruments and methods, water/sewage treatment, adsorbed water/sewage treatment, etc. Effect

Active Publication Date: 2013-01-30
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a method and device for purifying cadmium in wastewater by nanometer zero-valen

Method used

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  • Method and device for purifying cadmium in waste water through nano zero-valent iron
  • Method and device for purifying cadmium in waste water through nano zero-valent iron
  • Method and device for purifying cadmium in waste water through nano zero-valent iron

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Such as image 3 As shown, the device is a two-stage reaction device, which is composed of a reaction chamber 1 and a separation chamber 2, and the reaction chamber 1 and the separation chamber 2 are semi-connected. A water inlet 3 is provided at the left bottom of the reaction chamber 1, and a nano-zero-valent iron return port is provided at the bottom, which is used to connect the nano-zero-valent iron return pipe 10. At the same time, a stirrer 4 is configured to fully and uniformly mix the wastewater and nano-zero-valent iron particles. reaction. The separation chamber 2 is divided into upper, middle and lower parts. The upper part is the water flowing out from the weir. After the water is discharged to the water outlet, it is discharged through the water outlet 12. The water outlet is covered with a layer of filter membrane 11 to intercept a small amount of nanometer zero-valent iron particles flowing out with the water. , the middle part is equipped with a slant ...

Embodiment 2

[0038]Using the device described in Example 1, the waste water is taken from river water with a certain metal cadmium content exceeding the standard, the cadmium concentration is 0.1 mg / L, and the pH of the water quality is in the range of 6.8-7.0. In this study, the volume ratio of the reaction chamber and the separation chamber of the secondary reaction device is designed to be 1.1:1, the hydraulic retention time is 60 min, the wastewater flow rate is 2-4 L / h, and the nano-zero-valent iron is added from the dosing well. 0.05-0.1 g / L, the reflux flow rate of nanometer zero-valent iron is twice that of the influent flow rate, and the dosing interval is 8 h. The cadmium-contaminated wastewater is fed from the water inlet of the reaction chamber, fully contacted with the nanometer zero-valent iron particles under the agitation of the agitator, and the pH and Eh of the mixed solution in the reaction chamber are monitored in real time. After sedimentation and separation of nanomet...

Embodiment 3

[0040] Using the device described in Example 1, in order to make the research effect more obvious, high-concentration cadmium-containing wastewater was prepared by adding standards, the influent cadmium concentration was 100 mg / L, and the pH was between 6.5-6.8. The volume ratio of the reaction chamber and the separation chamber of the secondary reaction device is designed to be 1.1:1, the hydraulic retention time is 60 min, the wastewater flow rate is 2-4 L / h, the nano-zero-valent iron is added from the dosing well, and the nano-zero-valent iron is refluxed The flow rate is 1-3 times of the water flow rate. This technological process studies the removal effect of several nanometer zero-valent iron dosages (10 g / L-20 g / L), and the dosage interval is 8 h. The cadmium-contaminated wastewater is fed from the water inlet of the reaction chamber, fully contacted with the nanometer zero-valent iron particles under the agitation of the agitator, and the pH and Eh of the mixed solutio...

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Abstract

The invention relates to a method and a device for purifying cadmium in waste water through nano zero-valent iron, and the cadmium-contained waste water refers to the waste water with severe pollution and needing to be purified in the production and application field of smelting and different cadmium compounds. By adopting the nano technology, a great amount of cadmium elements in the waste water is purified and removed by utilizing nano zero-valent iron through a continuous flow secondary reaction device. Water is discharged in a weir flow way after the waste waster flows by a secondary treatment device consisting of a reaction chamber and a separation chamber, the waste water is adequately contacted and reacted with the nano zero-valent iron particles through the electric blending inside the reaction chamber, the nano zero-valent iron particles are promoted to precipitate by utilizing an oblique plate inside the separation chamber so as to be separated from the waste water, and the precipitated nano zero-valent iron backflows to the reaction chamber to be circulated. A layer of filter membrane is paved on a water outlet of a weir flow water outlet groove so as to filter the nano zero-valent iron particles which are not completely precipitated in the water. The process flow for removing cadmium pollutant in the waste water is simple, the cost is low, convenience in operation is achieved, the treatment effect is good, and no secondary pollution is caused.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method and a device for purifying cadmium in wastewater by nanometer zero-valent iron. Background technique [0002] Cadmium, which is located in the fifth cycle and forms group IIB (zinc group) with zinc and mercury, is a sulfur-friendly element, and exists mainly in zinc ore in the form of sulfide in nature. Cadmium is a common pollutant in water. Cadmium pollutants in water mainly come from the mining and smelting of cadmium-containing minerals, the production and application of various cadmium compounds. Cadmium and its various compounds are widely used as raw materials or catalysts for the production of plastics, pigments and reagents; due to the corrosion resistance and friction resistance of cadmium, it is also a raw material for the production of stainless steel, electroplating, and radar, TV fluorescent screens, etc.; It is also one of the...

Claims

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Application Information

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IPC IPC(8): C02F1/62C02F1/28C02F1/70
Inventor 张伟贤张亚雷李钰婷代朝猛
Owner TONGJI UNIV
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