Advanced search

Different types of sludge granules in UASB reactors treating acidified wastewaters

Author
Organization
Abstract
The influence of a high energy substrate, i.e. sucrose, on the granular sludge yield and the development of different types of granular sludge was investigated by using Upflow Anaerobic Sludge Bed (UASB) reactors fed with synthetic wastewater. The feed COD was a mixture of volatile fatty acids (VFA) i.e., 20, 40, and 40% of the COD as C-2-, C-3-, and C-4-VFA, respectively. Furthermore, experiments were carried out in which 10 and 30% of the VFA COD was substituted with sucrose. The following distinctly different types of granules were observed in each testrun: in the reactor fed with solely VFA, black (B) and white (W) granules developed; in the reactor fed with a mixture of 90% VFA and 10% sucrose, three types of granules i.e., B, W, and grey (G) granules could be seen; in the reactor fed with 70% VFA and 30% sucrose, only W and G granules were found. The granular sludge yield increased proportional to the amount of sucrose GOD. At steady-state performance of the reactors, specific acidogenic (SAA) and methanogenic (SMA) activity tests on these granules revealed that B granules had the highest SMA with low SAA. The W granules had very high SMA with low SAA. G granules gave the highest SAA with a considerable SMA. Measurement of coenzyme F-420 revealed that B granules consist mainly of acetoclastic methanogens. The fore-mentioned tests were supplemented with analyses of the wash-out cells present in the reactor effluent and the results suggested that acidogens, if present, prevail at the granule surface. The B granules were particularly rich in Ca, Mn, and Zn minerals. The size distribution analysis showed that the granule diameter increased in the following order: B < W < G granules. The biogas bubbles tended to adhere to the B and W granules but not so strongly to the G granules.
Keywords
UASB reactors, granular sludge, acidogenic and methanogenic activities, F-420 coenzyme, elemental compositions, flotation, ANAEROBIC SLUDGE

Citation

Please use this url to cite or link to this publication:

Chicago
Thaveesri, J, D Daffonchio, Bart Liessens, and Willy Verstraete. 1995. “Different Types of Sludge Granules in UASB Reactors Treating Acidified Wastewaters.” Antonie Van Leeuwenhoek International Journal of General and Molecular Microbiology 68 (4): 329–337.
APA
Thaveesri, J., Daffonchio, D., Liessens, B., & Verstraete, W. (1995). Different types of sludge granules in UASB reactors treating acidified wastewaters. ANTONIE VAN LEEUWENHOEK INTERNATIONAL JOURNAL OF GENERAL AND MOLECULAR MICROBIOLOGY, 68(4), 329–337.
Vancouver
1.
Thaveesri J, Daffonchio D, Liessens B, Verstraete W. Different types of sludge granules in UASB reactors treating acidified wastewaters. ANTONIE VAN LEEUWENHOEK INTERNATIONAL JOURNAL OF GENERAL AND MOLECULAR MICROBIOLOGY. 1995;68(4):329–37.
MLA
Thaveesri, J, D Daffonchio, Bart Liessens, et al. “Different Types of Sludge Granules in UASB Reactors Treating Acidified Wastewaters.” ANTONIE VAN LEEUWENHOEK INTERNATIONAL JOURNAL OF GENERAL AND MOLECULAR MICROBIOLOGY 68.4 (1995): 329–337. Print.
@article{186724,
  abstract     = {The influence of a high energy substrate, i.e. sucrose, on the granular sludge yield and the development of different types of granular sludge was investigated by using Upflow Anaerobic Sludge Bed (UASB) reactors fed with synthetic wastewater. The feed COD was a mixture of volatile fatty acids (VFA) i.e., 20, 40, and 40\% of the COD as C-2-, C-3-, and C-4-VFA, respectively. Furthermore, experiments were carried out in which 10 and 30\% of the VFA COD was substituted with sucrose. The following distinctly different types of granules were observed in each testrun: in the reactor fed with solely VFA, black (B) and white (W) granules developed; in the reactor fed with a mixture of 90\% VFA and 10\% sucrose, three types of granules i.e., B, W, and grey (G) granules could be seen; in the reactor fed with 70\% VFA and 30\% sucrose, only W and G granules were found. The granular sludge yield increased proportional to the amount of sucrose GOD. At steady-state performance of the reactors, specific acidogenic (SAA) and methanogenic (SMA) activity tests on these granules revealed that B granules had the highest SMA with low SAA. The W granules had very high SMA with low SAA. G granules gave the highest SAA with a considerable SMA. Measurement of coenzyme F-420 revealed that B granules consist mainly of acetoclastic methanogens. The fore-mentioned tests were supplemented with analyses of the wash-out cells present in the reactor effluent and the results suggested that acidogens, if present, prevail at the granule surface. The B granules were particularly rich in Ca, Mn, and Zn minerals. The size distribution analysis showed that the granule diameter increased in the following order: B {\textlangle} W {\textlangle} G granules. The biogas bubbles tended to adhere to the B and W granules but not so strongly to the G granules.},
  author       = {Thaveesri, J and Daffonchio, D and Liessens, Bart and Verstraete, Willy},
  issn         = {0003-6072},
  journal      = {ANTONIE VAN LEEUWENHOEK INTERNATIONAL JOURNAL OF GENERAL AND MOLECULAR MICROBIOLOGY},
  keyword      = {UASB reactors,granular sludge,acidogenic and methanogenic activities,F-420 coenzyme,elemental compositions,flotation,ANAEROBIC SLUDGE},
  language     = {eng},
  number       = {4},
  pages        = {329--337},
  title        = {Different types of sludge granules in UASB reactors treating acidified wastewaters},
  url          = {http://dx.doi.org/10.1007/BF00874143},
  volume       = {68},
  year         = {1995},
}

Altmetric
View in Altmetric