NOVELTY - Recovering components from a bio-organic juice stream, involves: (A) fermenting organic compounds in the juice stream to organic acids; and (B) recovering the organic acids from the fermented juice stream using anion exchange.    USE - For recovering components from a bio-organic juice stream (preferably vegetable juice stream) (claimed). The recovered fermented organic compounds in the juice stream include organic acids such as lactic acid, acetic acid, propionic acid, butyric acid, valeric acid, citric acid, fumaric acid, xylonic acid, gluconic acid, glucuronic acid, succinic acid, tartaric acid, malic acid, maleic acid, malonic acid, ascorbic acid, chorismic acid, glucaric acid, glutaric acid, adipic acid, oxalic acid, formic acid, itaconic acid, levulinic acid, aconitic acid, ascorbic acid, kojic acid, and coumaric acid. The components recovered in the processes can be applied in animal feed, such as mixture of lactic acid and amino acids in their ammonium salts is applied in animal feed; the ammonium can be replaced by another cation, such as calcium, for monogastric animals such as porcine and poultry, and also to produce less of a burden on the environment; lactic acid recovered can be used as food and/or feed ingredient, as intermediate (precursor) for the production of the bioplastic polylactic acid (PLA), as a conservative of proteins, or to conserve grass or (wet) fiber e.g. for making paper; the other organic acids recovered from the juice stream, such as citric, fumaric or malic acid can also be applied in animal feed, or when fractionated from lactic acid be applied in human food; also these acids and other organic acids like itaconic acid can be used as precursor in chemical synthesis; and amino acids recovered in the processes can e.g. be not only applied in food and/or animal feed but also in pharmaceutical applications and/or as precursor in chemical synthesis, and are used to replace synthetic chemicals.    ADVANTAGE - The method provides an improved method for recovery of components from aqueous solutions obtained from bio-organic (e.g. vegetable) materials that are energy efficient and with minimized burden to the environment; as compared to the prior art techniques used for recovery of components from vegetable juice streams which include e.g. extraction, evaporation, membrane-filtration, crystallization, and heat coagulation of e.g. sugars or starch or proteins, where large part of soluble plant components may not be easily and efficiently recovered because of the low concentrations in which they are present. Also many of these techniques require significant amounts of capital and/or energy and/or other operational cost such as chemicals, membranes and labor costs, preventing cost-effective recovery of the components. The use of ion exchange for recovery of components from juice streams is particularly advantageous for recovery of components present in low concentrations, such as less than 5, 2, 1, 0.5, 0.2 or 0.1 (wt./vol.%) in the juice stream or in the untreated or unfermented juice stream. Non-charged organic compounds present in the juice at low concentrations are first converted to organic acids by fermentation to render them amenable to recovery by ion exchange. The process further involves a step of subjecting juice stream to cation exchange prior to or without fermentation of the juice stream at neutral pH, to recover basic amino acids like lysine and arginine, as well as cations like potassium; and also involves a step of subjecting juice stream to anion exchange at alkaline pH prior to or without fermentation of juice stream to recover most amino acids except for the basic amino acids lysine and arginine. In the process the anions obtained are eluted from an anion exchanger using ammonia i.e. ammonia is used for elution from and regeneration of the ion exchangers, as well as is used to increase the pH of the juice stream. The ammonia is gaseous ammonia and can be flushed from below through an ion exchange bed e.g. in essentially vertical column, to create a sort of fluidized bed. Elution can thus take place in a minimal liquid volume and without increasing the elution volume, and allows obtaining eluted ions in highly concentrated eluate solutions. During elution with ammonia the pH will (gradually) changes i.e. increase. This effect can be used for successive recovery in separate fractions of components each eluting at a given pH or pH range. This may advantageously be used for recovery of various amino acids in separate fractions according to their isoelectric points. Further calcium hydroxide can be used for pre-treatment or treatment of lignocellulosic materials such as e.g. biogas fermentation digestate. The calcium hydroxide renders the lignocellulosic material more accessible e.g. more amenable to enzymatic digestion, such that it may be used in a further round of biogas fermentation. The ammonia that is produced from the calcium hydroxide treatment of lignocellulosic material is integrated with ion exchange. Integration of ammonia production from calcium hydroxide treatment of lignocellulosic material, preferably biogas digestate, with the ion exchange processes advantageously avoids the costs of acid washings and an ammonium sulfate waste stream and further enables regeneration of ion exchangers without further costs for chemicals and avoiding generation of waste streams.