Scum removal system in sewage treatment plant
AssigneeUtsunomiya Kogyo Co., Ltd.
InventorHideo UTSUNOMIYA
Life of this patent
Estimating the term…
Abstract
To improve treated water quality, reduce environmental impact, and save energy, a system is provided with multiple scum removal devices. In a conduit, a first device uses paired pipes with openings below the scum and a pressure fluid supply to peel scum, along with a water ejection nozzle that directs scum to a scum pit. In a primary sedimentation basin, a second device includes a pipe skimmer, a scum guide, and a water ejection nozzle to move scum toward the skimmer. In a final sedimentation basin, a third device uses a pipe skimmer and a water ejection nozzle that accelerates surface water flow to move scum without breaking it up or muddying the water, as the nozzle ejects less water than in the conduit. This arrangement enhances scum removal efficiency while maintaining water clarity.
Claims5
A scum removal system in a sewage treatment plant in which scum is removed from raw water that is treated via a primary sedimentation basin conduit, a primary sedimentation basin group, a reaction tank, a final sedimentation basin conduit, and a final sedimentation basin group, the system comprising:
- first scum removal devices that are provided in the primary sedimentation basin conduit and the final sedimentation basin conduit;
- second scum removal devices that are respectively provided in primary sedimentation basins of the primary sedimentation basin group;
- and
- third scum removal devices that are respectively provided in final sedimentation basins of the final sedimentation basin group,
- wherein each of the first scum removal devices includes
- a scum peeling device including a pair of pipes that extends along a direction in which the raw water flows inside both side walls of a conduit body in which the raw water flows, that includes a plurality of opening portions provided at intervals in a length direction, and that is provided to be positioned below the scum and a pressure fluid supply portion through which a pressure fluid from a pressure fluid supply source is supplied to the pipes, and
- a water ejection nozzle for a conduit that moves the scum toward a scum pit provided at a terminal end of the conduit body,
- each of the second scum removal devices includes
- a pipe skimmer for a primary sedimentation basin that collects the scum,
- a scum guide mechanism that concentrates the scum in a direction toward a center in a width direction of the primary sedimentation basin, and
- a water ejection nozzle for the primary sedimentation basin that moves the scum toward the pipe skimmer for the primary sedimentation basin,
- each of the third scum removal devices includes
- a pipe skimmer for a final sedimentation basin that collects the scum, and
- a water ejection nozzle for the final sedimentation basin that moves the scum toward the pipe skimmer for the final sedimentation basin, and
- an amount of water ejection of the water ejection nozzle for the final sedimentation basin is set to be smaller than an amount of water ejection of the water ejection nozzle for the conduit.
Dependencies are inferred from the claim text.