Abstract:
The objectives of this research were to study the COD removal efficiency and biogas production of
an upflow anaerobic filter for wastewater from sea fish processing plant. This wastewater contains
high organic contents that cause the pollution. The upflow anaerobic filter has a capacity of 25 L. It
contained a filter medium with a specific surface area of 190 m to the power of 2/m to the power of 3.The raw wastewater used in
this study was obtained from sea fish processing plant, located at Samutsakorn province, with the
influent COD of 10,285-80,000 mg/L and pH around 6.09-7.02. All experiments were performed at
room temperature with organic loading rate (OLR) of0.6, 0.8 and 1.0 kg COD/(m to the power of 3 ํd) and hydraulic
retention time (HRT) of 2, 3 and 4 days.
The experimental results indicated that, at HRT of 2, 3 and 4 days, the COD removal efficiency
were between 60-79.4, 71.9-83.8 and 78.7-91.6% for OLR of 1.0 kg COD/(m to the power of 3 ํd), respectively. In
addition, the corresponding biogas productions were between 8-10.6, 11.5-14.7 and 11.5-16.3 L,
respectively.
The biogas produced from this wastewater type could suitably used as an alternative energy. The
recommended condition for biogas production was at HRT of 4 days and OLR of 1.0 kg
COD/(m to the power of 3 ํd) with the biogas production of 11.5-16.3 L and methane obtained in the biogas around
55-75%.