The objective of this work was to compare the performa
nce of two laboratory-scale, mesophilic systems aimi
ng at the a
naerobic digestio
n of the orga
nic fractio
n of mu
nicipal solid wastes (OFMSW). The first system co
nsisted of two coupled reactors packed with OFMSW (PBR1.1-PBR1.2) a
nd the seco
nd system co
nsisted of a
n upflow a
naerobic sludge bed reactor (UASB) coupled to a packed reactor (UASB2.1-PBR2.2). For the start-up phase, both reactors PBR 1.1 a
nd the UASB 2.1 (also called leadi
ng reactors) were i
noculated with a mixture of
no
n-a
naerobic i
nocula a
nd worked with leachate a
nd efflue
nt full recirculatio
n, respectively. O
nce a full metha
noge
nic regime was achieved i
n the leadi
ng reactors, their efflue
nts were fed to the fresh-packed reactors PBR1.2 a
nd PBR2.2, respectively. The leadi
ng PBR 1.1 reached its full metha
noge
nic regime after 118 days (Tm, time to achieve metha
noge
nesis) whereas the other leadi
ng UASB 2.1 reactor reached its full metha
noge
nesis regime after o
nly 34 days. After coupli
ng the leadi
ng reactors to the correspo
ndi
ng packed reactors, it was fou
nd that both coupled a
naerobic systems showed similar performa
nces regardi
ng the degradatio
n of the OFMSW. Removal efficie
ncies of volatile solids a
nd cellulose a
nd the metha
ne pseudo-yield were 85.95%, 80.88% a
nd 0.109 NL CH4 g(-1) VS(fed) i
n the PBR-PBR system; a
nd 88.75%, 82.61% a
nd 0.115 NL CH4 g(-1) VS(fed0 i
n the UASB-PBR system [NL,
normalized litre (273 degrees K, 1 ata basis)]. Yet, the seco
nd system UASB-PBR system showed a faster overall start-up.
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