Experimental Study On Degradation Of Ciprofloxacin By Centrifugal Pump Cavitation

Ciprofloxacin(CIP)as a representative QNS,in was even abused in human clinical areas,prevention and treatment of animal diseases in aquaculture,the existing wastewater treatment plants traditionally was difficult to degrade them,there is a potential risk to human health and ecological environment.However,hydrodynamic cavitation as a new advanced oxidation technology,combined with H2O2 can effectively degrade ciprofloxacin.The formation of hydraulic cavitation is mainly divided into two kinds of jet and vortex.There are many studies on the degradation of organic pollutants by jet cavitation effect of porous plates and venturi tubes,there are some problems of high pressure,high energy consumption.At present,the study on the pollutants degradation by vortex cavitation is mainly based on vortex cavitation chamber with special structure.This paper compared the effect of single hydraulic cavitation,single H2O2 and hydrodynamic cavitation combined with H2O2 on the degradation of ciprofloxacin;under the hydrodynamic cavitation/H2O2 system.By adding and removing porous plates,studied on factors influencing the degradation of ciprofloxacin by porous plate hydrodynamic cavitation(jet cavitation),centrifugal pump cavitation(vortex cavitation)and centrifugal + porous plate hydraulic cavitation,compared the 3 kinds of cavitation effect,optimum pH range and energy utilization rate,discussed the effect of centrifugal pump cavitation on the degradation of ciprofloxacin,studied the reaction kinetic equation,the main results are as follows:(1)hydraulic cavitation combined with H2O2 can effectively degrade CIP,and the degradation rate is about 18 times of that of single hydraulic cavitation degradation(4.3%),which is about 5 times of the degradation of H2O2(14.95%);(2)when the initial concentration was 5mg/L,added 0.2L30%H2O2,initial pH value was3.0,cavitation generator is a porous plate(plate 1 β0=0.054,d=1mm),the degradation rate of CIP was 77.49% by hydrodynamic cavitation combined with H2O2.For the same plate,the smaller the cavitation number,the better the degradation effect of CIP;the variation of the cavitation number of nozzle orifice plate is larger than that of orifice orifice plate,and the degradation rate reaches the maximum when the downstream pressure is 0.18 MPa,which is about 44.84%;(3)when the initial concentration was 5mg/L,added 0.2L30%H2O2,initial pH value was3.0,adjusted the valve opening before the pump is 40%,the degradation rate of centrifugal pump cavitation reached the maximum,being 72.64%;(4)when the valve opening before the pump is 100%,the degradation effect of centrifugal pump cavitation was better than that of pump + porous hydraulic cavitation;The degradation rate of CIP by centrifugal pump cavitation increased firstly and then decreased,and ehe degradation rate was higher than that of the pump + porous plate;initial pH value was3.0,added 0.2L30%H2O2,adjusted the valve opening before the pump is 100%,the contribution rate of centrifugal pump was the highest,which was 50.9%.Adjusted the valve opening before the pump is 40%,the degradation effect of centrifugal pump on CIP is 1.2times that of centrifugal pump + porous plate.