the IHS Ballast Water Guide - RWO Marine Water Technology

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IHS Fairplay Solutions Guide to Ballast Water Treatment Systems Sponsored by substances during ballasting and deballasting. The system combines filter and UV units, employs backflushing and is cleaned by automatic wiping. The filter unit maximises the disinfection effect of the UV unit by improving transmittance of UV light. The filter not only eliminates organisms larger than 50µm, but also minimises sediment in the ballast tanks. Water enters through the inlet pipe into the filter area and flows through the cylindrical filter element from inside out. The filtration cake accumulating on the element surface causes a pressure differential to develop across the filter element. When this pressure difference reaches a pre-set value, or after a pre-determined time lapse, the backflushing mechanism kicks in. Backflushing takes 10–30 seconds. During the backflushing cycle the filtered water is not interrupted and continues to flow downstream of the filter. Contaminated water is exposed to UV light. A real-time process control system activates and deactivates lamps to maintain the UV dosage while conserving power. This is controlled and monitored by means of a programmable logic controller (PLC) and touchscreen. Sky-System Peraclean Ocean The Sky-System ballast water management system consists of treatment with the Peraclean Ocean preparation, which contains the active substances peracetic acid and hydrogen peroxide, which are stored in double-walled tanks. The concentrations of the active substances are monitored and, if necessary, neutralised with sodium sulphite (Na 2 SO 3 ) and water before the ballast water is discharged. The 5 neutraliser is contained in epoxy-coated tanks. Temperature and leakage sensors, temperature control unit, ventilators and sprinklers in the chemical storage room are used to prevent the temperature from exceeding 35ºC. During land-based tests using the concentration of active substance that is applied in actual operation, no corrosion was observed. Corrosive influences were reported to be acceptable on the ballast tank coatings ng and uncoated materials. OceanGuard Qingdao Headway 2 9 OceanGuard has been developed by Headway Technology from Qingdao, together with the Engineering department of Harbin University in China. An Advanced Electrocatalysis Oxidation Process (AEOP) is used to manage the treatment, in which short-lived hydroxyl radicals are produced. Because of their highly reactive efficiency in chained mode and effect of the oxidative breakdown, the radicals perform broad spectrum sterilisation, killing off the various forms of bacteria, virus, algae and dormant ovum in the ballast water. The organisms are transformed to simpler organic molecules that are eventually mineralised to CO 2, H 2O and trace inorganic salt. OceanGuard has three main components. The control unit contains the procedures for system operation. It has system diagrams and sensor displays and is used for monitoring and regulating data readings and dealing with any alarm signals. A fully automatic 50µm backflush filter, which can accomplish automatic backflush and filtering at the same time, prevents large organisms from entering the ballast tank to reduce sedimentation. 30 © IHS Global Limited 2012 012_037_CorrectedBW1204.indd 30 01/08/2012 15:36:20
Sponsored by IHS Fairplay Solutions Guide to Ballast Water Treatment Systems An EUT (electro-catalysis enhanced by ultrasonic treatment) unit consists of two parts: an electro-catalysis unit to produce the oxidising substances and an ultrasonic unit that self cleans the EUT unit. Unitor RBT/Wilhelmsen Technical Solutions 5 8 2 Originally developed by South African company Resource Ballast Technologies (RBT), the type-approved Unitor BWTS was marketed by Wilhelmsen of Norway. The inline system uses mechanical cavitation, disinfectants (produced within the system) and physical separation (by means of a 40µm screen) to treat ballast water on intake only. Active substances, in the form of ozone and sodium hypochlorite, are added to facilitate cavitation. The cavitated bubbles implode, which produces a shock wave that kills the targeted organisms. In late February this year the system was withdrawn from sale and the Wilhelmsen Technical Solutions issued a statement saying it has completed a comprehensive performance verification program for the Unitor Ballast Water Treatment System. As a result of the evaluation that followed, the company reached the decision to withdraw the current design of the Unitor BWTS from the market. “We acknowledge the potential impact for our customers and others affected by this decision. However, in keeping with our commitment to compliance, quality and customer satisfaction, we believe this is the only prudent course of action,” said Petter Traaholt, president of Wilhelmsen Technical Solutions. “The verification program showed that the system at this stage of development will not, in our opinion, provide our customers with an effective, fully compliant solution for the varied and dynamic water conditions encountered by a vessel engaged in global trade,” said Traaholt. In addition Traaholt notes that the licensor of the technology placed itself under Business Rescue (the South African equivalent of US Chapter 11 Bankruptcy) in February 2012. . CleanBallast RWO 2 7 The CleanBallast system is designed to be operated in-line using ballast water disk filters for particle removal and the EctoSys electrolysis disinfection process during ballast water uptake. As the first treatment step, Bremen-based RWO has designed a proprietary ballast water disc filter that achieves a high flow rate with a small footprint. The filters are specially designed to deliver excellent performance for heavy-duty operation in harbours with high sediment load, where most ballasting operations take place. The second treatment step is RWO’s proprietary EctoSys electrolysis disinfection system, which disinfects all global water qualities inline, without the need for consumables or additional power generation systems. The final step of the process is an RWOdesigned algae monitor that scans and controls the effluent quality of the discharged ballast water. While the ship is on a voyage, a regrowth of organisms in the ballast water tank is possible. Because the IMO standard has to be met at ship discharge, the ballast water is sent through the EctoSys process a second time, as the algae monitor guarantees compliance with regulations. © IHS Global Limited 2012 31 012_037_CorrectedBW1204.indd 31 02/08/2012 09:25:29
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