METHOD AND APPARATUS FOR MANUFACTURING A HYDROXYCARBOXYLIC ACID PRODUCT AND USE OF BLEACHING FILTRATE

摘要

The invention relates to a method and an apparatus for manufacturing a hydroxycarboxylic acid product from lignocellulose-based raw material. According to the invention,a first effluent (2) used as a raw material is concentrated to provide a concentrate (3), the concentrate (3) is treated by a hydrolysis (11) to form saccharides (4), the saccharides (4) are fermented (12) to form hydroxycarboxylic acid, and the pH of the fermentation (12) is controlled by using a second effluent (16), for forming a hydroxycarboxylic acid product. Further, the invention relates to use of a bleaching filtrate.