Annular multistage sedimentation tank for sewage treatment

Abstract

The invention discloses an annular multi-stage sedimentation tank for sewage treatment. The annular multi-stage sedimentation tank comprises an annular outer wall, a center column, five settling tanks, a sewage discharge channel gathering device and a sludge guide pipe; the center column is located in the center of the annular outer wall; the five settling ponds are formed in the annular outer wall, distributed around the central column and separated by five partition plates; the sewage discharge channel gathering device is of a spherical structure and is embedded in the bottom of the centralcolumn and the partition plates; the upper half part of the sewage discharge channel collection device is separated by the partition plates and is respectively exposed in the sedimentation tanks, a collection channel and five branch channels are arranged in the sewage discharge channel collection device, one end of each branch channel is provided with a sewage inlet, and the sewage inlets of the branch channels respectively correspond to the sedimentation tanks, so that sludge at the bottom of the tank can be guided into the collection channel; the sludge guide pipe is provided with a sewage pump, and one end of the sludge guide pipe is connected with the collecting channel. According to the invention, sludge at the bottoms of the five settling tanks can be cleaned at the same time as longas the sewage pump on the sludge guide pipe is started, so that the operation is quite convenient.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a settling tank for sewage treatment. Background technique [0002] The drainage system in the foundation pit project often uses multi-stage settling tanks to settle the accumulated water on the site. Its function is to settle the soil and sand in the water, so that the water can be purified to a certain extent, and then discharged into the municipal drainage system. [0003] At present, three-stage settling tanks are usually used. The settlement process is: after the rainwater or groundwater in the drainage ditch flows into the settling tank, it will pass through the three settling tanks of the first, second, and third sets of sedimentation tanks, and then the clean water will be collected by the third settling tank. The sedimentation tank is discharged, and the sludge is deposited on the bottom of each sedimentation tank. After the water is drained, the sludge at the bottom of t...

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Problems solved by technology

[0004] But the above-mentioned three-stage settling tank has the following disadvantages: the settled sludge is not discharged in time, but is first piled up at the bottom of the tank, and after the water is drained, the workers enter the tank to clean up. Clean up in time. When the sludge accumulation is thick, the settlement effect will be affected. At this time, the pond must be stopped and drained to remove the sludge at the bottom of the pond. In this way, the settlement pond will be forced to suspend use, which will affect the entire drainage process. On the one hand, manual cleaning still has the disadvantage of high labor intensity

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