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A kind of biological heavy metal polluted soil remediation agent and its preparation method and application

A technology for polluted soil and heavy metals, which is applied in the restoration of polluted soil, biochemical equipment and methods, and methods based on microorganisms, etc. effect, effect of good chemical stability

Active Publication Date: 2021-08-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, natural iron oxides provide a limited number of oxygen-containing functional groups and poor adsorption capacity

Method used

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  • A kind of biological heavy metal polluted soil remediation agent and its preparation method and application
  • A kind of biological heavy metal polluted soil remediation agent and its preparation method and application
  • A kind of biological heavy metal polluted soil remediation agent and its preparation method and application

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preparation example Construction

[0031] The invention provides a kind of preparation method of biotype heavy metal polluted soil remediation agent, comprises the following steps:

[0032] 1) adding the template material and iron bacteria into a 9K medium with a pH value of 1.8 to 2.0 for cultivation to obtain a culture solution;

[0033] 2) Add ammonia water dropwise to the culture solution and stir continuously, filter after the reaction is complete, and wash the filtrate;

[0034] 3) Calcining the washed filtrate at 400-600° C. for 60-90 minutes, and cooling naturally to obtain a biological restoration agent.

[0035] In the invention, the template material and the iron bacteria are added to the 9K culture medium with a pH value of 1.8-2.0 for cultivation to obtain a culture solution.

[0036] In the present invention, the characteristics of the template material are as follows: a material with good dispersion, light weight, strong stability, environmental friendliness and large specific surface area. The...

Embodiment 1

[0047] A biological heavy metal contaminated soil remediation agent, the specific preparation method is as follows:

[0048] (1) Preparation of Fe-containing 2+ The 9K medium; the formula of the 9K medium is as follows: (NH 4 ) 2 SO 4 3.0g / L, MgSO 4 ·7H 2 O 0.5g / L, K 2 HPO 4 0.5 g / L, KCl 0.1g / L, Ca(NO 3 ) 2 0.01g / L, Fe(SO 4 )·7H 2 O 44.7g / L;

[0049] (2) prepare ammoniacal liquor, the molar concentration of ammoniacal liquor is 4.5mol / L;

[0050] (3) adding white carbon black and Leptospira ferrous oxide of logarithmic phase growth to the prepared 9K medium, and cultivating them at 38°C; the concentration of the white carbon black in the 9K medium is 1wt%, the initial bacterial concentration is 2×10 7 cells / L;

[0051] (4) After the microorganisms in step (3) have been cultured for 48 hours, slowly add the ammonia water prepared in step (2) dropwise at a flow rate of 0.5mL / min to the above-mentioned bacterial culture solution at room temperature and continuous...

Embodiment 2

[0055] A biological heavy metal contaminated soil remediation agent, the specific preparation method is as follows:

[0056] (1) Preparation of Fe-containing 2+ The 9K culture medium; The formula of 9K culture medium is the same as embodiment 1;

[0057] (2) prepare ammoniacal liquor, the molar concentration of ammoniacal liquor is 1.5mol / L;

[0058] (3) Add white carbon black and Leptospira ferrous oxide grown in logarithmic phase to the 9K medium prepared in step (1), and cultivate them at 38°C; the white carbon black is grown at 9K The concentration in the medium is 2wt%, and the initial bacterial concentration is 2×10 7 cells / L;

[0059] (4) After the microorganisms in step (3) have been cultured for 55 hours, slowly add the ammonia water prepared in step (2) dropwise at a flow rate of 1mL / min to the above-mentioned bacterial culture solution at room temperature and continuously use a stirrer at a speed of 500r / min. Stir for 4 hours, filter after the reaction is comple...

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Abstract

The invention provides a biological remediation agent for heavy metal-contaminated soil, a preparation method and application thereof, and belongs to the technical field of remediation of heavy metal-contaminated soil. In the present invention, the template material with good stability and dispersibility and iron bacteria are inoculated into the 9K culture medium, and iron bacteria are loaded on the surface and pores of the template material, so that various active groups are added to the material, and the adsorption effect of the template material on metal ions is enhanced. At the same time, under the action of iron bacteria, ferrous ions are oxidized to form ferric ions, and after reacting with ammonia water, they are calcined at high temperature to form biological heavy metal contaminated soil remediation agents. The restoration agent has both the adsorption properties of iron bacteria and iron oxides and good dispersion properties. The raw materials adopted in the invention are all environment-friendly, the preparation process of the restoration agent is simple, the adsorption efficiency is high, and the effect of durable restoration of heavy metal arsenic and antimony polluted soil or water can be achieved.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal-contaminated soil, and in particular relates to a biological heavy metal-contaminated soil remediation agent and its preparation method and application. Background technique [0002] With the rapid development of mining, smelting, chemical industry, electroplating, tanning and other industries, heavy metal pollution is becoming more and more serious. Arsenic (As) and antimony (Sb) are two typical heavy metals that usually coexist in soil and water. Excessive As and Sb in agricultural soils can adversely affect soil quality and crop growth, and ultimately pose a serious threat to human health and ecological security due to their toxicity, non-biodegradability, and bioaccumulation. At present, the treatment methods of heavy metal As and Sb polluted soil mainly include: isolation method, that is to use barrier technologies such as cement solidification and isolation walls (quickli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/00B09C1/08B09C1/10C12N11/14C02F3/34C12R1/01C02F101/20
CPCB09C1/00B09C1/08B09C1/10C02F3/34C02F2101/20C09K17/40C12N11/14
Inventor 李骞金胜明尹华群许瑞南小龙
Owner CENT SOUTH UNIV
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