The CABH alkalization, which occurs during the pH adjustment,is also considered a method of detoxification, which consists of adding alkali to the hydrolysate, increasing its pH above 10, under controlled temperature and reaction time conditions (overliming).At the end of the process, the pH of the mixture is adjusted tothat required by the microorganism with H2SO4and the precipitate formed is removed by filtration or centrifugation. This method has some advantages as: low cost, partial removal of acetic acid and phenolic compounds, precipitation of toxic metal ions as Fe, Ni, Cr,and conversion of furfural to less toxic compounds (such as furfurylacid), metabolizable by microorganism fermentation [27].