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Method for enhancing degradation of organic arsenic in waste water of livestock breeding into pentavalent arsenic by utilizing weak potential

A livestock and poultry breeding wastewater, weak potential technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. It can remove problems such as poor effect, and achieve the effect of improving conversion rate, simple structure and easy access.

Active Publication Date: 2014-03-26
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic arsenic in wastewater mainly includes trivalent arsenic and pentavalent arsenic. The toxicity of trivalent arsenic is 60 times higher than that of pentavalent arsenic, which is more harmful.
Moreover, the removal of trivalent arsenic is far more difficult than that of pentavalent arsenic. Many reagents have a good removal effect on pentavalent arsenic, but their removal effect on trivalent arsenic is poor.

Method used

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  • Method for enhancing degradation of organic arsenic in waste water of livestock breeding into pentavalent arsenic by utilizing weak potential
  • Method for enhancing degradation of organic arsenic in waste water of livestock breeding into pentavalent arsenic by utilizing weak potential
  • Method for enhancing degradation of organic arsenic in waste water of livestock breeding into pentavalent arsenic by utilizing weak potential

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Treatment of artificially prepared wastewater containing Roxars arsenic (20mg / L)

[0036] 1. The diameter of the reactor is 7cm, and the volume is 250mL. Open holes on both sides to insert carbon rod electrodes with a diameter of 6 mm, and the distance between the carbon rods is 5 cm. Put the artificially prepared wastewater into the anaerobic reactor, add 10mL of domesticated anaerobic sludge to each reactor, the mass ratio of the domesticated anaerobic sludge to wastewater is 1:20, the temperature of the anaerobic system It is controlled at 35°C and the pH value is controlled at 7.0-8.0. The experiment was divided into four groups to explore the characteristics of anaerobic degradation of Roxars:

[0037] In the first group, take 200mL of waste water containing roxarsarsenic and add it to the reactor. The concentration of roxarsarsenic is 20 mg / L, and sodium acetate is added to increase the COD in the waste water to 3000 mg / L;

[0038] In the second grou...

Embodiment 2

[0042] Example 2: Treatment of waste water (40mg / L) containing Roxars arsenic from a pig farm

[0043] 1. The aquaculture wastewater containing Roxars arsenic discharged from the pig farm (the content of Roxars arsenic is 40mg / L) is passed into the batch reactor equipped with domesticated anaerobic sludge, and the volume of anaerobic sludge accounts for about 10% of the effective volume, the mass ratio of domesticated anaerobic sludge to wastewater is 1:20, adding NaHCO3 to adjust the pH between 7.0-7.5, and controlling the temperature at 35°C. First, perform the first stage of anaerobic treatment to remove It is easy to degrade organic matter. After the end of gas production (COD≤200mg / L), the first stage ends.

[0044] 3. When the COD drops significantly below 200mg / L, add a weak potential to the anaerobic system to enter the second stage. The temperature is controlled at 35°C, the pH is between 7.0-7.5, and the voltage of the weak potential is 0.5V. Sludge In a state of ne...

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Abstract

The invention discloses a method for enhancing degradation of organic arsenic in waste water of livestock breeding into pentavalent arsenic by utilizing weak potential. The method is characterized in that under the condition that a carbon source is exhausted, weak potential is added into an anaerobic treatment system, additional electron acceptors are provided for waste water of the organic arsenic, and the speed for degrading and converting the organic arsenic into the pentavalent arsenic by anaerobic microorganisms is improved. The treatment method has the advantages that the degradation enhancing effect to the organic arsenic is good, fast conversion from the organic arsenic into the pentavalent arsenic is realized, and the difficulties of high solubility, difficult removal and slow degradation of the organic arsenic in the waste water are solved.

Description

1. Technical field [0001] The invention relates to a method for strengthening the degradation of organic arsenic in livestock and poultry breeding wastewater to pentavalent arsenic by utilizing weak potential, and belongs to the technical field of organic arsenic wastewater treatment. The method of the invention has a good removal effect on organic arsenic, realizes the rapid conversion of organic arsenic to inorganic pentavalent arsenic, and solves the problems of high solubility, difficult removal and slow degradation of organic arsenic in wastewater. 2. Background technology [0002] In recent years, organic arsenic preparations have been widely used as feed additives in livestock and poultry breeding industry. At present, the arsenic preparations that have been approved for use mainly include roxarsenic and asfanilic acid, among which roxarsenic is more economical. Roxar arsenic is 3-hydroxy-4-nitrophenylarsenic acid, which is a common organic arsenic feed additive, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 胡真虎石林王海龙袁守军王伟
Owner HEFEI UNIV OF TECH
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