Degradation characteristics of polylactide in thermophilic anaerobic digestion with hyperthermophilic solubilization condition

Wang, F.; Hidaka, T.; Oishi, T.; Tsuno, H.; Osumi, S.; Tsubota, J.
December 2011
Water Science & Technology;2011, Vol. 64 Issue 11, p2135
Academic Journal
To test whether hyperthermophilic treatment promotes polylactide (PLA) dissolution and methane conversion under anaerobic digestion conditions, a single thermophilic control reactor (55 °C) and a two-phase system consisting of a hyperthermophilic reactor (80 WC) and a thermophilic reactor (55 °C) were continuously fed with a mixture of PLA and artificial kitchen garbage. In Runs 1 and 2, the PLA dissolution ratios in the two-phase system were 79.2±6.5% and 85.2±7.0%, respectively, higher than those of the control. Batch experimental results indicated that hyperthermophilic treatment could promote PLA dissolution to a greater degree as compared with single thermophilic treatment and that ammonia addition also had a promotional effect on PLA dissolution. In the two-phase system, after hyperthermophilic treatment, dissolved PLA was converted to methane gas under the subsequent thermophilic condition.


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