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Method for adsorbing and removing microscale antibiotic in livestock and poultry waste water by modified zeolite

A technology for modifying zeolite and antibiotics, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problem of low adsorption rate, poor adsorption removal efficiency, weak adsorption selectivity, etc. problems, to achieve the effect of improved adsorption rate and efficiency, low treatment cost, and low investment in infrastructure and equipment

Inactive Publication Date: 2012-07-18
ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of cation exchange performance that can strengthen the zeolite, improve its selective adsorption capacity, and improve the performance of livestock and poultry, aiming at the defects of weak adsorption selectivity, low adsorption rate and poor adsorption removal efficiency in natural clay mineral adsorbents. The adsorption and removal efficiency of trace antibiotics in wastewater is a method for effectively controlling the pollution and harm of antibiotics to water bodies. Modified zeolite adsorption and removal of trace antibiotics in livestock and poultry wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: (modified zeolite adsorption removes method 1 of trace antibiotics in livestock and poultry wastewater)

[0025] The method proceeds as follows:

[0026] (1) Biological pretreatment of livestock and poultry wastewater: After the wastewater collected from livestock and poultry farms is pretreated by the UASB (upflow anaerobic sludge bed)-MBR (aerobic membrane bioreactor) secondary combination process, the effluent The COD is 82 mg / L, the concentration of tetracycline antibiotics is 0.18 mg / L, and the pH is 5.0, for standby;

[0027] (2) Zeolite modification treatment: the natural zeolite and the nitric acid solution with a concentration of 25% are mixed according to the ratio of mass volume 1g: 10ml; Vacuum filtration; rinse the treated zeolite with deionized water for 3-5 times, vacuum filter and then dry in an oven at 120°C to constant weight to obtain a nitric acid modified zeolite adsorbent for future use;

[0028] (3) Adsorption treatment of livestoc...

Embodiment 2

[0030] In this example, the biological pretreatment of step (1) livestock and poultry wastewater: the COD of the effluent after biological treatment is 70 mg / liter, the concentration of tetracycline antibiotics is 0.97 mg / liter, and the pH is 6.0, for subsequent use; step (2) zeolite Modification treatment: mix natural zeolite with hydrochloric acid solution with a concentration of 50% according to the ratio of mass volume 1g: 20ml; vacuum filter the mixture and dry it in an oven at 105°C to constant weight to obtain hydrochloric acid modified zeolite adsorption agent; step (3) adsorption treatment of livestock and poultry wastewater: the hydrochloric acid modified zeolite adsorbent and the pretreated livestock and poultry wastewater are put into the closed pool according to the ratio of mass volume 1g: 2000ml, after stirring and adsorbing for 5h under the condition of 30 ℃, tetracycline The detected concentration of antibiotics was reduced to 0.09 mg / L, and the removal rate wa...

Embodiment 3

[0032] In this example, the biological pretreatment of step (1) livestock and poultry wastewater: the COD of the effluent after biological treatment is 99 mg / liter, the concentration of tetracycline antibiotics is 0.80 mg / liter, and the pH is 7.0, and it is standby; step (2) zeolite Modification treatment: mix natural zeolite with sulfuric acid solution with a concentration of 35% according to the mass volume ratio of 1g:16ml; vacuum filter the mixture and dry it in an oven at 110°C to constant weight to obtain sulfuric acid modified zeolite adsorption agent; step (3) adsorption treatment of livestock and poultry wastewater: the sulfuric acid modified zeolite adsorbent and the pretreated livestock and poultry wastewater are put into the closed pool according to the ratio of mass volume 1g: 1300ml, after stirring and adsorbing for 3h under the condition of 25 ℃, tetracycline The detected concentration of antibiotics was reduced to 0.10 mg / L, and the removal rate was 88.8%. Under...

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Abstract

The invention discloses a method for adsorbing and removing microscale antibiotic in livestock and poultry waste water by modified zeolite, which belongs to the waste water treatment technical field. The method comprises the following steps: 1) biological pretreatment of livestock and poultry waste water; 2) zeolite modified treatment; and 3) adsorption and treatment of livestock and poultry waste water and the like. According to the invention, after the adsorption treatment by zeolite modified by nitric acid, hydrochloric acid and sulfuric acid, the removal rate of tetracycline antibiotics in livestock and poultry waste water can respectively reach 61.1%, 90.7% and 88.8%, but the removal rate of the natural zeolite are only 10.3%, 12.9% and 16.0% under the same condition, thereby the method of the invention has the characteristics of simple process flow, convenience, less investment, abundant material source, cheap and easily available material, low treatment cost and the like. The invention can be popularized and applied in large-scale livestock and poultry breeding enterprises.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for removing trace antibiotics in livestock and poultry wastewater by using modified zeolite to adsorb and remove them. Background technique [0002] In recent years, with the rapid development of domestic intensive livestock and poultry breeding industry, the problem of antibiotic pollution in livestock and poultry wastewater has become increasingly serious, and antibiotics in water bodies have become a major obstacle to the reuse of water resources. Because tetracycline antibiotics such as tetracycline, oxytetracycline, chlortetracycline, etc., which are widely used in livestock and poultry breeding industry, have good water solubility, most of them are still excreted in the original form after metabolism in the body, and are not easy to be destroyed in the environment. Because of biodegradation and other reasons, it is easy to be stored and accumulated in...

Claims

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Application Information

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IPC IPC(8): C02F9/14B01J20/30B01J20/18
Inventor 肖华喻曼许育新奚辉景金富陈喜靖安文浩陈晓旸
Owner ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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