CN202297244U - Sewage treatment system with combination of biochemical flocculation and aerated biofilter - Google Patents

Abstract

The utility model relates to a combined sewage treatment system of biochemical flocculation and biological aeration filter, which relates to a sewage treatment system. The utility model aims to solve the problems of increased operation cost and inconvenient management caused by the high load of the existing advanced sewage treatment system. The two ends of the dosing pipe are respectively connected with the sewage inlet pipe and the coagulant tank. The biochemical flocculation reaction tank and the sedimentation tank are connected through the flow-through pipe. The first aeration head is set in the biochemical flocculation reaction tank. The first aeration pipe The two ends are respectively connected with the first aeration head and the first aeration pump; the two ends of the first sludge return pipe are respectively connected with the sludge outflow pipe and the sludge activation tank, and the second aeration head is set in the sludge activation tank. The two ends of the second aeration pipe are respectively connected with the second aeration head and the second aeration pump, the sludge activation tank is connected with the biochemical flocculation reaction tank through the second sludge return pipe, and the sedimentation tank is connected with the biological aerated filter through the second sludge return pipe. The first water outlet pipe is connected. The utility model is used in domestic sewage treatment.

Description

Biochemical flocculation and biological aerated filter combined sewage treatment system

technical field

The utility model relates to a sewage treatment system, in particular to a combined sewage treatment system of biochemical flocculation and aerated biological filter, which belongs to the technical field of water treatment.

Background technique

With the development of industrialization and the improvement of people's material living standards, the discharge of a large amount of industrial wastewater and domestic sewage has caused varying degrees of pollution to water sources. The existence of trace organic matter and toxic and harmful substances has exacerbated the deterioration of water quality, and the degree of pollution has become increasingly serious.

The biological aerated filter (BAF) process is a new type of biological treatment process developed in Europe and the United States in the late 1980s. The world's first biological aerated filter was put into operation in France in 1981. In the early 1990s, BAF (aerated biological filter) technology has been basically mature, especially in Europe, America and Japan have been widely promoted. This process has the functions of removing SS (substance mass), COD (chemical oxygen demand), BOD (biochemical acid requirement), nitrification, nitrogen removal, phosphorus removal, and AOX (harmful substance) removal. Its characteristics are integrated Bio-oxidation and interception of suspended solids are integrated, saving the subsequent secondary settling tank, which has large volume load, large hydraulic load, short hydraulic retention time, less infrastructure investment, good effluent quality, low energy consumption and low operating costs. The main disadvantage of BAF is that it has higher requirements for SS in the influent. In order to make it handle higher organic loads in a shorter hydraulic retention time and have the function of intercepting SS, the particle size of BAF fillers is generally relatively small. If the water SS is too high, the filter will reach the designed head loss in a short period of time and blockage will occur, resulting in frequent backwashing, which will increase operating costs and bring inconvenience to management. To sum up, the existing advanced sewage treatment system has the problems of increased operating costs and inconvenient management due to high load.

Utility model content

The purpose of the utility model is to solve the problems of increased operating costs and inconvenient management caused by the high load of the existing sewage advanced treatment system, and further provide a combined sewage treatment system of biochemical flocculation and biological aerated filter.

The technical scheme of the utility model is: the combined sewage treatment system of biochemical flocculation and biological aerated filter includes a sewage inlet pipe, a first aeration pump, a first aeration pipe, a dosing pipe, a dosing pump, and a coagulant tank , the first aeration head, biochemical flocculation reaction tank, flow-through pipe, sedimentation tank, first outlet pipe and sludge outflow pipe; the combined sewage treatment system of biochemical flocculation and biological aerated filter also includes the first sludge Return pipe, first sludge return pump, second aeration pump, second aeration pipe, second aeration head, sludge activation tank, second sludge return pump, second sludge return pipe, aerated organisms Filter tank, backwash water inlet pipe, second water outlet pipe, backwash pump, third water outlet pipe, backwash inlet pipe, third aeration pump, third aeration pipe, third aeration head and fourth aeration head The sewage inlet pipe is connected with the biochemical flocculation reaction tank, one end of the dosing pipe is connected with the sewage water inlet pipe, the other end of the dosing pipe is connected with the coagulant tank, and the dosing pump is installed on the dosing pipe, and flows through one end of the pipe It is connected with the biochemical flocculation reaction tank, the other end of the flow-through pipe is installed on the outer wall of the middle part of the sedimentation tank, and the flow-through pipe is connected with the sedimentation tank, and one end of the sludge outflow pipe is installed on the bottom end surface of the sedimentation tank, and the sludge outflow pipe is connected with the sedimentation tank The sedimentation tank is connected, the first aeration head is set in the biochemical flocculation reaction tank, one end of the first aeration pipe penetrates into the biochemical flocculation reaction tank and communicates with the first aeration head, and the other end of the first aeration pipe is connected to There is a first aeration pump; one end of the first sludge return pipe is connected to the sludge outflow pipe, the other end of the first sludge return pipe is connected to the sludge activation tank, and the first sludge return pump is installed on the first sludge On the return pipe, the second aeration head is set in the sludge activation tank, one end of the second aeration tube penetrates into the sludge activation tank and communicates with the second aeration head, and the other end of the second aeration tube is connected to the second aeration tank. The air pump, the sludge activation tank and the biochemical flocculation reaction tank are connected through the second sludge return pipe, the second sludge return pipe is installed with the second sludge return pump, and one end of the first outlet pipe is installed in the sedimentation tank. On the outer wall of the upper part, and the first water outlet pipe is connected with the sedimentation tank, the other end of the first water outlet pipe is installed on the lower outer wall of the biological aerated filter, and the first water outlet pipe is connected with the biological aerated filter tank, and the third water outlet pipe Installed on the lower outer wall of the biological aerated filter, and the third outlet pipe communicates with the biological aerated filter, the second outlet pipe is installed on the upper outer wall of the biological aerated filter, and the third outlet pipe communicates with the biological aerated filter The filter tank is connected, one end of the backwashing water inlet pipe is connected with the second water outlet pipe, the other end of the backwashing water inlet pipe is connected with the upper part of the biological aerated filter, the backwashing pump is installed on the backwashing water inlet pipe, the third aeration head and The fourth aeration head is installed in the biological aeration filter from top to bottom, the third aeration pump is placed outside the biological aeration filter, and the third aeration pump passes through the third aeration pipe and the third aeration head The third aeration pump communicates with the fourth aeration head through the backwash intake pipe.

Compared with the prior art, the utility model has the following effects: 1. The biochemical flocculation and aerated biological filter combined sewage treatment system of the utility model aerates the biochemical flocculation reaction pool to exert the microbial activity of the activated sludge, At the same time, it cooperates with chemical agents to adsorb and partially degrade the dissolved substances and fine unsuspendable solids in sewage, which improves the sewage treatment effect. 2. The enhanced reaction time of the biochemical flocculation reaction tank is short, which greatly improves the treatment capacity of domestic sewage. 3. The residence time of sewage in the biochemical flocculation reaction tank is short, and the sludge microorganisms in the sedimentation tank cannot fully metabolize. A sludge activation tank is added to activate the sludge in the sludge activation tank through aeration , to further restore the activity of microorganisms in the sludge, and then return the activated sludge with enhanced activity to the biochemical flocculation reaction tank. 4. The utility model divides sewage treatment into two stages: biochemical flocculation intensification stage and biological aerated filter advanced treatment stage. Through enhanced treatment, the load of sewage treatment in biological aerated filter is reduced, so that the effluent can reach the standard or be reused . The biochemical flocculation and biological aerated filter combined sewage treatment system of the utility model has low infrastructure investment and operating costs, is easy to manage, does not require a complicated operating system, and is not limited by climatic conditions, adapts to fluctuations in water volume and water quality, and realizes Effective removal of organic pollutants in domestic sewage.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the biochemical flocculation and biological aerated filter combined sewage treatment system of the present invention (the arrow in the figure indicates the direction of the medium).

Detailed ways

Specific Embodiment 1: This embodiment is described in conjunction with FIG. 1. The biochemical flocculation and biological aerated filter combined sewage treatment system of this embodiment includes a sewage inlet pipe 1, a first aeration pump 3, a first aeration pipe 4, Dosing pipe 8, dosing pump 9, coagulant tank 10, first aeration head 12, biochemical flocculation reaction tank 13, flow through pipe 14, sedimentation tank 15, first water outlet pipe 16 and sludge outflow pipe 17; The biochemical flocculation and biological aerated filter combined sewage treatment system also includes a first sludge return pipe 18, a first sludge return pump 19, a second aeration pump 21, a second aeration pipe 22, a second aeration Gas head 6, sludge activation tank 23, second sludge return pump 24, second sludge return pipe 25, biological aerated filter 2, backwash water inlet pipe 26, second water outlet pipe 27, backwash pump 28, The third outlet pipe 29, the backwash inlet pipe 30, the third aeration pump 31, the third aeration pipe 32, the third aeration head 33 and the fourth aeration head 34; the sewage inlet pipe 1 and the biochemical flocculation reaction tank 13 is connected, one end of the dosing pipe 8 is connected with the sewage inlet pipe 1, the other end of the dosing pipe 8 is connected with the coagulant tank 10, the dosing pump 9 is installed on the dosing pipe 8, and one end of the pipe 14 flows through the biological The chemical flocculation reaction tank 13 communicates, and the other end of the flow-through pipe 14 is installed on the outer wall of the middle part of the sedimentation tank 15, and the flow-through pipe 14 communicates with the sedimentation tank 15, and one end of the sludge outflow pipe 17 is installed on the bottom end surface of the sedimentation tank 15, and The sludge outflow pipe 17 communicates with the sedimentation tank 15, the first aeration head 12 is arranged in the biochemical flocculation reaction tank 13, and one end of the first aeration pipe 4 penetrates into the biochemical flocculation reaction tank 13 and the first aeration The head 12 is connected, and the other end of the first aeration pipe 4 is connected with the first aeration pump 3; one end of the first sludge return pipe 18 is connected with the sludge outflow pipe 17, and the other end of the first sludge return pipe 18 is connected with the first sludge return pipe 18. The sludge activation tank 23 is connected, the first sludge return pump 19 is installed on the first sludge return pipe 18, the second aeration head 6 is arranged in the sludge activation tank 23, and one end of the second aeration pipe 22 penetrates into the The sludge activation tank 23 communicates with the second aeration head 6, and the other end of the second aeration pipe 22 is connected with a second aeration pump 21, and the sludge activation tank 23 and the biochemical flocculation reaction tank 13 pass through the second sewage The mud return pipe 25 communicates, the second sludge return pipe 25 is equipped with a second sludge return pump 24, and one end of the first outlet pipe 16 is installed on the upper outer wall of the sedimentation tank 15, and the first outlet pipe 16 is connected to the sedimentation tank 15 connected, the other end of the first outlet pipe 16 is installed on the lower outer wall of the biological aerated filter 2, and the first outlet pipe 16 communicates with the biological aerated filter 2, and the third outlet pipe 29 is installed on the biological aerated filter On the lower outer wall of the pool 2, and the third outlet pipe 29 communicates with the biological aerated filter 2, the second outlet pipe 27 is installed on the upper outer wall of the biological aerated filter 2, and the third outlet pipe 29 communicates with the biological aerated filter The filter tank 2 is connected, one end of the backwash water inlet pipe 26 is connected with the second water outlet pipe 27, the other end of the backwash water inlet pipe 26 is connected with the upper part of the biological aerated filter tank 2, and the backwash water pump 28 is installed on the backwash water inlet pipe 26 , The third aeration head 33 and the fourth aeration head 34 are arranged in the biological aerated filter tank 2 from top to bottom, the third aeration pump 31 is placed outside the biological aeration filter tank 2, and the third aeration pump 31 The third aeration pipe 30 communicates with the third aeration head 33 , and the third aeration pump 31 communicates with the fourth aeration head 34 through the backwash intake pipe 30 .

Specific embodiment two: this embodiment is described in conjunction with Fig. 1, the biochemical flocculation and biological aerated filter combined sewage treatment system of this embodiment also includes a first flow meter 5 and a second flow meter 20, the first flow meter 5 is installed on the first aeration pipe 4, and the second flowmeter 20 is installed on the second aeration pipe 22. Such setting makes it easy to control the aeration amount. Other compositions and connections are the same as in the first embodiment.

Working process: The working process of the utility model is illustrated in conjunction with Fig. 1. The domestic sewage flows into the biochemical flocculation reaction tank 13 through the sewage inlet pipe 1, and the flocculant and coagulant in the coagulant tank 10 are added through the dosing pipe 8 at the same time. Enter the biochemical flocculation reaction tank 13 for aeration, the chemical agent and the active sludge act synergistically for a short-term strengthening reaction, and the reacted sewage enters the sedimentation tank 15 for separation of mud and water. The sludge microorganisms that have not been fully metabolized in the sedimentation tank 15 are injected into the sludge activation tank 23 through the first sludge return pipe 18, aerated, and after the activity of the microorganisms in the sludge is restored, the sludge is reinjected into the biochemical In the flocculation reaction tank 13, the sludge production and the consumption of chemicals are reduced. The settled water enters the biological aerated filter 2 from the first water outlet pipe 16 to be deep-drained. Through two stages of intensive treatment and deep-drained water, the sewage can meet the discharge standard or be reused.

Claims (2)

1. A biochemical flocculation and biological aerated filter combined sewage treatment system, which includes a sewage inlet pipe (1), a first aeration pump (3), a first aeration pipe (4), and a dosing pipe (8 ), dosing pump (9), coagulant tank (10), first aeration head (12), biochemical flocculation reaction tank (13), flow through pipe (14), sedimentation tank (15), first outlet water pipe (16) and sludge outflow pipe (17); it is characterized in that: the biochemical flocculation and biological aerated filter combined sewage treatment system also includes a first sludge return pipe (18), a first sludge return pump (19), the second aeration pump (21), the second aeration pipe (22), the second aeration head (6), the sludge activation tank (23), the second sludge return pump (24), the second Second sludge return pipe (25), biological aerated filter (2), backwash water inlet pipe (26), second water outlet pipe (27), backwash pump (28), third water outlet pipe (29), reverse Rinse intake pipe (30), the 3rd aeration pump (31), the 3rd aeration pipe (32), the 3rd aeration head (33) and the 4th aeration head (34); Sewage water inlet pipe (1) and The biochemical flocculation reaction pool (13) is communicated, and one end of the dosing pipe (8) is communicated with the sewage inlet pipe (1), and the other end of the dosing pipe (8) is communicated with the coagulant tank (10), and the dosing pipe ( 8) is equipped with a dosing pump (9), one end of the flow-through pipe (14) communicates with the biochemical flocculation reaction tank (13), and the other end of the flow-through pipe (14) is installed on the outer wall of the middle part of the sedimentation tank (15), and The flow-through pipe (14) is communicated with the sedimentation tank (15), and one end of the sludge outflow pipe (17) is installed on the bottom end surface of the sedimentation tank (15), and the sludge outflow pipe (17) is communicated with the sedimentation tank (15), The first aeration head (12) is arranged in the biochemical flocculation reaction tank (13), and one end of the first aeration pipe (4) penetrates into the biochemical flocculation reaction tank (13) and the first aeration head (12) ), the other end of the first aeration pipe (4) is connected with the first aeration pump (3); one end of the first sludge return pipe (18) is connected with the sludge outflow pipe (17), and the first sludge The other end of the return pipe (18) communicates with the sludge activation tank (23), the first sludge return pump (19) is installed on the first sludge return pipe (18), and the second aeration head (6) is arranged on In the sludge activation tank (23), one end of the second aeration pipe (22) penetrates into the sludge activation tank (23) to communicate with the second aeration head (6), and the other end of the second aeration pipe (22) Connected with the second aeration pump (21), the sludge activation tank (23) and the biochemical flocculation reaction tank (13) are connected through the second sludge return pipe (25), and the second sludge return pipe (25) A second sludge return pump (24) is installed on the top, and one end of the first outlet pipe (16) is installed on the upper outer wall of the sedimentation tank (15), and the first outlet pipe (16) communicates with the sedimentation tank (15), The other end of the first water outlet pipe (16) is installed on the lower outer wall of the biological aerated filter (2), and the first water outlet pipe (16) communicates with the biological aerated filter (2), and the third water outlet The pipe (29) is installed on the lower outer wall of the biological aerated filter (2), and the third outlet pipe (29) communicates with the biological aerated filter (2), and the second outlet pipe (27) is installed on the biological aerated filter On the upper outer wall of the filter (2), and the third outlet pipe (29) communicates with the biological aerated filter (2), one end of the backwash inlet pipe (26) communicates with the second outlet pipe (27), and the backwash inlet The other end of the water pipe (26) communicates with the upper part of the biological aerated filter (2), the backwash pump (28) is installed on the backwash water inlet pipe (26), the third aeration head (33) and the fourth aeration The head (34) is arranged in the biological aerated filter (2) from top to bottom, the third aeration pump (31) is placed outside the biological aerated filter (2), and the third aeration pump (31) passes through The third aeration pipe (30) communicates with the third aeration head (33), and the third aeration pump (31) communicates with the fourth aeration head (34) through the backwash intake pipe (30). 2. The combined sewage treatment system of biochemical flocculation and biological aerated filter according to claim 1, characterized in that: the combined sewage treatment system of biochemical flocculation and biological aerated filter also includes a first flow meter (5) and A second flow meter (20), the first flow meter (5) is installed on the first aeration pipe (4), and the second flow meter (20) is installed on the second aeration pipe (22).

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