Thesis (BS Architecture) University of the Philippines Mindanao, 2020

The Philippines is projected to face water shortage based on availability-
and-demand with residential and commercial buildings responsible for over 70% of all fresh water potable water use. However, 50% of water used in
residential and commercial buildings do not require a drinking water quality.
The study aims to determine if the localized hybrid constructed wetland can be
an alternative for the commercially available graywater treatment system. The
research used experimental methods in investigating the phytoremediation
capabilities of the pre-selected plant species, Duckweed (Lemna minor), Water
hyacinth (Eichhornia crassipes), Indian shot (Canna Indica L.), Parakeet flower (Heliconia psíttacorum), Canna spp., and Taro (Colocasia esculenta). all set-
ups.
The first round of testing was intended to determine the higher
performing plant species, which were Water hyacinth (Eichhornia crassipes),
Indian shot (Canna Indica L.), and Taro (Colocasia esculenta). The second
batch of tests were to determine which water classification, the hybrid set-up
using the top performing plants, passed based on the DENR Administrative
Order No.34, Series of 1990. The results and other factors were considered
and analyzed to conclude that majority of the water parameters share a
common factor which is temperature and the constructed wetland alone cannot
reduce the number of the total coliforms. Thus, a few set-up revisions were applied such as providing a shading device and addition of a slow sand filter.
The study concluded that the best water treatment performance was achieved
by the hybrid constructed wetland with shading device and a slow sand filter
which passed class C. In total, the study demonstrates the potential of
constructed wetlands in treating graywater and can offer an alternative solution
for water shortage.