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Inert Gas System (IGS) which was developed to prevent the explosion of tanker, discharge acid water of large quantity to sea in harbour. MARPOL of 1973 for sea pollution regulated to equip IGS with COW, therefore the number of IGS tanker increases and the pollution by effluent water of IGS is concerned. With regard to the prevention of pollution by IGS previously, the surveys of water discharge from IGS and surveys of surrounding sea water were made in 4 harbours, and the studies of mechanism of the scrubbers were carried out by a pilot test plant of IGS. The results of the surveys and the studies were showing as follows: 1) Pollution caused by the water discharge from IGS was not recognized. Although the value of PH in the effluent water were 2-3 and the value of the total sulphur increased, the water discharge from IGS were completely diluted and varied chemically. 2) By multistep scrubbers used in the tests, a few kinds of discharge water were gained. The effluent from the former step scrubber were acid water and contained many sulphur. The water of the after step scrubber were rather clean. 3) The extraction efficiency of SO2gas varied by the steps of scrubber and by the quantity of water. 4) For the purpose that the extraction efficiency of SO2gas was performed 100 per cent, it was necessary to supply the water which quantity was 0.6% of the volume of the gas for the scrubber at least. But for the high content SO2gas, the studies must be continued still more. 5) The studies are carrying out using sea water for the scrubber.
公益社団法人日本マリンエンジニアリング学会の論文

イナ-トガス装置のスクラバ排水について

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