Method for removing antibiotics in swine wastewater by use of metal oxide loaded active carbon

A technology for loading metals and oxides, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage multi-stage treatment, etc. and other problems, to achieve the effect of improving the removal rate, improving the synergistic catalysis, and improving the efficiency.

Inactive Publication Date: 2013-09-18
HUAZHONG UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

However, ozone oxidation is selective, and the utilization rate of ozone is not high, and the reaction rate is low. It is difficult to completely oxidize pollutants in water, and it is easy to produce oxidation by-products. The salinity of pollutants is low, thus limiting the ozone oxidation technology. Application in degrading antibiotics

Method used

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  • Method for removing antibiotics in swine wastewater by use of metal oxide loaded active carbon
  • Method for removing antibiotics in swine wastewater by use of metal oxide loaded active carbon
  • Method for removing antibiotics in swine wastewater by use of metal oxide loaded active carbon

Examples

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Embodiment 1

[0029] Wastewater from a large-scale pig farm was treated by solid-liquid separation and anaerobic digestion [Technology reference: Lin Hailong et al., Research progress in biological treatment of antibiotic wastewater. China Agricultural Science Bulletin, 2012 (11): pp. 258-261], Commonly used veterinary antibiotics (including oxytetracycline and norfloxacin) in the effluent have not been removed [see: Kummerer, K., Antibiotics in the aquatic environment-A review-Part I.CHEMOSPHERE, 2009.75(4): p. 417-434.]. By adopting the method of the invention, the pig raising waste water after the biological treatment is added into the reaction vessel, the water flow velocity is 5m / h, the residence time is 60min, and the water is continuously fed and discharged. The activated carbon of the carrier metal oxide fills the entire reaction vessel, and the total ozone dosage for the reaction is 5 mg / L.

[0030] In the above-mentioned embodiment, the metal oxide loaded is the oxide of cerium, ...

Embodiment 2

[0035] The difference between this embodiment and Example 1 is that the metal oxide loaded on the activated carbon is iron oxide, the impregnation solution is iron nitrate with a molar concentration of 1.2 mol / L, and the others are the same as in Example 1. In this embodiment, the removal rate of oxytetracycline in swine wastewater is 66%, and the removal rate of norfloxacin is 61%.

[0036] Adopt embodiment 2 to the removal of oxytetracycline and norfloxacin in waste water

[0037]

Embodiment 3

[0039] The difference between this embodiment 3 and embodiments 1 and 2 is that the metal oxide loaded on the activated carbon is manganese oxide, the impregnation solution is manganese nitrate with a molar concentration of 1.2 mol / L, and the others are the same as in embodiment 1. In this embodiment, the removal rate of oxytetracycline in wastewater is 70%, and the removal rate of norfloxacin is 64%.

[0040] Adopt embodiment 3 to the removal of oxytetracycline and norfloxacin in waste water

[0041]

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Abstract

The invention provides a method for removing antibiotics in swine wastewater by use of metal oxide loaded active carbon. By combining metal oxide loaded active carbon with an ozone oxidation technology and adopting active carbon as an adsorbent, trace antibiotics in the water body can be adsorbed and are enriched on the surface of the active carbon so that the ozone contacts and reacts with antibiotics more easily; and meanwhile, the active carbon also can be used as a catalyst to catalyze ozonolysis to generate free radicals with strong oxidbillity. The metal oxide loaded on the surface of the active carbon also can catalyze ozonolysis to generate free radicals, and the antibiotic molecules are quickly oxidized and decomposed into smaller molecules and are further mineralized into carbon dioxide, water and inorganic salt so as to achieve the aims of degradation and antibiotic removal. The method provided by the invention realizes an obvious effect on removing antibiotics of the output swine wastewater treated by a biological treatment process, and has the advantages of economy, convenience, strong operability, good comprehensive treatment effect and the like.

Description

technical field [0001] The invention relates to a method for removing antibiotics from swine wastewater by catalyzing ozone oxidation loaded with metal oxide activated carbon. Background technique [0002] Large-scale pig farming wastewater mainly comes from the cleaning of pig houses, pig urine and some pig manure in pig farms. Therefore, the wastewater has the characteristics of high organic matter concentration, high suspended solids content, and high nitrogen and phosphorus concentration; Growth status, large-scale pig farms usually use some feed additives and antibiotics containing heavy metals such as Cu, of which only 10-20% of Cu and antibiotics will be digested in pigs, most of the heavy metals and antibiotics will pass through pigs The digestive system is directly excreted from the body. Studies have shown that in dry pig manure, the average content of antibiotics is as high as 121.78 mg / kg, and the content of Cu is also as high as 135-471 mg / kg. [0003] At pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/78
Inventor 刘正乾吴晓晖章北平崔玉虹钟振兴郑渊贾王桢
Owner HUAZHONG UNIV OF SCI & TECH
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