NOVELTY - Treating a solution containing lignocellulosic material comprises providing a quantity of activated carbon, producing modified activated carbon by contacting the activated carbon with one of an oxidizing agent and a cationic polymer, mixing the modified activated carbon with the solution for a time duration suitable for adsorbing lignocellulosic material onto the modified activated carbon, and separating the modified activated carbon having the lignocellulosic material adsorbed on it from the solution.    USE - The method is useful for treating a solution containing lignocellulosic material and for extracting lignocellulosic organic material from a lignocellulosic solution (claimed).    ADVANTAGE - The method is simple and economical.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a method-I of extracting lignocellulosic organic material from a lignocellulosic solution comprising providing a quantity of calcium carbonate or lime, forming a mixture including the lignocellulosic solution and calcium carbonate or lime, providing a quantity of a cationic polymer for inducing flocculation of the lignocellulosic organic material, adding the cationic polymer to the mixture and mixing for a time duration suitable for adsorbing lignocellulosic organic material onto the calcium carbonate or lime, separating the calcium carbonate or lime from the mixture, and obtaining calcium carbonate having the lignocellulosic organic material adsorbed on it; and    (2) a method-II of treating a lignocellulosic solution, the lignocellulosic solution containing lignin, acetic acid, and hemicellulose sugars, comprising providing a quantity of adsorbent configured to adsorb the lignin, mixing adsorbent with the lignocellulosic solution for a time duration suitable for adsorbing a substantial portion of the lignin onto the adsorbent, separating the adsorbent from the lignocellulosic solution, providing a quantity of an ion exchange resin, where the ion exchange resin is configured to adsorb acetic acid, contacting the ion exchange resin with the lignocellulosic solution and extracting acetic acid onto the ion exchange resin, separating the ion exchange resin from the lignocellulosic solution, providing a filter configured to capture hemicellulose sugars, and filtering the lignocellulosic solution with the filter, and concentrating the hemicellulose sugars, where the step of mixing the adsorbent with the lignocellulosic solution is performed prior to the steps of contacting the ion exchange resin with the lignocellulosic solution and filtering the lignocellulosic solution with the filter, such that the lignin is removed prior to the removal of acetic acid and hemicellulose sugars.