Re-activation characteristics of preserved anaerobic granular sludges

Bae, Byung-Uk; Shin, Hang‐Sik; Paik, Byeong-Cheon; Chung, Jae-Chun

doi:10.1016/0960-8524(95)00089-w

Cited by 22 publications

(3 citation statements)

References 8 publications

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“…Additionally, when AFBR and UASB reactors treating raw municipal wastewater were fed again after 4 months of inoperation at 22.5°C, the AFBR responded faster (Sanz and Fdz-Polanco, 1989). According to Bae et al (1995), anaerobic granules starved for 10 months recovered quickly at 35°C. Methanogenic granules stored for 18 months at 4 or 22°C reached their original degradation rate in 15 to 20 days at 35°C (Wu et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Low‐Strength Wastewater Treatment Using an Anaerobic Baffled Reactor

Manariotis

Grigoropoulos²

2002

Water Environment Research

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A 14.7-L, three-chamber anaerobic baffled reactor (ABR) was used to evaluate the treatment of low-strength synthetic wastewater (chemical oxygen demand [COD] of 300 to 400 mg/L) and assess process reactivation after a prolonged period of inactivity. The reactor was inoculated with anaerobic seed and start-up was immediate. At 26°C and hydraulic retention times (HRTs) of 24 and 12 hours, COD removal averaged 87.2 and 91.0%, respectively, and biogas yield for methane (CH 4 ) was 0.184 and 0.102 m 3 CH 4 /kg COD removed, respectively. The ABR was reactivated after two years without feeding. Response was prompt and removal averaged 85.3% even during the initial 10-day period. Lowering temperature to 16°C did not impair removal efficiency at HRTs of 24 and 12 hours. However, biogas release decreased by 30% and apparent COD conversion to methane dropped by 24 and 31%, respectively. At the end of the study, biomass was mostly in the bottom of the reactor and had moved from the first to the second chamber, while organic stabilization was occurring essentially in the first two chambers (56.1 and 22.4%, respectively, in terms of COD). Water Environ. Res., 74, 170 (2002).

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Section: Introductionmentioning

confidence: 99%

Low‐Strength Wastewater Treatment Using an Anaerobic Baffled Reactor

Manariotis

Grigoropoulos²

2002

Water Environment Research

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“…The first reported observation of granular sludge in a UASB system was in a 6 m3 pilot plant, inoculated with digested sewage sludge, during 1974-1976 for treating beet sugar factory wastewater in Breda, The Netherlands (Lettinga et al, 1979(Lettinga et al, & 1980de Zeeuw, 1988). The success of UASB reactor systems has been attributed to the formation of the granules that have been found to be wellsettled and active biomass (Hulshoff Pol et al, 1983;Wiegant et al, 1986;Alibhai and Forster, 1986b;de Zeeuw, 1988;Hickey et al, 1991;Fang et al, 1994;Bae et al, 1995;Liu and Tay, 2002).…”

Section: Granulation Processmentioning

confidence: 99%

Carbon and Nitrogen Removal in a Granular Bed Baffled Reactor

Baloch¹,

Akunna²,

Collier³

2006

Environmental Technology

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The application of an anaerobic five compartment granular bed baffled reactor (GRABBR) was investigated with brewery wastewater for combined carbon and nitrate removal, with a separate downstream nitrification unit for converting ammonia to nitrate. The GRABBR was operated at an organic loading rate of 3.57 kg chemical oxygen demand (COD) m(-3) d(-1) and ammoniacal nitrogen (NH4-N) loading rate of 0.13 kg NH4-N m(-3) d(-1) when nitrified effluent from a downstream nitrification unit was recycled to the feed point of the GRABBR. Carbonaceous matter and nitrate were removed simultaneously in the GRABBR at different recycle to influent ratios (from 1 to 2), with nitrogen oxide (nitrate and nitrite nitrogen, NOx-N) loading rates varying from 0.04 to 0.05 kg NOx-N m(-3) d(-1). At all recycle to influent ratios, COD removal efficiency of 97% to 98% were observed in the GRABBR, and over 99% by the two-stage treatment configuration (i.e. GRABBR and nitrification unit). All the nitrates added to the GRABBR were denitrified in the first three compartments of the system. For all the recycle to influent ratios studied, almost all ammonia was converted to nitrate nitrogen with only small traces of nitrite nitrogen in the nitrification unit. Methane production was observed throughout the experimental period with its composition varying from 25% to 50%, showing that simultaneous methanogenesis and denitrification occurred. This study shows that a GRABBR could bring about a high degree of carbon and nitrate removal, with simultaneous methanogenesis and denitrification, due to plug flow granular bed multi-stage characteristics of the bioreactor.

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“…Recently, several studies have investigated storage of microbial mixed cultures of relevance in environmental biotechnology. For example, investigations of the effect of storage temperature on anaerobic sludge showed that anaerobic granules could be stored for 10 months at room temperature 5 and storage of anaerobic sludge at room temperature or refrigerated conditions (4 °C) allowed faster re-activation than freezing (−20 °C) or freeze-drying 6 . For aerobic granular sludge, temperature was shown to have an important effect with storage at low temperature (4 °C or freezing) allowing better preservation of granule structure and activity than storage at room temperature 7 8 .…”

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confidence: 99%

Effects of storage on mixed-culture biological electrodes

Saheb-Alam

Persson

Wilén

et al. 2015

Sci Rep

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Storage methods are important to preserve the viability and biochemical characteristics of microbial cultures between experiments or during periods when bioreactors are inactive. Most of the research on storage has focused on isolates; however, there is an increasing interest in methods for mixed cultures, which are of relevance in environmental biotechnology. The purpose of this study was to investigate the effect of different storage methods on electrochemically active enrichment cultures. Acetate-oxidizing bioanodes generating a current density of about 5 A m−2 were enriched in a microbial electrolysis cell. The effect of five weeks of storage was evaluated using electrochemical techniques and microbial community analysis. Storage by refrigeration resulted in quicker re-activation than freezing in 10% glycerol, while the bioelectrochemical activity was entirely lost after storage using dehydration. The results showed that the bioelectrochemical activity of bioanodes stored at low temperature could be retained. However, during the re-activation period the bioanodes only recovered 75% of the current density generated before storage and the bacterial communities were different in composition and more diverse after storage than before.

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Re-activation characteristics of preserved anaerobic granular sludges

Cited by 22 publications

References 8 publications

Low‐Strength Wastewater Treatment Using an Anaerobic Baffled Reactor

Low‐Strength Wastewater Treatment Using an Anaerobic Baffled Reactor

Carbon and Nitrogen Removal in a Granular Bed Baffled Reactor

Effects of storage on mixed-culture biological electrodes

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