Many transoceanic vessels enter the Great Lakes carrying residual ballast water and sediment that harbours live animals and diapausing eggs. In this study, we examine the potential for sodium hypochlorite (NaOCl) to reduce the risk of species introductions from diapausing invertebrate eggs in residual ballast sediment. We collected sediment from three transoceanic vessels and from Lake Erie and exposed them to NaOCl concentrations between 0 and 10,000 mg/L for 24 h. Hatching success was reduced by >89% in all four experiments at 1,000 mg/L relative to unexposed controls. Fewer species hatched at high than at low NaOCl concentrations. Based on an average residual ballast of 46.8 tonnes, the volume of NaOCl required to treat inbound vessels is 374 L. Impacts of NaOCl use could be minimized by neutralization of treated residuals with sodium bisulfite. Further research is needed, however, to evaluate the effect of NaOCl on ballast tank corrosion.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.marpolbul.2005.11.001 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Discharge of ballast residual sediments during de-ballasting procedures: A more realistic estimate of propagule pressure.
Mar Pollut Bull
October 2024
Maurice-Lamontagne Institute, Fisheries and Oceans Canada, 850 route de la Mer, Mont-Joli, QC G5H 3Z4, Canada. Electronic address:
Ship ballast residual sediments are an important vector of introduction for non-indigenous species. We evaluated the proportion of residual sediments and associated organisms released during de-ballasting operations of a commercial bulk carrier and estimated a total residual sediment accumulation of ∼13 t, with accumulations of up to 20 cm in some tank areas that had accumulated over 11 years. We observed interior hull-fouling (anemones, hydrozoans, and bryozoans) and high abundances of viable invertebrate resting stages and dinoflagellate cysts in sediments.
View Article and Find Full Text PDFDesign and Verification of Deep Submergence Rescue Vehicle Motion Control System.
Sensors (Basel)
July 2023
Wuhan Second Ship Design and Research Institute, Wuhan 430205, China.
A six degree-of-freedom (DOF) motion control system for docking with a deep submergence rescue vehicle (DSRV) test platform was the focus of this study. The existing control methods can meet the general requirements of underwater operations, but the complex structures or multiple parameters of some methods have prevented them from widespread use. The majority of the existing methods assume the heeling effect to be negligible and ignore it, achieving motion control in only four or five DOFs.
View Article and Find Full Text PDFImprovement in compliance of ships' ballast water discharges during commissioning tests.
Mar Pollut Bull
June 2023
SGS North America, 5500 Business Dr, Wilmington, NC 28405, United States.
The number of ships installing ballast water management systems (BWMS) has risen steeply since the Ballast Water Management Convention entered into force. Since June 2022, biological testing is required during commissioning to verify compliance with the Convention. Data from 676 tests (from 2019 to 2022) show substantial improvement over time: the failure rate decreased from ~20 % to ~6 %.
View Article and Find Full Text PDF[Research Progress and Prospect of Herbicide Residue Characteristics in Black Soil Region of China].
Huan Jing Ke Xue
April 2023
University of Chinese Academy of Sciences, Beijing 100049, China.
Food security is the top priority of a country. As an important granary in China, the northeast black land is a "ballast" to ensure national food security. However, the long-term and high-intensity application of herbicides in black land farmland has led to the accumulation and migration of herbicides in the soil, which affects soil quality, crop yield, and quality and hinders sustainable agricultural development in the black soil.
View Article and Find Full Text PDFToxicity evaluation of chlorinated natural water using Photobacterium phosphoreum: Implications for ballast water management.
J Environ Manage
June 2023
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:
Chlorination of ballast water could produce harmful disinfection by-products (DBPs) and total residual oxidants. The International Maritime Organization calls for toxicity testing of discharged ballast water with fish, crustacea and algae to reduce the risk, but it is difficult to evaluate the toxicity of treated ballast water in a short time. Therefore, the purpose of this study was to analyze the applicability of luminescent bacteria to the assessment of residual toxicity of chlorinated ballast water.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!