Technical review on the UASB process

Lin, K.C.; Yang, Zhenxiang

doi:10.1080/00207239108710695

Cited by 29 publications

(13 citation statements)

References 65 publications

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“…The original UASB reactors relied on the development of a dense, granular sludge (1-4 mm); however, with the proper selection of upflow velocities and efficient separation of the solids from the biogas and liquid, granular sludge formation is not necessary for successful operation of a UASB. Loading rates as high as 5 kg COD/m 3 -d are possible without granular sludge formation (Lin and Yang 1991).…”

Section: Uasbmentioning

confidence: 99%

How Much of an Advantage Can Anaerobic Technologies Provide?

Stone¹,

Reardon²

2011

proc water environ fed

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Many publications have stated that use of anaerobic processes for liquid treatment at wastewater treatment plants can provide several significant advantages over aerobic treatment. These advantages include lower operating costs, reduced energy demands, increased biogas production with potential for power generation, lower sludge production, simpler operation, and a smaller footprint. However, few of these publications have attempted to quantify these advantages and compare them to conventional aerobic processes, particularly for the treatment of municipal strength wastewaters. This paper compares several anaerobic technologies to a traditional aerobic municipal wastewater plant designed to remove carbon, solids, and nutrients to quantify and compare sludge production, footprint, energy requirements, costs, and green house gas production. It is shown that anaerobic technologies do offer advantages of reduced footprint, reduced sludge production, and reduced energy requirements. However, in terms of cost, the traditional aerobic process is most attractive when having to meet nutrient limits.

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Section: Uasbmentioning

confidence: 99%

How Much of an Advantage Can Anaerobic Technologies Provide?

Stone¹,

Reardon²

2011

proc water environ fed

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“…The UASB reactor was developed by Gazte Lettinga in 1972 during a laboratory study on anaerobic treatment of beet sugar wastewater (Lin and Yang, 1991). Among all high-rate anaerobic digesters UASB reactors have been most widely used (Chong et al, 2012).…”

Section: Up-flow Anaerobic Sludge Blanket (Uasb) Reactormentioning

confidence: 99%

“…The critical elements of UASB reactor are the influent distribution system, gas-solid separator and effluent withdrawal design (Metcalf and Eddy, 2003). Lin and Yang (1991) concluded UASB to be better performing than other advanced anaerobic systems in terms of having high specific activity (rate of reaction), handling high organic rate, retaining high concentration of biomass due to relatively slow upward flow velocity and good COD removal. The key feature of the reactor that makes it popular high rate anaerobic digester (especially in tropical countries) is the availability of granular or flocculent sludge due to its upflow mode of operation, high COD removal efficiency and the ability to apply high volumetric COD loading rate as compared to other anaerobic processes (Crites and Tchobanoglous, 1998).…”

Section: Up-flow Anaerobic Sludge Blanket (Uasb) Reactormentioning

confidence: 99%

“…Gas-solid separator is present at the top for the gas and solids separation and it helps for scum removal as well. The settlement compartment is where settlement of solid into the sludge blanket occurs (Lin and Yang, 1991). The UASB reactor is initially seeded with inoculums such as digested, anaerobic, granular, flocculent and activated sludge.…”

Section: Working Of Uasbmentioning

confidence: 99%

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A simple anaerobic system for onsite treatment of domestic wastewater

Lohani¹,

Chhetri²,

Khanal³

2015

Afr. J. Environ. Sci. Technol.

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The use of anaerobic process for domestic wastewater treatment would achieve lower carbon footprint as it eliminates aeration and generate methane. Among several anaerobic treatment processes, high rate anaerobic digesters receive great attention due to its high loading capacity and chemical oxygen demand removal rate. Up-flow anaerobic sludge blanket reactor (UASB) is getting wide acceptance among several anaerobic processes. However, its application is still limited to industrial wastewater treatment. There are some unresolved problems to be accepted it in developing countries with lower temperature conditions for domestic wastewater treatment. Several studies have been carried out for the performance of UASB reactor but there is still lack of updated information especially on the issue of low temperature domestic wastewater treatment. Considering the gravity of the issue, an attempt have been made to compile updated information so as to help engineers, researchers and practitioners in the selection of reactors and future prospects of research.

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“…Lin and Yang [25] in their work about an UASB reactor have reported the use of deflectors at the settler inlet to facilitate biogas collection using the natural tendency of gas to flow vertically in liquids. The authors suggest employing a deflector with an inclination of approximately 50 • with the horizontal that was considered adequate to avoid settling sludge entrapment in the settlers.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics of Uasb Reactor Treating Domestic Wastewater: A Three-Dimensional Numerical Study

Brito

Nunes²,

Magalhães

et al. 2020

Water

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This work performed a three-dimensional numerical study to describe the hydrodynamics of upflow anaerobic sludge blanket reactor treating domestic wastewater. The simulations were made in the commercial software Ansys CFX®. Different inclinations of the gas deflector were considered, to assess its influence on the velocity field inside the reactor. In order to validate the numerical study, we used experimental data regarding the inflow, the inlet and outlet concentrations of the organic matter, the concentration of solids at the liquid-gas interface and at the reactor outlet, and the pressure field inside it. The comparison between the numerical and experimental results demonstrated small differences. The mathematical model used to describe the hydrodynamics flow in the UASB reactor was quite satisfactory since it adequately has reproduced the physical behavior inside the reactor.

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Technical review on the UASB process

Cited by 29 publications

References 65 publications

How Much of an Advantage Can Anaerobic Technologies Provide?

How Much of an Advantage Can Anaerobic Technologies Provide?

A simple anaerobic system for onsite treatment of domestic wastewater

Hydrodynamics of Uasb Reactor Treating Domestic Wastewater: A Three-Dimensional Numerical Study

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