This study investigated the production of methane using various substrates. Plantain peels, pig dung, poultry droppings, walnut peels/plantain peels and cow blood/wheat waste were all co-digested, charged in digesters (A-E) and allowed to ferment anaerobically for forty-five (45) days within the mesophilic temperature range of 20.0-39.0°. Digester A contained 3.9 Kg of wheat waste/cow blood and 19.5 Kg of water in the ratio of 1.5 which gave a total gas yield of 22.5 L of biogas; B contained 7.8 Kg of walnut peels/plantain peels and 15.6 Kg of water in the ratio 1:2 which gave a total gas yield of 115.0 L; C contained 8 Kg of plantain peels and 16 Kg of water which yielded 133.0 L of biogas; D contained 8 Kg of pig dung mixed thoroughly with 16 Kg of water which gave a total of 321.0 L; and E contained 8 Kg of poultry droppings mixed with 16 Kg of water which yielded 168.5 L of biogas. From the cumulative comparison of the biogas yields of the samples, pig dung gave the highest yield of 321 L and cow blood/wheat husk produced the lowest yield of 22.5 L. Pig dung (animal waste) gave the highest total viable count (TVC) of 7 × 10⁶ cfu/mL. The sludge contains NPK which is a good biofertilizer.

中文翻译：

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甲烷产量的提高以及一些动植物废弃物的生物降解比较研究

这项研究调查了使用各种底物生产甲烷的情况。将车前草皮，猪粪，家禽粪便，胡桃皮/车前草皮和牛血/小麦废料一起消化，装入消化池（AE）中，并在中温温度范围内厌氧发酵四十五（45）天。 20.0-39.0°。消化器A含有3.9千克小麦废料/牛血和19.5千克水（比例为1.5），总沼气产量为22.5升。B以1∶2的比例含有7.8Kg核桃皮/车前草皮和15.6Kg水，总气体产量为115.0L。C包含8公斤的车前草皮和16公斤的水，产生133.0升沼气；D含有8 Kg猪粪与16 Kg水充分混合，总共321.0 L；E中包含8 Kg家禽粪便和16 Kg水混合，产生168.5 L沼气。从样品的沼气产量的累积比较中，猪粪产生的最高产量为321 L，牛血/小麦皮产生的最低产量为22.5L。猪粪（动物粪便）的总可行量最高（TVC）的7×10⁶  cfu / mL。污泥中含有NPK，这是一种良好的生物肥料。