For batch reactors, conversion is a function of time whereas for. Performance of an expanded granular sludge bed egsb. Construction material should be again corrosion, stainless. The height of the reactor was 11 m, which is close to a fullscale egsb.
Egsb reactors use granulated sludge and the bed is expanded due to the high hydraulic loads applied. This was achieved by implementing a dual operational. High rate biological treatment of sulfaterich wastewater. Expanded granular sludge bed egsb reactor treating actual. The biobed duo design has been developed to provide advantages for specific applications. Schematic drawing of experimental setup with an up. The increased flux permits partial expansion fluidisation of the granular sludge bed, improving. Concept and application of anaerobic suspended granular. New designs are being drafted to increase upflow velocity and flow rates of influent, create a fluidized bed, decrease hydraulic retention time, and increase granular retention. The process efficiency depended on the operational temperature fig. Application of response surface methodology to optimize the cod removal efficiency of an egsb reactor treating poultry slaughterhouse wastewater y. Chemical reaction engineering is the synthesis of all these factors with the aim of properly designing a chemical reactor. Egsb 50 sugar 76 hybrid 33 solid waste 71 fluidized bed 21 chemicals 71 total 1229 manure codigestion 65 beverage 58 uasb. Treatment of cheese whey wastewater using an expanded.
Jan 01, 2017 the main purpose of this study is to investigate the effect of hydraulic and organic loading on the operation of egsb reactor for methane biogas production from starch wastewater. The maximal methane production in uasb, asbr, and egsb reached 1. Egsb reactor, when feeding a lowstrength volatile fatty acid vfa synthetic wastewater at a 1. Comparisons between the uasb and the egsb reactor seung j. Biobed advanced veolia water technologies north america. The reactor configurations may be cylindrical or rectangular, with fullscale reactors volumes varying from 30 to 5500 m3. Simultaneous biological removal of sulfur, nitrogen and. Uasb reactor is a methaneproducing digester, which uses an anaerobicprocess and forming a blanket of granular sludge and is processed by the anaerobic microorganisms. Recent developments include modifications that have high heighttodiameter ratios. Analysis and modeling of the hydraulic behavior of egsb reactors. The result is a tall, slender reactor for anaerobic wastewater treatment is based on the conversion of organic pollutants cod into biogas in an oxygen free atmosphere.
A new process for efficiently producing methane from waste. Anaerobic migrating blanket reactor treatment of lowstrength. The egsb reactor could however be applied with some design modi. Pdf comparisons between the uasb and the egsb reactor. Pdf cfd simulation of an expanded granular sludge bed. This settler design efficiently separates the biogas and biomass from the wastewater, thanks to the tilted tube plates that create an increased settling area for optimum biomass retention and the effective effluent collection system of submerged pipes. Materials and methods general assembly of egsb reactors. At the start up period, the reactor was operated in egsb mode with a 5 mh up flow velocity by continuous effluent recirculation. Effect of parameters on anaerobic digestion egsb reactor. Vfa concentration of influent and effluent of egsb reactor which is fed with hydrolysis products of food waste. Reactor design uses information, knowledge, and experience from a variety of areasthermodynamics, chemical kinetics, fluid mechanics, heat transfer, mass transfer, and economics. High rate biological treatment of sulfaterich wastewater in. During first one, sulphate concentration was increased in steps as shown in.
It offers improved performance by combining world leading biobed advanced technology with innovative process features such as recycle and mixing control, insitu cleaning and sludge inventory management in an advanced two layer reactor system. Design of reactor egsb anaerobic digestion sewage treatment. Pdf comparison of uasb and egsb reactors performance. Experimental methods the egsb reactor is an acrylic plexiglass column with a diameter of 300mm and height of 6000mm. Nutrient mineralization and organic matter reduction. Pdf water scarcity, an exponential increase in the worlds population and stricter environmental. With such modifications, the sludge retention time in these reactors became independent of the hydraulic retention time hrt, allowing the application of short hrts 6 h,to 1 week and correspondingly. This causes high hydraulic mixing which improves the wastewatersludge contact. The bioreactor had a sulfate conversion efficiency of 8090% at a high sulfate loading rate of 10. To evaluate the role of hydrodynamics in the design of a reactor, cfd simulations have been carried out in a range of egsb reactors with different baffle angles. A threedimensional model integrating computational fluid dynamics cfd and biokinetics was established to model an expanded granular sludge bed egsb reactor in this study. Anaerobic fluidized bed afb reactor aguaclara dashboard.
The design of most gassolids separators is proprietary with each manufacturer having its own specific configuration. Generally, in the literature, the hydrodynamic behavior of an egsb expanded granular sludge bed reactor is considered as a complete mix reactor. The design parameters of the three brewery wastewater plants are summarized in table 1. The reactor has multiple gas hoods for the separation of biogas. Pdf comparison of uasb and egsb reactors performance, for. Anaerobic migrating blanket reactor treatment of low. Anaerobic egsb expanded granular sludge bed taersa. The standard design fits round and square tanks, with heights of up to 20 meter.
Pdf mathematical modeling of the hydrodynamics of an egsb. Effect of sulphate concentration and sulphide desorption. An analysis of the flow pattern of expanded granular sludge bed egsb reactors shows that most egsb reactors do not behave as expanded bed reactors, as is widely perceived. Gas liquid solids separator glss device in the uasb reactor the main aim. Additionally, biomodtm egsb s proprietary multisettler reactor design enables uniquely high sludge retention capability, resulting in energyneutral or energypositive process conditions and lowered cost of operation, posttreatment and discharge. Hydrodynamics analysis for an upflow integrated anaerobic. Both use granular sludge, but the egsb reactor operates at high superficial velocities 71o mh, which are obtained by high recirculation rates and an elevated heightdiameter ratio. Treatment of municipal wastewater in upflow anaerobic. Egsb reactor with its patented technology and highpower reactor, the acs egsb reactor is already the first choice for many companies for efficient wastewater treatment. The biobed egsb sealed reactor design eliminates emissions of nuisance odors. An expanded granular sludge bed reactor, inoculated with acclimated sulfidogenic granular sludge, was operated at 33 c and fed with acetic acid as cod source and sulfate as electron acceptor. An expanded granular sludge bed egsb reactor is a variant of the upflow anaerobic sludge blanket digestion uasb concept for anaerobic wastewater treatment.
Performance evaluation of a new biobed advanced egsb. Reactor operation the egsb reactor was startedup in absence of sulphate, and was operated for 6 weeks prior to start feeding sulphate. The pilot consisted of a 7 m3 biobed egsb reactor and a conditioning tank figure 1. This is a single layer high load system, with only one settler layer. Both reactors were operated at a thermophilic condition 55 c with an internal recirculation flow rate of 18 mlh.
Ratio of ammonium and tkn of influent and effluent of egsb reactor which is fed with hydrolysis products of food waste 29 table 4. Microbial community structure and dynamics in anaerobic. However, a staged reactor structure resulted in amoree cientreactor, which indicates that there is a need for the optimization of egsb reactor structure. This limits the costs substantially, both capital and maintenance. The biobed advanced settler can handle higher liquid and gas upflow velocities, and thus reduces the required settler area in the reactor. Characteristics of granular sludge in an egsb reactor for. Pilot and settler design a biobed advanced pilot plant system was designed to simulate, as precisely as possible, the conditions in a full scale system. The egsb consisted of a cylindricalshaped vessel with a total working volume of 1. Expanded bed sludge blanket reactor the egsb reactor 17,18 fig. The results of this study provide comparative, quantitative and qualitative insights into denitrification desulfurization that provide a reference for better reactor design and intermediate product control. The model provided satisfactory modeling results regarding hydrodynamics and biokinetics. Up flow anaerobic sludge blanket technology also known as uasb reactor is a form of anaerobic digester which used in wastewater treatment. Second generation uasb reactors, the egsb expended granule sludge blanket reactor.
The height of the reactor was 11 m, which is close to a fullscale egsb system. Pdf anaerobic reactor design concepts for the treatment of. The distinguishing feature is that a faster rate of upwardflow velocity is designed for the wastewater passing through the sludge bed. Egsb reactor of hydrolysis products of bakers yeast wastewater 28 table 4. Biogas is collected at the top of the reactor, which acts as a biogas holder, and is piped to a biogas treatment stage. A similar but variant technology to uasb is the expanded granular sludge bed egsb digester. The anaerobic treatment of low strength wastewaters in. The starch fermented more than 95% when acidogenic sludge was prevalent in the reactor. Pdf design and evaluation of egsb bioreactors for the treatment. Egsb reactor, anaerobic treatment, granular sludge, growth yield, lowstrength. Pdf understanding how a bioreactor functions is a necessary precursor for successful reactor design and operation. May 20, 2017 the expanded granular sludge bed egsb team was created to work within the wastewater subteam to design and run new anaerobic reactors.
Analysis and modeling of the hydraulic behavior of egsb. A labscale expanded granular sludge bed egsb reactor was operated at 20c with low strength. V liquid reactor mh reactor mh egsb comparison between the main characteristics parameters of biothane uasbuasb and biobedbiobed. This condition intensifies the hydraulic mixture inside the reactor increasing contact between biomass and substrate. The egsb reactor was also developed to give more chances to contact between wastewater and granules. Wastewater, anaerobic treatment, modelling, uasb reactor. Design and evaluation of egsb bioreactors for the treatment of. The optimal structural design in this work was in that electrodes were placed at the bottom of the reactor with the cathode placed above the anode. Average methane data for egsb reactor which is fed with hydrolysis.
Overview of the application of anaerobic treatment to. Upflow anaerobic sludge blanket digestion wikipedia. Application of response surface methodology to optimize the. Egsb reactors derive from uasb, with the exception of the type of sludge and the blanket expansion inside of it. The reactor performance, microbial distribution, and microbial activity were considered. The egsb reactor is a modification of the traditional uasb technology. In this paper, anaerobic reactors are evaluated considering the historical evolution and types of wastewaters. During first one, sulphate concentration was increased in steps as shown in table 1. Since the earlier anaerobic treatment systems, the design concepts were improved from classic reactors like septic tanks and anaerobic ponds, to modern high rate reactor configurations like anaerobic filters, uasb, egsb, fixed film fluidized bed and expanded bed reactors, and others.
Performance of an expanded granular sludge bed egsb reactor. Upflow anaerobic sludge blanket uasb technology, normally referred to as uasb reactor, is a form of anaerobic digester that is used for wastewater treatment the uasb reactor is a methanogenic methaneproducing digester that evolved from the anaerobic clarigester. An expanded granular sludge bed egsb reactor and an anaerobic filter af, inoculated with granular. The studies confirmed that in practice do does not constitute any detrimental effect on the reactor treatment performance.
However, egsb reactors are less used than uasb reactors for the treatment of domestic. Econvert egsb expanded granular sludge bed is an optimized compromise. Uasb reactor is based on the socalled threephase separator, which enables the reactor to separate gas, water and sludge mixtures under high turbulence conditions. Characteristics of granular sludge in an egsb reactor for treating. The unique settling system of the reactor has proven to retain solids also in high flow. Intermittent effluent recirculation for the efficient.
Under controlled conditions it can be burned in a biogas flare or alternatively serves as a source of energy for the production site. Pdf anaerobic reactor design concepts for the treatment. The biobed egsb process is based on a hightech and proven process design. Mathematical modeling of the hydrodynamics of an egsb reactor. Research article threedimensional modeling of hydrodynamics.
The crucial difference to other providers is years of research and experience, which has not only simplified the technology but also increased the efficiency and performance of. The egsb reactor was seeded with a mixture of activated sludge taken from bed mud from a domestic wastewater discharge channel and sludge from an acidogenic reactor working as part of the wastewater treatment facilities in a local pharmaceutical factory harbin, china. Separation between the biogas, sludge and wastewater, 2. Reactor performance and microbial community of an egsb. Oct 01, 2017 in this study, we have performed a twodimensional model of a threephase flow wastewater, biogas and sludge in the overall zone of egsb reactors using cfd. The height and inside diameter of pvc cylinder column are cm and 10. Design characteristics of biobed egsb plants at unicer, cesu alus and anheuser busch flow cod load process type reactor volume m3d kgd 3 m unicer 6000 19,800 biobed egsb 20 cesu alus 600 3,600 biobed mp 4 x 50. Influence of microbial spatial distribution and activity. Comparisons between the uasb and the egsb reactor seung. Effect of sulphate concentration and sulphide desorption on. One design may have low reactor cost, but the materials leaving the unit may be such that their treatment requires a much higher cost than alternative designs. Then, the use of fermentation liquid of ph 10 pretreated sludge to produce methane in the reactors of upflow anaerobic sludge bed uasb, anaerobic sequencing batch reactor asbr and egsb was compared. These researchers found also that staging was bene.
For this purpose, the stimulusresponse test was used, as well as the construction of a mathematical model that fits and describes the hydraulic performance of each reactor. Operation of an anaerobic filter and an egsb reactor for the. Pdf generally, in the literature, the hydrodynamic behavior of an egsb expanded granular sludge bed reactor is considered as a complete. Rather, these reactors behave as fluidized bed reactors based on the classic chemical reactor theory. It had an obvious hydrodynamics advantage and generated maximum methane production of 304. Cfd optimization of the baffle angle of an expanded granular. Nov 16, 20 bed expansion serves an important function in the design and operation of an upflow anaerobic reactor. In searching for the optimum it is not just the cost of the reactor that must be minimized.
Pdf cfd simulation of an expanded granular sludge bed egsb. Chemical reaction engineering is the synthesis of all these factors with the aim of. Prevent the washout of floating sludge design considerations. Performance evaluation of a new biobed advanced egsb settler. With granules, this reactor is able to treat various highstrength industrial wastewaters and most soluble wastewater could be applied in this reactor. The compact design requires less construction material and results in a roughly one meter lower reactor height.
Over time, the uasb model has been upgraded, pain points have been addressed, and design has been optimized ultimately resulting in the following types of systems. A schematic diagram of an egsb reactor is shown in fig. Further development and design of ad systems resulted in systems such as the expanded granular sludge bed reactor egsb, a modified form of uasb, demonstrating the capability of propagated sludge granules to increase contact effectively between the wastewater and anaerobic granules avula et al. The purpose of the egsb reactor was to effectively reduce the organic load of the feed subsequent to the effluent being treated in the anoxic and aerobic bioreactors. In egsb reactors, efficiencies were above 80% at olrs up to 12 g codl. Few works study in detail the flow of such reactors. Threedimensional modeling of hydrodynamics and biokinetics. Design of the reactor is no routine matter, and many alternatives can be proposed for a process. Vertical slim columns are applied as structures of egsb reactors. The egsb reactor treating synthesized municipal wastewater was operated at ambient temperature.
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