| 摘要 |
A compact low-cost ballast water purification apparatus that is capable of annihilating microorganisms present in ballast water with minimal ozone consumption, thereby inhibiting useless consumption of ozone. The ballast water purification apparatus is adapted to perform the filtration/ozonization operation (A) of branching part of filtrate water resulting from filtration in a filtration section, injecting ozone into the branched filtrate water in an ozone injection section and causing the ozonized filtrate water to join the unbranched filtrate water; the filtration-trapped matter sterilizing operation (B) of causing the ozonized filtrate water after ozone injection to flow back to the filtration section and annihilate any trapped plankton and the countercurrent washing operation (C) of applying countercurrent washing means for feeding washing water from a downstream side of the filtration section and discharging any trapped matter of the filtration section outside the system, while sequentially switching these filtration/ozonization operation, filtration-trapped matter sterilizing operation and countercurrent washing operation.
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