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Remediation method and application of chromium-polluted water body

A remediation method and technology for chromium pollution, applied in the fields of water pollutants, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of easy agglomeration of nZVI, aging of nZVI, decrease in reduction and removal ability, etc., so as to improve the removal efficiency and avoid cost effect

Pending Publication Date: 2020-07-14
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its high reactivity and nanoscale size, it is easily oxidized in air or water, resulting in the accumulation of iron oxide layer on its surface, resulting in the aging of nZVI, even if nZVI is loaded on biochar, similar problems will occur. (Loading on biochar can solve the problem that nZVI is easy to agglomerate), and the reactivity of nZVI after aging decreases, so that the final reduction and removal ability of Cr(VI) decreases; this also puts forward higher requirements for the preparation process and preservation of nZVI Require

Method used

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  • Remediation method and application of chromium-polluted water body
  • Remediation method and application of chromium-polluted water body
  • Remediation method and application of chromium-polluted water body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Preparation of a biochar-loaded aging nanometer zero-valent iron and cultivation of Shewanella MR-1 bacteria

[0020] 1. Preparation of biochar:

[0021] Step 1): Wash the fresh palm biomass with distilled water, dry it at 80°C, and break it into pieces to obtain biomass fragments;

[0022] Step 2): Put the biomass fragments in a vacuum tube furnace, raise the temperature to 500°C under a nitrogen atmosphere, and the heating rate is 10°C / min, stop heating after keeping for 2 hours, and take it out at room temperature to obtain biochar;

[0023] Step 3): Then soak the prepared biochar in 1mol / L HCl solution, shake at 200rpm for 5 hours to remove excess impurities, and finally rinse with deionized water until the pH of the solution remains unchanged, and dry at 80°C to obtain the final product The biochar (referred to as BC, XRD see figure 1 in C).

[0024] 2. Preparation of biochar-loaded aged nano zero-valent iron:

[0025] Step 1): Add the biochar (0.9g)...

Embodiment 2

[0031] Example 2: Anaerobic removal of Cr(VI) from water by biochar-loaded aging nanometer zero-valent coupling Shewanella MR-1 bacteria under different pH conditions

[0032] Step 1): Prepare a Cr(VI) solution with a concentration of 12 mg / L, and the solvent is oxygen-free deionized water;

[0033] Step 2): Take the biochar-loaded aging nano-zero-valent iron prepared in Example 1 and Shewan's MR-1 bacteria for Cr(VI) adsorption kinetics experiment, the dosage of nZVI / 500B is 1g / L, and Shewan's The OD600 of MR-1 bacteria was set to 0.2 and no addition, and the concentration of sodium lactate was 20mmol / L. The initial pH value of the chromium solution was adjusted to 5, 7 and 9 with 0.1M HCI solution and 0.1M NaOH solution for the experiment, and the reaction system 40mL, react in a 100mL vial, and the entire reaction process is carried out in an anaerobic box;

[0034] Step 3): start timing after feeding, and take samples at specified time points, and the sampling times are 0...

Embodiment 3

[0037] Example 3: Anaerobic removal of Cr(VI) in water by biochar loaded with aged nanometer zero-valent coupling Shewanella MR-1 bacteria with different dosages of bacteria

[0038] Step 1): Prepare a Cr(VI) solution with a concentration of 12 mg / L, and the solvent is oxygen-free deionized water;

[0039]Step 2): Take the biochar-loaded aging nano-zero-valent iron prepared in Example 1 and Shewan's MR-1 bacteria for Cr(VI) adsorption kinetics experiment, the dosage of nZVI / 500B is 1g / L, and Shewan's MR-1 bacterium OD600 is set to 0.2, 0.4 and 0.6 respectively, referred to as MR-11.25%, MR-12.5%, MR-13.75%, wherein sodium lactate concentration is 20mmol / L, with 0.1M HCI solution and 0.1M NaOH solution The initial pH value of the chromium solution was adjusted to 7 for the experiment, the reaction system was 40mL, and the reaction was carried out in a 100mL vial, and the entire reaction process was carried out in an anaerobic box;

[0040] Step 3): start timing after feeding, ...

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Abstract

The invention discloses a remediation method and application of a chromium-polluted water body, and the method comprises the following steps: adding biochar-loaded aged nano zero-valent iron and Shewanella MR-1 bacteria into the chromium-polluted water body at the same time, and performing reacting for 120-360 minutes under an anaerobic condition. The preparation method of the biochar-loaded agednano zero-valent iron comprises the following steps: adding biochar into a ferrous sulfate solution, performing uniform mixing, adding a NaBH4 solution, performing continuous stirring, collecting precipitates, performing washing and drying, thereby obtaining the biochar-loaded aged nano zero-valent iron. The nano zero-valent iron is extremely easy to oxidize into aged nano zero-valent iron in theair; after oxidation, the reactive activity is reduced, and the charcoal-loaded aged nano zero-valent iron is coupled with the Shewanella MR-1 bacteria, so that the removal efficiency of hexavalent chromium can be obviously improved, the additional cost required by the nano zero-valent iron in the preparation process and the storage process is avoided, and the method can also be applied to the field of removal of chromium-arsenic composite pollutants in water.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a repair method and application of chromium-polluted water. Background technique [0002] In recent decades, with the rapid development of urbanization and industry in our country, especially the discharge of heavy metals in industrial production has caused great damage to groundwater. Chromium (Cr) is an important chemical raw material, and Cr and its compounds have been widely used in various industrial productions (electroplating, alloy materials, printing and dyeing, etc.), thus causing a large amount of chromium slag and chromium-containing wastewater to be discharged, resulting in Groundwater is seriously polluted by chromium, which eventually enters the food chain and endangers plant growth and human health and safety. Cr in water mainly exists as trivalent chromium [Cr(III)] and hexavalent chromium [Cr(VI)]. However, Cr(III) has low toxicity and is easy to form in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F1/70C02F101/22
CPCC02F3/28C02F1/705C02F2101/22
Inventor 田庆文
Owner FOSHAN UNIVERSITY
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