Method and plant for treatment of organic waste

This invention describes a multi-step process for treating organic waste, especially fibrous material, to recover valuable nutrients. Waste is first fermented in a biogas digester, then the liquid portion is separated, heated, and flashed to remove carbon dioxide. Finally, its pH is raised, for example with sodium hydroxide, to strip out ammonia, which can be used as a fertilizer.

Why it matters: Stricter environmental regulations on nutrient discharge and the rising value of recovered fertilizers make this complex waste treatment process more attractive today.

Status: Not in forceListed as no longer active. The specific reason is not in the record we hold.
How hard to build: SpecializedIndustrial-scale chemical process equipment, waste treatment.

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