Energy-saving internal reflux system and using method thereof

Abstract

The invention discloses an energy-saving internal reflux system and a using method thereof. The energy-saving internal reflux system comprises a reflux pump, a horizontal through-wall pipe, a square elbow, a vertical pipe and a check lifting valve. The using method comprises the steps that the reflux pump is started, a non-return bowl in the check lifting valve is located on the lower portion, thetop elevation of the non-return bowl is lower than the liquid level of an anoxic pond, water in an aerobic pond is lifted into the anoxic pond through the reflux pump; the reflux pump is closed, water in the anoxic tank flows into the tail end of the aerobic tank through the internal reflux system due to the fact that the liquid level in the anoxic tank is higher than that in the aerobic tank, and the liquid level in the non-return bowl is lower than that in the anoxic tank; and when the reflux pump needs to be started again, water in the aerobic tank overflows from the top of the non-returnbowl through the lifting of the internal reflux pump. By arranging the check lifting valve in the internal reflux system, the energy consumption of the internal reflux system can be effectively reduced, and when the return pump operates normally, the lift of the return pump can be reduced by more than 30% without overcoming the resistance of a traditional non-return device.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an energy-saving internal backflow system and a use method thereof. Background technique [0002] In sewage treatment, anaerobic + anoxic + aerobic treatment process is used to remove pollutants. In order to realize the denitrification function, it is necessary to return the nitrate at the end of the aerobic tank to the anoxic tank for denitrification and denitrification. The return flow is large, generally 300% to 400% of the water intake. Since the liquid level difference between the aerobic pool and the anoxic pool is relatively small, generally less than 0.2m, the lift of the internal reflux pump is small, and a submersible horizontal axial flow pump is generally used. In order to prevent the internal reflux pump from stopping, the anoxic pool passes through The internal backflow system directly enters the end of the aerobic tank, resulting in substandard effluent, ...

AI Technical Summary

Problems solved by technology

[0003] like Figure 1-Figure 2 Shown: The conventional check method of the internal return system adopts the installation of a valve or the installation of a standpipe (the standpipe is higher than the liquid level in the anoxic tank). This check method will increase the lift of the internal return pump by 0.4-0.5m

Due to the large internal return flow and 24-hour operation, the resulting high energy consumption

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