Sewage treatment system and process utilizing filamentous bacteria and controlling sludge bulking

Abstract

The invention provides a sewage treatment system utilizing filamentous bacteria and controlling sludge bulking. The sewage treatment system comprises a grating, an air floatation tank, a sludge-membrane mixed biological tank and a membrane separation system which are connected in sequence, and the mud-membrane mixed biological tank comprises a degassing tank, an anaerobic tank, an anoxic tank and an aerobic tank. The invention also discloses a process of the system. According to the sewage treatment system, physicochemical treatment and biological decomposition are coordinated and matched, filamentous bacteria are used for sewage treatment, the filamentous bacteria are controlled to be in a good state, sludge bulking harm caused by excessive reproduction of the filamentous bacteria is avoided, the degradation advantage of the filamentous bacteria on pollutants is utilized, the treatment efficiency of all links is improved, meanwhile, effluent quality and operation stability of a sewage plant are improved, and energy conservation and consumption reduction are achieved.

Description

technical field

[0001] The invention relates to the technical field of sewage purification, in particular to a sewage treatment system and process which utilize filamentous bacteria and control sludge bulking. Background technique

[0002] Sewage treatment plants in cold regions of our country tend to have a dry winter and little rain, residents like to eat meat, and the breeding and slaughtering industry is developed. Therefore, urban sewage generally has the characteristics of high pollutant concentration, high content of fatty substances, and low influent temperature, and long residence time and low reaction rate often lead to low sludge load in sewage plant operation. Sludge bulking is generally caused by filamentous bacteria, which will cause the sludge to become lighter, swollen, and sedimentation performance to deteriorate. , if control measures are not taken, the continuous loss of sludge will cause a sharp decrease in the number of microorganisms in the aeration ta...

Examples

Embodiment 1

[0026] Embodiment 1 of the present invention: a sewage treatment system utilizing filamentous bacteria and controlling sludge bulking:

[0027] Including grid 1, air flotation tank 2, mud film mixed biological tank and membrane separation system 7 connected in sequence; said mud membrane mixed biological tank includes degassing tank 3, anaerobic tank 4, anoxic tank 5 and aerobic tank 6 ; The bottom of the degassing tank 3 is provided with a stirring paddle; a sludge return pipe and a return pump are provided between the membrane separation system 7 and the anaerobic tank 4; There is a sludge return pipe; the air flotation tank 2 is connected with a PAC dosing device; the anaerobic tank 4, the anoxic tank 5, and the aerobic tank 6 are equipped with fixed biological fillers; the anaerobic tank 4 and the anoxic tank The inside of the tank 5 is provided with a flow device; the bottom of the aerobic tank 6 is provided with an aerator; the membrane separation system 7 includes a mem...

Embodiment 2

[0028] Embodiment 2: A sewage treatment system utilizing filamentous bacteria and controlling sludge bulking:

[0029] Including grid 1, air flotation tank 2, mud film mixed biological tank and membrane separation system 7 connected in sequence; said mud membrane mixed biological tank includes degassing tank 3, anaerobic tank 4, anoxic tank 5 and aerobic tank 6 .

Embodiment 3

[0030] Embodiment 3: A sewage treatment system utilizing filamentous bacteria and controlling sludge bulking:

[0031] Including grid 1, air flotation tank 2, mud film mixed biological tank and membrane separation system 7 connected in sequence; said mud membrane mixed biological tank includes degassing tank 3, anaerobic tank 4, anoxic tank 5 and aerobic tank 6 ; The bottom of the degassing tank 3 is provided with a stirring paddle; a sludge return pipe and a return pump are provided between the membrane separation system 7 and the anaerobic tank 4; There is a sludge return pipe.

technical field

[0001] The invention relates to the technical field of sewage purification, in particular to a sewage treatment system and process which utilize filamentous bacteria and control sludge bulking. Background technique

[0002] Sewage treatment plants in cold regions of our country tend to have a dry winter and little rain, residents like to eat meat, and the breeding and slaughtering industry is developed. Therefore, urban sewage generally has the characteristics of high pollutant concentration, high content of fatty substances, and low influent temperature, and long residence time and low reaction rate often lead to low sludge load in sewage plant operation. Sludge bulking is generally caused by filamentous bacteria, which will cause the sludge to become lighter, swollen, and sedimentation performance to deteriorate. , if control measures are not taken, the continuous loss of sludge will cause a sharp decrease in the number of microorganisms in the aeration ta...

Examples

Embodiment 1

[0026] Embodiment 1 of the present invention: a sewage treatment system utilizing filamentous bacteria and controlling sludge bulking:

[0027] Including grid 1, air flotation tank 2, mud film mixed biological tank and membrane separation system 7 connected in sequence; said mud membrane mixed biological tank includes degassing tank 3, anaerobic tank 4, anoxic tank 5 and aerobic tank 6 ; The bottom of the degassing tank 3 is provided with a stirring paddle; a sludge return pipe and a return pump are provided between the membrane separation system 7 and the anaerobic tank 4; There is a sludge return pipe; the air flotation tank 2 is connected with a PAC dosing device; the anaerobic tank 4, the anoxic tank 5, and the aerobic tank 6 are equipped with fixed biological fillers; the anaerobic tank 4 and the anoxic tank The inside of the tank 5 is provided with a flow device; the bottom of the aerobic tank 6 is provided with an aerator; the membrane separation system 7 includes a mem...

Embodiment 2

[0028] Embodiment 2: A sewage treatment system utilizing filamentous bacteria and controlling sludge bulking:

[0029] Including grid 1, air flotation tank 2, mud film mixed biological tank and membrane separation system 7 connected in sequence; said mud membrane mixed biological tank includes degassing tank 3, anaerobic tank 4, anoxic tank 5 and aerobic tank 6 .

Embodiment 3

[0030] Embodiment 3: A sewage treatment system utilizing filamentous bacteria and controlling sludge bulking:

[0031] Including grid 1, air flotation tank 2, mud film mixed biological tank and membrane separation system 7 connected in sequence; said mud membrane mixed biological tank includes degassing tank 3, anaerobic tank 4, anoxic tank 5 and aerobic tank 6 ; The bottom of the degassing tank 3 is provided with a stirring paddle; a sludge return pipe and a return pump are provided between the membrane separation system 7 and the anaerobic tank 4; There is a sludge return pipe.

Images