AU2017416198A1 - Jet flow anaerobic bioreactor for treating high-concentration organic wastewater - Google Patents

Jet flow anaerobic bioreactor for treating high-concentration organic wastewater Download PDF

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AU2017416198A1
AU2017416198A1 AU2017416198A AU2017416198A AU2017416198A1 AU 2017416198 A1 AU2017416198 A1 AU 2017416198A1 AU 2017416198 A AU2017416198 A AU 2017416198A AU 2017416198 A AU2017416198 A AU 2017416198A AU 2017416198 A1 AU2017416198 A1 AU 2017416198A1
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main body
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Chaohai WEI
Chaofei WU
Haizhen WU
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South China University of Technology SCUT
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C02F3/2833—Anaerobic digestion processes using fluidized bed reactors
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C02F3/2866—Particular arrangements for anaerobic reactors
    • C02F3/2893—Particular arrangements for anaerobic reactors with biogas recycling
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

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  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Sustainable Development (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

A jet anaerobic bioreactor for treating a high-concentration organic sewage, comprising a reactor main body zone (1), and a gas purification zone (2) and a separation sedimentation zone (3) provided on two sides thereof. The reactor main body zone (1) is connected to an outlet end of an ejector (5) via an injection pipe (4), the water inlet end of the ejector (5) is connected to the separation sedimentation zone (3) via a circulating water pipe (6), and the gas inlet end of the ejector (5) is connected to the gas purification zone (2) via a biogas pipe (7). A mixed liquid connection hole (8) in communication with the separation sedimentation zone (3) is provided in the middle part of the reactor main body zone (1), and a sludge return hole (9) in communication with the bottom of the reactor main body zone (1) is provided at the bottom of the separation sedimentation zone (3). The reactor realizes complete and uniform mixing of the sewage and sludge and fluidization in the reactor by means of a biogas anaerobic jet produced by the reactor itself, and is suitable for the treatment of high-concentration organic sewage having poor biochemical properties as the biogas is in a closed loop state and the fluidization effect is less affected by the biogas production.

Description

Technical Field
The present invention relates to the technical field of the treatment of wastewater, and in particular to a jet flow anaerobic bioreactor for treating high-concentration organic wastewater.
Background Art
Essentially a process for the anaerobic treatment of wastewater is an economic and effective treatment technology which utilizes the metabolic characteristics of anaerobic microorganisms to reduce organic matters in the wastewater and simultaneously generate biogas such as methane. With the rapid development of economy and as environmental pollution and energy shortage concerns become increasingly prominent, anaerobic treatment processes, as low-energy consumption methods for biologically treating organic wastewater, have received widespread attention and extensive promotion. The anaerobic treatment technology is no longer just a complement to aerobic treatment processes, but itself is also becoming a valuable alternative to the aerobic processes. The anaerobic biological treatment technology can be developed as a core technology of a comprehensive system that combines environmental protection and energy recovery with virtuous ecological cycle, and has good environmental and economic benefits. In the course of the development of anaerobic biological treatment processes, the development of anaerobic treatment reactors has always been a research hotspot in the field of water treatment. Three generations of anaerobic reactors have developed so far. The first generation of anaerobic reactor is an anaerobic digestion tank, which is mainly used for digesting sludge and excrements; the second generation of anaerobic reactor mainly includes an anaerobic filter (AF), an anaerobic fluidized bed (AFB) reactor and an upflow anaerobic sludge blanket (UASB); and the third generation of anaerobic reactor is designed for solving the problems of shortcut flow, dead zones, blockage, etc. occurring during the operation of the second generation reactor, and mainly includes an anaerobic expanded granular sludge bed (EGSB), an anaerobic internal circulation reactor (IC), an anaerobic baffled reactor (ABR), etc. However, the above reactors all have the problems of an uneven sludge distribution and poor mixing and mass transfer during use; in particular, when dealing with wastewater with poor biodegradability or containing substances inhibiting the anaerobic process, the yield of methane may be significantly reduced, thereby greatly affecting the initial starting, mass transfer and mixing of the reactors, and also resulting in low removal rates of COD and BOD5.
Summary of the Invention
The object of the present invention is to provide a jet flow anaerobic biorcactor for treating high-concentration organic wastewater in order to overcome the defects of the prior art. By means of gas lifting, the uniform mixing of wastewater and sludge and the stripping of soluble gases, particularly methane are simultaneously realized; furthermore, due to realizing a density flow of sludge particles in the fluid and the treated wastewater, the reactor avoids the defect of poor sludge separation in traditional fluidized bed reactors, thereby realizing high-efficiency three-phase separation.
The technical solution of the present invention is as follows: A jet flow anaerobic bioreactor for treating high-concentration organic wastewater, wherein a reactor main body zone, a gas purification zone and a separation and sedimentation zone are provided in the reactor, wherein the gas purification zone and the separation and sedimentation zone are respectively arranged on two sides of the reactor main body zone; the inside of the reactor main body zone is connected to an outlet of an ejector via a jet pipeline, a water inlet of the ejector is connected to the separation and sedimentation zone via a circulating water pipeline, and a gas inlet of the ejector is connected to the gas purification zone via a biogas pipeline; and the middle portion of the reactor main body zone is provided with a mixed liquid connection hole connecting the separation and sedimentation zone, and the bottom of the separation and sedimentation zone is provided with a sludge return hole connecting the bottom of the reactor main body zone.
The reactor main body zone has a sleeve structure (that is, the reactor main body zone is composed of 2 sleeved tubes), and the gas purification zone and the separation and sedimentation zone are both box-type structures arranged on an outer side of the reactor main body zone.
A riser zone and a downcomer zone are provided in the reactor main body zone, wherein the riser zone is located in the center of the reactor main body zone, the downcomer zone is located on the periphery of the reactor main body zone, the upper portion of the riser zone is in communication with the upper portion of the downcomer zone, the bottom of the riser zone is connected with the bottom of the downcomer zone, the jet pipeline is located in the riser zone, and the bottom end of the jet pipeline is located at the bottom of the riser zone.
The main structure of the reactor main body zone comprises an outer pipe and an inner pipe which are coaxially arranged, wherein the inner pipe is arranged in the center of the outer pipe, the upper and lower ends of the inner pipe are both open, a mixed liquid downward flowing space is provided between the lower end of the inner pipe and the bottom surface of the outer pipe, and a mixed liquid upward flowing space is provided between the upper end of the inner pipe and the top surface of the outer pipe; and the interior region of the inner pipe forms the riser zone and an annular region between the exterior of the inner pipe and the outer pipe forms the downcomer zone. The mixed liquid in the riser zone flows upward, the mixed liquid in the downcomer zone flows downward, and the mixed liquid upward flowing space and the mixed liquid downward flowing space realize exchanged flow direction of the mixed liquid.
The outer pipe and the inner pipe are both square pipes or round pipes. When the outer pipe and the inner pipe are both square pipes, the gas purification zone and the separation and sedimentation zone are both rectangular box-type structures arranged on two sides of the outer pipe, and the downcomer zone is also correspondingly a rectangular annular zone; and when the outer pipe and the inner pipe are both round pipes, the gas purification zone and the separation and sedimentation zone are respectively semi-annular box-type structures arranged on the periphery of the outer pipe, and the downcomer zone is also correspondingly a round annular zone.
The main structure of the gas purification zone comprises an alkaline solution multi-orifice sprayer, a porous filler, a gas release pipe and an alkaline solution storage tank, which are arranged in sequence from top to bottom, wherein an alkaline solution sprayed out of the alkaline solution multi-orifice sprayer flows counter-currently against a biogas released from the gas release pipe to realize a counter-current contact, and performs gas purification in the porous filler to remove acidic components such as hydrogen sulfide from the gas, and a purified biogas is delivered to the ejector via a biogas pipeline.
A gas storage zone is further provided inside the reactor main body zone, wherein the gas storage zone is located above the riser zone and the downcomer zone, and the gas storage zone is connected with the upper portion of the gas purification zone; and a perforated gas absorption pipe is further provided inside the gas storage zone, and the perforated gas intake pipe is connected to the gas release pipe via a getter pump. The gas is forcibly sucked by the getter pump and released at the bottom of the gas purification zone, which comes into counter-current contact with the alkaline solution sprayed from the top, the filler sprayed with water results in a significant increase in contact area, thereby enhancing the absorption of harmful acidic gases such as hydrogen sulfide from the biogas. The purified gas is brought to the top of the reactor main body zone again driven by the circulation flow, and then enters the ejector via the biogas pipeline and participates in biogas jet flow circulation.
The alkaline solution storage tank is connected to the alkaline solution multi-orifice sprayer via an alkaline solution circulating pump, and the alkaline solution in the alkaline solution storage tank is sucked by the alkaline solution circulating pump and conveyed to the alkaline solution multi-orifice sprayer for spraying, thereby realizing recycling of the alkaline solution and achieving the purpose of saving resources.
The separation and sedimentation zone comprises a lower sludge zone, a middle buffer zone, an upper inclined plate sedimentation zone and an effluent trough, which are arranged in sequence from bottom to top, wherein the lower sludge zone is connected with the bottom of the reactor main body zone via the sludge return hole, the middle buffer zone is connected with the middle portion of the reactor main body zone via the mixed liquid connecting hole, an outer side wall of the middle buffer zone is provided with a mixed liquid outlet, the mixed liquid outlet is connected to the ejector via a mixed liquid circulating pump, and the effluent trough is externally connected to an effluent storage tank. A certain proportion of mixed liquid flows into the middle buffer zone from the reactor main body zone via the mixed liquid outlet. After buffering and sedimentation, the sludge is intercepted in the lower sludge zone, while the mixed liquid changes its direction and moves upward, and further undergoes sludge-liquid separation in the upper inclined plate sedimentation zone. The effluent is discharged via the effluent trough and brought to a subsequent procedure for treatment, while the sludge is appropriately concentrated at the bottom of the lower sedimentation zone and then slides down along the wall into the main reaction zone again, thereby realizing automatic return of sludge without a secondary sedimentation tank. A mixed liquid return pump suctions the mixed liquid below an inclined plate in the separation and sedimentation zone for circulation, whereby the surface load of the inclined plate sedimentation zone can be effectively reduced, and the sludge-liquid separation is realized in a better way.
The biogas pipeline is provided with a gas flowmeter, which can detect the pressure in the reactor main body zone and the gas purification zone in real time. A pressure gauge and a water sealing bottle are provided at the top of the reactor main body zone. By means of the water sealing bottle, the pressure is kept stable, and when the pressure exceeds the equilibrium pressure of the water sealing bottle, excess gas can be automatically released to reduce the pressure. The bottom of the reactor main body zone is provided with a water inlet pipe, which is used for evenly distributing the introduced high-concentration organic wastewater.
The principle of the above-mentioned jet flow anaerobic bioreactor is as follows: the jet flow anaerobic bioreactor allows the biogas generated in the anaerobic bioreactor to return to the bottom of the reactor together with the returned liquid by means of jet flow, such that the driving force for fluidization of the reactor is changed from single liquid flow to gas flow turbulence coupled with liquid flow. The fluidization effect and the mass transfer performance of the reactor are greatly improved, while the liquid return ratio is reduced; therefore, the novel jet flow anaerobic biological fluidized bed reactor is developed for treating high-concentration organic wastewater. Gas resulting from anaerobic fermentation drives the liquid inside the reactor to flow in a circular manner, so that the problems of poor fluidization and sludge separation of traditional fluidized beds are solved, efficient three-phase separation is realized, and the anaerobic sludge concentration in the reactor is greatly improved without a secondary sedimentation tank; by running a low C/N and low-concentration anaerobic process and carrying out a high-efficiency low-concentration anaerobic ammonia oxidation process in the anaerobic fluidized bed, after the high-concentration wastewater is anaerobically treated, about 90% of COD and ammonia nitrogen can be removed, and the aerobic load is reduced, so that the aerobic effluent may fully meet standards and be discharged.
With respect to the prior art, the present invention has the following beneficial effects:
The present jet flow anaerobic bioreactor realizes fluidization in the reactor and complete and uniform mixing of water phase and sludge by means of an anaerobic mixed liquid jet flow along with biogas generated by the reactor itself, and since the biogas is in a closed circulation, the impact of the yield of the biogas on the fluidization effect is minimized, and the jet flow anaerobic bioreactor can be used for treating high-concentration organic wastewater with poor biodegradability.
The jet flow anaerobic biorcactor produces a jet flow by mixing the biogas generated during the anaerobic reaction process with the returned flow of the effluent from the top of the separation zone, so that the mass transfer performance is enhanced, the energy consumption is reduced, the liquid flow rate can be controlled β at 10-30 m /h, and blockage hardly occurs.
The jet flow anaerobic biorcactor drives the fluidization by utilizing the biogas generated during the anaerobic reaction process, and due to partial separation of toxic gas, dynamics of the reaction can be promoted thereby realizing purification of the separated gas and improvement of the yield.
The jet flow anaerobic bioreactor realizes complete fluidization of the gas phase and liquid phase in the reactor by changing the fluid characteristics. It is proved by experiments that for food wastewater and papermaking wastewater, a comprehensive effect of stable operation, gas production and COD removal can be β
achieved under a load of 6 kg C0D/(m -d), and the comparison of the operation performance thereof with respect to that of the upflow anaerobic sludge blanket (UASB) can be seen in Table 1.
Table 1 Comparison of experimental statistics of jet flow anaerobic bioreactor and UASB reactor
Processing unit Inlet water (mg/L) Removal rate (%)
CODCr bod5 nh4 +-n ss CODCr bod5 nh4 +-n SS
UASB reactor (A) 16650-17830 9820-11230 1570-1690 3550-4650 70.3 ± 3.8 73.4 ± 3.2 16.3 ± 5.6 82.2 ± 2.2
UASB reactor (B) 8370-8840 3360-4590 312-508 6300-8500 56.3 ± 4.8 60.3 ± 3.8 10.3 ± 1.8 70.3 ± 5.8
Jet flow anaerobic bio reactor 16830-18540 9406-11050 1336-1640 3455-4690 90.8 ± 3.7 95.0 ± 1.7 43.6 ± 4.4 89.5 ± 5.5
(A)
Jet flow anaerobic bio reactor 8431-8910 3874-4840 392-440 5860-8850 75.3±6.8 78.9±3.6 35.0±1.9 92.2±2.4
(B)
A: Food wastewater; B: Papermaking wastewater.
Brief Description of the Drawings
Figure 1 is a structural schematic view of the present jet flow anaerobic bioreactor.
Figure 2 is a structural schematic view of an improved version of the present jet flow anaerobic bioreactor.
Detailed Description of Embodiments
The present invention will be further described below in detail in conjunction with examples, but the implementations of the present invention are not limited thereto.
Example 1
Example 1 is a jet flow anaerobic bioreactor for treating high-concentration organic wastewater, wherein as shown in figure 1, a reactor main body zone 1, a gas purification zone 2 and a separation and sedimentation zone 3 are provided in the reactor, wherein the gas purification zone and the separation and sedimentation zone are respectively arranged on two sides of the reactor main body zone; the inside of the reactor main body zone is connected to an outlet of an ejector 5 via a jet pipeline 4, a water inlet of the ejector is connected to the separation and sedimentation zone via a circulating water pipeline 6, and a gas inlet of the ejector is connected to the gas purification zone via a biogas pipeline 7; and the middle portion of the reactor main body zone is provided with a mixed liquid connection hole 8 connecting the separation and sedimentation zone, and the bottom of the separation and sedimentation zone is provided with a sludge return hole 9 connecting the bottom of the reactor main body zone.
A riser zone 1-1 and a downcomer zone 1 -2 are provided in the reactor main body zone, wherein the riser zone is located in the center of the reactor main body zone, the downcomer zone is located on the periphery of the reactor main body zone, the upper portion of the riser zone is in connected with the upper portion of the downcomer zone, the bottom of the riser zone is connected with the bottom of the downcomer zone, the jet pipeline is arranged in the riser zone, and the bottom end of the jet pipeline is located at the bottom of the riser zone.
The reactor main body zone has a sleeve structure (that is, the reactor main body zone is composed of 2 sleeved tubes), and the gas purification zone and the separation and sedimentation zone are both box type structures arranged on an outer side of the reactor main body zone. The main structure of the reactor main body zone comprises an outer pipe and an inner pipe which are coaxially arranged, wherein the inner pipe is arranged in the center of the outer pipe, the upper and lower ends of the inner pipe are both open, a mixed liquid downward flowing space
1-4 is kept between the lower end of the inner pipe and the bottom surface of the outer pipe, and a mixed liquid upward flowing space 1-3 is kept between the upper end of the inner pipe and the top surface of the outer pipe; and the interior region of the inner pipe forms the riser zone and an annular region between the exterior of the inner pipe and the outer pipe forms the downcomer zone. The mixed liquid in the riser zone flows upward, the mixed liquid in the downcomer zone flows downward, and the mixed liquid upward flowing space and the mixed liquid downward flowing space realize exchanged flow direction and circulatory movement of the mixed liquid. The outer pipe and the inner pipe are both square pipes, the gas purification zone and the separation and sedimentation zone are both in rectangular box-type structures arranged on two sides of the outer pipe, and the downcomer zone is also correspondingly a rectangular annular zone.
The main structure of the gas purification zone comprises an alkaline solution multi-orifice sprayer 10, a porous filler 11, a gas release pipe 12 and an alkaline solution storage tank 13, which are arranged in sequence from top to bottom, wherein an alkaline solution sprayed out of the alkaline solution multi-orifice sprayer flows counter-currently against a biogas released from the gas release pipe and performs gas purification in the porous filler, and a purified biogas is delivered to the ejector via the biogas pipeline. A gas storage zone 1-5 is further provided inside the reactor main body zone, wherein the gas storage zone is located above the riser zone and the downcomer zone, and is connected with the upper portion of the gas purification zone; and a perforated gas intake pipe 14 is further provided inside the gas storage zone, and the perforated gas absorption pipe is connected to the gas release pipe via a getter pump 15. The gas is forcibly sucked by the getter pump and released at the bottom of the gas purification zone, which comes into counter-current contact with the alkaline solution sprayed from the top. The filler sprayed with water results in a significant increase in contact area, thereby enhancing the absorption of harmful gases such as hydrogen sulfide from the biogas. The purified gas is brought to the top of the reactor main body zone again driven by a circulation flow, and then enters the ejector via the biogas pipeline and participates in biogas jet flow circulation. The alkaline solution storage tank is connected to the alkaline solution multi-orifice sprayer via an alkaline solution circulating pump 16, and the alkaline solution in the alkaline solution storage tank is sucked and conveyed to the alkaline solution multi-orifice sprayer by means of the alkaline solution circulating pump for spraying, thereby realizing recycling of the alkaline solution, thus achieving the purpose of saving resources.
The separation and sedimentation zone comprises a lower sludge zone 3-1, a middle buffer zone 3-2, an upper inclined plate sedimentation zone 3-3 and an effluent trough 3-4, which are arranged in sequence from bottom to top, wherein the lower sludge zone is connected with the bottom of the reactor main body zone via the sludge return hole, the middle buffer zone is connected with the middle portion of the reactor main body zone via the mixed liquid connecting hole 8, an outer side wall of the middle buffer zone is provided with a mixed liquid outlet 17, the mixed liquid outlet is connected to the ejector via a mixed liquid circulating pump 21, and the effluent is discharged to the outside via the trough and is brought to a subsequent procedure for treatment. A certain proportion of mixed liquid flows into the middle buffer zone from the reactor main body zone via the mixed liquid outlet. After buffering and sedimentation, the sludge is intercepted in the lower sludge zone, while the mixed liquid changes its direction and moves upward, and further undergoes sludge-liquid separation in the upper inclined plate sedimentation zone. The effluent is discharged via the effluent trough and brought to a subsequent procedure for treatment, while the sludge is appropriately concentrated at the bottom of the lower sedimentation zone and then slides down along the wall into the main reaction zone again, thereby realizing automatic return of sludge without a secondary sedimentation tank. A mixed liquid return pump suctions the mixed liquid below an inclined plate in the separation and sedimentation zone for circulation, whereby the surface load of the inclined plate sedimentation zone can be effectively reduced, and the sludge-liquid separation is realized in a better way.
In addition, the biogas pipeline is provided with a gas flowmeter 18, which can detect the pressure in the reactor main body zone and the gas purification zone in real time. A pressure gauge 19 and a water sealing bottle 20 are provided at the top of the reactor main body zone. By means of the water sealing bottle, the pressure is kept stable, and when the pressure exceeds the equilibrium pressure of the water sealing bottle, excess gas can be automatically released to reduce the pressure. The anaerobic gas is stored in a pressure container tank as a product via a collector. The bottom of the reactor main body zone is provided with a water inlet pipe 22, which is used for introducing the high-concentration organic wastewater. In addition, as shown in figure 2, in the improved version of the present jet flow anaerobic bioreactor, a No. 23 valve is newly added, which is a control valve for externally connecting the biogas to a user or to a storage tank, and is used for delivering the biogas to the user or the storage tank.
The principle of the above-mentioned jet flow anaerobic bioreactor is as follows: the jet flow anaerobic bioreactor allows the biogas generated in the anaerobic bioreactor to return to the bottom of the reactor together with the returned liquid by means of jet flow, such that the driving force for fluidization of the reactor is changed from single liquid flow to gas flow turbulence coupled with liquid flow. The fluidization effect and the mass transfer performance of the reactor are greatly improved, while the liquid return ratio is reduced; therefore, the novel jet flow anaerobic biological fluidized bed reactor is developed for treating high-concentration organic wastewater. Gas resulting from anaerobic fermentation drives the liquid inside the reactor to flow in a circular manner, so that the problems of poor fluidization and sludge separation of traditional fluidized beds are solved, efficient three-phase separation is realized, and the anaerobic sludge concentration in the reactor is greatly improved; MLSS reaches 12 g/L or more with a controllable concentration; by running a low C/N and low-concentration anaerobic process and carrying out a high-efficiency low-concentration anaerobic ammonia oxidation process in the anaerobic fluidized bed, after the high-concentration wastewater is anaerobically treated, about 90% of COD and ammonia nitrogen can be removed, and the aerobic load is reduced, so that the aerobic effluent may fully meet standards and be discharged.
The specific process thereof is indicated by arrows in figure 1. There is a part of space (i.e. gas storage zone 1-5) which is not filled with the mixed liquid at the top of the reactor main body zone, and after the reaction begins, this space is gradually filled with the biogas. The reactor main body zone suctions sludge-liquid mixture below the inclined plate of the separation and sedimentation zone for forced mixed liquid circulation. The returned mixed liquid passes through the ejector at a high speed so that a negative pressure is generated at a throat portion of the ejector. Under negative pressure the ejector suctions the gas stored at the top of the reactor main body zone into the ejector via the biogas pipeline and the flowmeter. The gas and water phases are mixed in the ejector and are then directly delivered to the bottom of the riser zone via the jet pipeline and released. The released gas-water mixture moves upward along the riser pipe. Since the gas content of the riser zone is higher than that of the downcomer zone, under the action of such a density difference, circulation of the liquid in the riser zone and the downcomer zone and uniform fluidization of the whole reactor main body zone are realized. A certain proportion of mixed liquid flows into the separation and sedimentation zone from the reactor main body zone via the mixed liquid connecting hole, and passes through the middle buffer zone and the lower sedimentation zone, in which sludge is intercepted, while the mixed liquid changes it direction and moves upward, and further undergoes sludge-liquid separation in the upper inclined plate sedimentation zone. The effluent is discharged via the effluent trough and brought to a subsequent treatment process, while the sludge is appropriately concentrated at the bottom of the lower sedimentation zone and then slides down along the wall into the main reaction zone again, thereby realizing automatic return of sludge and improved sludge concentration. The mixed liquid return pump suctions the mixed liquid below an inclined plate in the separation and sedimentation zone for circulation, whereby the surface load of the inclined plate sedimentation zone can be effectively reduced, and the sludge-liquid separation is realized in a better way. The gas in the gas storage zone at the top of the reactor is kept at a stable pressure by means of the water sealing bottle, and when the pressure exceeds the equilibrium pressure of the water sealing bottle, excess gas can be automatically released to reduce the pressure; furthermore, the change in pressure can be monitored by the pressure gauge. A perforated gas intake pipe is provided in the gas storage zone. The gas is forcibly sucked by the getter pump and released at the bottom of the gas purification zone, which comes into counter-current contact with the alkaline solution sprayed from the top. The filler sprayed with water results in a significant increase in contact area, thereby enhancing the absorption of harmful gases such as hydrogen sulfide from the biogas, and the purified gas is brought to the top of the reaction zone again driven by a circulation flow and participates in biogas jet flow circulation.
Example 2
Example 2 is a jet flow anaerobic bioreactor for treating high-concentration organic wastewater, which differs from example 1 in that the outer pipe and the inner pipe are both round pipes, the gas purification zone and the separation and 10 sedimentation zone are respectively semi-annular box-type structures arranged on the periphery of the outer pipe, and the downcomer zone is also correspondingly a round annular zone.
From the above description, the present invention can be well implemented, the above-mentioned examples are only preferred embodiments of the present 15 invention and are not intended to limit the scope of the implementation of the present invention, that is, all equivalent changes and modifications made according to the content of the present invention are covered by the scope of protection of the claims of the present invention.

Claims (10)

  1. Claims
    1. A jet flow anaerobic bioreactor for treating high-concentration organic wastewater, characterized in that a reactor main body zone, a gas purification zone and a separation and sedimentation zone are provided in the reactor, wherein the gas purification zone and the separation and sedimentation zone are respectively arranged on two sides of the reactor main body zone; the inside of the reactor main body zone is connected to an outlet of an ejector via a jet pipeline, a water inlet of the ejector is connected to the separation and sedimentation zone via a circulating water pipeline, and a gas inlet of the ejector is connected to the gas purification zone via a biogas pipeline; and the middle portion of the reactor main body zone is provided with a mixed liquid connection hole connecting the separation and sedimentation zone, and the bottom of the separation and sedimentation zone is provided with a sludge return hole connecting the bottom of the reactor main body zone.
  2. 2. The jet flow anaerobic bioreactor for treating high-concentration organic wastewater according to claim 1, characterized in that the reactor main body zone has a sleeve structure, and the gas purification zone and the separation and sedimentation zone are both box-type structures arranged on an outer side of the reactor main body zone.
  3. 3. The jet flow anaerobic bioreactor for treating high-concentration organic wastewater according to claim 1, characterized in that a riser zone and a downcomer zone are provided in the reactor main body zone, wherein the riser zone is located in the center of the reactor main body zone, the downcomer zone is located on the periphery of the reactor main body zone, the upper portion of the riser zone is connected with the upper portion of the downcomer zone, the bottom of the riser zone is connected with the bottom of the downcomer zone, the jet pipeline is located in the riser zone, and the bottom end of the jet pipeline is located at the bottom of the riser zone.
  4. 4. The jet flow anaerobic bioreactor for treating high-concentration organic wastewater according to claim 3, characterized in that the main structure of the reactor main body zone comprises an outer pipe and an inner pipe which are coaxially arranged, wherein the inner pipe is arranged in the center of the outer pipe, the upper and lower ends of the inner pipe are both open, a mixed liquid downward flowing space is provided between the lower end of the inner pipe and the bottom surface of the outer pipe, and a mixed liquid upward flowing space is provided between the upper end of the inner pipe and the top surface of the outer pipe; and the interior region of the inner pipe forms the riser zone and an annular region between the exterior of the inner pipe and the outer pipe forms the downcomer zone.
  5. 5. The jet flow anaerobic bioreactor for treating high-concentration organic wastewater according to claim 4, characterized in that the outer pipe and the inner pipe are both square pipes or round pipes.
  6. 6. The jet flow anaerobic bioreactor for treating high-concentration organic wastewater according to claim 1, characterized in that the main structure of the gas purification zone comprises an alkaline solution multi-orifice sprayer, porous fillers, a gas release pipe and an alkaline solution storage tank, which are arranged in sequence from top to bottom, wherein alkaline solution sprayed out of the alkaline solution multi-orifice sprayer flows counter-currently against a biogas released from the gas release pipe and performs gas purification in the porous fillers, and a purified biogas is delivered to the ejector via the biogas pipeline.
  7. 7. The jet flow anaerobic bioreactor for treating high-concentration organic wastewater according to claim 6, characterized in that a gas storage zone is further provided inside the reactor main body zone, wherein the gas storage zone is located above the riser zone and the downcomer zone, and the gas storage zone is connected with the upper portion of the gas purification zone; and a perforated gas absorption pipe is further provided inside the gas storage zone, and the perforated gas intake pipe is connected to the gas release pipe via a getter pump.
  8. 8. The jet flow anaerobic bioreactor for treating high-concentration organic wastewater according to claim 6, characterized in that the alkaline solution storage tank is a liquid feedstock tank connected to the alkaline solution multi-orifice sprayer via an alkaline solution circulating pump.
  9. 9. The jet flow anaerobic bioreactor for treating high-concentration organic wastewater according to claim 1, characterized in that the separation and sedimentation zone comprises a lower sludge zone, a middle buffer zone, an upper inclined plate sedimentation zone and an effluent trough, which are arranged in sequence from bottom to top, wherein the lower sludge zone is connected with the bottom of the reactor main body zone via the sludge return hole, the middle buffer zone is connected with the middle portion of the reactor main body zone via the mixed liquid connecting hole, an outer side wall of the middle buffer zone is provided with a mixed liquid outlet, the mixed liquid outlet is connected to the ejector via a mixed liquid circulating pump, and the effluent trough is externally connected to an effluent storage tank.
  10. 10. The jet flow anaerobic bioreactor for treating high-concentration organic wastewater according to claim 1, characterized in that the biogas pipeline is provided with a gas flowmeter, a pressure gauge and a water sealing bottle are provided at the top of the reactor main body zone, and a water inlet pipe is provided at the bottom of the reactor main body zone.
AU2017416198A 2017-05-27 2017-11-30 Jet flow anaerobic bioreactor for treating high-concentration organic wastewater Ceased AU2017416198B2 (en)

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