| 21. | In 2013, Harvest Power began operations of three anaerobic digesters in North America.
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| 22. | California has 242 sewage wastewater treatment plants, 74 of which have installed anaerobic digesters.
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| 23. | Neither approach has mixing inside the digester.
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| 24. | It also consists of the mineralised remains of the dead bacteria from within the digesters.
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| 25. | The cake can also be used as feed in digesters and gasifiers to produce biogas.
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| 26. | As of July 2013, his company has installed over 4, 500 Biofil Digesters.
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| 27. | It can be produced using anaerobic digesters ( air-tight tanks with different configurations ).
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| 28. | Anaerobic digesters can also be fed with purpose-grown energy crops, such as maize.
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| 29. | The primary styles of dry digesters are continuous vertical plug flow and batch tunnel horizontal digesters.
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| 30. | The primary styles of dry digesters are continuous vertical plug flow and batch tunnel horizontal digesters.
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