Equipment and method for removing nitrogen out of domestic wastewater

Abstract

The invention provides equipment and method for removing nitrogen out of domestic wastewater. An outer tank body is arranged on the equipment, wherein a first anaerobic tank, a second anaerobic tank, an aeration tank, a precipitation tank and a sterilization tank are sequentially arranged inside the outer tank body; an inflow pipe extending into the first anaerobic tank is arranged on a lateral wall surface of the outer tank body; contact filter materials are arranged inside the first anaerobic tank and the second anaerobic tank; a first duct extending into the second anaerobic tank is arranged inside the first anaerobic tank; a second duct extending into the aeration tank is arranged inside the second anaerobic tank; an aeration system and a reflux pump are arranged at the bottom of the aeration tank; a reflux pipe extending into the first anaerobic tank is arranged on the reflux pump; a biomass carrier is placed into the aeration tank; a communicated channel is arranged at the bottom of the wall surface between the aeration tank and the precipitation tank; a third duct extending to the sterilization tank is arranged inside the precipitation tank; a disinfectant is injected into the sterilization tank; and a release pipe is arranged on the wall surface of sterilization tank on the outer tank body.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a denitrification treatment equipment and method for domestic sewage. Background technique [0002] Domestic sewage discharged in general life contains a large amount of organic pollutants, which can easily lead to pollution of rivers, lakes and other waters, making the discharged water contain high levels of organic nutrients such as carbon, nitrogen, phosphorus, etc., which can easily reduce the dissolved oxygen in the water , affect the safety and sanitation of water sources, and will also destroy the original ecological environment in the water; and the current domestic sewage discharge standards do not regulate the discharge of nitrogen and phosphorus except for water source water quality protection areas. However, the Executive Yuan On November 7, 1992, the Agricultural Committee regulated the upper limit of the concentration of total nitrogen (T-N) to be 3.0 mg / l according ...

AI Technical Summary

Problems solved by technology

[0005] 1. The existing domestic sewage treatment equipment cannot provide effective denitrification function, and the sewage is easy to overflow from the surface. The sewage overflows without treatment, and the treatment equipment loses its treatment effect, and the nitrogen content in domestic sewage The concentration cannot be treated to the standard value of discharge, so the treated sewage cannot be discharged or connected to agricultural drainage channels

[0006] 2. In the existing domestic sewage treatment equipment, the anaerobic tank is not equipped with contact filter material as a biological carrier, the residence time of sewage must be long, and the required effective volume must also be large

[0007] 3. The existing domestic sewage treatment equipment cannot provide a growth environment and attachment space for self-supporting microorganisms (denitrative bacteria, etc.) because there is no contact filter material in the anaerobic tank, which also leads to poor denitrification effect main cause

[0008] 4. The existing domestic sewage treatment equipment is designed to discharge to the discharge pipe after domestic sewage treatment, which is prone to short-flow phenomenon, because the influent sewage is not easy to effectively stay in each tank, but directly flows out from the outlet, causing each The volume of the treatment tank cannot be fully utilized, which is also one of the factors that can not bring out the efficiency

[0009] 5. The reaction rate of the aeration tank of the existing domestic sewage treatment equipment is slow, and it takes a long time for sedimentation to separate the sludge

[0010] 6. Existing domestic sewage treatment equipment, its aeration tank does not provide a suitable growth environment and attachment space for nitrifying bacteria

[0011] 7. The capacity (air volume) of the existing domestic sewage treatment equipment is insufficient to provide the air volume required by the aeration tank and the return pump at the same time, so that the dissolved oxygen in the aeration tank is insufficient, and the biological decomposition of organic matter and nitrification are limited.

[0013] 9. The existing domestic sewage treatment equipment, the water quality of the treated water is unstable, due to the combination of factors such as short flow, insufficient air volume of the blower, and insufficient return flow, the quality of the treated water cannot be guaranteed

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