Method for adsorbing and removing microscale antibiotic in livestock and poultry waste water by modified zeolite
A technology for modifying zeolite and antibiotics, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. problems, to achieve the effect of improved adsorption rate and efficiency, low treatment cost, and low investment in infrastructure and equipment
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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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