Methods and systems for treating fluid using a biochemical process under vacuum pressure

A method for treating a fluid that includes a particulate fraction and a soluble fraction, the method comprising:

• feeding the fluid to a treatment chamber;
• physically and biochemically transforming solids in the particulate fraction of the fluid with microbes in the treatment chamber;
• feeding at least a portion of the fluid that has been physically and biochemically treated in the treatment chamber to a vacuum chamber in which a vacuum pressure is applied to the fluid;
• evaporating off at least a portion of the soluble fraction of the fluid in the vacuum chamber as evaporate so that a thickened fluid remains in the vacuum chamber;
• recirculating at least some of the thickened fluid to the treatment chamber so that it is further physically and biochemically transformed;
• and
• controlling an amount of a dissolved gas that is stripped from the fluid into the evaporate by adjusting at least one parameter of the fluid in the treatment chamber.