The experimental campaign was carried out using a lab-scale
SBBGR prototype (Fig. 1), which consisted of a 1 m Plexiglas
cylinder with internal diameter of 190 mm. The bottom of the
reactor (microbial bed; volume: 9 l) was filled with plastic
support material for biomass development (wheel shaped
plastic elements KMT-k1 from Kaldnes, Norway; 10 mm
diameter, 7 mm height, 630 m2/m3 specific surface, 950 kg/m3
density, 0.75 porosity) packed between two sieves. In order to
start-up the reactor, activated sludge from a local municipal
WWTP was used as inoculum.
The operation of the reactor was based on treatment cycles,
each consisting of three consecutive phases (namely
filling, reaction and drawing). During the filling phase (few
minutes), a fixed volume of wastewater was added from the
bottom of the reactor to the liquid volume retained from the
previous treatment cycle using a peristaltic pump. In the reaction
phase, the filled wastewater was continuously aerated
(with the exception of the first hour for denitrification) by air
injection through porous stones placed close to the upper
sieve and recycled through the biomass supporting material
using a recycle pump, in order to obtain a homogeneous distribution
of substrate and oxygen.
The experimental campaign was carried out using a lab-scaleSBBGR prototype (Fig. 1), which consisted of a 1 m Plexiglascylinder with internal diameter of 190 mm. The bottom of thereactor (microbial bed; volume: 9 l) was filled with plasticsupport material for biomass development (wheel shapedplastic elements KMT-k1 from Kaldnes, Norway; 10 mmdiameter, 7 mm height, 630 m2/m3 specific surface, 950 kg/m3density, 0.75 porosity) packed between two sieves. In order tostart-up the reactor, activated sludge from a local municipalWWTP was used as inoculum.The operation of the reactor was based on treatment cycles,each consisting of three consecutive phases (namelyfilling, reaction and drawing). During the filling phase (fewminutes), a fixed volume of wastewater was added from thebottom of the reactor to the liquid volume retained from theprevious treatment cycle using a peristaltic pump. In the reactionphase, the filled wastewater was continuously aerated(with the exception of the first hour for denitrification) by airinjection through porous stones placed close to the uppersieve and recycled through the biomass supporting materialusing a recycle pump, in order to obtain a homogeneous distributionof substrate and oxygen.
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