Zero-Emissions Refinery System and Method for Liquid Waste Stream Recovery of Clean Water and Valuable By-Products
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United States of America
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Dec 19, 2024
app pub date -
Jun 17, 2024
filing date -
Jun 17, 2024
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Abstract
In producing ethanol suitable for alcoholic beverages or fuels, the separation of stillage involves a complicated treatment system necessary to meet stringent air emissions standards and effluent discharge limits. High water content of stillage creates a difficult process mass flow balance configuration resulting in a large power demand and footprint. The present invention simplifies the production and usage of valuable stillage by-products and reduces net energy consumption and emissions to zero with a novel system and method involving a step sequence of: a solid liquid separation; at least one digester arrangement; a closed gas separation system; algae grow nutrient up-take system; a nutrient separation system; an ultra-filtration water system enabling the off-take by-products to be used by the system and an off-take market for the by-products and its purified water. All produced by-products including carbon dioxide (CO2) and methane (CH4) are used in the system or exported as products.
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