Environmental Engineering Reference
In-Depth Information
Fig. 5 Two high capacity laboratory pelletizers mounted on a single table with casters
3.2 Modifications of Second Prototype
Fabrication of the second TGER prototype began in early March 2008 and was
completed in three weeks. During fabrication, additional modifications were applied
to the second prototype that could not be applied to the first. These modifications
are discussed in more detail below.
a. Water circulation system . The material rinsing water was routed away from the
main system through an intermediate sump pump and into a 500 gallon tank (see
Fig. 6), and then routed back into the wash tank on the system using a sump
pump. There were several reasons for this modification. First, the intermediate
sump pump broke up any large debris (e.g. food slop and paper material) that
passed through the sieve. This ensured that the re-circulated liquids would not
cause any clogging of the plumbing. Using the large 500 gallon tank at ground
level also made it easier and more efficient for the operators to monitor the
fermentation process and add the necessary biocatalysts.
b. Rubber/flexible plumbing . The plumbing on the first TGER prototype was
fabricated using standard two inch PVC pipe. When operating in freezing tem-
peratures, water would collect in the pipes after operation, freeze overnight and
cause the pipes to burst, causing significant delays in operation due to the time
required to repair the pipes. The second TGER prototype therefore used a flex-
ible rubber hose with quick disconnect fittings instead of pipes, allowing the
water to be drained from the hoses after operation in order to prevent the pipes
from freezing. Flexible hosing also eliminated the possibility of pipes breaking
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