Tarlac HBS Project
Brgy.
October,
2007
Editor’s
NOTEs:
·
This
HBS was built under extreme & difficult conditions.
·
Learn
what to avoid, how to solve problems, etc.
·
Our
thanks go to the owners of this HBS for allowing us to photograph.
The unit
was built to capture biogas produced and seen asbubbles
in the manure pit.
Gas that simply escapes into the atmosphere causing
pollution.
The biogas will be used for cooking to save money from buying firewood,charcoal,
kerosene, LPG, etc. It will also help prevent Global Warming.
As building was done during the rainy season, water startedseeping in at 1.5 meters
deep. It is probable, some of this water was seeping from the manure pit
thatwas less
than 10 meters away. (Sometimes you have no choice but to build near the manurepit.
If so, learn what to do to ensure water tight floor & walls for thedigester.)
A pump
was used to remove water while the foundationfootings
were being installed.
Since water seepage was too strong, the builders decided to continue installingthe walls
and worry about the seepage later. (They decided to finish the project evenwith the
seepage, try the digester & work on re-sealing it in the summer ifnecessary)
The inlet & outlet pipes and the expansion tank.
The
manhole to be used in entering the HBS after the coverslab
is installed – to remove
form works and to seal the ceiling & inside walls. The
inlet & outletpipes as seen inside
the HBS.
Inlet
pipe fitted with a basin. Note short piece of pipethat
can be inserted in & out of
basin drain hole for use as a plug (to allow pre-mixing of manure.)
Outlet
pipe as it appears in the expansion tank. Noticeagain,
how a short piece of pipe
can be inserted in & out of the outlet hole – to control the in &out
flow of digestate
(i.e: to trap solids & sediments in the expansion
tank and keep them fromre-entering
the digester.)
The
pivoting exit pipe:
Note how it can bere-positioned (horizontally) to
drain the
contents of the expansion tank or at a selected angle so that sediments canexit the
expansion tank.
Biogas
Piping: They are
installed at a inclined angleto
allow condensation & moisture to
flow back into the digester. Position-wise, they should have been higher (orcloser to the
ceiling.) Only one pipe is needed. The second pipe is a spare.
Final
piping, Burner connection & Burner with biogasflame
(below)
