Study on the effectiveness of membrane separation + N2 deoxidation process for the treatment of bacteria in ballast water

Kairui Dong; Yulin Xu; Qiong Wang; Xiuyan Liu; Junzeng Xue; Huixian Wu

doi:10.1016/j.marpolbul.2023.114652

Study on the effectiveness of membrane separation + N₂ deoxidation process for the treatment of bacteria in ballast water

Mar Pollut Bull. 2023 Mar:188:114652. doi: 10.1016/j.marpolbul.2023.114652. Epub 2023 Feb 1.

Authors

Kairui Dong¹, Yulin Xu¹, Qiong Wang¹, Xiuyan Liu², Junzeng Xue¹, Huixian Wu³

Affiliations

¹ College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China; Centre for Research on the Ecological Security of Ports and Shipping, Shanghai Ocean University, Shanghai 201306, China.
² College of Meterial and Environmental engineering, Hangzhou Dianzi University, Hangzhou 310018, China.
³ College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China; Centre for Research on the Ecological Security of Ports and Shipping, Shanghai Ocean University, Shanghai 201306, China. Electronic address: hxwu@shou.edu.cn.

PMID: 36736257
DOI: 10.1016/j.marpolbul.2023.114652

Abstract

Effects of the membrane separation + N₂ deoxidation process on the abundance and activity of bacteria were examined under two salinity conditions at Yangshan Port, Shanghai, China. Sequencing of 16S rRNA gene amplicons demonstrated a decrease in the diversity and activity of bacteria in fresh water and marine water, with a total removal rate of approximately 63 % and 69 %, respectively. Indicator bacteria decreased to 10 CFU·100 mL^-1, which met the IMO D-2 standard. A total of 13 potential pathogens were detected after treatment, indicating that there is still a risk of pathogenic bacteria invasion in the discharge water, particularly marine bacteria, and that the D-2 standard may be insufficient as a preventive measure against pathogenic bacteria transfer. The results will provide reference for government supervision, and will also be important for monitoring foreign bacteria and technology development.

Keywords: Bacterial diversity; Ballast water; Membrane separation + N(2) deoxidation process; Pathogenic.

MeSH terms

Bacteria* / genetics
China
RNA, Ribosomal, 16S / genetics
Sequence Analysis, DNA
Ships
Water*

Substances

Water
RNA, Ribosomal, 16S