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Anaerobic DigestionBiogas ProductionVolatile SolidsWheat StrawHydraulic Retention TimeVolatile Fatty AcidsAgricultural WastesCrude Protein ContentDry MatterPoultry ManureCrude ProteinNutritive ValueAerobic TreatmentPig ManureAnaerobic TreatmentMethane FermentationPiggery WasteSewage SludgeCOD RemovalGas Production