Method for removing hexavalent chromium in water through synergism of nanometer copper oxide and bacteria

A nano-copper oxide and hexavalent chromium technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problem of difficult to meet requirements, unsatisfactory adsorption method and biological method removal rate, and easy effluent chromium concentration. Exceeding the standard and other problems, to achieve the effect of mild experimental operating conditions, short culture period and large application potential

Active Publication Date: 2017-12-19
CENT SOUTH UNIV
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Problems solved by technology

However, the removal rate of adsorption method and biological method is not ideal, and the concentration of chromium in the effluent is still easy to exceed the standard, which is difficult to meet the requirements, and has received many restrictions in practical application.

Method used

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  • Method for removing hexavalent chromium in water through synergism of nanometer copper oxide and bacteria
  • Method for removing hexavalent chromium in water through synergism of nanometer copper oxide and bacteria
  • Method for removing hexavalent chromium in water through synergism of nanometer copper oxide and bacteria

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Embodiment 1

[0029] Nano-copper oxide and bacteria synergistically remove hexavalent chromium in water: add 5 mg nano-copper oxide to 100 mL LB liquid medium, sterilize at 121 °C for 20 minutes, and then add sterile potassium dichromate solution to make the concentration of hexavalent chromium 20 mg / L. Activate and expand Curpriavidussp.B-8 in LB liquid medium until the absorbance at 600nm is 0.8-1.0 to obtain the bacterial liquid, and inoculate 10mL of the bacterial liquid into the above-mentioned solution containing hexavalent chromium and nano-copper oxide. Cultivate for 36 hours at 30°C, natural pH conditions, and shaking at 150 rpm. After the reaction, the solution is centrifuged at 12,000 rpm for 5 minutes to obtain a supernatant that is the treated aqueous solution.

[0030] The growth curve of bacteria and the change of hexavalent chromium removal rate over time in this embodiment are as follows: image 3 shown. Compared with the growth curve obtained in Comparative Example 2, it ...

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Abstract

The invention relates to a method for removing hexavalent chromium in water through synergism of nanometer copper oxide and bacteria. Nanometer adsorption and biological reduction are common methods for chromium-containing waste water, but when the nanometer copper oxide or the bacteria are singly adopted to remove the hexavalent chromium in the water, the removal rate is usually not ideal. The method has the advantages that the functions of the bacteria and the nanometer copper oxide are fully exerted, further the adsorbing-reducing capability of the bacteria for the hexavalent chromium is improved by utilizing the nanometer copper oxide, the hexavalent chromium in the waste water is rapidly removed in a synergistic manner, the removal rate can reach 100% and the effect is obvious. The method also has more advantages of few use amount of chemical substances, mild reaction condition, no secondary pollution and simple operation and the like, and has better application prospect.

Description

technical field [0001] The invention belongs to the technical field of microbial application and wastewater treatment, and relates to a method for synergistically removing hexavalent chromium in water with nanometer copper oxide and bacteria. Background technique [0002] Chromium-containing compounds are widely used in tanning, metallurgy, electroplating, printing and dyeing, photography, textile and chemical industries, and will produce a large amount of wastewater containing hexavalent chromium. Hexavalent chromium mainly exists in the form of chromate ion in water, which has high carcinogenic and mutagenic ability to organisms, so hexavalent chromium in water seriously endangers the environment and human health. my country's "Comprehensive Sewage Discharge Standard" (GB8978-1996) stipulates that the concentration of hexavalent chromium in water discharged from production and living activities shall not exceed 0.5mg / L, while my country's "Drinking Water Sanitation Standar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F101/22
CPCC02F1/281C02F3/34C02F2101/22
Inventor 颜旭周沫石岩宋萌萌柴立元杨志辉彭驰
Owner CENT SOUTH UNIV
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