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Method for removing EDTA-Pb by using iron salt-desulfurization gypsum system

A technology for desulfurization of gypsum and iron salts, applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage treatment, etc., can solve the problem of limited removal rate of metal chelate compounds, etc., and is beneficial to subsequent engineering applications , The effect of good application prospect and wide source of raw materials

Inactive Publication Date: 2018-12-18
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The other is a method that does not destroy organic matter. The most typical is adsorption and membrane separation. Their removal rate of metal chelates is limited, and it is far from satisfactory. Zhen H et al. use heavy metal scavenger DTC (dithio Carbamate) directly adsorbs EDTA-Cu, and the adsorption capacity is only 34mg / g (Zhen H B, et al.Characteristics of heavy metals capturing agent dithiocarbamate (DTC) for treatment of ethylene diamine tetraacetic acid–Cu(EDTA–Cu) contaminated wastewater[J ].Chemical Engineering Journal,2012,209(20):547-557.)

Method used

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  • Method for removing EDTA-Pb by using iron salt-desulfurization gypsum system
  • Method for removing EDTA-Pb by using iron salt-desulfurization gypsum system
  • Method for removing EDTA-Pb by using iron salt-desulfurization gypsum system

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1: The difference between the iron salt-desulfurization gypsum system and the use of iron salt and desulfurization gypsum respectively

[0025] In this application test, the iron salt is ferric chloride hexahydrate, which is configured as a 100mM ferric chloride solution for use. EDTA-Pb is mixed with ethylenediaminetetraacetic acid and lead nitrate at a molar ratio of 1:1. Prepare 10 mM EDTA-Pb. In the experiment, 3mM EDTA-Pb was selected as the target pollutant, 15mL of lead stock solution was added to a 100mL Erlenmeyer flask, diluted to 48.5mL, and 1.5mL of ferric chloride solution was added at an iron-lead molar ratio of 1:1, followed by Add 1g / L desulfurization gypsum, seal the Erlenmeyer flask, stay in the reactor for 3h, the temperature is 25±1°C, and the rotation speed is 250r / min. The reaction of the other two groups is similar to this, for the addition of ferric chloride solution and desulfurization gypsum alone, the dosage remains the same as before...

Embodiment 2

[0026] Example 2: The effect of coexisting ions on the removal of EDTA-Pb by the iron salt-desulfurized gypsum system.

[0027] Calcium, magnesium, and sodium ions are common ions in water, and it is necessary to study their influence on the system. In the experiment, 3mM EDTA-Pb was selected as the target pollutant, and 15mL of lead stock solution was added to a 100mL conical flask, and then added Dilute metal ions of different concentrations to 48.5mL, add ferric chloride solution 1.5mL with iron-lead molar ratio 1:1, then add desulfurization gypsum at 1g / L, seal the conical flask, and stay in the reactor The time is 3h, the temperature is 25±1°C, and the rotation speed is 250r / min. A total of 3 groups of experiments, each group of calcium, magnesium, and sodium, each group of experiments with 5 concentration gradients (concentrations were 0, 1, 5, 10, 50mM Ca 2+ / Mg 2+ / Na + ). figure 2 is the removal effect diagram of EDTA-Pb by the iron salt-desulphurization gypsum s...

Embodiment 3

[0028] Example 3: Effect of pH on the removal effect of EDTA-Pb by the iron salt-desulfurized gypsum system.

[0029] pH refers to the ratio of the total number of hydrogen ions to the total amount of substances in a solution, and is an important parameter that reflects the acidity and alkalinity of a solution, and is also an important parameter that affects the removal process. In the experiment, 3mM EDTA-Pb was selected as the target pollutant, 15mL of lead stock solution was added to five 100mL conical flasks, and then diluted to 48.5mL, the pH of the five samples was adjusted to 2-6, and finally the iron-lead molar ratio Add ferric chloride solution 1.5mL at 1:1, then add desulfurization gypsum at 1g / L, seal the Erlenmeyer flask, stay in the reactor for 3h, temperature is 25±1°C, and rotation speed is 250r / min. Figure 5 It is the removal effect diagram of EDTA-Pb by iron salt-desulphurization gypsum system under different pH conditions, which can be obtained from Figure...

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Abstract

The invention discloses a method for removing EDTA-Pb by using an iron salt-desulfurization gypsum system, and belongs to the technical field of solid waste treatment and resource utilization. The iron salt-desulfurization gypsum system is constructed, iron ions act as a displacer for displacement of lead chelated with carboxyl groups to release lead ions, and desulfurization gypsum acts as a trapping agent for the lead ions for precipitation separation of the lead ions. The method has simple operation and low cost, and uses the iron salt-desulfurization gypsum system to quickly remove the EDTA-Pb to achieve the purpose of using waste for treatment of the waste and achieve removal of 98% of the chelated lead in 5 minutes without destroying organic matters. The method has a good applicationprospect.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment and resource utilization, and relates to a method for removing EDTA-Pb by using an iron salt-desulfurized gypsum system. Background technique [0002] Heavy metal pollution has always been the focus of wastewater treatment. However, most methods for removing heavy metals focus on removing free heavy metals, such as adsorption, ion exchange, and membrane separation. Ligands or industrial wastewater from factories are compounded. Due to the strong complexing ability of the ligands, this metal chelate has high stability and is difficult to remove by traditional methods. At present, there are roughly two treatment methods for heavy metal chelates. One is to destroy organic matter to release metal ions. Typical treatment processes include electrochemical oxidation, Fenton oxidation, UV / H 2 o 2 , these processes destroy the ligands and release the metal ions from them, which are then rem...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/62C02F101/34C02F101/38
CPCC02F1/281C02F1/62C02F2101/34C02F2101/38
Inventor 孙秀云李瑞王连军李桥沈锦优韩卫清李健生刘晓东
Owner NANJING UNIV OF SCI & TECH
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