4.2 Discussion
The basis of this study was to explore the possibility of producing
biogas with water hyacinth and using it, instead of firewood for cooking
which has been proven, as confirmed by certain authors (Chanakya et
al., 1993; Kivaisi and Mtila, 1998; Singhal and Rai, 2003; Kumar,
2005). In this study, Biogas outflow was clearly related to seasonal
variations in temperature. For the same retention time, the total volume
of biogas obtained during the warm season was greater than that obtained
during the cool season.
The biogas produced was flammable, combustible with odor, and on
combustion produced blue flame indicating the presence of methane. This
odor can be attributed to the presence of other gases such as
H2S. The study thereof revealed that the higher the
dilution level and presence of cow dung, the higher the biogas
production yields. Thence, the production of biogas from water hyacinth
can serve as a sustainable control measure for managing weed
proliferation. Additionally, the slurry can serve as a rich fertilizer
for crops.
4.2.1 Observation
- Soluble gases were dissolved in the water and since methane does not
dissolve in water it is passed into the gas bag.
- When the gases passed from the digester into the scrubber they caused
some bubbles.
- An increase in pressure led to expanding of the digester
- Bubbles first appeared when the temperature was at
40oC and gas production started.