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Method for removing cadmium ions in heavy metal wastewater

A technology for cadmium ions and heavy metals, which is applied in the field of removing cadmium ions in heavy metal wastewater, can solve the problems of resource waste and high cost, and achieve the effect of no secondary pollution and self-driven operation

Inactive Publication Date: 2018-12-21
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many ways to treat cadmium-containing heavy metal wastewater, simple treatment will consume high costs and cause waste of resources

Method used

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  • Method for removing cadmium ions in heavy metal wastewater
  • Method for removing cadmium ions in heavy metal wastewater
  • Method for removing cadmium ions in heavy metal wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Effect of MEC cathode material on the treatment of cadmium-containing wastewater by MFC-MEC coupling system

[0038] Change the cathode material of MEC: the cathode material of the first group is stainless steel, the cathode material of the second group is titanium plate, and the cathode material of the third group is carbon paper, and three sets of coupling devices are constructed. Both MFC and MEC have an effective volume of 500mL, the distance between the anode and cathode of MFC and MEC is 8cm, the volume ratio of activated sludge to substrate is 1:4; the copper ion concentration of MFC catholyte is 1280mg / L, and the conductivity is 5mS / cm, pH value is 5; MEC catholyte cadmium ion concentration is 985mg / L, pH value is 4.9. When the MFC output voltage is 700mV, the MEC and MFC are connected in series. The coupling system operates at normal temperature and pressure. When the cathode material is a titanium plate, the removal rate of cadmium ions in the MEC ...

Embodiment 2

[0039] Example 2: Effect of pH of MEC catholyte on treatment of cadmium-containing wastewater by MFC-MEC coupling system

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Abstract

The invention discloses a method for removing cadmium ions in heavy metal wastewater, which uses electric energy generated by microbial fuel cell degraded organic matter to drive a microbial electrolysis cell to treat cadmium-containing heavy metal wastewater, does not consume external electric energy or generate secondary pollution during the whole process, and is an environment-friendly new method for treatment of cadmium-containing heavy metal wastewater. The method comprises the following three steps: 1, determination of MFC operating parameters; 2, construction of an MFC-MEC self-driven coupling system; and 3, treatment of the cadmium-containing heavy metal wastewater, wherein through the steps 1 and 2, the cadmium-containing heavy metal wastewater is treated through MEC cathodic reaction, catholyte is the cadmium-containing heavy metal wastewater, the pH value is 1-5, carbon paper is used as anode, and stainless steel, a titanium plate and carbon paper are used as cathode material. After the end of MEC reaction, the cathode is taken out and an MEC cathode reduction product is collected. XRD detection proves that the MEC cathode reduction product is cadmium carbonate and the cadmium ion removal rate is 89.5%.

Description

technical field [0001] The invention relates to the fields of bioelectrochemistry and heavy metal wastewater treatment, in particular to a method for removing cadmium ions in heavy metal wastewater. Background technique [0002] With the rapid development of my country's economy, the process of industrialization has been accelerated, and people's living standards have been greatly improved, but it has also brought about the problem of water environment pollution. In the industrial production process of electroplating, metallurgy, chemical industry, etc., a large amount of wastewater will be produced. The composition of the wastewater is complex. In addition to refractory organic pollutants, it also contains a large amount of toxic and harmful heavy metal substances. If this type of wastewater is not handled properly, It will cause great harm to ecology, environment and human health. [0003] Cadmium in waste water is highly toxic and is easily absorbed by the human body. Ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00C02F101/20
CPCC02F3/005C02F2101/20
Inventor 刘维平潘璐璐吴丹菁梁国斌陈娴路娟娟
Owner JIANGSU UNIV OF TECH
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