Effectiveness of Using Household Liquid Waste For Biogas Production With Anaerobic Fermentation
DOI:
https://doi.org/10.51601/ijse.v6i1.432Abstract
This study examined the effectiveness of utilizing household wastewater as a
substrate for biogas production through anaerobic fermentation at a
household scale in Tobarakka Village, Pitumpanua District. The objectives of
the study were to assess the ability of various types of wastewater (rice
washing, vegetable waste, and a mixture) to produce biogas and to model
their production kinetics. Samples were processed in a simple biodigester
(household-scale plastic bottles) and gas production was measured
periodically using the air displacement method; data were analyzed
statistically (ANOVA / LMM) and modeled with the Modified Gompertz
equation. The results showed that biogas production per interval decreased
over time but the 40-day accumulation was highest in the mixture treatment
(450 mL), followed by rice washing (355 mL) and vegetable waste (135 mL).
Changes in pH and mesophilic conditions (≈30–35 °C) were noted to support
methanogenic activity even though the final pH was close to the lower
optimal limit. The ANOVA/LMM test indicated that the effect of time was
highly significant (p < 0.001), the effect of treatment was approaching
significance (p ≈ 0.050), and the Treatment×Time interaction was significant
(p = 0.028), suggesting different production patterns between substrates over
time.Modified Gompertz modeling confirmed the mixture as the substrate with
the highest cumulative potential and production rate. Limitations include the
small number of replicates (n = 3) and the lack of gas composition analysis
(%CH₄, %CO₂, H₂S) and VFA/COD parameters; therefore, additional
replicates, gas composition measurements, and mixing ratio optimization are
recommended for further research. Practically, the utilization of household
liquid waste, especially in combination, has the potential to be a householdscale
renewable
energy
solution
while
reducing
environmental
pollution.
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