Start-up criteria for a Upflow Anaerobic Sludge Blanket (UASB) reactor
A laboratory scale Upflow Anaerobic Sludge Blanket (UASB) reactor study was done with spentwash (distillery effluent) as substrate. The start-up studies revealed that the recirculation of biogas, produced during the initial stages, under low organic loading rates helps in mixing as well as partial supplementation of carbon dioxide for excess hydrogen in the reactor. The gas composition before and after recirculation, the volatile acids profile and the solids variation along the reactor height before and after recirculation were studied. The process efficiency and methane content increases substantially after recirculation of biogas and the microscopic examination of the sludge during the experiment indicates that the granules mainly composed of long multicellular filaments of rod shaped organisms, presumably methanothrix soehngenii.
KeywordsBiogas Organic Loading Organic Loading Rate Methane Content Upflow Anaerobic Sludge Blanket
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- 1.Lettinga, G. et al: Use of the Upflow Sludge Blanket (USB) reactor concept for biological wastewater treatment, especially for anaerobic treatment., Biotechnol. Bioeng. 22 (1980) 699–784Google Scholar
- 2.Plans Samsoon, et al: Effects of a recycle in upflow anaerobic sludge bed (USAB) systems., Water SA 17 (1991) 37–46Google Scholar
- 3.Lettinga, G. et al: Anaerobic treatment of sewage and low strength wastewaters (1982), in Anaerobic Treatment., Ed. Hughes et al., Pub. Elsevier, Bio-medical press, AmsterdamGoogle Scholar
- 4.Hulshoff Pol, L.W. et al: Granulation in UASB-Reactors., Wat. Sci. Tech., 15 (1982) 291–304Google Scholar
- 5.de Zeeuw, et al: Acclimation of digested sewage sludge during start-up of an upflow anaerobic sludge blanket (UASB) reactor., Proc. of 35th Ind. waste Conf., Purdue un., (1980) 39–47Google Scholar
- 6.Pette, K.C. et al: Application of UASB concept for wastewater treatment (1982)., in anaerobic digestion, Ed. Hughes et al, Pub. Elsevier Bio-medical press, AmsterdamGoogle Scholar
- 7.APHA (1989), Standard methods for the examination of water and wastewater, 17th Edition. American public health Association, Washington D.CGoogle Scholar