What are the two methods for ballast water exchange at sea?
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What are the two methods for ballast water exchange at sea?
Acceptable methods for ballast water exchange are the sequential method, the flow-through method and the dilution method. Sequential Method: A process by which a ballast tank is first emptied and then refilled with replacement ballast water.
What is the first step in the ballast water treatment process?
Most of the ballast water treatment systems use 2-3 disinfectant methods together, divided into different stages. A general ballast water treatment plant comprises two stages with one stage using physical separation while the second stage employing some disinfectant technology.
Which of the following best describes ballast water exchange by the flow through method?
Flow-through method: The flow-through method is a process by which replacement ballast water is pumped into a ballast tank intended for the carriage of ballast water, allowing water to flow through overflow or other arrangements in order to achieve at least 95 per cent volumetric exchange of ballast water.
What is ballast water management plan?
Ballast Water Management Plan is the plan for the handling or treating of ballast water onboard a vessel to minimize the transfer of harmful organisms or pathogens in the vessel’s ballast water and sediment.
What is VOS system of ballast water treatment?
The VOS (Venturi Oxygen Stripping™) System uses an inert gas generator to strip dissolved oxygen and also the mechanical disruption of aquatic organisms through cavitation using Venturi injectors. This leaves the ballast water effectively sterilised.
What is TRO in ballast water?
In ballast water treatment, a TRO ( Total Residual Oxidants) meter is a measurement device that measures the concentration of various kinds of active substances(*1) used to kill harmful organisms in ballast water. TRO is an indicator of the concentration of chemicals (chlorine compounds, etc.)
What are the safety precautions during ballast water exchange?
Safety considerations
- avoidance of over and under-pressurization of ballast tanks ;
- sloshing loads in tanks that may be slack at any one time ;
- maintain adequate intact stability in accordance with an approved trim and stability booklet taking into account the free surface effects on stability;
What is the purpose of ballast water management convention?
The Convention aims to prevent the spread of harmful aquatic organisms from one region to another and halt damage to the marine environment from ballast water discharge, by minimising the uptake and subsequent discharge of sediments and organisms.
What is the aim of ballast water management convention?
The BWM Convention aims to prevent the spread of invasive aquatic species from one region to another by establishing standards for the management and control of ships’ ballast waters and sediments.
What is Bwms?
Ballast Water Management System (BWMS) means any system which processes ballast water such that it meets or exceeds the ballast water performance standard in regulation D-2. The BWMS includes ballast water treatment equipment, all associated control equipment, monitoring equipment and sampling facilities.
What is TRO value?
TRO (Total Residual Oxidant) is a generic term for these kinds of oxidants. Most of management systems control the treatment and discharge concentrations of them with TRO value, measure TRO value in real time, and based on it, control electric power.
What is TRO unit?
What is the importance of ballast water exchange in ship?
Ballast water is crucial for the safe operation of ships. It is used to adjust the distribution and overall weight of the vessel to keep the ship floating upright and in a safe, stable condition.
What is the ballast water exchange and management plan?
Ballast water exchange is a process which involves the substitution of water in ship’s ballast tanks using either a sequential, flow-through, dilution or other exchange methods which are recommended or made obligatory by the IMO, in order to preserve ecology in biologically rich coastal waters and similar to those in …
