Ocean sludge exerts a very big environmental load to local sea area. Here, attention was paid to micro-bubble technology for application to the purification of the sludge. The important point in this technique is to activate the bacteria existing in the area by micro-bubbles. In this study, our objects are to develop a new powerful purification system for sedimentary sludge using a micro-bubble device and by activating microorganism. In this study, we used the detergents including enzyme as the microorganism activator. From the results of our experiments, we succeeded in reducing the time needed to purify the sludge, and we obtained very good performance.


It is very important to reduce sedimentary sludge in the ocean. Plans to reduce the sludge are usually dreading or sand covering. Dredging is a simple way and aims to cut off the sludge. But after cutting off, treating the dredged sludge takes much more time and, of course, cost. Sand covering, in general, gives a big load to living organisms and the ecological system. Here, a more efficient way is needed to reduce the sludge while not imparting environmental load in the local sea area. Now, we have micro-bubble technology. Micro-bubbles (that is MB) can change conditions into an aerobic state. If the bubbling stops, the situation changes into anaerobic state, according to recent research. So, we selected a method for decomposing the sludge by microorganisms. Therefore, our research targets purification experiments on oceanic sedimentary sludge by micro-bubbles and microorganism activator. Here, we used the detergents including some kind of enzyme as the microorganism activator, since we can obtain it easily and also is on the market. In this paper, we check the performance by our purification system.

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