Ultra-stable mineralizer for treating nickel pollution and application of ultra-stable mineralizer in treatment of nickel-containing wastewater and remediation of nickel-polluted soil

A technology of polluted soil and mineralizer, which is applied in the field of soil pollution repair, can solve the problems of high use cost and repair difficulty, poor selectivity of heavy metal ions, and increased dosage of passivating agent, so as to achieve excellent ultra-stable mineralization characteristics and promote Quick contact effect, time-saving effect

Active Publication Date: 2021-02-23
BEIJING UNIV OF CHEM TECH +1
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  • Abstract
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  • Application Information

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Problems solved by technology

However, due to the complexity of soil composition and the diversity of pollution sources, in soil polluted by heavy metals, there are not only a variety of heavy metal ions, but also a large number of other ions that are harmless or even beneficial to the soil. Chemical agents such as organic carbon, hydroxyapatite, attapulgite, etc., have a single active component, and are mainly physically adsorbed

Method used

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  • Ultra-stable mineralizer for treating nickel pollution and application of ultra-stable mineralizer in treatment of nickel-containing wastewater and remediation of nickel-polluted soil
  • Ultra-stable mineralizer for treating nickel pollution and application of ultra-stable mineralizer in treatment of nickel-containing wastewater and remediation of nickel-polluted soil

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Experimental program
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Effect test

Embodiment 1

[0022] Weigh 0.1g calcium aluminum hydrotalcite (Ca 2 Al-SO 4 -LDH, figure 1 ) as an ultra-stable mineralizer in a 1L beaker, add 250ml of Ni 2+ aqueous solution, in which Ni 2+ The concentration is 240mg / L. After magnetic stirring at room temperature for 10 minutes, take the upper layer solution and filter it with a 0.22μm filter membrane, then measure Ni in it by ICP-MS 2+ concentration. The results show that within 10 minutes, the calcium aluminum hydrotalcite ultrastable mineralizer can remove more than 99% of nickel, showing extremely high efficiency. After centrifugation, the resulting product was detected by XRD ( figure 2 ), the results showed that the obtained precipitate was nickel-aluminum hydrotalcite, indicating that nickel ions were anchored in the lattice of the hydrotalcite laminate and transformed into an ultrastable structural state.

Embodiment 2

[0024] The nickel-contaminated soil sample was taken from the polluted plot. According to the national standard GB-15618-2008, the nickel in the soil exceeded the risk screening value by 35 times. Take 1000g soil sample and 20g calcium magnesium iron hydrotalcite (CaMgFe -CO3-LDH) ultra-stable mineralizer is fully mixed in a 1L beaker, add 500ml of deionized water and let it stand naturally, and use CaCl2 method to measure its biologically effective state after sampling at intervals. After 7 days, the effective content of nickel dropped from 0.376mg / kg to 0.043mg / kg, a drop of 88.6%; after 14 days of repair, the effective content of nickel dropped to 0.022mg / kg, a drop of 94.1%; after 28 days, the nickel The effective state content is 0.017mg / kg, which is reduced by 95.5%. The above data show that calcium magnesium iron hydrotalcite ultra-stable mineralizer can greatly reduce the effective content of nickel in soil in a short period of time, showing excellent passivation perfo...

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Abstract

The invention discloses an ultra-stable mineralizer for treating nickel pollution and application of the ultra-stable mineralizer in treatment of nickel-containing wastewater and remediation of nickel-polluted soil. The ultra-stable mineralizer is calcium-based hydrotalcite, wherein calcium atoms in the ultra-stable mineralizer form metal vacancies after the calcium atoms are free, and nickel ionscan be anchored in crystal lattices of a calcium-based hydrotalcite laminate in an isomorphous substitution or dissolution-reconstruction mode, so the nickel ions in the wastewater and the soil can be quickly mineralized to form nickel-containing hydrotalcite with a more stable structure. Under the action of multiple chemical bonds, the stability of a hydrotalcite-like material is far higher thanthe stability of hydroxide and carbonate, so nickel ions are difficult to dissociate, the transmission path of the hydrotalcite-like material from soil to crops by virtue of root systems is cut off,and the hydrotalcite-like material shows excellent ultra-stable mineralization characteristics. Besides, due to the ion radius matching rule, the calcium-based hydrotalcite also shows good selectivity, has a very good effect in in-situ remediation of heavy metal pollution of soil, is economical and environment-friendly, and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of soil pollution remediation, and in particular relates to an ultra-stable mineralizer for treating nickel pollution and its application in the treatment of nickel-containing wastewater and the remediation of nickel-contaminated soil. Background technique [0002] The people are the foundation of the country, and the valley is the life of the people. Food security is an important foundation of national security. However, the pollution of cultivated land by heavy metals is becoming more and more severe. The 2014 National Soil Pollution Survey Bulletin conducted by the State Environmental Protection Agency of China shows that the environmental quality of cultivated land in the country is deteriorating day by day. The proportion of polluted soil in the country is 16.1%, and the rate of contaminated points of cultivated land has reached 19.6%. rate of 4.8%, second only to cadmium pollution. According to stat...

Claims

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Application Information

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IPC IPC(8): C01F7/00B09C1/08C09K17/08
CPCB09C1/08C09K17/08C01P2002/72C01F7/785
Inventor 孔祥贵毛方琪段昊泓段雪
Owner BEIJING UNIV OF CHEM TECH
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