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Method for removing heavy metal ions in household garbage incineration fly ash eluent

A technology of domestic waste incineration and heavy metal ions, which is applied in chemical instruments and methods, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc. High reactivity and remarkable effect of treatment efficiency

Active Publication Date: 2021-12-17
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current process, the heavy metal content in the final elution water is still high, and in most cases the discharge standard cannot be met
[0003] Although the Chinese patent CN110655172A provides a method for simply activating zero-valent iron to quickly remove pollutants in water, it can achieve heavy metal content when dealing with heavy metal ions in natural water bodies. However, it can’t do anything about the incineration eluate of domestic waste that contains a variety of organic substances and heavy metals at the same time

Method used

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  • Method for removing heavy metal ions in household garbage incineration fly ash eluent
  • Method for removing heavy metal ions in household garbage incineration fly ash eluent
  • Method for removing heavy metal ions in household garbage incineration fly ash eluent

Examples

Experimental program
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Effect test

Embodiment 1

[0053] In this embodiment, separate Fenton process, single activated zero-valent iron process, activated zero-valent iron+Fenton simultaneous treatment process, Fenton process after activated zero-valent iron treatment, and the method in this application respectively carry out metal ion removal. The results are shown in Table 1 below.

[0054] Separate Fenton process: Add 2ppm of Mn, Pb, Cu, As, Se, Hg ions to the eluent respectively, and use actual wastewater to simulate the eluent with high heavy metal concentration. Use 5M dilute hydrochloric acid solution to adjust pH=4, add 4500ppm FeSO 4 After mixing well, add 3300ppm H 2 o 2 , reacted at 25°C, 300rpm shaker for 1h, and measured the ion concentration and COD after filtration.

[0055] Activation of the zero-valent iron process alone: ​​experiment with the eluent. Add 2ppm of Mn, Pb, Cu, As, Se, Hg ions to the eluent respectively, and use actual wastewater to simulate the eluent with high heavy metal concentration. U...

Embodiment 2

[0065] Using the method in this application, the influence of different reaction times on the removal effect of heavy metals was investigated, and the results are shown in Table 2 below.

[0066] Step S2 Reaction 2h: Add 2ppm of Mn, Pb, Cu, As, Se, Hg ions to the eluent respectively, and use actual wastewater to simulate the eluent with high heavy metal concentration. Use NaOH to adjust pH=7, add 30-60g / L excess activated zero-valent iron, 20ppm FeSO 4 and 10ppm FeCl 3 , the reaction took place in a constant temperature water bath at 25°C and a stirring speed of 300rpm, and the reaction time was 120 minutes. The concentration of each ion was measured after interval sampling and filtration.

[0067] Step S2 Reaction 6h: Add 2 ppm of Mn, Pb, Cu, As, Se, Hg ions to the eluent respectively, and use actual wastewater to simulate the eluent with high heavy metal concentration. Use NaOH to adjust pH=7, add 30-60g / L excess activated zero-valent iron, react in a constant temperature...

Embodiment 3

[0073] This example is used to verify that the method also has a good treatment effect when dealing with eluents with high heavy metal concentrations.

[0074] Add 2ppm of Mn, Pb, Cu, As, Se, Hg ions to the eluent respectively, and use actual wastewater to simulate the eluent with high heavy metal concentration. Use 5M dilute hydrochloric acid solution to adjust pH=4, add 4500ppm FeSO 4 After mixing well, add 3300ppm H 2 o 2 , reacted at 25°C, 250rpm shaker. Use NaOH to adjust pH=7, add 30-60g / L excess activated zero-valent iron, react in a constant temperature water bath at 25°C, and stir at a speed of 300rpm, add 20ppm FeSO every 2h during the reaction process 4 and 10ppm FeCl 3 , Reaction time 6h. Adjust pH=9 and let stand for 30 minutes before sampling. The concentration of each ion was measured after interval sampling and filtration. The results are shown in Table 3.

[0075]

[0076] table 3

[0077] It can be seen from Table 3 that the Fenton plus activated ...

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Abstract

The invention belongs to the related technical field of household garbage treatment, and discloses a method for removing heavy metal ions in household garbage incineration fly ash eluent, and the method comprises the following steps: S1, adjusting the household garbage incineration fly ash eluent to be acidic, and then adding Fe <2+> and H2O2 for Fenton reaction; S2, adjusting the pH value of the supernatant after the reaction to 5-7.5, then adding activated zero-valent iron, continuously adding Fe<2+>, Fe<3+> and an oxidizing agent and continuously stirring in the reaction process, or continuously adding Fe<2+> and Fe<3+> and continuously aerating in the reaction process, and reacting for a preset time; and S3, adjusting the solution after the reaction in the step S2 to be alkaline, and performing standing to obtain supernate, namely removing the heavy metal ions. According to the method, deep removal of the heavy metal ions in the household garbage incineration fly ash eluent can be achieved, the removal efficiency of the heavy metal ions is remarkably improved, and remarkable economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field related to domestic waste treatment, and more specifically relates to a method for removing heavy metal ions in an eluate of domestic waste incineration fly ash. Background technique [0002] With social progress and economic growth, people's living standards are improving day by day, human beings' daily production and life are becoming more and more active, and the output of domestic waste is also increasing and the composition of waste is more complex. At present, there are three main ways to deal with domestic waste: (1) waste incineration, which is used for power generation or heat supply, but the process will produce fly ash with high salt content, and the content of heavy metals in waste incineration fly ash is high; (2) composting, Microbes are used to biodegrade garbage and produce fertilizers for soil improvement, but kitchen waste can be composted into garbage, and landfill leachate is unavoidable d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/18C02F101/20C02F101/30
CPCC02F9/00C02F1/66C02F1/722C02F1/705C02F1/72C02F1/62C02F2001/007C02F2305/026C02F2103/18C02F2101/20C02F2101/30C02F2209/06C02F2209/08
Inventor 徐乐瑾吴洁胡红云
Owner HUAZHONG UNIV OF SCI & TECH
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