TY - JOUR AU - Chariyaprasertsin, Nawapon AU - Matsumura, Yukihiko AU - Charinpanitkul, Tawatchai PY - 2013/06/30 Y2 - 2024/03/29 TI - Conversion of secondary pulp and paper sludge to glucose by hydrothermal treatment JF - Journal of Metals, Materials and Minerals JA - J Met Mater Miner VL - 23 IS - 1 SE - Original Research Articles DO - UR - https://jmmm.material.chula.ac.th/index.php/jmmm/article/view/83 SP - AB - Secondary pulp/paper sludge is residue from water treatment process of the paper industry. Main components of secondary pulp/paper sludge are cellulose, hemicelluose, lignin and calcium carbonate (CaCO<sub>3</sub>). The cellulose and hemicellulose could be converted to glucose by hydrothermal treatment in a stainless steel tubular batch reactor.  It was found that dried powder of secondary pulp/paper sludge with nominal size in a range of 595 to 840 µm contains different content of CaCO<sub>3</sub>.  Therefore, effect of CaCO<sub>3 </sub>content on glucose yields was examined under designated temperature of 200-260 ºC and treating time of 0-40 minutes.  Identification and quantification of glucose and other derivatives in aqueous phase was performed with high-performance liquid chromatography.  Plausible reaction pathway of cellulose subject to hydrothermal treatment with the presence of CaCO<sub>3</sub> was proposed and discussed.  The highest glucose yield could be obtained from secondary sludge at 220<sup>o</sup>C with 20 min holding time.  It was found that CaCO<sub>3</sub> must be separated before hydrothermal treatment to again higher cellulose conversion. ER -