| As an emerging pollutant,antibiotics have a widespread and long-lasting presence in water,which has caused widespread concern in recent years.At present,the commonly used water treatment technology is not designed to remove antibiotics,and the quality of the treated water is difficult to guarantee.At the same time,antibiotic removal techniques used in laboratories are costly and difficult to industrialize.In this thesis,ciprofloxacin(CIP)and sulfanilide(SAM),which are used in large quantities and widely used in antibiotics,are selected as representative substances,and they are removed using the technology of dielectrophoresis.The two antibiotics were removed by adsorption-dielectrophoresis(Ads-DEP)and dielectrophoresis(DEP),and a new method for removing antibiotics from water was established.In addition,the electrodes used in the experiment were improved to further improve the removal effect of antibiotics.The specific research analysis is mainly as follows:1.The factors affecting the removal of ciprofloxacin by dielectrophoresis were discussed.The main conclusions are as follows:Compare the effect of Ads-DEP and DEP on the removal of ciprofloxacin.The effect of Ads-DEP on the removal of ciprofloxacin is better than DEP.In Ads-DEP,the result of asorbent screening results shows that activated carbon has the best adsorption performance for CIP.And DEP can improve the adsorption performance of the adsorbent by changing the shape of the adsorbent,thereby improving the removal effect.Under optimal conditions for removal of ciprofloxacin by Ads-DEP(the dosage of activated carbon is 25 mg/L,the flow rate is 0.10 L/h,the applied voltage is 10 V,and the processing time of DEP is 90 min),The removal rate of CIP was 43.3%,and the removal rate was increased by 29.7%compared with simple adsorption.Multi-stage DEP device can further remove CIP in water.Under the optimal conditions(25 mg/L activated carbon,0.10 L/h flow rate,and 10 V applied voltage),The total removal rate of the three-stage DEP device was 94.9%,and the total activated carbon consumption was 75 mg/L.The effluent is relatively clear,and the activated carbon is basically captured by the electrode.2.The factors affecting the removal of SAM by DEP were discussed.The main conclusions are as follows:Ads-DEP can also improve the effect of activated carbon on the adsorption of SAM.When the dosage of the adsorbent was 25 mg/L,it just increased from 10.5%to 13.9%The use of Ads-DEP to directly remove ciprofloxacin has also been explored.The removal effect of DC power is much better than AC power.Under the optimal conditions(flow rate of 0.10 L/h,applied Direct current voltage of 16 V,and processing time of 180 min),the removal rate of SAM reached 49.4%.Compared with the Ads-DEP,it has improved the removal rate of 35.5%.and DEP does not require the addition of an adsorbent.which can further reduce costs Therefore,DEP was selected as the craft for the sulfacetamide removal.3.The improvement of the electrodes used in the dielectrophoresis method was discussed.The main conclusions are as follows:The graphite conductive adhesive and the silver conductive adhesive were used to improve the electrodes(graphite-coated electrode and silver-coated electrode for short,the same applies hereinafter).The graphite conductive paste and the silver conductive paste are coated on the stainless steel wire mesh electrode,and then calcined at 400?.The particles formed on the surface of the wire mesh electrode can form a smaller electric field after being electrified at the same voltage,which can capture more pollutant particles.The improved electrode treatment effect is better than the original wire mesh electrode,and the silver-coated electrode has better antibiotic removal effect than the graphite-coated electrode.Under the optimal conditions(applied voltage of 8 V),the silver-coated electrode can remove 77.1%of SAM.Compared with the original electrode,The applied voltage was reduced by 8 V,and the removal rate was increased by 27.7%. |
PDF Full Text Request