Triggering forces for anaerobic granulation in UASB reactors

Zhou, Weili; Imai, Tsuyoshi; Ukita, Masao; Sekine, Masahiko; Higuchi, Takaya

doi:10.1016/j.procbio.2005.02.029

Cited by 75 publications

(42 citation statements)

References 23 publications

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“…Methanol was found to be the best carbon source, showing 95% 2-chlorophenol and 81.1% 2,4-dichlorophenol removals. In another study by Zhou et al (2006), a UASB reactor was fed with three kinds of different substrates, glucose, skim milk and mixed volatile fatty acids (VFAs). Under mesophillic conditions at pH 7.4 and glucose substrate, 90% COD removal efficiency was achieved.…”

Section: Effect Of Glucose During the Uasb Start-up Periodmentioning

confidence: 99%

“…Many researchers have indicated that maximum COD removal efficiency related with granule formation takes three months (Yu et al, 2001;Zhou et al, 2006;Kalogo et al, 2001). As indicated in Table 7, during start-up of the UASB reactor the maximum removal efficiency of 95% was observed with cattle manure as inoculums (Akila and Chandra, 2007).…”

Section: Post Treatment Of Uasb Effluent With Waste H 2 Omentioning

confidence: 99%

“…Before direct treatment of wastewater, the UASB reactor passes through a start-up time period with selected nutrients as substrate. The study by Zhou et al (2006) proved that the substrate produced more electrolytes in the reactor, which improved the granulation and thus the treatment efficiency, as well as shortened the startup time. An anaerobic process includes principally three metabolic phases, i.e., hydrolysis, acidogenesis and methanogenesis (Cohen et al, 1982).…”

Section: Introductionmentioning

confidence: 95%

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UASB reactor startup for the treatment of municipal wastewater followed by advanced oxidation process

Bhatti

Maqbool

Malik

et al. 2014

Braz. J. Chem. Eng.

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-The present study was done to shorten the start-up time of up-flow anaerobic sludge blanket (UASB) reactor. Two different nutrients were used during the UASB start-up period, which was designed to decrease the hydraulic retention time (HRT) from 48 to 24 and 12 to 6 hrs at average temperatures of 25-34 ºC. In the first stage, start-up was with glucose for 14 days and then the reactor was also fed with macro-and micronutrients as a synthetic nutrient influent (SNI) from 15 to 45 days as the second stage. For the control, a second reactor was kept on glucose feeding from day 1 to 45. The removal efficiencies of the chemical oxygen demand (COD) were 80% and 98% on the 6 th and 32 nd day of the first and second stage, respectively. The maximum substrate removal rate of 0.08 mg COD mg -1 VSS d -1 was observed for glucose and synthetic nutrient influent (SNI) on the 8 th and 40 th days, respectively. When the reactor reached the maximum COD removal efficiency it was then shifted to municipal wastewater (MWW) mixed with industrial wastewater. The HRT was reduced gradually with a one week gap while treating MWW. For further cleaning, the UASB effluent was treated with 40% waste hydrogen peroxide. The whole integrated treatment process was successful to reduce the COD by 99%, total suspended solids (TSS) by 73%, total nitrogen (TN) by 84% and turbidity by 67%.

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Section: Effect Of Glucose During the Uasb Start-up Periodmentioning

confidence: 99%

Section: Post Treatment Of Uasb Effluent With Waste H 2 Omentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

See 1 more Smart Citation

UASB reactor startup for the treatment of municipal wastewater followed by advanced oxidation process

Bhatti

Maqbool

Malik

et al. 2014

Braz. J. Chem. Eng.

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“…) that include the hydrolysis reaction as the limiting process for the degradation of the substrate and the growth of the microorganisms. However, the kind of substrate used in the UASB reactor plays an important role in identifying the reaction controlling the conversion of the substrate (Zhou et al 2006). Acidogenic, acetogenic, and methanogenic microorganisms have also been reported to be limiting factors in anaerobic digestion (Tiwari et al 2006;Chou and Huang 2005;Huang et al 2004a;Huang et al 2004b;Hutñan et al 1999).…”

Section: Introductionmentioning

confidence: 99%

A model to describe the performance of the UASB reactor

et al. 2013

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A model to describe the performance of the UASB reactor. Abstract A dynamic model to describe the performance of the Upflow Anaerobic Sludge Blanket (UASB) reactor was developed. It includes dispersion, advection, and reaction terms, as well as the resistances through which the substrate passes before its biotransformation. The UASB reactor is viewed as several continuous stirred tank reactors connected in series. The good agreement between experimental and simulated results shows that the model is able to predict the performance of the UASB reactor (i.e. substrate concentration, biomass concentration, granule size, and height of the sludge bed).

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“…However, start-up period of anaerobic reactor which is related to the formation of anaerobic granules can be approximately longer as 2-8 months [7]. Mature granules from other reactors are normally used to shorten start-up period of anaerobic digestion.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Synthetic Cationic Polymer Addition on Nucleation of Anaerobic Granules under Different Organic Loading Rate

Hudayah¹,

Suraraksa²,

Chaiprasert³

2012

IJBBB

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Abstract-Nucleation phase with the addition of synthetic cationic polymer, polyacrylamide 8265 (MEM 8265), under different organic loading rate (OLR) was investigated. The results showed that the addition of MEM 8265 showed significant positive effects related to physico-chemical characteristics of microbial aggregates such as short nucleation time, higher size distribution of aggregates >100 µm, nuclei ratio and SVI value. The nucleation phase was achieved within 69 days. The nuclei size was 126 µm and nuclei ratio achieved 51% of total sludge. SVI was 60 ml.mg -1 SS. However, the activities of acidogenic bacteria (propionic acid-and butyric acid-degrading microorganisms) and methanogens were similar to control (without polymer addition).

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Triggering forces for anaerobic granulation in UASB reactors

Cited by 75 publications

References 23 publications

UASB reactor startup for the treatment of municipal wastewater followed by advanced oxidation process

UASB reactor startup for the treatment of municipal wastewater followed by advanced oxidation process

A model to describe the performance of the UASB reactor

The Effect of Synthetic Cationic Polymer Addition on Nucleation of Anaerobic Granules under Different Organic Loading Rate

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