Simulated Experiment on Minimizing the Presence Chlorella and Bacteria in Ballast Water by Combination of Micro-hole Filtration and UV Radiation

摘要

The work intends to combine micro-hole filtration and UV radiation technologies to eliminate the presence of aquatic organisms and pathogens in ballast water.In a vessel of 1 m~3,natural seawater was added with chlorella solution at different concentration to simulate ballast water,and passed through a micro-hole ceramic filter (1200 mm~2 x 150 mm) and UV light radiation (36 W) successively at 2 m~3/h.The samples were taken before filtration,after filtration/before UV radiation and after UV radiation,and the chlorella removal rate and bacteria inactivation rate were evaluated via absorbency reading,chlorella counting and bacteria counting. The results have shown that the pressure drop of filtration is about 0.02 MPa,the removal rate of chlorella is up to 93%,and the UV inactivation rate of bacteria is greater than 87%.In addition,the estimated costs of initial installment and common operation prove that the processing method is feasible both economically and tech- nologically.