Method for constructing post-dam water purifying overflow dam

Abstract

The invention discloses a method for constructing a post-dam water purifying overflow dam, which comprises a gate dam. The gate dam divides a river into an impounding section and a purified water section; the water level of the impounding section is at least three meters higher than the water level of the purified water section; the purified water section is provided with a trapezoidal berm; a microbial water purifying layer is laid on the a trapezoidal berm; the trapezoidal berm is provided with an impounding ditch; one end of the impounding ditch is communicated to the impounding section upstream of the gate dam by a diversion canal; the other end of the impounding ditch is provided with a water retaining dam; and the impounding ditches can discharge water upstream of the gate dam to a surface of the berm, so that the water enters the purified water section downstream of the gate dam after being purified by the microbial water purifying layer. The method for constructing post-dam water purifying overflow dam adopts a distribution that microorganisms adhere to matrices in a gradient so as to significantly improve the water purification efficiency, and to save the water purification cost. In a later stage, matrices at the bottom of the berm can be replaced with matrices in an upper part to improve the service life of the water purification system.

Description

technical field [0001] The invention relates to a sewage purification system, in particular to a construction method of a back-dam water purification overflow dam used for overall purification of river sewage. Background technique [0002] As we all know, there is a large water level drop before and after the dams of rivers. The potential energy of these waters will be used in hydropower generation in large-scale rivers, but in small and medium-sized rivers, due to objective reasons such as cost, this potential energy is often used. Wasted due to neglect. At present, there is still no technology in China to use the potential energy of water in the area behind the dam to combine with the overflow to purify the water body. This technology uses natural clean energy, is clean and environmentally friendly, and has no secondary pollution. However, it can only be used when the water level drop in front of the dam and behind the dam is large during the closing period, and cannot pl...

AI Technical Summary

Problems solved by technology

This technology uses natural clean energy, is clean and environmentally friendly, and has no secondary pollution. However, it can only be used when the water level drop in front of the dam and behind the dam is large during the closing period, and cannot play its normal role when the water level drop is small during the opening period.

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