Disposal of Solid Wastes from the Paper Industry Using a CHTC-based Technology: A Preliminary Study

紙業固體廢棄物催化劑濕熱轉化研究之初探

王益真(I-Chen Wang) ； 張厚民(Hou-Min Chang) ； 蘇裕昌(Yu-Chang Su) ； 何振隆(Chen-Lung Ho) ； 彭元興(Yuan-Shing Perng)

《台灣林業科學》 21卷1期 (2006/03) Pp. 1-9

https://doi.org/10.7075/TJFS.200603.0001

摘要

The domestic paper industry is using tremendous amounts of recycled wastepaper as raw material for papermaking. Fair amounts of external matter get into the system along with the wastepaper and end up as various solid wastes. Biological treatment of mill effluents also produces large amounts of sludge. Disposal of the solid wastes presents an onerous task for the industry. Thus, we tried the catalytic hydrothermal conversion (CHTC) technology using alkali salt (Na2CO3) to catalyze the formation of hydrogen and carbon monoxide at mid-temperature (＜800℃) and atmospheric pressure. The process might be a viable technique for disposing of organic solid wastes and recovering the energy contained therein, thereby effectively reducing the volume. In trial process, rejects from wastepaper-based paper mills and their sludge were tested. Sericite (a mica mineral) was found to facilitate heat transfer and enable good conversion efficiencies. In the first series, reacted ashes had less than 5% volatile substances, indicating effective volume reduction, even with the passive mode of reaction (no steam injection or agitation) and more than 40% hydrogen emissions in the flue gas. Overall we deemed the process viable, but reactor design must enable good mixing and high-temperature steam injection to arrive at the potential optimal reaction conditions.

關鍵字

催化劑濕熱轉化 ； 固體廢棄物 ； 處置法 ； 回收能量 ； 減容

並列摘要

The domestic paper industry is using tremendous amounts of recycled wastepaper as raw material for papermaking. Fair amounts of external matter get into the system along with the wastepaper and end up as various solid wastes. Biological treatment of mill effluents also produces large amounts of sludge. Disposal of the solid wastes presents an onerous task for the industry. Thus, we tried the catalytic hydrothermal conversion (CHTC) technology using alkali salt (Na2CO3) to catalyze the formation of hydrogen and carbon monoxide at mid-temperature (＜800℃) and atmospheric pressure. The process might be a viable technique for disposing of organic solid wastes and recovering the energy contained therein, thereby effectively reducing the volume. In trial process, rejects from wastepaper-based paper mills and their sludge were tested. Sericite (a mica mineral) was found to facilitate heat transfer and enable good conversion efficiencies. In the first series, reacted ashes had less than 5% volatile substances, indicating effective volume reduction, even with the passive mode of reaction (no steam injection or agitation) and more than 40% hydrogen emissions in the flue gas. Overall we deemed the process viable, but reactor design must enable good mixing and high-temperature steam injection to arrive at the potential optimal reaction conditions.

並列關鍵字

CHTC catalytic hydrothermal conversion ； solid wastes ； disposal ； energy recovery ； volume reduction