Performance of UASB reactor treating leachate from acidogenic fermenter inthe two-phase anaerobic digestion of food waste

Shin, HS Han, SK Song, YC Lee, CY

Hs. Shin et al., Performance of UASB reactor treating leachate from acidogenic fermenter inthe two-phase anaerobic digestion of food waste, WATER RES, 35(14), 2001, pp. 3441-3447

20

INGLESE

Article

Environment/Ecology

WATER RESEARCH

0043-1354 → ACNP

35

14

2001

3441 - 3447

ISI

0043-1354(200110)35:14<3441:POURTL>2.0.ZU;2-#

This study was conducted to investigate the performance of the upflow anaer obic sludge blanket (UASB) reactor treating leachate from acidogenic fermen ter in the two-phase anaerobic digestion of food waste. The chemical oxygen demand (COD) removal efficiency was consistently over 96% up to the loadin g rates of 15.8 g COD/1d. The methane production rate increased to 5.51/1 d . Of all the COD removed, 92% was converted to methane and the remaining pr esumably to biomass. At loading rates over 18.7 g COD/1d, the COD removal e fficiency decreased due to sludge flotation and washout in the reactor, whi ch resulted from short HRT of less than 10.6 h. The residual propionate con centration was the highest among the volatile fatty acids (VFA) in the effl uent. The specific methanogenic activity (SMA) analysis showed that the VFA -degrading activity of granule was the highest for butyrate, and the lowest for propionate. Typical granules were found to be mainly composed of micro colonies of Methanosaeta. The size distribution of sludge particles indicat ed that partially granulated sludge could maintain the original structure o f granular sludge and continue to gain size in the UASB reactor treating le achate from acidogenic fermenter. (C) 2001 Elsevier Science Ltd. All rights reserved.