| 摘要 |
<P>PROBLEM TO BE SOLVED: To more miniaturize a water quality-improving tank when the raised fossil of coral is crushed into gravel or small gravel to use it. <P>SOLUTION: The water quality-improving tank 10 is nearly cylindrical and has a water inlet 14 at its lower part and a water outlet 15 at its upper part. The inside of the tank is provided with circular partition-forming plates 20 and a plurality of small pores 25 through which water passes. The small pores 25 are all formed to be the same pattern in all the partition-forming plates, and the respective partition-forming plates are arranged in a circumferential direction while adjusting their angles so that the small pores 25 in an upper stage may not linearly be lined with the small pores 25 in a lower stage. Since the respective partition-forming plates 20 are arranged so that the small pores 25 may not linearly lined, water taken from the water inlet 14 at the lower part is prevented from linearly flowing and smoothly moving upward. Consequently, much residence time is ensured. <P>COPYRIGHT: (C)2013,JPO&INPIT |
