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A kind of mixture of calcium ion and pyrosulfite ion and application thereof

A technology of pyrosulfite and calcium ions, applied in the field of pollution control, can solve the problems of iron filings not working, hexavalent chromium contacting and reacting, etc.

Active Publication Date: 2020-05-26
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (3) The reducing agent is covered by sediment and cannot react with the leached hexavalent chromium. For example, zero-valent iron filings are easy to react with dissolved oxygen in water to form iron oxide precipitation, which covers the iron filings and makes most of them The remaining iron filings cannot play a role

Method used

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  • A kind of mixture of calcium ion and pyrosulfite ion and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this example, the groundwater of a certain chromium-contaminated site is treated according to the attached figure 1 in situ restoration.

[0042] The concentration of hexavalent chromium in the soil 1 of this site is 685 mg / kg. First, the ferrous sulfate solution is injected into the contaminated soil 1 through the injection well 2 using a syringe pump to reduce the hexavalent chromium in the soil until the hexavalent chromium in the downstream collection well 3 The concentration of chromium was below the detection limit. Then, using Ca(OH) 2 / CaCl 2 and Na 2 S 2 o 5 Formulated with Ca 2+ and S 2 o 5 2- The aqueous solution is injected into the soil 1 through the injection well 2. Then, an electrode 4 is inserted every 1.5 meters in the soil to form an electrode matrix, and the soil is heated in blocks and kept warm for 1 hour. At this time, it can be found that the injection resistance of the solution increases significantly, and the water seepage in the c...

Embodiment 2

[0044] In this example, the groundwater of a certain chromium-contaminated site is treated according to the attached figure 1 in situ restoration.

[0045] The concentration of hexavalent chromium in the soil 1 of this site is 216mg / kg, first sodium metabisulfite (Na 2 S 2 o 5 ) solution is injected into the contaminated soil 1 through the injection well 2 using a syringe pump to reduce hexavalent chromium in the soil until the concentration of hexavalent chromium in the downstream collection well 3 is lower than the detection limit. Then, use CaO to react with HCl to prepare Ca-containing 2+ An aqueous solution is injected into the soil 1 through the injection well 2. Then, an electrode 4 is inserted every 1.2 meters in the soil to form an electrode matrix, and the soil is heated in blocks and kept warm for 1 hour. At this time, it can be found that the injection resistance of the solution increases significantly, and the water seepage in the collection well 3 also decrea...

Embodiment 3

[0047] In this example, the groundwater of a certain chromium-contaminated site is treated according to the attached figure 1 in situ restoration.

[0048] The concentration of hexavalent chromium in soil 1 of this site is 61 mg / kg, and the concentration of hexavalent chromium in soil 1 exceeds the standard according to the environmental risk assessment of the site. Groundwater testing found hexavalent chromium, but it did not exceed the standard. In order to reduce future environmental risks, preventive restoration of the site was carried out. Use CaCO first 3 with HNO 3 Reaction to produce Ca-containing 2+ An aqueous solution is injected into the soil 1 through the injection well 2. Then, sodium metabisulfite (Na 2 S 2 o 5 ) solution is injected into the contaminated soil 1 through the injection well 2 using a syringe pump until the concentration of hexavalent chromium in the downstream collection well 3 is lower than the detection limit. Then, an electrode 4 is inse...

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Abstract

The invention provides a calcium ion and pyrosulfite ion mixture and application thereof. Ca 2+ and pyrosulfite ion S 2 o 5 2‑ The solution is mixed with heavy metal polluted soil or solid waste at room temperature or low temperature, and then heated to make S 2 o 5 2‑ Thermally decomposed to produce sulfite SO 3 2‑ , SO 3 2‑ with Ca 2+ Calcium sulfite CaSO 3 ·xH 2 O precipitation encloses heavy metal-contaminated soil or solid waste particles.

Description

technical field [0001] The invention relates to the field of pollution control. Background technique [0002] Stabilization / solidification technology is one of the most commonly used technologies in solid waste treatment and disposal, contaminated soil and groundwater remediation. Stabilization refers to the transformation of pollutants into states and forms that are not easily soluble, mobile or toxic, so as to reduce their harm to the ecosystem. Solidification refers to encapsulating pollutants and blocking their migration pathways. In restoration technology, the two effects often occur simultaneously, so the two are usually collectively referred to as stabilization / curing technology. [0003] In the remediation of contaminated soil and groundwater, the most common application of stabilization / solidification is the remediation of heavy metal-contaminated soil, especially the remediation of chromium-contaminated soil and groundwater. 6+ ) reduced to trivalent chromium (C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/08B09B3/00C09K17/06
CPCC09K17/06B09C1/002B09C1/08B09C2101/00B09B3/20
Inventor 李东樊军秦仕强胡思扬桂宸鑫纪国柱
Owner CHONGQING UNIV