Organic Forward Osmosis System

An organic forward osmosis system that simultaneously treats digester centrate, recovers digester biomass intended for Organic Certified fertilizer, and augments that biomass with phosphorus and nitrogen, the system comprising:

• a digester stage comprising a digesting operation configured to produce a digester centrate stream from waste;
• an acid treatment stage coupled to the digester stage and configured to receive the digester centrate stream and augment digester biomass with phosphorus and nitrogen, the acid treatment stage comprising an acid treatment operation that uses one of Organic Certified phosphoric acid, nitric acid, and CO2 at an Organic Certifiable process pH of 3.5 to produce an acid treated, digester centrate stream in a forward osmosis reject loop and a fertilizer stream with a balanced P:K:N ratio;
• and
• a forward osmosis stage coupled to the acid treatment stage configured to receive the acid treated, digester centrate stream from the acid treatment stage, the forward osmosis stage comprising a forward osmosis operation configured to remove water from the acid treated, digester centrate stream by:
• diverting the acid treated, digester centrate stream to one side of at least one forward osmosis membrane;
• and
• contacting an opposite side of the at least one forward osmosis membrane with a salt brine stream comprising an Organic Certified compatible potash salt in a forward osmosis draw loop and osmotically pulling water across the at least one forward osmosis membrane from the acid treated, digester centrate stream to the salt brine stream using only a concentration gradient;
• and
• thereby producing a concentrated, acid treated, digester centrate stream and a diluted salt brine stream maintained in the forward osmosis draw loop.

An organic forward osmosis system that simultaneously treats digester centrate, recovers digester biomass intended for Organic Certified fertilizer, augments that biomass with phosphorus and nitrogen, and recovers water for re-use, the system comprising:

• a digester stage comprising a digesting operation configured to produce a digester centrate stream from waste;
• an acid treatment stage coupled to the digester stage and configured to receive the digester centrate stream and augment digester biomass with phosphorus and nitrogen, the acid treatment stage comprising an acid treatment operation that uses one of Organic Certified phosphoric acid, nitric acid, and CO2 at an Organic Certifiable process pH of 3.5 to produce an acid treated, digester centrate stream in a forward osmosis reject loop and a fertilizer stream with a balanced P:K:N ratio;
• and
• a forward osmosis stage coupled to the acid treatment stage configured to receive the acid treated, digester centrate stream from the acid treatment stage, the forward osmosis stage comprising a forward osmosis operation configured to remove water from the acid treated, digester centrate stream by:
• diverting the acid treated, digester centrate stream to one side of at least one forward osmosis membrane;
• and
• contacting an opposite side of the at least one forward osmosis membrane with a salt brine stream comprising an Organic Certified compatible potash salt in a forward osmosis draw loop and osmotically pulling water across the at least one forward osmosis membrane from the acid treated, digester centrate stream to the salt brine stream using only a concentration gradient;
• and
• thereby producing a concentrated, acid treated, digester centrate stream and a diluted salt brine stream maintained in the forward osmosis draw loop;
• and
• a reverse osmosis stage coupled to the forward osmosis stage configured to receive the diluted salt brine stream from the forward osmosis stage, the reverse osmosis stage comprising a reverse osmosis operation configured to pump under pressure the diluted salt brine stream to at least one reverse osmosis membrane and produce a re-concentrated salt brine stream maintained in the forward osmosis draw loop and a recycled purified water stream for re-use.