Mm. Ghangrekar et al., EXPERIENCE WITH UASB REACTOR START-UP UNDER DIFFERENT OPERATING-CONDITIONS, Water science and technology, 34(5-6), 1996, pp. 421-428
Citations number
11
Categorie Soggetti
Water Resources","Environmental Sciences","Engineering, Civil
Four laboratory upflow anaerobic sludge blanket (UASB) reactors were o
perated at different operating parameters viz., hydraulic retention ti
me (HRT), upflow velocity, organic concentration, and Ca2+ concentrati
on in the wastewater. These operating parameters gave different values
of organic loading rates (OLRs) and sludge loading rates (SLRs). The
reactor performance during start-up was evaluated at different values
of the above listed parameters. Also, the effects of these parameters
on the granule characteristics were investigated. It was observed that
COD removal efficiency at steady state was profoundly influenced by S
LR. The reactor started with SLR of 0.6 kgCOD/kgVSS.d could result in
about 50% COD removal at steady state. The reactor performance could n
ot improve even after three months of operation. Up to 0.3 kgCOD/kgVSS
.d the reactor performance was good with more than 90% COD removal at
steady state. The OLR and SLR also determine time required for the rea
ctor to achieve steady state. Different operating conditions also have
the bearing on the strength of the granules cultivated. The methanoge
nic activity measured on acetate for each reactor was observed between
0.259 and 0.909 kg CH4 COD/kgVSS.d. The sludge production in all the
reactors was between 0.087 and 0.13 kgVSS/kgCOD(in). The mathematical
model was developed in order to predict sludge production. Copyright (
C) 1996 IAWQ.