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A kind of feather degradation liquid is used for the method for chromium treatment

A technology for degrading liquids and feathers, applied in chemical instruments and methods, reduced water/sewage treatment, water/sludge/sewage treatment, etc., to achieve the effects of reducing pollution, shortening the preparation cycle, and high content

Active Publication Date: 2020-12-18
HUNAN AGRICULTURAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, to provide a low-cost, high-efficiency, fully-reduced feather degradation solution for chromium treatment, to effectively solve the problem of environmental pollution caused by the accumulation of feather waste, Improve the utilization rate and application market of feather degradation liquid, and efficiently reduce hexavalent chromium in chromium pollutants, and improve the environment of chromium pollutants

Method used

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  • A kind of feather degradation liquid is used for the method for chromium treatment
  • A kind of feather degradation liquid is used for the method for chromium treatment
  • A kind of feather degradation liquid is used for the method for chromium treatment

Examples

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Effect test

Embodiment 1

[0038] Present embodiment provides a kind of method that feather degradation liquid is used for chromium treatment in polluted water, comprises the following steps:

[0039] (1) Preparation of feather degradation solution: prepare medium, medium components include 10 g / L feather, 0.5 g / LK 2 HPO 4 , 0.5 g / L KH 2 PO 4 , 1.0g / LNaCl, adjust the pH of the medium: 8.0. Stenotrophomonas maltophilia ( Stenotrophomnasmaltophilia) CA-001 was inoculated onto the medium with an inoculation loop, and fermented at 35°C for 36 h.

[0040](2) Chromium pollutants Chromium treatment: Mix the feather degradation solution fermented for 36 hours with the polluted water with a hexavalent chromium concentration of 300mg / L according to the weight ratio of 20:1, and let it stand for 1.5 hours to reduce the hexavalent chromium to trivalent chromium.

[0041] Stenotrophomonas maltophilia ( Stenotrophomnasmaltophilia) CA-001 was deposited in the China Center for Type Culture Collection on April 8,...

Embodiment 2

[0043] The difference between this embodiment and Example 1 is that in this embodiment, after the feather degradation liquid is prepared, the prepared feather degradation liquid is centrifuged at 10,000 g for 5 min, and the supernatant of the feather degradation liquid is taken for subsequent use. Then mix the supernatant with the polluted water with a hexavalent chromium concentration of 300 mg / L according to the weight ratio of 20:1, and let it stand for 1.5 hours to reduce the hexavalent chromium to trivalent chromium.

[0044] This embodiment also collects the supernatant of the feather degradation liquid in different fermentation time periods (1, 6, 12, 18, 24, 30, 36, 42 h), and measures the effect of polluted water with a hexavalent chromium concentration of 300 mg / L on the hexavalent chromium concentration. Chromium reduction rate. The supernatants of the feather degradation liquids fermented for 12 h and 24 h were taken, and the content of amino acids in the supernata...

Embodiment 3

[0054] The difference between this embodiment and Example 1 is that in this embodiment, after the feather degradation liquid is prepared, the prepared feather degradation liquid is centrifuged at 10,000g for 5 min, and the supernatant of the feather degradation liquid is taken for subsequent use; the feather degradation liquid is taken The supernatant of the liquid is concentrated with a rotary concentrator to prepare a 5-fold feather degradation concentrate, which is for subsequent use; then the feather degradation concentrate and the polluted water with a hexavalent chromium concentration of 300mg / L are mixed evenly in a weight ratio of 10:1 , standing for 1.5h, the hexavalent chromium will be reduced to trivalent chromium.

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Abstract

The invention discloses a method for chromium treatment by a feather degradation liquid. The method adopts the feather degradation liquid to be directly mixed with chromium pollutants to reduce chromium in the chromium pollutants, and the feather degradation liquid is a fermentation liquid obtained by performing fermentation by adopting feathers as a carbon and nitrogen source. The method specifically comprises the following steps: preparing the feather degradation liquid obtained by performing degradation fermentation on the feathers by stenotrophomnas maltophilia or / and bacillus subtilis for20 h or more; performing solid-liquid separation on the feather degradation liquid to prepare a supernatant; performing concentration on the supernatant to prepare a feather degradation concentrate;and uniformly mixing the feather degradation liquid, the supernatant or the feather degradation concentrate and the chromium pollutants, and allowing the mixed solution to stand for 0.5-1.5 h to reduce hexavalent chromium in the chromium pollutants into trivalent chromium. The method provided by the invention can quickly and effectively reduce the hexavalent chromium, thereby reducing costs in thereduction process of the hexavalent chromium; and the method can improve a utilization ratio of feather waste and reduce pollution to the environment by the hexavalent chromium and the feather waste.

Description

technical field [0001] The invention relates to the field of treatment of heavy metal ions in chromium pollutants, in particular to a method for treating chromium by using feather degradation liquid. Background technique [0002] The main component of feathers is keratin. Keratin is a hard protein with strong resistance and difficult to biodegrade. It is difficult to use directly, resulting in low utilization rate of keratin. The feather waste produced in my country's aquaculture industry reaches more than one million tons every year. When feathers are piled up for a long time, they will easily cause a large amount of accumulation and pollute the environment. [0003] At present, feathers are mainly made into feather meal by physical or chemical methods as raw materials for plant fertilizers or animal feed; but these methods will cause some nutritional components in feathers to be destroyed, and have low efficiency, high energy consumption, and pollution. Large, high cost, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08C02F1/70
CPCB09C1/08C02F1/70C02F2101/22
Inventor 陈金军瞿芳张学文邹鹤飞
Owner HUNAN AGRICULTURAL UNIV