Abstract: Disclosed are a method and apparatus for reusing wastewater. The method for reusing wastewater disclosed herein includes: generating a mixed wastewater by mixing multiple types of wastewater (S20); performing a first purification by passing the mixed wastewater through a flocculation-sedimentation unit (S40); performing a second purification by passing an effluent of the flocculation-sedimentation unit through a membrane bioreactor (MBR) (S60); performing a third purification by passing an effluent of the MBR through a reverse-osmosis membrane unit (S80); and reusing an effluent of the reverse-osmosis membrane unit as cooling water or industrial water (S100).

Abstract: A fluid-forwarding sludge-discharge device for a settlement basin, the device including: a pressurized water spraying unit of which one end is disposed adjacent to the floor of the settlement basin; a sludge suction cover which is disposed on an upper part of the floor such that the lower part thereof covers the upper part of the sludge-receiving unit in a state having an open box shape and collection guide plates which are provided joined to the floor of the settlement basin and guide the sludge being moved by means of the pressurized water spraying unit such that the sludge flows towards the sludge inflow recess.

Abstract: The present sludge discharging system for a settlement basin may have the partition portion between the sludge conveying region and sludge discharging region on the bottom of the settlement basin. The first pressurized water ejection assembly may move the sludge from the sludge conveying region to the sludge discharging region. The second pressurized water ejection assembly may move the sludge from the sludge discharging region to the discharging port out of the settlement basin. The separation-water ejection assembly may form a separation water wall above the partition portion to suppress the back-flow of the sludge to the sludge conveying region during the second pressurized water ejection assembly moves the sludge to the discharging port. This may achieve a reliable sludge discharging operation.

Abstract: A fluid-forwarding sludge-discharge device for a settlement basin, the device including: a pressurised water spraying unit of which one end is disposed adjacent to the floor of the settlement basin; a sludge suction cover which is disposed on an upper part of the floor such that the lower part thereof covers the upper part of the sludge-receiving unit in a state having an open box shape and collection guide plates which are provided joined to the floor of the settlement basin and guide the sludge being moved by means of the pressurised water spraying unit such that the sludge flows towards the sludge inflow recess.

Abstract: Disclosed is an apparatus for preventing algae proliferation including floats that float on the water; a frame-shaped underwater supporting structure that is provided with connecting wires so as to be disposed in water while being connected to one sides of the floats; an underwater film that is attached to the underwater supporting structure to be spread in a horizontal direction so as to reduce the amount of sunlight introduced in water under the underwater supporting structure, and that is provided with a circulating hole formed in one side to penetrate in a vertical direction to have permeability of water; and a float circulating unit that is provided with an impeller disposed in the circulating hole, and that selectively rotates the impeller in a clockwise direction or counterclockwise direction to allow underwater floats positioned above and under the underwater film to be circulated through the circulating hole.