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 E

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
Comparison scheme
Effect test

Example Embodiment

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

[0025] In this application experiment, the iron salt is ferric chloride hexahydrate, and it is configured as a 100 mM ferric chloride solution for use. EDTA-Pb is mixed with ethylenediaminetetraacetic acid and lead nitrate at a molar ratio of 1:1, under boiling conditions 10mM EDTA-Pb was prepared. 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 dosed at a molar ratio of iron to lead of 1:1, and then Add 1g / L desulfurization gypsum, seal the conical flask, the residence time in the reactor is 3h, the temperature is 25±1℃, and the rotation speed is 250r / min. The reactions of the other two groups are similar, with the addition of ferric chloride solution alone and the addition of desulfurized gyps...

Example Embodiment

[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. It is necessary to study their influence on the system. In the experiment, 3mM EDTA-Pb was selected as the target pollutant, and 15mL lead stock solution was added to a 100mL conical flask, and then added Different concentrations of metal ions are diluted to 48.5 mL, and 1.5 mL of ferric chloride solution is added at a molar ratio of iron to lead 1:1, and then desulphurized gypsum is added at 1 g / L, the conical flask is sealed, and the reactor stays The time is 3h, the temperature is 25±1℃, and the speed is 250r / min. A total of 3 groups of experiments, one for calcium, magnesium, and sodium, each with 5 concentration gradients (concentrations are 0, 1, 5, 10, 50mM Ca 2+ / Mg 2+ / Na + ). figure 2 Is the removal effect diagram of EDTA-Pb by iron salt-desulfurized gypsum system in the presence of...

Example Embodiment

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

[0029] pH refers to the ratio of the total amount of hydrogen ions in the solution to the amount of total substances, and is an important parameter reflecting the acidity and alkalinity of the solution, and also an important parameter affecting the removal process. In the experiment, 3mM EDTA-Pb was selected as the target contaminant, 15mL lead stock solution was added to 5 100mL Erlenmeyer flasks, and then diluted to 48.5mL, the pH of 5 samples was adjusted to 2-6, and then the iron-lead molar ratio 1:1 dosing 1.5mL of ferric chloride solution, then dosing 1g / L desulfurization gypsum, sealing the conical flask, the residence time in the reactor is 3h, the temperature is 25±1℃, and the rotation speed is 250r / min. Figure 5 It is the removal effect diagram of EDTA-Pb by iron salt-desulfurized gypsum system under different pH conditions. Figure 5 It can be seen that the rem...

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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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