the IHS Ballast Water Guide - RWO Marine Water Technology

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IHS Fairplay Solutions Guide to Ballast Water Treatment Systems Sponsored by RWO recently acquired a means of cutting out the time-consuming work and expense of surveying, and acquiring an exact digital reproduction of the space conditions on board ship, accurate to the millimetre. When surveying the location in which the CleanBallast system is to be installed, a highspeed 360° scanner is used to create a threedimensional image of the ship’s engine room, which allows the most advantageous options for the installation to be ascertained. Neo-Purimar Samsung HI 2 7 The Neo-Purimar system from Samsung Heavy Industries treats ballast on the uptake and discharge in a two-stage system. A 50µm self-cleaning filter removes particles, sediments and organisms during ballast uptake before being disinfected by electrolysis-based chlorination. To minimise the use of the chlorine compound NaOCl, sodium hypochlorite solution generated from the electrolysis unit is injected to maintain a maximum chlorine concentration of 10mg per litre total residual oxidants. Water being deballasted is treated by additional disinfection – the sodium hypochlorite solution generated from the electrolysis unit is re-injected – and by neutralisation, by means of a sodium thiosulfate solution. Hydrogen gas, a by-product of the electrochemical process, is separated immediately upon exiting from the electrolytic cell by cyclone separation and is not allowed to enter into the ballast water piping. The gas is then transmitted to a degassing tank, which dilutes the gas to 1% (well below the 4% lower explosive limit) before exhausting to atmosphere. BalPure Severn Trent de Nora 2 7 BalPure, from the US joint venture of Severn Trent Services and Gruppo DeNora, only treats ballast during the uptake on the ballasting operation although a second operation during de-ballasting is done to neutralise and residual oxidants remaining from the treatment stage. Ballast water is first cleared of larger organisms and sediments by a 40µm filter. Once filtered, a slip stream of 1% of the total water ballast uptake flow rate is fed to the BalPure system where a hypochlorite disinfection solution is generated. The mixture of seawater, disinfection solution and hydrogen gas (a by-product of the electrolytic process) then passes through a cyclone-type degas separator to remove the hydrogen gas. The 1% slip stream, now free of hydrogen, is mixed with the remaining 99% of the main uptake flow and used to disinfect the entire volume of ballast water. The total ballast water flow is then transferred to the ballast tanks. A residual disinfectant continues to treat the ballast water during the voyage. The BalPure system is used only in deballasting operations to neutralise the residual oxidant in the ballast water before discharging it from the ship. On deballasting, the filter is bypassed and all treated ballast water is discharged. Before overboard discharge takes place, an automatic neutralisation process occurs. A separate, small stream of a neutralisation agent, sodium bisulphite (7.5 litres per 1,000m 3 ), is automatically added at the inlet of the ballast pump and any other discharge systems such as aft peak tank systems. Seawater is then discharged back to the marine environment. 32 © IHS Global Limited 2012 012_037_CorrectedBW1204.indd 32 01/08/2012 15:36:55
www.mstcglobal.com USED TO PERFORMING UNDER HIGH PRESSURE www.vanzonderen.com MSTC Global and van Zonderen are specialized in offering tailor made services in the fi eld of Hydro-blasting and coating in dry-dock, at sea or quayside. All work programs are carried out by our own staff using our own equipment. MSTC and van Zonderen offer a wide range of products in the fi eld of corrosion protection and prevention. We can also supply all specialist technical items and equipment required in the marine industry. MSTC.indd 1 20/03/2012 15:20
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