SPLIT TYPE CONTINUOUS OPERATION MICRO-GRID DYNAMIC MEMBRANE BIOREACTOR

Abstract

Disclosed is a split type continuous operation micro-grid dynamic membrane bioreactor. The split type continuous operation micro-grid dynamic membrane bioreactor comprises a biological treatment unit and a drum type dynamic membrane filtration unit, wherein the biological treatment unit comprises a microbiological treatment tank, and a water inlet pipe is arranged on the microbiological treatment tank; the drum type dynamic membrane filtration unit comprises a filter tank, and a drum micro-grid dynamic membrane mechanism is arranged in the filter tank; the drum micro-grid dynamic membrane mechanism comprises a filter drum, a backwashing device is arranged above the filter drum, and a sludge collecting bank is arranged in the filter drum; a water outlet is formed in the bottom of the filter tank; a mixed liquid pipe is arranged between the microbiological treatment tank and the filter drum; and a sludge discharge header pipe is arranged on the sludge collecting tank.

Claims

1. A split type continuous operation micro-grid dynamic membrane bioreactor, comprising a biological treatment unit (10) and a drum type dynamic membrane filtration unit (20), wherein the biological treatment unit (10) comprises a microbiological treatment tank (11), and the microbiological treatment tank (11) comprises an aerobic treatment tank, an anoxic treatment tank and an anaerobic treatment tank; the drum type dynamic membrane filtration unit (20) comprises a filter tank (21), and a drum micro-grid dynamic membrane mechanism is arranged in the filter tank (21); the drum dynamic membrane mechanism comprises a filter drum (22), a backwashing device (24) used for washing the filter drum (22) and keeping the thickness of a dynamic biological membrane (23) formed on the filter drum (22) within a set thickness range is arranged above the filter drum (22), and a sludge collecting tank (25) used for collecting the washed dynamic biological membrane filter layer is arranged in the filter drum (22); a water outlet (26) which is formed in the lower part of the filter drum (22) and enables the water level of the filter tank (21) to be lower than that in the microbiological treatment tank (11) is formed in the bottom of the filter tank (21); a mixed liquid pipe (30) used for enabling sewage sludge mixed liquid to flow into the filter drum (22) from the microbiological treatment tank (11) is arranged between the microbiological treatment tank (11) and the filter drum (22); and a sludge discharge header pipe (31) is arranged on the sludge collecting tank (25).

2. The split type continuous operation micro-grid dynamic membrane bioreactor according to claim 1, wherein a filter medium is arranged on the filter drum (22), the filter medium adopts a stainless steel wire mesh or non-woven filter cloth, and the filter pore diameter of the filter medium is 20-500 μm.

3. The split type continuous operation micro-grid dynamic membrane bioreactor according to claim 1, wherein a Y-union (32) is arranged on the sludge discharge header pipe (31), a sludge discharge pipe (33) and a sludge return pipe (34) are arranged on the Y-union (32), the sludge return pipe (34) communicates with the microbiological treatment tank (11), and a sludge discharge control mechanism for directly discharging sludge from the sludge discharge pipe (33) or enabling the sludge to flow back into the microbiological treatment tank (11) through the sludge return pipe (34) is arranged between the sludge discharge pipe (33) and the sludge return pipe (34).

4. The split type continuous operation micro-grid dynamic membrane bioreactor according to claim 3, wherein the sludge discharge control mechanism comprises a sludge discharge valve (35) arranged on the sludge discharge pipe (33); or, opening and closing valves are arranged on the sludge discharge pipe (33) and the sludge return pipe (34) respectively.

5. The split type continuous operation micro-grid dynamic membrane bioreactor according to claim 1, wherein a backwashing water port (27) is formed in the bottom of the filter tank (21), a backwashing water pipe (28) is arranged between the backwashing water port (27) and a water inlet of the backwashing device (24), and a backwashing water pump (29) is arranged on the backwashing water pipe (28).

6. The split type continuous operation micro-grid dynamic membrane bioreactor according to claim 1, wherein the filter drum (22) comprises a filter cartridge (221), two ends of the filter cartridge (221) are provided with sealing plates (222) respectively, a central hole (223) coaxial with the filter cartridge (221) is formed in one of the sealing plates (222), and the inner diameter of each central hole (223) is smaller than that of the filter cartridge (221).

7. The split type continuous operation micro-grid dynamic membrane bioreactor according to claim 6, wherein one end of the mixed liquid pipe (30) is connected with the microbiological treatment tank (11), the other end of the mixed liquid pipe (30) stretches into the filter drum (22) through the central holes (223), and the overflow water level of the mixed liquid pipe (30) is equal to the elevations of the lowest points of the central holes (223).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to make the objects, technical schemes and beneficial effects of the present disclosure clearer, the present disclosure provides the following attached figures for illustration:

[0034] FIG. 1 is a structural schematic diagram of an embodiment of a split type continuous operation micro-grid dynamic membrane bioreactor in the present disclosure; and

[0035] FIG. 2 is a structural schematic diagram of a drum type dynamic membrane filtration unit.

REFERENCE SIGNS IN DRAWINGS

[0036] 10, biological treatment unit; 11, microbiological treatment tank; 12, water inlet pipe; 13, water inlet valve;

[0037] 20, drum type dynamic membrane filtration unit; 21, filter tank; 22, filter drum; 221, filter cartridge; 222, sealing plate; 223, central hole; 23, dynamic biological membrane; 24, backwashing device; 25, sludge collecting tank; 26, water outlet; 27, backwashing water port; 28, backwashing water pipe; 29, backwashing water pump;

[0038] 30, mixed liquid pipe; 31, sludge discharge header pipe; 32, Y-union; 33, sludge discharge pipe; 34, sludge return pipe; and 35, sludge discharge valve.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The present disclosure is further described in conjunction with the attached figures and specific embodiments so that those skilled in the art can better understand and implement the present disclosure, but the embodiments are not intended to be limitation of the present disclosure.

[0040] As shown in FIG. 1, FIG. 1 is a structural schematic diagram of an embodiment of a split type continuous operation micro-grid dynamic membrane bioreactor in the present disclosure. The split type continuous operation micro-grid dynamic membrane bioreactor in the embodiment comprises a biological treatment unit 10 and a drum type dynamic membrane filtration unit 20.

[0041] Specifically, the biological treatment unit 10 comprises a microbiological treatment tank 11, a water inlet pipe 12 is arranged on the microbiological treatment tank 11, a water inlet valve 13 is arranged on the water inlet pipe 12 in the embodiment, and the water inlet amount of sewage can be controlled through the water inlet valve 13, so that the water level of the microbiological treatment tank 11 is kept within a set range.

[0042] The drum type dynamic membrane filtration unit 20 in the embodiment comprises a filter tank 21, and a drum dynamic membrane mechanism is arranged in the filter tank 21. The drum dynamic membrane mechanism in the embodiment comprises a filter drum 22, a backwashing device 24 used for washing the filter drum 22 and keeping the thickness of a dynamic biological membrane 23 formed on the filter drum 22 within a set thickness range is arranged above the filter drum 22, and a sludge collecting tank 25 used for collecting the washed dynamic biological membrane is arranged in the filter drum 22. A water outlet 26 which is formed in the lower part of the filter drum 22 and enables the water level of the filter tank 21 to be lower than that in the microbiological treatment tank 11 is formed in the bottom of the filter tank 21. A filter medium is arranged on the filter drum 22, the filter medium adopts a stainless steel wire mesh or non-woven filter cloth, and the filter pore diameter of the filter medium is 20-500μm, so that the requirement of forming the dynamic biological membrane 23 can be met.

[0043] A mixed liquid pipe 30 used for enabling sewage sludge mixed liquid to flow into the filter drum 22 from the microbiological treatment tank 11 is arranged between the microbiological treatment tank 11 and the filter drum 22 in the embodiment; and a sludge discharge header pipe 31 is arranged on the sludge collecting tank 25.

[0044] Further, a Y-union 32 is arranged on the sludge discharge header pipe 31, a sludge discharge pipe 33 and a sludge return pipe 34 are arranged on the Y-union 32, the sludge return pipe 34 communicates with the microbiological treatment tank 11, and a sludge discharge control mechanism for directly discharging sludge from the sludge discharge pipe 33 or enabling the sludge to flow back into the microbiological treatment tank 11 through the sludge return pipe 34 is arranged between the sludge discharge pipe 33 and the sludge return pipe 34. The sludge discharge control mechanism in the present embodiment comprises a sludge discharge valve 35 arranged on the sludge discharge pipe 33. When the sludge discharge valve 35 is closed, the sludge flows back into the microbiological treatment tank 11 from the sludge return pipe 34 so as to maintain the amount of the sludge in the microbiological treatment tank 11, so that the biological sewage treatment process is efficient and continuous; and when the sludge discharge valve 35 is opened, the sludge is directly discharged from the sludge discharge pipe 33, and the amount of the sludge discharged from the sludge discharge pipe 33 can be accurately controlled by controlling the opening and closing time of the sludge discharge valve 35. Definitely, the sludge discharge control mechanism can also be realized in other various modes, for example, opening and closing valves can be arranged on the sludge discharge pipe 33 and the sludge return pipe 34 respectively, and the technical purpose that the sludge is discharged from the sludge discharge pipe 33 or flows back from the sludge return pipe 34 is achieved by respectively controlling the opening and closing of the opening and closing valves.

[0045] Further, a backwashing water port 27 is formed in the bottom of the filter tank 21 in the embodiment, a backwashing water pipe 28 is arranged between the backwashing water port 27 and a water inlet of the backwashing device 24, and a backwashing water pump 29 is arranged on the backwashing water pipe 28, so that cyclic utilization of water is realized without the need of an external water source.

[0046] Further, the filter drum 22 comprises a filter cartridge 221, two ends of the filter cartridge 221 are provided with sealing plates 222 respectively, a central hole 223 coaxial with the filter cartridge 221 is formed in one of the sealing plates 222, and the inner diameter of each central hole 223 is smaller than that of the filter cartridge 221. As shown in FIG. 2, one end of the mixed liquid pipe 30 in the embodiment is connected with the microbiological treatment tank 11, the other end of the mixed liquid pipe 30 stretches into the filter drum 22 through the central holes 223, and the overflow water level of the mixed liquid pipe 30 is equal to the elevations of the lowest points of the central holes 223, so that when the water level in the microbiological treatment tank 11 is higher than the elevations of the lowest points of the central holes 223, the mixed liquid automatically overflows to the filter drum 22 through the mixed liquid pipe 30 for filtration. In the embodiment, the filter drum 22 is manufactured by adopting the filter medium, the filter medium adopts a stainless steel wire mesh or non-woven filter cloth, and the filter pore diameter of the filter medium is 20-500 μm, so that the requirement of forming the dynamic biological membrane 23 can be met.

[0047] According to the split type continuous operation micro-grid dynamic membrane bioreactor in the embodiment, by arranging the biological treatment unit, pollutants in the sewage are decomposed and removed by utilizing microorganisms growing in the microbiological treatment tank, so that the technical effect of biological treatment of the sewage is achieved; by arranging the drum type dynamic membrane filtration unit, suspended solids in the mixed liquid are intercepted by utilizing the filter drum to form the dynamic biological membrane, so that the sewage is filtered, the sewage treatment requirement can be met, and the effluent quality is ensured; and according to the split type continuous operation micro-grid dynamic membrane bioreactor in the embodiment, the microbiological treatment tank and the filter tank are arranged in a split mode, namely, biological purification treatment and dynamic biological membrane filtration treatment are independently carried out in two steps, when the filter drum is subjected to backwashing, the biological treatment unit is not affected, and backwashing and filtration treatment of the filter drum can be simultaneously carried out, so that the technical effect of continuous operation can be realized.

[0048] The mixed liquid pipe is arranged between the filter drum and the microbiological treatment tank, so that a communicating vessel structure can be formed between the filter drum and the microbiological treatment tank, namely, the water level in the filter drum is always kept equal to that of the microbiological treatment tank, and equipment such as a water pump does not need to be independently arranged between the microbiological treatment tank and the filter tank; meanwhile, the water outlet is formed in the lower part of the filter drum, so that the water level in the filter tank is always lower than that of the microbiological treatment tank, namely, the water level in the filter drum can be higher than that in the filter tank, and under the action of water level pressure difference, the micro-grid filter drum can achieve automatic filtration without additional equipment such as a water production pump; and therefore, the split type continuous operation micro-grid dynamic membrane bioreactor in the embodiment can automatically operate and achieve the technical purposes of energy conservation and consumption reduction.

[0049] The suspended solids in the mixed liquid are intercepted on the filter drum to form the dynamic biological membrane, and the dynamic biological membrane has the advantages of being low in manufacturing cost, short in membrane formation time, good in permeability, high in membrane flux, high in anti-pollution capacity, good in effluent quality and the like.

[0050] In conclusion, the split type continuous operation micro-grid dynamic membrane bioreactor in the embodiment can realize continuous operation, has the advantages of low manufacturing cost and low operation energy consumption, and can effectively ensure the quality of effluent water.

[0051] The embodiments described above are only preferred embodiments to fully illustrate the present disclosure, and the scope of protection of the present disclosure is not limited to this. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present disclosure are within the scope of protection of the present disclosure. The protection scope of the present disclosure is based on the claims.