On biogas digesters combined
with latrines: In your experience, what is the track
record of communities' ability to properly maintain
the biogas digesters? Do communities actually use
Monitoring activities over two years after
construction of over 40 units in 29 Philippine
villages reveal that all biogas digesters, except
one, are in
operation as septic tanks.
But only about a dozen are being used for
cooking. The latter is due to cultural reasons
(squeamishness about using biogas from human waste
Households having backyard livestock and fitted with
biogas septic tanks almost always use it for
biogas digesters have proved to be trouble-free,
with only two instances of trouble being noted
(loosening of the tethering of the tarp gas
collector), and both were repaired voluntarily by
Do iron removal filters
actually remove Iron?
Do they use
galvanized metal (nails) to remove arsenic? Please
clarify if it is Iron that is actually being removed
from the water in addition to any other toxins.
The iron removal filter removes at least 92% of the
iron, and the hydrogen sulfide (H2S) and
any suspended matter.
Removal of some of the hardness was also
even some manganese as well.
removal filter's present design is not specifically
configured for arsenic removal, but it can be
modified as such, although as per our Department of
Health national data, there is only one instance of
arsenic detection in the Philippines so far, and it
was a fleeting reading.
Do you have a rough estimate of how many total
installations (latrines, filters, rainwater tanks)
PCWS-ITNF has installed in the Philippines?
PCWS-ITNF and the organizations we trained have
constructed about 2,000 rainwater harvesting tanks;
about 100 bio-sand filters; 80 iron removal filters;
and about 80 biogas digester septic tanks.
Could you share some technical materials based
from PCWS-ITNF field experiences?
Ferro cement spring box
Pinoy construction manual