Zero-emissions refinery system and method for liquid waste stream recovery of clean water and valuable by-products

A system for a zero emissions refinery of stillage waste streams recovery of clean water and valuable by-products, the system comprising:

• a first system being configured to collect raw stillage stream mixture, wherein the raw stillage stream includes at least 5% concentration of organic matter and unpurified water;
• at least one anaerobic digester being configured to act on the raw stillage stream mixture and to produce a digestate stream and a biogas mixture stream, wherein the digestate stream contains sulfite, and wherein the biogas mixture stream includes hydrogen sulfide stream;
• at least one liquid-gas scrubber being configured to convert the biogas mixture stream into a liquid sulfur compound during an anaerobic action while enriching biogas production and purifying a main gas stream from the hydrogen sulfide;
• at least one CO2 gas separation unit being configured to produce a methane-enriched product stream and a CO2 gas-enriched off gas stream;
• a second system being configured to export purified methane from the methane-enriched product stream as renewable natural gas;
• at least one vacuum pressure swing adsorption (VPSA) unit being configured to perform an off-gas stream adsorption procedure and thereby forming a CO2 vent gas stream and a CH4 recycle stream;
• at least one gas liquefying unit being configured to collect the CO2 vent gas stream as liquefied CO2;
• at least one gas evaporator unit being configured to inject the liquefied CO2 as gaseous CO2 into an Algae grow environment;
• at least one nutrients-water-solids separator unit being configured to create a self-sustaining grow liquid environment for Algae;
• a third system being configured to separate and export of nutrients and solid remains as valuable by-products;
• a fourth system being configured to react a liquid grow stream to increase Algae growth and reduce nutrient loading of the liquid grow stream for Algae;
• at least one water filtering unit being configured to filter upstream reduced nutrients and solids from the liquid grow stream to create acceptable clean water for reuse;
• and
• a fifth system being configured to recycle the upstream reduced nutrients and solids from the at least one water filtering unit back into the at least one nutrients-water-solids separator unit.