北京大学学报（自然科学版）2024，Vol.60Issue(4)：745-757,13.DOI:10.13209/j.0479-8023.2024.043
城市污泥水热碳化影响因素研究
Study on Influencing Factors of Hydrothermal Carbonization of Sewage Sludge
摘要
Abstract
The effects of reaction temperature,time,and medium on the properties of sludge hydrochar were experimentally studied.The results demonstrated that hydrothermal carbonization (HTC) treatment enhanced sludge dewatering and volume reduction,with a higher water removal rate (42.8％-53.3％) observed under acidic conditions compared to neutral conditions (28.9％-45.2％).Notably,the highest dehydration rate was achieved after HTC at 240℃ for 1 hour.Increased reaction temperatures and longer reaction times led to reduced hydrochar yield due to enhanced dehydration and decarboxylation reactions.The H/C and O/C atomic ratios gradually decreased as a result.Furthermore,the regular and compact structure of sludge was disrupted to varying degrees following HTC treatment,resulting in the formation of holes and grooves that increased the specific surface area,pore volume,and pore size of the hydrochar produced.Specifically,hydrochar obtained from HTC at 220℃ for 1 hour exhibited the highest specific surface area (129.98 m2/g) and pore volume (0.66 cm3/g).The composition and crystalline structure of hydrochar were primarily influenced by factors such as reaction medium > reaction temperature > reaction time.With the increase of HTC reaction temperature and residence time,the volatile content of hydrochar decreased while the fixed carbon and ash content increased.The main exothermic range during combustion of hydrochar occured between 250-550℃.关键词
城市污泥/水热碳化/水热炭/污泥处理Key words
sewage sludge/hydrothermal carbonization (HTC)/hydrochar/sludge treatment引用本文复制引用
王航,刘阳生,王殿常,陈祥,刘枫,乔雪园,李锟,王先恺..城市污泥水热碳化影响因素研究[J].北京大学学报（自然科学版）,2024,60(4):745-757,13.基金项目
国家重点研发计划(2020YFC1908700)和中国长江三峡集团有限公司科研项目(NBWL202300013,NBWL202300014)资助 （2020YFC1908700）
