Treatment of Microalgae in Ballast Water Using Hydroxyl Radical in Accordance with the D-2 Ballast Water Discharge Standard  

作　　者：MENG Xiangying CHEN Cao BAI Mindong SUN Jian MENG Fanpeng 

机构地区：[1]Institute of Marine Engineering,Department of Physics,Dalian Maritime University [2]College of Environment and Ecology, Xiamen University

出　　处：《高电压技术》2014年第1期232-236,共5页High Voltage Engineering

基　　金：Project supported by National Natural Science Foundation of China(NSFC)for Distinguished Young Scholar(61025001);National Technology Support Project of China(2013BAC06B00);Special Fund for Marine Scientific Research in the Public Interest(201305027-5);Fundamental Research Fund for the Central Universities(3132013316)

摘　　要：The effect of hydroxyl radical(·OH) on microalgae in ballast water is experimentally investigated. An ?OH plasma generator, which has a thin plate discharge Ag electrode covered by two α-Al2 O3 dielectric layers, is built. The plasma generator is filled with O2 and gaseous H2 O and is powered by a homemade power supply. ?OH radicals are generated by a series of plasma reactions and then dissolved into ballast water to kill microalgae. The maximum density of the killed microalgae is about 11 000 cells per milliliter. At this density, the microalgae are not reactivated at the 48th hour and the 120th hour in the treated ballast waters, and the content of chlorophyll in these microalgae decreases by 100%. The water quality returns to a normal level after 120 hours without secondary pollution of aquatic organisms and environment. These results show that the requirements of the D-2 ballast water discharge standard defined by the International Maritime Organization(IMO) are satisfied with the proposed treatment, and that ·OH is an ideal substance for killing microalgae during ballast water replacement of ships.The effect of hydroxyl radical （＇OH） on microalgae in ballast water is experimentally investigated. An ＇OH plasma generator, which has a thin plate discharge Ag electrode covered by two a-A1203 dielectric layers, is built. The plasma generator is filled with O2 and gaseous H20 and is powered by a homemade power supply. ＂OH radicals are gen- erated by a series of plasma reactions and then dissolved into ballast water to kill microalgae. The maximum density of the killed microalgae is about 11 000 cells per milliliter. At this density, the microalgae are not reactivated at the 48th hour and the 120th hour in the treated ballast waters, and the content of chlorophyll in these microalgae decreases by 100%. The water quality returns to a normal level after 120 hours without secondary pollution of aquatic organisms and envi- ronment. These results show that the requirements of the D-2 ballast water discharge standard defined by the International Maritime Organization （IMO） are satisfied with the proposed treatment, and that ＂OH is an ideal substance for killing mi- croalgae during ballast water replacement of ships.

关 键 词：压载水处理 排放标准 微藻 羟自由基 等离子体发生器 国际海事组织 俄亥俄州 最大密度 

分 类 号：U664.92[交通运输工程—船舶及航道工程] U698.7[交通运输工程—船舶与海洋工程]