Valveless rapid sand filter deep treatment underground integrated sewage treatment method

Abstract

The invention discloses a valveless rapid sand filter deep treatment underground integrated sewage treatment method. The method comprises the following steps: a grating tank, a water accumulation tank, a regulating tank, an anoxic tank, an aerobic tank, a secondary settling tank, a sand filter tank and a clear water tank are arranged below the ground surface, the opening of the grating tank is level to the ground surface so as to facilitate water inflowing, a water accumulation tank lifting pump is arranged at the bottom of the water accumulation tank, a regulating tank lifting pump is arranged at the bottom of the regulating tank, a jet device is arranged in the aerobic tank, an inclined tube settling dish is arranged in the middle of the secondary settling tank, the sand filter tank comprises a filtering area and a clear water area, a water distribution main pipe is arranged at the inner bottom of the filtering area and positioned in a supporting layer, a filter material layer is arranged on the upper part of the supporting layer, a clear water outlet valve and a backwashing valve are not needed to be arranged in the sand filter tank respectively, a pipeline with larger diameter serves as a backwashing pipe and takes the difference between the backwashing water quantity and treatment water quantity of the sand filter tank as a designed flow, and a stop valve is arranged on the backwashing pipe.

Description

technical field [0001] The invention relates to sewage treatment, which is an underground integrated sewage treatment method for advanced treatment in a valveless rapid sand filter. Background technique [0002] Sand filters are usually used for advanced treatment of sewage to solve the problem of excessive suspended solids in the secondary biological treatment. However, when the existing sand filter is used in the buried integrated sewage system, it is necessary to install a The height of the switching valve for water filtration and backwashing is generally 2-2.5 meters from the ground, which brings great inconvenience to the management and operation of the sewage treatment system. For this reason, many buried sewage systems cannot use sand filters, or use high-cost, complex-structured decontamination tanks to replace sand filters. However, these methods bring new problems that are not easy to solve, resulting in buried sewage treatment systems. The quality of filtered wat...

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Problems solved by technology

[0002] Sand filters are usually used for advanced treatment of sewage to solve the problem of excessive suspended solids in the secondary biological treatment. However, when the existing sand filter is used in the buried integrated sewage system, it is necessary to install a The switching valve for water filtration and backwashing, the height of the valve from the ground is generally 2-2.5 meters, which brings great inconvenience to the management and operation of the sewage treatment system

For this reason, many buried sewage systems cannot use sand filters, or use high-cost, complex-structured decontamination tanks to replace sand filters. However, these methods bring new problems that are not easy to solve, resulting in buried sewage treatment systems. The quality of filtered water is difficult to meet the treatment standard

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