Water treatment system and water treatment process

3:

• The water treatment system according to claim 2, wherein
• the flow regulation means includes a plurality of plate-like members spaced apart from each other,
• the horizontal cross sectional area of the space between the plurality of plate-like members is 10 to 50% relative to the horizontal cross sectional area of the water tank, and
• the plurality of plate-like members are each inclined by 0 to 60 degrees with respect to the vertical direction.

4:

• The water treatment system according to claim 2, wherein
• the flow regulation means includes a plurality of cylindrical members,
• the horizontal cross sectional area of the hollowed portions of the plurality of cylindrical members is 10 to 50% relative to the horizontal cross sectional area of the water tank, and
• the plurality of cylindrical members are each inclined by 0 to 60 degrees with respect to the vertical direction.

7:

• A water treatment process which includes a treating step for treating a water with a microorganism, the water treatment process comprising:
• a withdrawing step for withdrawing a partial water from the water treated;
• a storing step for allowing the partial water withdrawn to flow into a water tank having a height in the vertical direction and storing the partial water therein;
• a moving step for moving the partial water flowing downwardly in the vertical direction in the water tank upwardly in the vertical direction;
• a flow regulating step for regulating flow of the partial water moved;
• a circulating step for withdrawing at least a part of the partial water regulated in flow and stored in the water tank from a lower portion of the water tank and circulating the at least a part of the partial water to the ozone reaction unit,
• a generating step for generating ozone;
• a reacting step for allowing the partial water circulated to react in the ozone reaction unit with the ozone generated;
• a re-flow-in step for allowing the partial water reacted to flow again into the water tank, and
• a retreating step for treating again a stored substance moved upwardly, regulated in flow, and stored in the lower portion of the water tank, after the re-flow-in, with the microorganism.