Open AccessContinuous Subcritical Water Hydrolysis for Pre-treatment of Palm Oil Mill Effluent (POME)
Author(s) -
Sns Noh,
Najwa Hassou,
Mohd Nawawi,
Hiroyuki Yoshida,
Shamsul Izhar
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/765/1/012058
Subject(s) - pome , pulp and paper industry , yield (engineering) , chemistry , sugar , hydrolysis , biomass (ecology) , effluent , environmental science , environmental engineering , materials science , food science , biochemistry , agronomy , metallurgy , engineering , biology
The pre-treatment of palm oil mill effluent (POME) was carried out using subcritical water (Sub-CW). Sub-CW has the potential as a clean and green method to extract, hydrolyze, gasifier, and carbonize biomass to produce valuable materials. The experiment was conducted continuously for 1 hour at 190, 220, and 260°C between 40 and 140 bars. The hydrolysate obtained was separated into liquid and solid phases. The continuous mode stability was investigated at 3 and 7 mL/min, corresponding to the reactor residence time (RT) of 7 and 3 min, respectively. The flowrate gave a steady trendline with less variation at lower temperatures and slight fluctuation for higher temperatures. The highest solid yield was 0.085 wt.% obtained at 260°C and RT=3 min. The highest sugar yield was 4.44 wt.% at 230°C and RT=3 min. The lowest COD value was 5,504 mg/L achieved at 230°C and RT=3 min. The COD was reduced by 78.9 % of the raw POME. High sugar yield paired with reduced COD reached at 230°C in only 3 min, which is significantly low compared to the ponding system. In conclusion, integrating Sub-CW in a continuous mode as a pre-treatment method offers a promising alternative and sustainable solution for POME treatment.