Anaerobic bioreactor

Zhengyuan Environmental Protection is a professional manufacturer of anaerobic bioreactors, which can be customized according to your actual situation, with direct selling prices from the manufacturer. The anaerobic digestion process of wastewater, as the main technology for stabilizing urban sewage treatment plants, can destroy cells, reduce organic matter, improve the hydrolysis rate of wastewater, reduce wastewater volume, kill pathogenic microorganisms, improve wastewater performance, and generate biogas.

Anaerobic bioreactor price: starting from 15000 yuan, specific prices still need to be consulted with customer service.

1、 Application fields of anaerobic bioreactor:

Anaerobic bioreactor is an efficient multi-stage internal circulation reactor, which is a representative type of third-generation anaerobic reactor (UASB is a representative type of second-generation anaerobic reactor). Compared with second-generation anaerobic reactors, it has less land occupation, higher organic load, stronger shock resistance, more stable performance, and simpler operation and management. High concentration organic wastewater with COD ranging from 10000-15000mg/1; The second generation UASB reactor generally has a volumetric load of 5-8kgCOD/m3; The volumetric load rate of the third-generation A anaerobic bioreactor can reach 15-30kg COD/m3. Anaerobic bioreactors are suitable for organic high concentration wastewater, such as corn starch wastewater, citric acid wastewater, beer wastewater, potato processing wastewater, and alcohol wastewater.

2、 Summary of anaerobic bioreactor product models:

1. UASB - Upflow Anaerobic Sludge Bed Reactor

UASB stands for Up flow AnaerobicSludgeBed/Blanket. The upflow anaerobic sludge bed reactor is an anaerobic biological method for treating wastewater, also known as an upflow anaerobic sludge bed. Invented by Professor Lettinga from the Netherlands in 1977 (Dingsi year).

UASB consists of three parts: sludge reaction zone, gas-liquid solid three-phase separator (including sedimentation zone), and gas chamber. There is a large amount of anaerobic sludge stored in the bottom reaction zone, and sludge with good sedimentation and coagulation properties forms a sludge layer in the lower part. The sewage to be treated flows from the bottom of the anaerobic sludge bed and mixes with the sludge in the sludge layer. The microorganisms in the sludge decompose the organic matter in the sewage and convert it into biogas.

Biogas is continuously released in the form of tiny bubbles, which merge and gradually form larger bubbles during their ascent. In the upper part of the sludge bed, due to the agitation of biogas, a sludge with a relatively thin concentration rises together with water and enters the three-phase separator. When biogas encounters the reflection plate at the lower part of the separator, it bends around the reflection plate and then enters the gas chamber through the water layer. It is concentrated in the gas chamber and discharged through a conduit. The solid-liquid mixture is reflected and enters the sedimentation zone of the three-phase separator. The sludge in the sewage undergoes flocculation, and the particles gradually increase and settle under the action of gravity.

The sludge settled on the inclined wall slides back into the anaerobic reaction zone along the inclined wall, causing a large amount of sludge to accumulate in the reaction zone. The treated effluent separated from the sludge overflows from the upper part of the sedimentation area overflow weir and is then discharged from the sludge bed.

2. EGSB - Anaerobic Granular Sludge Expansion Bed Reactor

EGSB(ExpandedGranularSludgeBlanketReactor)， The Chinese name for the expanded granular sludge bed is the third-generation anaerobic reactor, which was first developed by Lettinga et al. from Wageingen Agricultural University in the Netherlands in the early 1990s.

Its structure is similar to that of a UASB reactor and can be divided into an inlet water distribution system, a reaction zone, a three-phase separation zone, and an outlet channel system. The difference between EGSB reactor and UASB reactor is that EGSB reactor is equipped with a dedicated effluent reflux system. EGSB reactors are generally cylindrical tower shaped, characterized by a large aspect ratio, usually up to 3-5, and the height of the production plant reactor can reach 15-20 meters. The expanded bed of granular sludge improves the contact between organic matter and microorganisms in wastewater, enhances mass transfer efficiency, and increases the biochemical reaction rate of the reactor, thereby greatly improving the treatment efficiency of the reactor.

The anaerobic reactor is composed of a sludge zone at the bottom and a three-phase separation zone for gas, liquid, and solid in the middle and upper parts. Through reflux and structural design, the wastewater has a high upward flow velocity in the reaction zone, and the granular sludge inside the reactor is in an expanded state.

3. CSTR - fully mixed anaerobic reactor (also known as continuous flow mixed stirred reactor)

Continuous stirred tank reactor (CSTR), also known as continuous stirred tank reactor, is an anaerobic treatment technology that allows fermentation materials and microorganisms to be completely mixed.

The process of fermenting liquid and producing biogas in a closed tank. The digester is equipped with a stirring device to ensure complete mixing of fermentation materials and microorganisms. The feeding method adopts constant temperature continuous feeding or semi continuous feeding operation. The newly introduced raw materials are quickly mixed with all the fermentation liquid bacteria in the fermenter due to the stirring effect, keeping the concentration of fermentation substrates relatively low to degrade organic pollutants in the wastewater and remove suspended solids in the anaerobic wastewater biological processor.

4. IC - Internal circulation anaerobic reactor

The IC tower is composed of two layers of UASB reactors connected in series, with a gas solid liquid three-phase separator installed at the top of each anaerobic reactor layer. It consists of two reaction chambers, one above and one below. Wastewater flows from bottom to top in the reactor, pollutants are adsorbed and degraded by bacteria, and purified water flows out from the upper part of the reactor.

The IC tower is powered by the biogas generated by the first UASB reactor below, which creates a density difference between the mixed liquid in the riser and reflux pipes, achieving internal circulation of the lower mixed liquid and enhancing the pre-treatment of wastewater. The second UASB above performs post-treatment (or precision treatment) on wastewater to meet the expected treatment requirements. The anaerobic reactor is composed of a sludge zone at the bottom and a three-phase separation zone for gas, liquid, and solid in the middle and upper parts. Through reflux and structural design, the wastewater has a high upward flow velocity in the reaction zone, and the granular sludge inside the reactor is in an expanded state.

5. ABR - Anaerobic Baffle Reactor

The anaerobic baffle reactor (ABR) for anaerobicba is a new and efficient anaerobic biological treatment device developed and researched by McCarty and Bachmann et al. in 1982, based on the summary of the process performance of second-generation anaerobic reactors. Its characteristics are: the reactor is equipped with a vertical guide plate, which divides the reactor into several series connected reaction chambers. Each reaction chamber is a relatively independent upflow sludge bed system, in which the sludge exists in granular or flocculent form.

The water flow is guided by a guide plate to bend up and down and move forward, passing through the sludge bed layer in the reaction chamber one by one. The substrate in the influent is fully contacted with microorganisms and can be degraded and removed. When wastewater passes through ABR, it needs to flow from bottom to top and come into contact with sludge multiple times during the flow process, greatly improving the capacity utilization of the reactor and eliminating the need for a three-phase separator.

6. Two phase anaerobic reactor

The two-phase anaerobic digestion system is a new anaerobic biological treatment process developed by Ghosh and Pohland in the early 1970s in the United States, and was first applied in production in Belgium in 1977. The two-phase anaerobic digestion process involves two stages of acidification and methanogenesis, which are carried out separately in two connected reactors. This allows acid producing bacteria and methane producing bacteria to grow under optimal environmental conditions, which not only maximizes their respective activities but also improves treatment efficiency, achieving the goal of increasing volumetric load rate, reducing reactor volume, and increasing operational stability.

In traditional applications, the balance between acid producing bacteria and methane producing bacteria in a single reactor is fragile. This is due to significant differences in physiology, nutritional requirements, growth rate, and sensitivity to the surrounding environment between the two microorganisms. The stability and control issues encountered in traditional design applications force researchers to seek new solutions.

From a biochemical perspective, the acid producing phase mainly includes hydrolysis, acid production, hydrogen production, and acetic acid production stages, while the methane producing phase mainly undergoes methane production stage. From a microbiological perspective, the acid producing phase generally only contains acid producing fermentation bacteria, while the methane producing phase not only contains methane producing bacteria, but also acid producing fermentation bacteria to varying degrees. In general, the methane production stage is the controlling stage of the entire anaerobic digestion process. In order to ensure the complete anaerobic digestion process, it is necessary to first meet the growth conditions of methane producing bacteria, such as maintaining a certain temperature and increasing reaction time, especially for difficult to degrade or toxic wastewater, which requires long-term domestication to adapt.

The two-phase anaerobic digestion process separates the acidification and methanogenesis stages in two series reactors, allowing acid producing bacteria and methane producing bacteria to grow under optimal environmental conditions. This not only facilitates the full utilization of their respective activities, but also improves treatment efficiency, achieving the goal of increasing volumetric load rate, reducing reaction volume, and increasing operational stability.

7. UBF Upflow Anaerobic Sludge Bed - Filter Reactor

Upflow Sludge Bed Filter (UBF) is a new type of composite anaerobic fluidized bed reactor developed by Canadian Guiot based on Anaerobic Filter (AF) and Upflow Anaerobic Sludge Blanket (UASB). UBF has a high biological solid retention time (SRT) and can effectively degrade toxic substances, making it an effective and economical technology for treating high concentration organic wastewater.

The composite anaerobic fluidized bed process is a reaction instrument that draws on fluidization technology to treat organisms. It uses sand and soft fillers inside the equipment as fluidized carriers. Wastewater serves as a flowing medium, and anaerobic microorganisms form biofilms on the surfaces of sand and soft fillers. When methane gas is produced in the circulation pump or wastewater treatment process, they mix on their own, making the wastewater flow. When sewage passes through the bed in an upward flow manner, it continuously contacts and reacts with the carrier attached with anaerobic biofilm in the bed, achieving the purpose of anaerobic reaction decomposition and adsorption of organic matter in sewage. The advantages of UBF composite anaerobic fluidized bed are high efficiency, small footprint, and suitability for high concentration organic wastewater treatment projects.

Its main structural features are: the lower part is an anaerobic sludge bed, which is the same as the sludge bed in the lower part of the UASB reactor, and the upper part is a packing filter layer similar to the anaerobic filter (AF). A large number of anaerobic microorganisms can be attached to the packing layer, which increases the biomass of the entire reactor, improves the processing capacity and shock resistance of the reactor.

8. AF - Anaerobic Biofilter

AF stands for Anaerobic Biofilter. This process is developed based on the traditional anaerobic activated sludge process.

The reactor consists of five parts, namely the pool bottom inlet water distribution system, the sludge layer between the pool bottom water distribution system and the filter layer, the biological filler, the pool surface outlet water replenishment system, and the biogas collection system. In AF, the retention of anaerobic sludge is achieved in two ways: firstly, bacteria form biofilms on fixed packing surfaces; The second is the formation of bacterial aggregates in the space of the reactor. Compared with traditional anaerobic biological treatment structures and other new anaerobic bioreactors, the advantages of anaerobic biofilters are: high concentration of biological solids, which can obtain higher organic loads; Microbial solids have a long residence time, which can shorten hydraulic retention time and have a high ability to withstand impact loads; The startup time is short, and it is also easier to restart after stopping the operation; The amount of residual sludge generated is extremely small, without the need for sludge reflux or residual sludge treatment facilities, with high investment and convenient operation and management; In the case of significant changes in water volume and load, its operation can maintain a high level of stability; Through practical application, it has been found that there is no need for a biogas treatment system when treating low concentration wastewater.

In AF, water enters from the bottom of the reactor and is evenly distributed through the pool bottom water distribution system. The wastewater then passes through the suspended sludge layer and biological filter layer, where organic matter comes into contact with and is fixed by microorganisms on the sludge and biofilm, and is then digested. The water is evenly discharged from the water replenishment system on the pool surface and enters the next stage processor. Anaerobic biofilters can be divided into upflow anaerobic filters and downflow anaerobic filters according to the direction of water flow. The upward flow of wastewater through the reactor is called an upflow anaerobic filter, while the reverse flow is called a downflow anaerobic filter.

9. USSB -- Upflow segmented sludge bed

USSB is the abbreviation for Upflow Staged Sludge Bed reactor. In the reactor, the reaction zone is divided into several parts, and the gas produced in each part is released after being sealed by water. The entire reactor is equivalent to a series of UASB reactor assemblies.

10. USR - Upflow Anaerobic Solid Reactor

Upflow solid anaerobic reactor (USR) is a reactor with a simple structure and suitable for high suspended solid organic materials.

The raw materials enter the digester from the bottom and come into contact with the activated sludge in the digester, allowing for rapid digestion of the raw materials. Undigested organic solid particles and biogas fermentation microorganisms are naturally settled and retained in the digester, and the supernatant overflows from the upper part of the digester. This can result in a much higher solid retention period (SRT) and microbial retention period (MRT) than hydraulic retention period, thereby improving the decomposition rate of solid organic matter and the efficiency of the digester. There are many applications in the current livestock and poultry breeding industry for the resource utilization of manure. Many large and medium-sized biogas projects adopt this process.

USR mainly processes high organic solid (organic solid matter>5%) waste liquid, which enters from the bottom water distribution system. During its ascent, the waste liquid passes through a solid bed of high concentration anaerobic microorganisms, allowing the organic solids in the waste liquid to fully contact and react with the anaerobic microorganisms. The organic solids are liquefied, fermented, and anaerobically decomposed, thereby achieving the purpose of anaerobic digestion.

11. AFEB Anaerobic Adhesive Membrane Expanded Bed

The Anaerobic Attached Membrane Expanded Bed (AAFEB) reactor is an anaerobic digestion process developed by Jewell et al. in the mid-1970s. In the AAFEB reactor, most microorganisms exist in the form of attachment to the carrier, and the nutrients in the wastewater entering the biofilm through diffusion mode are combined with anaerobic fermentation bacteria and hydrogen producing acetic acid producing bacteria to produce hydrogen gas.

AAFEB and EGSB have similar structures, but the reactor is filled with a large amount of solid particle media (particle size less than 0.5-1mm).

AAFEB has the ability to maintain high biomass and mass transfer efficiency under low HRT conditions, and operates stably. The bed of a typical anaerobic attached membrane expanded bed reactor is filled with granular activated carbon (GAC). GAC is widely regarded as a carrier with good immobilization effect on microorganisms in reactors. In the AAFEB reactor, after sludge inoculation, the biofilm is attached to the carrier due to the movement of bacteria and the vortex of wastewater. On the outside of the biofilm, filamentous bacteria begin to wrap around each other. Studies have shown that there are numerous small bacterial colonies inside the biofilm, including cocci, bacilli, and spirochetes. The particles come into contact with each other, and the expansion rate of the carrier is between 10% and 20%. Anaerobic microorganisms attach to the carrier, forming activated sludge with a biofilm structure. Moreover, the sludge has a long age, which enables the reactor to operate efficiently and stably. AAFEB has a high biological removal efficiency for wastewater containing organic compounds that inhibit biodegradation, and the domestication of microbial strains in the mud is very beneficial for the degradation of difficult to biodegrade organic compounds.

Carrier fluidization is an important feature of the AAFEB process. When the fluid flow rate in the reactor reaches a certain level and the head pressure drops beyond the weight of the carrier, the porosity between solid particles is large enough to separate the carriers from each other. The carrier is suspended by the combined effect of the fluid buoyancy of the rising water flow and the frictional force generated when hydrogen gas overflows, which is called carrier fluidization. The fluidization of sludge particles can promote the renewal of biofilm and the release of hydrogen, keeping the biofilm at an appropriate thickness and structure, which is beneficial for improving mass transfer coefficient, accelerating biochemical reactions, and reducing hydraulic retention time.

12. FPR - plug flow reactor

A plug flow reactor, also known as a push flow reactor, is a rectangular non fully mixed reactor. High concentration suspended solid fermentation materials enter from one end and exit from the other end. No need to set up a pusher, suitable for the treatment of high SS wastewater, especially for anaerobic digestion of cow manure.

13. AFBR - Anaerobic Fluidized Bed and Expanded Bed Reactor

AFBR is an efficient biofilm treatment method that uses specially developed fillers with a large specific surface area as carriers. Anaerobic microorganisms attach to the surface of the carrier in the form of biofilms and can form a granular sludge bed of a certain height in the reactor, greatly improving the degradation efficiency of organic matter.

The AFBR reactor uses particulate matter (such as sand particles) as the material for immobilizing microorganisms, and anaerobic microorganisms attach to it to form a biofilm. The packing material is in a fluidized state at a high upward flow rate, overcoming the clogging that is prone to occur in anaerobic filters (AF), and can fully mix anaerobic sludge with wastewater, improving treatment efficiency.

Wastewater is pumped continuously in pulses from the water distribution system and uniformly enters the reaction zone, where it fully contacts and reacts with the anaerobic biofilm on the carrier. At the same time, the reaction degree and contact time are increased, and the packing material reaches a fluidized state, allowing organic matter to be decomposed by anaerobic microorganisms to produce biogas. A mixture of solid, liquid, and gas phases is formed and separated in the upper part. Thus achieving the goal of wastewater treatment.

The above is an introduction to anaerobic bioreactors. We are a professional water treatment equipment company that integrates technology research and development, project design, equipment manufacturing, engineering installation, commissioning, operation, and after-sales service, with many years of technical production experience; We have a professional technical and management team that is united, pragmatic, and innovative, constantly introducing new products and high-quality services. Integrity and win-win are the eternal business philosophy of our company.