the IHS Ballast Water Guide - RWO Marine Water Technology

More documents

Recommendations

Info

IHS Fairplay Solutions Guide to Ballast Water Treatment Systems Sponsored by Magneto Special Anodes for the development of advanced electrolysis technology. Upon de-ballasting, the system neutralises any remaining active substance using sodium bisulphite, ensuring that the ballast water can be safely discharged back to the sea. The Aquarius systems achieve filtration using automatic backwashing screen filter technology. The filter is designed specifically for ballast water applications and filters particulates down to 40µm. Operation of the filter includes automatic backwashing to ensure efficient removal of particles that are discharged back to the environment of origin; the systems are PLC-controlled with userfriendly touchscreen operation. All relevant data is stored by the programmable logic controller in line with IMO requirements and the system can be fully integrated into the main control system to achieve complete ballast water management on board ship sh ship. ip. ip ClearBallast Hitachi 1 2 The ClearBallast ballast water purification system was developed jointly by Japanese industrial giants Hitachi Plant Technologies and Mitsubishi Heavy Industries. It uses coagulation technology to remove plankton and organisms, and magnetic separation equipment to remove algae. The coagulation method differs from sterilisation techniques, in that it does not use chlorine, UV rays or disinfectants, thus removing the possibility of secondary contamination by residual chlorine. Seawater taken in is treated by adding a coagulant and magnetic powder in coagulation and flocculation tanks. Agitation of the water causes plankton, viruses and mud to coagulate into 1mm-wide magnetic flocs. These can then be collected with magnetic discs in a magnetic separator. Treated water is filtered through a filter separator and injected into the ballast tanks. The coagulation of micro-organisms into small flocs enables the use of coarse filters, which is claimed to result in high-speed treatment. The flexible design is suitable for a wide range of capacities and can be modelled to fit the space available. Mud accumulation is said to be greatly reduced, thereby prolonging the life of the coating of the ballast tank. k. Guardian Hyde Marine 2 3 Destruction of micro-organisms by US-based Hyde Marine’s Guardian is achieved using medium-pressure UV, with a separation unit consisting of a stacked disc filter with automatic backflushing. This can be complemented by a Hyde Mud Remover dosing unit, which contains a liquid cationic polymer that is considered to be nonhazardous and non-toxic. The system works on the principle of flocculation, attracting mud particles into flocs, which do not pack down in the ballast tanks as natural sediment does and which are easily flushed away during deballasting. The polymer is injected into the ballast piping during ballasting from a tank of between 250 and 500 litres capacity depending on the size of the ship. The injection systems can be supplied in automatic or semi-automatic versions. The Hyde Guardian system is of modular design and the two main units – the filter and the UV treatment chamber – can be installed separately or as a skid-mounted system. A control panel controls the system’s two main components and the booster pumps and valves. During ballasting, the ballast water passes through the filter and UV 20 © IHS Global Limited 2012 012_037_CorrectedBW1204.indd 20 01/08/2012 15:32:50
Sponsored by IHS Fairplay Solutions Guide to Ballast Water Treatment Systems system and then back to the main ballast pipeline. During deballasting, the filter is bypassed and only the UV treatment is used to kill any remaining organisms. The stacked disc filter unit can store large amounts of solids. These are removed by means of automatic backflushing, which keeps the filters clean while still allowing a continuous flow. Type Approved models are available for ballast flow rates from 60m3 /h to 6,000m3 /h for vessels of various types and sizes sizes. es es. EcoBallast Hyundai HI 2 3 By not using or producing any kind of chemicals, the EcoBallast system developed by Hyundai HI causes no secondary environmental contamination. This system treats ballast water at uptake, which is advantageous because it reduces sediment built-up and the potential for survival and growth of organisms, and again at discharge. The modular BWTS, which has undergone full-scale testing at 200m 3 /h, comprises a 50µm filter with automatic backflushing; one or more helix UV reactors that can accommodate higher flow rates more efficiently, a high-intensity, medium-pressure ultraviolet lamp and a control and cleaning unit (flow meter and alarms). Although no chemical compounds are used or added to disinfect the ballast water, the effects of UV irradiation are categorised as the active substance. The system is operated by means of a programmable logic controller installed in a control panel. The filter substantially reduces the sediment load in the ballast water. The ultraviolet reactor was specially designed for the ballast water treatment application to maximise the efficiency of the system. HiBallast Hyundai HI 2 7 The HiBallast system from Hyundai HI is described as producing a high concentration of the disinfectant, sodium hypochlorite (NaOCl), by feeding a portion of the ballast water to an electrolyser module. The disinfectant is directly injected into the ballast pipe during ballasting. A reducing agent is injected into the deballasting pipe to remove any remaining oxidant from the hypochlorite concentration which could possibly have an unwanted effect on the marine environment when discharged without neutralisation. Filtration is optional and installation of a 50µm filter improves the efficiency of the electrolysis unit. A side-effect of the electro-chemical production of chlorine is the generation of hydrogen. Because the gas is highly explosive, it needs to be properly vented. Accordingly, a specially devised vent system is employed which uses a water eductor that discharges the generated gas overboard with discharged ballast water. Because the electrolyser and piping are exposed to the generated high concentrations of oxidative disinfectant, comprehensive long-term, land-based corrosion tests are required. The possible leakages of high concentration of disinfectant require adherence to an emergency y pr procedures to prevent human exposure. re. . BallastAce JFE Engineering 2 5 1 BallastAce from JFE Engineering of Japan is a ballast water treatment system that uses filtration, chlorination and cavitation. During ballast water uptake, water is pumped into a filter where large plankton are © IHS Global Limited 2012 21 012_037_CorrectedBW1204.indd 21 01/08/2012 15:33:09
Page 1 and 2: IHS Fairplay Solutions Guide to Bal
Page 3 and 4: Sponsored by IHS Fairplay Solutions
Page 5 and 6: Untitled-4 1 16/03/2012 12:45:14
Page 7 and 8: k Sponsored by IHS Fairplay Solutio
Page 19: Sponsored by IHS Fairplay Solutions
Page 29 and 30: BALLAST WATER TREATMENT CLEAN IS SA
Page 33 and 34: www.mstcglobal.com USED TO PERFORMI
Page 47 and 48: Untitled-4 1 20/03/2012 10:41

the IHS Ballast Water Guide - RWO Marine Water Technology

Create successful ePaper yourself

Delete template?

Save as template?