CN106315845B

CN106315845B - Plug flow type anaerobic digestion reactor

Info

Publication number: CN106315845B
Application number: CN201610951076.1A
Authority: CN
Inventors: 陈赟; 金慧宁; 李仙光; 李晨彬; 王风庆; 王益栋; 李习武; 张进锋
Original assignee: Welly Environmental Technology Group Co ltd
Current assignee: Welly Environmental Technology Group Co ltd
Priority date: 2016-11-02
Filing date: 2016-11-02
Publication date: 2023-06-23
Anticipated expiration: 2036-11-02
Also published as: CN106315845A

Abstract

The invention relates to a plug-flow anaerobic digestion reactor, wherein at least two porous baffles are arranged in an inner tank, a feed pipe arranged at the lower part of the inner tank is upward in outlet, a feed baffle is arranged at the bottom of the porous baffles of the inner tank and is opposite to the outlet of the feed pipe, and a conical sink with a discharge port is arranged at the bottom of the inner tank; the discharging pipe connected to the inner tank is communicated with the overflow tank, the inner tank with an open top extends into the outer tank, a biogas outlet is arranged at the top of the outer tank, a pulse pipeline is connected to the outlet of the outer tank, a pulse pump for generating liquid level change of the inner tank and the outer tank is arranged in parallel with a balance valve, one end of the balance valve and one end of the pulse pump are connected with the pulse pipeline, and the other end of the balance valve and the pulse pump are connected and communicated with the lower part of the inner tank. The anaerobic digestion device has the advantages of simple and reasonable structure and large treatment capacity, can avoid the short circuit phenomenon of materials in the anaerobic digestion process, and improves the anaerobic digestion efficiency.

Description

Plug flow type anaerobic digestion reactor

Technical Field

The invention relates to a plug-flow anaerobic digestion reactor, and belongs to the technical field of wastewater treatment.

Background

The anaerobic biological treatment technology is an efficient treatment mode that organic matters in materials are decomposed, metabolized and digested by anaerobic bacteria in an anaerobic state, so that the organic matter content in sewage is greatly reduced, and methane is generated.

The conventional fully-mixed anaerobic digestion reactor purifies organic pollutants by anaerobic activated sludge in a digestion tank, and after the organic pollutants enter the tank and are fully contacted with the original anaerobic activated sludge in the tank by stirring, the organic pollutants in the wastewater are converted into biogas by the adsorption, absorption and biodegradation of anaerobic microorganisms, and the fully-mixed anaerobic reactor adopts a stirrer, so that the phenomenon of material short circuit exists, and the problems of incomplete anaerobic digestion, long residence time and the like exist.

The existing pulse internal circulation anaerobic reactor adopts a pulse water distributor and an internal circulation anaerobic reactor, two cylindrical internal partition plates and a middle partition plate are coaxially arranged in the internal circulation anaerobic reactor, the upper end of the middle partition plate is flush with the upper end of a shell, the upper end of the internal partition plate is lower than the upper end of the middle partition plate, a biological mixing bed is arranged in a cylinder surrounded by the internal partition plate, sewage in a sewage storage tank of the pulse water distributor enters the internal circulation anaerobic reactor through a siphon downcomer, the low water level of the sewage storage tank of the pulse water distributor is higher than the high water level of the internal circulation anaerobic reactor, the water flow speed of the water inlet of the anaerobic reactor is increased through the periodicity of the pulse water distributor, the internal circulation of water flow is formed, suspended fillers fully distributed on the inner surface of the biological mixing bed generate fluidization and scrubbing, the contact between the biological membrane and the sewage is enhanced, and the sewage treatment effect is improved. However, the pulse internal circulation anaerobic reactor needs a pulse water distributor to realize the upward flow impact force of the inlet water, has a complex structure, is inconvenient to install, construct and maintain, adopts two cylindrical partition plates, has small treatment capacity, also has the phenomenon of material short circuit, and causes the problem of incomplete anaerobic digestion.

Disclosure of Invention

The invention aims to provide a plug-flow anaerobic digestion reactor which has simple and reasonable structure and large treatment capacity, can avoid the short circuit phenomenon of materials in the anaerobic digestion process and can improve the anaerobic digestion efficiency.

The technical scheme for achieving the purpose is as follows: a plug-flow anaerobic digestion reactor, characterized by: the anaerobic microorganism treatment device comprises an inner tank and an outer tank fixed at the upper part of the inner tank, wherein at least two porous partition plates which are uniformly distributed and provided with a plurality of through holes are arranged in the inner tank along the height direction, the porous partition plates divide the inner tank into treatment areas with different anaerobic microorganism concentrations, a feeding pipe is arranged at the lower part of the inner tank, an outlet of the feeding pipe faces upwards and is positioned at the middle part of the inner tank, a feeding baffle is arranged at the bottom of the porous partition plates, the feeding baffle is arranged at the upper part of the outlet of the feeding pipe and opposite to the outlet, and a conical sink with a discharge port is arranged at the bottom of the inner tank; the upper part of the inner tank is provided with an overflow tank, the top of the overflow tank is communicated with the inner tank, a discharging pipe connected to the inner tank is communicated with the overflow tank, a discharging valve is arranged on the discharging pipe, the inner tank with an open top stretches into the outer tank, the top of the outer tank is provided with a biogas outlet, the outlet of the outer tank is connected with a pulse pipeline, a balance valve and a pulse pump for generating liquid level change of the inner tank and the outer tank are arranged in parallel, one ends of the balance valve and the pulse pump are connected with the pulse pipeline, and the other ends of the balance valve and the pulse pump are connected and communicated with the lower part of the inner tank.

Wherein: the inner tank is internally fixed with a middle support, each porous partition plate is fixedly connected with the middle support, the middle support part is connected with the overflow groove, the bottom of the middle support is connected with a feeding baffle, the feeding baffle is connected with a cross beam or a bottom plate at the lower part of the inner tank through at least two support legs, and the conical sinking groove is positioned at the lower part of the cross beam or the bottom plate.

The center line of the outlet of the feeding pipe coincides with the center line of the conical sinking groove.

The bottom of the inner tank is connected to the base.

The anaerobic digestion reactor adopts an inner tank and an outer tank fixed at the upper part of the inner tank, wherein at least two porous partition plates uniformly distributed with a plurality of through holes are arranged in the inner tank along the height direction, so that materials can uniformly rise in the upward flow process in the tank, and no local short circuit phenomenon is generated. The anaerobic digestion inner tank reactor has the advantages that the local mixing and plug flow functions are realized by using the pulse pump connected between the inner tank and the outer tank, the traditional mechanical stirring and an external pulse water distributor are eliminated, the structure is simple, and the operation and the maintenance are convenient. According to the anaerobic digestion reactor, the outer tank is arranged at the top of the inner tank, the feeding pipe is arranged at the lower part of the inner tank, the discharging pipe communicated with the overflow groove is arranged at the upper part of the inner tank, when materials are subjected to anaerobic digestion in the reactor, through different anaerobic microorganism concentrations in different layers, the materials are ensured to react from bottom to top in a plurality of layers under the action of push flow, and are discharged from the top after being thoroughly digested, so that the short circuit phenomenon of the materials in the anaerobic digestion reactor is solved, organic components in waste water can be thoroughly digested in an anaerobic way, and the dehydration performance of the materials such as sludge after anaerobism is facilitated; meanwhile, as the organic components are thoroughly digested, the solid state after anaerobic discharge and dehydration has good shape stability, and malodor is avoided. According to the invention, the material enters the middle part of the inner tank from the feeding pipe, and the material can generate a backflow phenomenon under the action of the feeding baffle, so that uniform distribution is facilitated, and inorganic heavy sediment in the material is collected into the conical settling tank under the combination of the middle part feeding and the backflow action matched with the feeding baffle, and the sediment is periodically discharged from the discharge port of the conical settling tank, so that uniform distribution and sand setting are facilitated, and the normal operation of the reactor is ensured. Compared with traditional mechanical stirring, the plug-flow anaerobic digestion reactor has the advantages of high efficiency and low energy consumption due to the adoption of a pulse pump to generate pulse action.

Drawings

Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of the structure of a plug-flow anaerobic digestion reactor according to the present invention.

Fig. 2 is a schematic cross-sectional view of A-A of fig. 1.

FIG. 3 is a schematic illustration of the liquid levels of the inner and outer tanks of the plug-flow anaerobic digestion reactor of the present invention in equilibrium.

FIG. 4 is a schematic illustration of the liquid level of the inner and outer tanks of the plug-flow anaerobic digestion reactor of the present invention during pulsing.

FIG. 5 is a schematic illustration of the liquid level of the inner and outer tanks of the plug-flow anaerobic digestion reactor of the present invention in the pulse-peak state.

FIG. 6 is a schematic illustration of the liquid levels of the inner and outer tanks of the plug-flow anaerobic digestion reactor of the present invention during equilibration.

Wherein: 1-outer tank, 1-sight glass mouth, 1-2-marsh gas outlet, 1-3-outer joint, 2-inner tank, 2-1-first joint, 2-second joint, 3-discharging pipe, 4-middle support, 4-1-supporting foot, 5-porous baffle, 6-feeding baffle, 7-feeding pipe, 8-base, 9-conical sink tank, 10-pulse pump, 11-balance valve, 12-pulse pipeline, 13-overflow tank.

Detailed Description

The invention relates to a plug-flow anaerobic digestion reactor, which is shown in figures 1 and 2, and comprises an inner tank 2 and an outer tank 1 fixed at the upper part of the inner tank 2, wherein at least two porous partition boards 5 with a plurality of through holes are uniformly distributed in the inner tank 2 along the height direction, the porous partition boards 5 divide the inner tank 2 into treatment areas with different anaerobic microorganism concentrations; on the other hand, under the action of a plurality of through holes uniformly distributed and arranged on the porous partition plate 5, the materials can uniformly rise in the process of flowing upwards in the inner tank 2, and the phenomenon of local short circuit can not be generated.

As shown in fig. 1, a feed pipe 7 is arranged at the lower part of an inner tank 2, the outlet of the feed pipe 7 faces upwards and is positioned at the middle part of the inner tank 2, the inner tank 2 is provided with a feed baffle 6 at the bottom of a porous partition plate 5, the feed baffle 6 is arranged at the upper part of the outlet of the feed pipe 7 and opposite to the outlet, and a conical sink 9 with a discharge port is arranged at the bottom of the inner tank 2. Therefore, when materials enter the reactor from the feed pipe 7, the materials are caused to generate a backflow phenomenon under the action of the feed baffle 6 in the inner tank 2, so that uniform distribution of the materials in the inner tank 2 is facilitated, and meanwhile, inorganic heavy sediment in the materials can be collected to the conical sedimentation tank 9 at the bottom of the inner tank 2 due to the backflow effect of the feed baffle 6, so that the sediment is periodically discharged from the discharge port of the conical sedimentation tank 9, and the normal operation of the reactor is ensured.

As shown in figure 1, the upper part of an inner tank 2 of the invention is provided with an overflow groove 13, the top of the overflow groove 13 is communicated with the inner tank 2, the material subjected to anaerobic digestion treatment is positioned at the upper part of the inner tank 2 and is subjected to overflow groove 13, a discharging pipe 3 connected to the inner tank 2 is communicated with the overflow groove 13, a discharging valve is arranged on the discharging pipe 3, and the material subjected to thorough digestion is discharged through the discharging pipe 3. As shown in figure 1, an inner tank 2 with an open top extends into an outer tank 1, so that the inner tank 2 and the outer tank 1 form different liquid levels, a biogas outlet 1-2 is arranged at the top of the outer tank 1, and organic matters of materials are digested under the action of anaerobic microorganisms to generate biogas for collection and utilization. As shown in fig. 1, the top of the outer tank 1 is also provided with a sight glass opening 1-1, and the sight glass is arranged at the sight glass opening 1-1 so as to facilitate the observation of the condition in the tank.

As shown in fig. 1 and 2, a middle support 4 is fixed in the inner tank 2, each porous partition plate 5 is fixedly connected with the middle support 4, the upper part of the middle support 4 is connected with an overflow groove 13, the bottom of the middle support 4 is connected with a feeding baffle 6, the feeding baffle 6 is connected with a beam or a bottom plate at the lower part of the inner tank 2 through at least two support legs 4-1, a conical sinking groove 9 is positioned at the lower part of the beam or the bottom plate, and the porous partition plates 5, a discharging pipe 3 and the overflow groove 13 are supported through the middle support 4, so that the installation and the maintenance are convenient. As shown in figure 1, the center line of the outlet of the feeding pipe 7 is coincident with the center line of the conical sink trough 9, so that inorganic heavy sediment in the material can be collected in the conical sink trough 9.

As shown in figure 1, the outlet of an outer tank 1 is connected with a pulse pipeline 12, the bottom of the outer tank 1 is provided with a joint 1-3, the pulse pipeline 12 is connected to the joint 1-3, a pulse pump 10 and a balance valve 11 for generating liquid level change of an inner tank 2 and the outer tank 1 are arranged in parallel, one ends of the balance valve 11 and the pulse pump 10 are connected with the pulse pipeline 12, the other ends of the balance valve 11 and the pulse pump 10 are connected and communicated with the lower part of the inner tank 2, the lower part of the inner tank 2 is provided with a first joint 2-1 and a second joint 2-2, the other end of the balance valve 11 is arranged on the first joint 2-1 of the inner tank, the other end of the pulse pump 10 is arranged on the second joint 2-2, and pulse and balance circulation is performed through switching the balance valve 11 and the pulse pump 10, so that the generated liquid level change of the inner tank 2 and the outer tank 1 is integrally pushed, the anaerobic digestion efficiency is improved, and the residence time of materials in an anaerobic digestion reactor is reduced.

As shown in FIG. 1, the bottom of the inner tank 2 is connected to the base 8, and the inner tank is used for supporting the anaerobic digestion reactor through the base 8 and is installed and fixed on a foundation, so that engineering construction is facilitated.

Municipal sludge, excrement, kitchen waste and other organic waste liquid are homogenized and then conveyed to the plug-flow anaerobic digestion reactor through the feed pump, and the required anaerobic temperature is maintained. The working principle of the plug-flow anaerobic digestion reactor is shown in figures 3-6, and one pulse and balance cycle period is four phases, namely a balance state phase, a pulse process phase, a pulse highest state phase and a balance process phase. As shown in fig. 3, the liquid levels of the inner tank 2 and the outer tank 1 in the balanced state are identical, namely, the liquid levels are balanced, and then a pulse process is carried out; as shown in fig. 4, the pulse pump 10 is operated during the pulse process, the balance valve 11 is closed, and the material flows from the outer tank 1 to the inner tank 2 along the pulse pipeline 12, so that the liquid level of the inner tank 2 is increased and the liquid level of the outer tank 1 is reduced; as shown in fig. 5, until the highest pulse state is reached, the liquid level of the inner tank 2 reaches the highest level, and the liquid level of the outer tank 1 reaches the lowest level, and then the balancing process is performed; at this time, the pulse pump 10 is closed, the balance valve 11 is opened, the materials flow into the outer tank 1 from the inner tank 2 along the pulse pipe, the liquid level of the inner tank 2 is reduced, and the liquid level of the outer tank 1 is increased until reaching the balance state, at this time, one pulse and balance cycle is completed, the discharge pipe 3 is opened, the discharge valve is arranged for discharging liquid, and the next pulse and balance cycle are entered.

Claims

1. A plug-flow anaerobic digestion reactor, characterized by: the anaerobic fermentation tank comprises an inner tank (2) and an outer tank (1) fixed at the upper part of the inner tank (2), wherein at least two porous partition boards (5) with a plurality of through holes are uniformly distributed in the inner tank (2) along the height direction, the porous partition boards (5) divide the inner tank (2) into treatment areas with different anaerobic microorganism concentrations, a feed pipe (7) is arranged at the lower part of the inner tank (2), the outlet of the feed pipe (7) faces upwards and is positioned in the middle part of the inner tank (2), a feed baffle (6) is arranged at the bottom of the porous partition boards (5), the feed baffle (6) is arranged at the upper part of the outlet of the feed pipe (7) and is opposite to the outlet, and a conical sink (9) with a discharge port is arranged at the bottom of the inner tank (2); the upper portion of the inner tank (2) is provided with an overflow groove (13), the top of the overflow groove (13) is communicated with the inner tank (2), a discharging pipe (3) connected to the inner tank (2) is communicated with the overflow groove (13), a discharging valve is arranged on the discharging pipe (3), the inner tank (2) with an open top stretches into the outer tank (1), the top of the outer tank (1) is provided with a methane outlet (1-2), the outlet of the outer tank (1) is connected with a pulse pipeline (12) for generating a pulse pump (10) and a balance valve (11) for generating liquid level change of the inner tank (2) and the outer tank (1), one ends of the balance valve (11) and the pulse pump (10) are connected with the pulse pipeline (12), and the other ends of the balance valve (11) and the pulse pump (10) are connected with the lower portion of the inner tank (2).

2. A plug-flow anaerobic digestion reactor according to claim 1, wherein: the inner tank (2) is internally fixed with a middle support (4), each porous partition plate (5) is fixedly connected with the middle support (4), the upper part of the middle support (4) is connected with an overflow groove (13), the bottom of the middle support (4) is connected with a feeding baffle (6), the feeding baffle (6) is connected with a cross beam or a bottom plate at the lower part of the inner tank (2) through at least two support legs (4-1), and a conical sinking groove (9) is positioned at the lower part of the cross beam or the bottom plate.

3. A plug-flow anaerobic digestion reactor according to claim 1, wherein: the center line of the outlet of the feeding pipe (7) coincides with the center line of the conical sinking groove (9).

4. A plug-flow anaerobic digestion reactor according to claim 1, wherein: the bottom of the inner tank (2) is connected to the base (8).