Charcoal-loaded biological iron and manganese oxide material and preparation method and application thereof

A technology of manganese oxide and biochar, applied in the direction of chemical instruments and methods, applications, soil conditioning materials, etc., can solve the problems of high treatment cost and operating cost, damage to soil structure, low repair efficiency, etc., and achieve good oxidation and adsorption Action, huge surface area, effect of reducing scale

Pending Publication Date: 2021-11-05
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heat treatment is also a major arsenic-contaminated soil remediation technology. This technology will also destroy the soil structure when treating arsenic-contaminated soil, and it also faces problems such as high treatment costs and operating costs.
There are many cases of solidification / stabilization applied to arsenic-contaminated soil, such as cement solidification, chelating agent stabilization, iron-manganese oxide and other inorganic materials, etc., but in order to obtain a better restoration effect, the dosage of most restoration agents is generally If it is more than 5%, it also faces problems such as high cost and easy to produce secondary pollution.
Phytoremediation, microbial remediation and other arsenic-contaminated soil remediation technologies have disadvantages such as low remediation efficiency and long remediation time

Method used

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  • Charcoal-loaded biological iron and manganese oxide material and preparation method and application thereof
  • Charcoal-loaded biological iron and manganese oxide material and preparation method and application thereof
  • Charcoal-loaded biological iron and manganese oxide material and preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0044] The preparation process of the production medium is to firstly prepare the precursor of the production medium, then adjust the pH, then add manganese carbonate, and finally sterilize. Specifically, ammonium ferrous sulfate (0.15g / L) in the precursor of production medium; Yeast extract powder (0.075g / L); Sodium citrate (0.15g / L); Sodium pyrophosphate (0.05g / L) and Manganese carbonate (1g / L). Add manganese carbonate 0.2g / L.

[0045] In some examples of this embodiment, after the production and cultivation is completed, the precipitate obtained by centrifugation is the biochar-supported bio-iron-manganese oxide material.

[0046] In some examples of this embodiment, the strain is subjected to production culture after enrichment culture.

[0047] In one or more embodiments, the temperature of the enrichment culture is 15-35° C., and the time is 1-5 days.

[0048] In one or more embodiments, the composition of the enrichment medium for enrichment culture is 0.45-0.55 g / L ...

Embodiment approach

[0049] The third embodiment of the present invention provides an application of the biochar-loaded bio-iron-manganese oxide material in remediating arsenic-contaminated soil.

[0050] The fourth embodiment of the present invention provides a method for arsenic-contaminated soil. The biochar-loaded bio-iron-manganese oxide material is added to the arsenic-contaminated soil, and the moisture content of the arsenic-contaminated soil is adjusted, followed by cultivation and repair.

[0051] In some examples of this embodiment, the moisture content of the arsenic-contaminated soil is adjusted to 20-60%.

[0052] In some examples of this embodiment, the temperature of the culture restoration is 15-35° C., and the time is 2-6 weeks.

[0053] In order to enable those skilled in the art to understand the technical solution of the present invention more clearly, the technical solution of the present invention will be described in detail below in conjunction with specific embodiments.

Embodiment 1

[0055] 1) Enrichment culture of bacterial strains

[0056] Pseudomonas putida strain MnB1 was inoculated in Pseudomonas putida enrichment medium at a volume ratio of 2%, and then aerobic enrichment culture was carried out at 30°C under horizontal shaking at 180rpm for 3 days; The enrichment medium is composed of yeast extract powder 0.5g / L; acid hydrolyzed casein 0.5g / L; glucose 1g / L; calcium chloride dihydrate 0.29g / L; magnesium sulfate 0.82g / L; ferric chloride 1ml / L; trace element 1ml / L; PH=7; 1.8g agar / 100ml;

[0057] The selected bacterial strains were from the American Type Culture Collection (ATCC).

[0058] 2) Preparation of biochar-loaded bio-iron-manganese oxides:

[0059] Preparation medium: ferrous ammonium sulfate (0.15g / L); yeast extract powder (0.075g / L); sodium citrate (0.15g / L); sodium pyrophosphate (0.05g / L) and manganese carbonate (1g / L L), add 300mL medium into a 500mL Erlenmeyer flask, adjust pH=7. Add 0.2g / L manganese carbonate at the same time (add 0...

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Abstract

The invention belongs to a soil remediation treatment technology, and relates to a biochar-loaded biological iron and manganese oxide material and a preparation method and application thereof. According to the biochar-loaded biological iron and manganese oxide material, biochar is used as a carrier, the carrier is loaded with a bacterial strain, and bivalent manganese and bivalent iron form a biological iron and manganese oxide under the action of the bacterial strain and are adsorbed on the carrier. The preparation method comprises the following steps: adding the biochar and the bacterial strain into a production culture medium for production and culture to obtain the biochar-loaded biological iron and manganese oxide material, wherein the culture medium contains divalent manganese salt and ferrous salt. The biochar-loaded biological iron and manganese oxide material can effectively convert arsenic in soil into a residue state so that the remediation effect is remarkably improved.

Description

technical field [0001] The invention belongs to soil remediation treatment technology, and relates to a biochar-loaded bio-iron-manganese oxide material and a preparation method and application thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Arsenic (As) has a strong teratogenic and carcinogenic effect, and its carcinogenicity is listed as a first-class by the International Agency for Research on Cancer. Human beings can be exposed to arsenic through drinking water and the food chain, and arsenic will accumulate in large quantities in the liver and kidney organs of the human body. Relevant pathological studies have found that long-term intake of drinking water o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/10B09C1/08
CPCC09K17/40B09C1/10B09C1/08
Inventor 张艳茹王华伟孙英杰占美丽王亚楠李卫华卞荣星王坤
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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