イナートガスシステムの排水による海水の汚染防止対策について

概要

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Inert Gas System (IGS) which was developed to prevent the explosion of tankers, discharges acid water of large quantity to sea in harbour. MARPOL of 1973 rerulated to equip IGS with COW, therefore the number of IGS tanker increases and the pollution by effluent of IGS is concerned. With regard to the prevention of pollution by IGS, the surveys of water discharge of IGS were made in some harbours and the studies of mechanism of scrubbers were carried out by using a pilot plant of IGS. The results of the surveys and studies were showing as follows: 1) Pollution caused by the water discharge of IGS was not recognized. Although the value of PH in the effluent was between 2 and 3 and many quantity of total sulfur was contained, the effluent was completely diluted and varied chemically in sea water. 2) Multistep scrubbers were used in the pilot plant, it was recognized that the effluent of former step scrubbers were acid water and contained many sulfur, and that of after step scrubbers rather clean. 3) For performing to 100 % of extraction efficiency in SO_2 gas, it is necessary that quantity of the scrubber water was 0.5 % of volume of gas at least. 4) Purpose of the studies which make to decrease the quantity of the acid effluent was performed.
独立行政法人海上技術安全研究所の論文
1985-03-30