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A kind of selenium-enriched residual sludge remediation solution and method thereof for remediation of soil mercury pollution

A technology for excess sludge and soil repair, applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of excess sludge treatment and disposal hindering the promotion of treatment technology, and achieve no risk of secondary release , The effect of repairing is stable and the operation is convenient

Active Publication Date: 2022-04-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, microbial methods will produce a large amount of excess sludge, and the treatment and disposal of excess sludge has always been a difficult problem hindering the promotion of this treatment process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this example, a pea pot test is used to verify the remediation effect of the selenium-enriched residual sludge remediation solution on mercury-contaminated soil, as follows:

[0035] 1) The preparation of selenium-enriched residual sludge remediation solution is as follows:

[0036] Anaerobic granular sludge is used as an inoculum, and an upflow anaerobic sludge bed reactor is used to treat selenium-containing wastewater, and the selenium concentration in the wastewater is 0.5-2.0mol / L. After 45 days of treatment, red selenium-enriched excess sludge was obtained in the reactor, and the selenium content in the selenium-enriched excess sludge was 5.7 mg / g. The above selenium-enriched excess sludge was collected as a remediation agent for subsequent soil mercury remediation experiments. Then the obtained selenium-enriched excess sludge is fully mixed with sodium acetate aqueous solution and glutathione, the concentration of sodium acetate aqueous solution is 10g / L, and...

Embodiment 2

[0046] In this embodiment, the alfalfa pot test is used to further verify the remediation effect of the selenium-enriched residual sludge remediation solution on mercury-contaminated soil, as follows:

[0047] 1) The preparation of the selenium-enriched residual sludge restoration solution is the same as step 1) in Example 1.

[0048] 2) Acquisition of mercury-contaminated soil, as follows:

[0049] The surface soil of a vegetable field in Xinjiang was collected and passed through a 40-mesh sieve to remove impurities such as plastics, gravel, and plant roots. Weigh 500g of sieved soil, add 100mL mercury nitrate solution, and stir evenly. The total Hg content in the mercury-contaminated soil obtained above is 1.95 mg / kg, and the proportion of exchangeable Hg is 85.4%.

[0050] 3) Soil restoration, as follows:

[0051] The mercury-contaminated soil obtained by step 2) is divided into two parts with the same volume, and the selenium-enriched excess sludge remediation solution ...

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Abstract

The invention discloses a selenium-enriched residual sludge remediation liquid for repairing soil mercury pollution and a method thereof. The remediation liquid is obtained by fully mixing selenium-enriched excess sludge, an organic nutrient solution and glutathione; The selenium-enriched excess sludge is sludge with saturated selenium content and selenium-reducing bacteria. Under anaerobic conditions, selenium-reducing bacteria in the sludge can reduce zero-valent selenium to negative divalent selenium, and zero-valent selenium can react with zero-valent mercury in the soil to form stable mercury selenide, which can be combined with negative divalent selenium Divalent mercury in the soil generates mercury selenide, so as to achieve the purpose of soil mercury pollution remediation. Selenium-enriched excess sludge is rich in selenium and selenium-reducing bacteria, and does not require additional addition of bacterial agents and repair agents. The method has the advantages of simple process, convenient operation, low treatment cost, quick effect, no secondary release risk and the like.

Description

technical field [0001] The invention relates to a selenium-enriched excess sludge remediation solution for remediating soil mercury pollution and a method thereof, belonging to the field of soil heavy metal remediation. Background technique [0002] Soil is one of the most basic substances needed for human survival, but with the rapid economic development and intensified human activities, more and more soil has been polluted by heavy metals, among which heavy metal mercury is a very common kind of pollution. Soil mercury pollution has attracted the attention of many governments and international organizations such as the United Nations Environment Programme. Notably, mercury is more persistent in soil than in lakes, oceans and other biomes. There are two forms of heavy metal mercury, zero-valent mercury and divalent mercury, and the organic mercury transformed by it is more toxic. According to some surveys, mercury-contaminated soil poses a serious threat to water supply, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/08B09C1/10
CPCC09K17/40B09C1/08B09C1/10
Inventor 何崭飞陈鑫姬晴晴潘响亮
Owner ZHEJIANG UNIV OF TECH
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