Psychrophilic anaerobic treatment of low strength wastewaters

Rebac, Salih; Lier, J.B. van; Lens, Piet N.L.; Stams, A.J.M.; Dekkers, Freddy; Swinkels, Koen Th. M.; Lettinga, G.

doi:10.1016/s0273-1223(99)00103-1

Cited by 41 publications

(1 citation statement)

References 33 publications

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“…Most industrial wastewater is discharged under moderate temperature with low and medium organic strength (Rebec et al 1999;Angenent et al 2001). Treating this kind of wastewater using anaerobic biofilm systems (UASB, fluidized bed and fixed bed) always faces the problem of shortage of substrate to biofilm, therefore causing deterioration of the physical and microbial characteristics of the biofilms.…”

Section: Introductionmentioning

confidence: 99%

Influence of effluent-recirculation condition on the process performance of expanded granular sludge bed reactor for treating low strength wastewater

Yoochatchaval

Nishiyama

Okawara

et al. 2008

Water Science and Technology

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A 2.0 L volume of EGSB reactor was operated at 20 degrees C for more than 500 days with 0.3-0.4 g COD/L of sucrose base wastewater to investigate the influence of effluent-recirculation on the process performance. At the start up period, the reactor was operated in EGSB mode with 5 m/h upflow velocity by continuous effluent recirculation. The COD loading was set to 7.2-9.6 kg COD/m(3) day with HRT of 1 hour. However, in this mode, EGSB reactor exhibited insufficient COD removal efficiency, i.e., 50-60%. Therefore, UASB mode (without recirculation, 0.7 m/h upflow velocity) was used for 30 minutes in every 40 minutes cycle to increase the COD concentration in the sludge bed. As a result, an excellent process performance was shown. The COD removal efficiency increased from 65% to 91% and the reactor could maintain a good physical property of retained sludge (sludge concentration: 33.4 g VSS/L and SVI: 25 mL/g VSS). Furthermore, retained sludge possessed sufficient level of methanogenic activity at 20 degrees C.

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Section: Introductionmentioning

confidence: 99%

Influence of effluent-recirculation condition on the process performance of expanded granular sludge bed reactor for treating low strength wastewater

Yoochatchaval

Nishiyama

Okawara

et al. 2008

Water Science and Technology

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Development of Anaerobic High-Rate Reactors, Focusing on Sludge Bed Technology

Lier

Zee

Frijters

et al. 2015

Advances in Biochemical Engineering/Biotechnology

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In the last 40 years, anaerobic sludge bed reactor technology has evolved from localized laboratory-scale trials to worldwide successful implementations in a variety of industries. High-rate sludge bed reactors are characterized by a very small footprint and high applicable volumetric loading rates. Best performances are obtained when the sludge bed consists of highly active and well settleable granular sludge. Sludge granulation provides a rich microbial diversity, high biomass concentration, high solids retention time, good settling characteristics, reduction in both operation costs and reactor volume, and high tolerance to inhibitors and temperature changes. However, sludge granulation cannot be guaranteed on every type of industrial wastewater. Especially in the last two decades, various types of high-rate anaerobic reactor configurations have been developed that are less dependent on the presence of granular sludge, and many of them are currently successfully used for the treatment of various kinds of industrial wastewaters worldwide. This study discusses the evolution of anaerobic sludge bed technology for the treatment of industrial wastewaters in the last four decades, focusing on granular sludge bed systems.

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