Closed cycle treatment method of soil leaching waste liquid

A closed-circuit circulation and treatment method technology, applied in the field of water pollution treatment, can solve the problems of no removal effect, etc., and achieve the effect of low treatment cost, efficient removal, and clear and reasonable process principle

Active Publication Date: 2021-06-22
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heavy metal scavenger has basically no effect on the removal of metalloid As and Sb in the soil washing wastewater (Deng T, et al. Sedimentwashing by EDTA and its reclamation by sodium polyamidoamine-multithiocarbamate. Chemosphere, 2017, 168: 450-456 .)

Method used

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  • Closed cycle treatment method of soil leaching waste liquid
  • Closed cycle treatment method of soil leaching waste liquid
  • Closed cycle treatment method of soil leaching waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] figure 1 It is the flow chart of the closed loop treatment method for soil washing waste liquid in Example 1.

[0056] Use ultrapure water, arsenic acid (chemically pure), cadmium chloride pentahydrate (analytical pure), chromium nitrate nonahydrate (analytical pure) and lead nitrate (analytical pure) to prepare simulated soil leaching waste liquid, in which As, Cd , Cr, and Pb concentrations were 99.01mg / L, 9.93mg / L, 19.36mg / L, and 59.24mg / L, respectively, and the EDTA concentration was 0.01mol / L.

[0057] Take 400mL of simulated waste liquid and place it in a 500mL beaker, and adjust the pH of the solution to 5.0 with hydrochloric acid or sodium hydroxide. Then add 900 mg / L (calculated as Al) polyaluminum ferric silicate (the mass content of Al in the polyaluminum ferric silicate is 18.9%), and use hydrochloric acid or sodium hydroxide to adjust the pH value of the solution to 5.0. Under normal temperature conditions, mechanically stir rapidly (360r / min) for 5min, t...

Embodiment 2

[0063] Using ultrapure water, arsenic acid (chemically pure), potassium hexahydroxyantimonate (analytical pure), cadmium chloride pentahydrate (analytical pure), chromium nitrate nonahydrate (analytical pure), lead nitrate (analytical pure), heptahydrate Copper sulfate (chemically pure), zinc chloride (analytical pure), and simulated soil leaching waste liquid were prepared, in which the concentrations of As, Sb, Cd, Cr, Pb, Cu, and Zn were 1261.32mg / L, 745.42mg / L, 13.04mg / L, 27.37mg / L, 193.56mg / L, 183.37mg / L, 64.71mg / L, EDTA concentration is 0.1mol / L.

[0064] Take 400mL of simulated waste liquid and place it in a 500mL beaker, and adjust the pH of the solution to 5.0 with hydrochloric acid or sodium hydroxide. Then add 3600 mg / L (calculated as Al) polyaluminum ferric silicate (the mass content of Al in the polyaluminum ferric silicate is 18.9%), and use hydrochloric acid to adjust the pH value of the solution to 5.0. Under normal temperature conditions, mechanically stir ra...

Embodiment 3

[0069] In this embodiment, the actual soil leaching waste liquid is used as the processing object. The concentrations of As, Sb, Cd, Cr, Pb, Cu, and Zn in the soil washing waste liquid are 1264.36mg / L, 120.78mg / L, 8.94mg / L, 1.21mg / L, 64.21mg / L, 8.31mg / L, 98.14mg / L, EDTA concentration is 0.05mol / L, sodium citrate concentration is 0.01mol / L.

[0070] Take 400mL of simulated waste liquid and place it in a 500mL beaker, and adjust the pH of the solution to 5.0 with hydrochloric acid or sodium hydroxide. Then add 3600 mg / L (calculated as Al) polyaluminum ferric silicate (the mass content of Al in the polyaluminum ferric silicate is 18.9%), and use hydrochloric acid or sodium hydroxide to adjust the pH value of the solution to 5.0. Under normal temperature conditions, mechanically stir rapidly (360r / min) for 5min, then mechanically stir slowly (160r / min) for 30min. Then, add 2mg / L PAM, and stir mechanically at a slow speed (160r / min) for 30min at room temperature. Finally, after...

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Abstract

The invention provides a closed cycle treatment method for soil leaching waste liquid, and belongs to the technical field of water pollution treatment. According to the method, a soluble aluminum salt reacts with As and Sb metals to generate precipitates of aluminum arsenate and aluminum antimonate, and the soluble aluminum salt is hydrolyzed to generate Al(OH)3 with the flocculation adsorption effect, so that the metals As and Sb in the soil leaching waste liquid are effectively removed. Then a heavy metal capturing agent reacts with heavy metals in EDTA-Me to generate heavy metal chelating precipitates, removal of multiple composite heavy metals in the soil leaching waste liquid is achieved, EDTA is recycled, no wastewater is discharged, and closed-loop circulation treatment of the soil leaching waste liquid is achieved.

Description

technical field [0001] The invention relates to the technical field of water pollution treatment, in particular to a closed-loop treatment method for soil washing waste liquid. Background technique [0002] At present, soil pollution remediation has become the third largest pollution control and environmental protection industry after water pollution control and air pollution control. The soil leaching and remediation technology with ethylenediaminetetraacetic acid (EDTA) as the main active ingredient has achieved the efficient removal of various complex heavy metals in the polluted soil, and at the same time brought about a variety of complex heavy metals in the soil after leaching. Disposal of large amounts of EDTA chelates in soil leaching waste. At present, there is still a lack of effective disposal methods for soil leaching wastewater containing high concentrations of EDTA, which will inevitably limit the wider application of EDTA-based soil leaching remediation techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04B09C1/02B09C1/08C07C227/40C07C229/16A62D3/33C02F1/56C02F1/66A62D101/43C02F101/20C02F101/22
CPCC02F9/00B09C1/02B09C1/08C07C227/40A62D3/33B09C2101/00C02F1/56C02F1/001C02F1/66A62D2101/43C02F2101/20C02F2101/22C07C229/16
Inventor 丁雷袁明珠李爽周建民任颖赵建锋崔长征
Owner EAST CHINA UNIV OF SCI & TECH
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