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| Alkali pretreatment (1) |
| Anaerobic digestion membrane bioreactor (1) |
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| Pulp and paper mill sludge (1) |
| Alkali pretreatment (1) |
| Anaerobic digestion membrane bioreactor (1) |
| Biogas production (1) |
| Biogas yield (1) |
| Pulp and paper mill sludge (1) |