The performance enhancements of upflow anaerobic sludge blanket (UASB) reactors for domestic sludge treatment – A State-of-the-art review

Chong, Siewhui; Sen, Tushar Kanti; Kayaalp, Ahmet; Ang, Ha Ming

doi:10.1016/j.watres.2012.03.066

Cited by 267 publications

(217 citation statements)

References 161 publications

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“…Upflow anaerobic sludge blanket reactors (UASB) [8,9], anaerobic baffled reactor (ABR) [10], and anaerobic membrane bioreactor (AnMBR) [7,11,12] are commonly used to treat domestic wastewater. Despite the effective chemical oxygen demand (COD) removal by these anaerobic biotechnologies, some challenges still exist, such as complex three-phase separator and long solids' retention time of UASB, membrane fouling and high energy costs of AnMBR, and high land footprint of ABR.…”

Section: Introductionmentioning

confidence: 99%

Effect of Seasonal Temperature on the Performance and on the Microbial Community of a Novel AWFR for Decentralized Domestic Wastewater Pretreatment

Lü

2017

Applied Sciences

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Due to environmental burden and human health risks in developing countries, the treatment of decentralized domestic wastewater has been a matter of great concern in recent years. A novel pilot-scale three-stage anaerobic wool-felt filter reactor (AWFR) was designed to treat real decentralized domestic wastewater at seasonal temperature variations of 8 to 35 • C for 364 days. The results showed that the average chemical oxygen demand (COD) removal efficiencies of AWFR in summer and winter were 76 ± 7.2% and 52 ± 5.9% at one day and three days Hydraulic Retention Time (HRT), respectively. COD mass balance analysis demonstrated that even though COD removal was lower in winter, approximately 43.5% of influent COD was still converted to methane. High-throughput MiSeq sequencing analyses indicated that Methanosaeta, Methanobacterium, and Methanolinea were the predominant methanogens, whereas the genus Bacillus probably played important roles in fermentation processes throughout the whole operation period. The performance and microbial community composition study suggested the application potential of the AWFR system for the pretreatment of decentralized domestic wastewater.

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Section: Introductionmentioning

confidence: 99%

Effect of Seasonal Temperature on the Performance and on the Microbial Community of a Novel AWFR for Decentralized Domestic Wastewater Pretreatment

Lü

2017

Applied Sciences

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“…The anaerobic treatment of domestic wastewater by using high rate reactors such as an UASB system, along with its new upgrades and modified versions, is expectable to keep growing in the coming years, above all, due to the fact the systems are more and more efficient and present a low carbon footprint in comparison with the traditional activated sludge systems (Chong et al 2012). …”

Section: Introductionmentioning

confidence: 99%

Explicit temperature-based model for anaerobic digestion: Application in domestic wastewater treatment in a UASB reactor

Donoso‐Bravo

Bandara

Satoh

et al. 2013

Bioresource Technology

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Temperature is an important environmental variable that can strongly affect the performance of anaerobic reactors working at ambient temperatures. This study presents a mechanistic mathematical model which depends in an explicit way on the operating temperature. The cardinal temperature model function is proposed to describe the temperature dependence of the kinetic parameters and the experimental data from an UASB-degasification system was used to calibrate the model. The performance of the model is compared with the classic Arrhenius approach. The results showed that the 2 temperature-based model of the anaerobic digestion is able to reproduce a long-term reactor operation in terms of biogas production and the concentration of organic matter at fluctuating ambient temperature.

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“…The SSSAB showed high performance for wastewater treatment at moderate and low temperatures (25 -10 °C) than both TCAB and UASB, which the averages of COD removal efficiency are 88%, 80%, and 78% for SSSAB, TCAB, and UASB reactor relatively. Chong [13]reported that at low temperatures (≤20 °C), because of the relatively high accumulation of suspended solids in the sludge bed which results in insufficient solids retention time, the performance of anaerobic reactors was found to reduce, in spite of that SSSAB showed good performance at moderate and low temperatures. McCarty [14] reported that an optimum pH range of anaerobic treatment is about 7.0 to7.2, but it can proceed quite well with a pH varying from about 6.6 to 7.6.…”

Section: Bioreactor Performancementioning

confidence: 99%

Affecting Factors and Kinetics of New Developed Symmetrical Spiral Stream Anaerobic Bioreactor (SSSAB) for Wastewater Treatment

Abdelgadir¹,

Liu²,

Chen³

et al. 2016

IPCBEE

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Abstract. The comparison of symmetrical spiral stream anaerobic bioreactor (SSSAB), to three compartmentalized anaerobic bioreactor (TCAB) and upflow anaerobic sludge blanket reactor (UASB) were carried out, the performance, affecting factors, kinetics reaction and sludge features were studied with the same operational conditions under room temperature. The results showed that: the average COD removal efficiency of SSSAB (88%) was higher than that of TCAB and UASB (80% and 78 %). The first-order kinetic constant of SSSAB was 5.4 d -1 , higher than that of TCAB (3.6 d -1 ) and UASB (2.2 d -1 ). In macro scale, compared with that from TCAB and UASB, the anaerobic granular sludge from SSSAB was clearer, more black and denser. Moreover, the surface of anaerobic granular sludge from SSSAB was rough and full of channels. The total amount of extracellular polymeric substance (EPS) of anaerobic granular sludge from SSSAB was higher than that of TCAB and UASB, which provided conditions for mass transfer between sludge and substrates. The protein (PN)/ polysaccharide (PS) ratio of the sludge from SSSAB was lowest, which might indicate that it had more favorable strength and settling ability. The distribution of flocculability of the sludge from SSSAB was more reasonable, and its fluctuation was smaller compared with that from UASB.

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The performance enhancements of upflow anaerobic sludge blanket (UASB) reactors for domestic sludge treatment – A State-of-the-art review

Cited by 267 publications

References 161 publications

Effect of Seasonal Temperature on the Performance and on the Microbial Community of a Novel AWFR for Decentralized Domestic Wastewater Pretreatment

Effect of Seasonal Temperature on the Performance and on the Microbial Community of a Novel AWFR for Decentralized Domestic Wastewater Pretreatment

Explicit temperature-based model for anaerobic digestion: Application in domestic wastewater treatment in a UASB reactor

Affecting Factors and Kinetics of New Developed Symmetrical Spiral Stream Anaerobic Bioreactor (SSSAB) for Wastewater Treatment

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