초록
<P><B>Abstract</B></P> <P>Independent hydrogen production from petrochemical wastewater containing mono-ethylene glycol (MEG) via anaerobic sequencing batch reactor (ASBR) was extensively assessed under psychrophilic conditions (15–25 °C). A lab-scale ASBR was operated at pH of 5.50, and different organic loading rates (OLR) of 1.00, 1.67, 2.67, and 4.00 gCOD/L/d. The hydrogen yield (HY) progressed from 134.32 ± 10.79 to 189.09 ± 22.35 mL/gMEG<SUB>initial</SUB> at increasing OLR from 1.00 to 4.00 gCOD/L/d. The maximum hydrogen content of 47.44 ± 3.60% was achieved at OLR of 4.0 gCOD/L/d, while methane content remained low (17.76 ± 1.27% at OLR of 1.0 gCOD/L/d). Kinetic studies using four different mathematical models were conducted to describe the ASBR performance. Furthermore, two batch-mode experiments were performed to optimize the nitrogen supplementation as a nutrient (C/N ratio), and assess the impact of salinity (as gNaCl/L) on hydrogen production. HY substantially dropped from 62.77 ± 4.09 to 6.02 ± 0.39 mL/gMEG<SUB>initial</SUB> when C/N ratio was increased from 28.5 to 114.0. Besides, the results revealed that salinity up to 10.0 gNaCl/L has a relatively low inhibitory impact on hydrogen production. Eventually, the cost/benefit analysis showed that environmental and energy recovery revenues from ASBR were optimized at OLR of 4.0 gCOD/L/d (payback period of 7.13 yrs).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Psychrophilic single H2 production from MEG-based wastewater via ASBR is feasible. </LI> <LI> Maximum hydrogen yield of 189.09 mL/gMEG was achieved at OLR of 4.0 gCOD/L/d. </LI> <LI> NH4-N highly affected hydrogen productivity resulting in optimum C/N ratio of 28.5. </LI> <LI> Salinity levels up to 10 gNaCl/L have no strong inhibitory impact on H2 production. </LI> <LI> Peak environmental/bioenergy recovery profits revealed a payback period of 7.13 yrs. </LI> </UL> </P>