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Method for removing oxytetracycline from livestock and poultry breeding wastewater by biomass charcoal of straws

A technology of livestock and poultry breeding wastewater and biochar, applied in the field of biochar removal of oxytetracycline in water, can solve problems such as time-consuming, high cost, and impact of antibiotic migration, and achieve cost-environmental friendliness, reasonable and effective use, and low cost cheap effect

Inactive Publication Date: 2013-04-24
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These high-priced heavy metal ions are easy to complex with antibiotics, which will inevitably affect the mobility of antibiotics.
[0005] At present, it is difficult to remove antibiotic residues in wastewater by ordinary sewage treatment process, while existing biochemical oxidation methods are time-consuming and costly
However, there is no report on the use of biochar to remove oxytetracycline in livestock and poultry wastewater

Method used

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  • Method for removing oxytetracycline from livestock and poultry breeding wastewater by biomass charcoal of straws
  • Method for removing oxytetracycline from livestock and poultry breeding wastewater by biomass charcoal of straws
  • Method for removing oxytetracycline from livestock and poultry breeding wastewater by biomass charcoal of straws

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weighed 0.2 g of biochar prepared at 300 °C and added it to 20 mL of an aqueous solution with a concentration of oxytetracycline of 10 mg / L at a solid-to-liquid ratio of 1:100, and adjusted the pH of the system to 5.5 with 0.1 mol / L HCl. Shake at a speed of 15 rpm in the dark, remove the sample bottle at 0.5, 1, 1.5, 2, 5, 8, 12, 18, 24, 30, 36 and 48 h, filter with a 0.45 μm glass fiber membrane, and efficiently Liquid chromatography (HPLC) was used to determine the residual concentration of oxytetracycline in the filtrate, and each treatment was set up with 3 replicates. The result is as figure 1 It was shown that with the increase of shaking time, the adsorption amount of oxytetracycline on biochar first increased rapidly, then increased slowly, and the adsorption amount no longer increased significantly after 24 h. The removal rate of oxytetracycline was 86% at adsorption equilibrium.

[0029]

Embodiment 2

[0031] Weigh 0.2 g of biochar prepared at 300 °C and add it to 20 mL of oxytetracycline in an aqueous solution with a concentration of 1-92 mg / L at a solid-to-liquid ratio of 1:100, and adjust the pH of the system with 0.1 mol / L HCl or NaOH to 2.0, 3.5, 5.5, 7.5 and 10.0, shake at 15 rpm in the dark for 24 h at room temperature, filter with a 0.45 μm glass fiber membrane, and measure the residual concentration of oxytetracycline in the filtrate by high performance liquid chromatography (HPLC). Three replicates were set for each treatment. The result is as figure 2 It was shown that in the pH range of 3.5-10, biochar had a strong adsorption capacity for oxytetracycline, and the adsorption capacity first increased and then decreased with the increase of pH, and reached the maximum at pH 5.5. Under the optimal pH condition of pH 5.5, the adsorption and removal rate of oxytetracycline with an initial concentration of 1-92 mg / L by 300 °C biochar was 98%-45%.

[0032]

Embodiment 3

[0034] Weigh 0.2 g of 300°C, 400°C, 500°C and 600°C biochar, respectively, and add it to 20 mL of an aqueous solution with a concentration of 92 mg / L of oxytetracycline at a solid-to-liquid ratio of 1:100, and adjust with 0.1 mol / L HCl The pH of the system was 5.5, shaken at room temperature at a speed of 15 rpm in the dark for 24 h, filtered through a 0.45 μm glass fiber membrane, and the residual concentration of oxytetracycline in the filtrate was determined by high performance liquid chromatography (HPLC). repeat. The result is as image 3 As shown, as the carbonization temperature increased from 300°C to 600°C, the removal rate of oxytetracycline in water increased from 44.6% to 97.7%.

[0035]

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Abstract

The invention provides a method for removing oxytetracycline from livestock and poultry breeding wastewater by biomass charcoal of straws. The method comprises the following steps of: adding biomass charcoal into aqueous solution containing the oxytetracycline and Cu<2+> according to the solid-liquid ratio (g / mL) of (1:50)-(1:100), adjusting the pH to 3.5-7.5, and stirring for 24-48 hours. According to the method provided by the invention, the agricultural straws are used as a raw material to prepare the biomass charcoal so as to realize reasonable and effective utilization of the agricultural waste, so the method is not only low in cost, but also is environment-friendly. The rate of adsorbing and removing the oxytetracycline from the aqueous solution by the biomass charcoal at 600 DEG C is highest; when the initial concentration is lower than 92mg / L, both the adsorption rate and the removal rate can be above 92%; while with respect to the biomass charcoal at 300 DEG C, the removal rate of the oxytetracycline is relatively low, but under the synergetic promotion of the Cu<2+>, the adsorption removal rate can be increased above 99%, the Cu<2+> can be adsorbed and the Cu<2+> concentration in the treated wastewater can be controlled to be lower than 0.2mg / L at the same time to meet the surface water II grade and the irrigation water quality standard.

Description

[0001] technical field [0002] The invention belongs to the water pollution treatment technology in the field of environmental protection, and relates to a method for removing oxytetracycline from water by utilizing biomass charcoal prepared by pyrolysis of agricultural waste. [0003] Background technique [0004] With the rise and development of large-scale farming, antibiotics are widely used as feed additives to prevent and treat diseases, promote animal growth and improve feed utilization. However, since the vast majority of antibiotics are water-soluble, 30-90% of the antibiotics ingested by animals are not digested and absorbed by the stomach and enter various environmental media in the form of parent compounds along with their feces and urine, resulting in serious antibiotic pollution[ Sören, T.B. Pharmaceutical antibiotic compounds in soils-a review. J. Plant Nutr. Soil Sci . 2003, 166: 145-167.]. At present, low-concentration antibiotics have been detected in ...

Claims

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Application Information

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IPC IPC(8): C02F1/28B01J20/20
Inventor 王芳贾明云蒋新卞永荣宋洋谢祖彬杨兴伦谷成刚
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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