%0 Journal Article
%T Dynamics of SO2 absorption by sewage sludge during drying<br>接触式污泥干化过程中SO2吸收率的动态变化
%A WENG Huanxin
%A FENG Xi
%A SU Minhu
%A ZHANG Jinjun
%A MA Xuewen
%A <br>翁焕新
%A 冯曦
%A 苏闽华
%A 章金骏
%A 马学文
%J 环境科学学报
%D 2010
%I 
%X Using the actual operating parameters of a contact-type sludge drying process, a simulation was conducted to study the dynamics of absorption of suffur dioxide (SO_2) from flue gas by sewage sludge during drying. The factors and causes leading to changes in the absorption rate were analyzed. The results show that the SO_2 absorptian rate decreased with increasing temperature and airflow. At 80℃, the SO_2 absorption rates of sludge with moisture contents of 55% and 75% , were 16.0% and 25.0% respectively. These rates were reduced to 6.0% and 7.0% , respectively, at 160℃. Absorption of SO2 by sludge occurs when SO_2 gas diffuses from the gas phase to the gas-liquid interlace, so elevating the drying temperature and increasing the airflow accelerate the evaporation of sludge water, thus hampering the process and causing the SO_2 absorption rate to drop. Increase of the SO_2 concentration in the flue gas had no obvious effect on SO_2 absorption rate. After absorption of SO_2 , the pH of the sludge dropped, indicating that acidic reactions had occurred. Infrared analysis of the sludge shows that absorption of SO2 by sludge is a chemical absorption process.
%K SO_2
%K sludge drying
%K SO_2
%K absorption
%K dynamic change<br>污泥干化
%K SO2
%K 吸收率
%K 动态变化
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=03A55E61A8750ACAC6AF81EF9E2AC838&aid=C7F84083F5526FDC402CF29BF5C35B78&yid=140ECF96957D60B2&vid=340AC2BF8E7AB4FD&iid=0B39A22176CE99FB&sid=869B6F3117981EC4&eid=5F8BAECF36EB55E2&journal_id=0253-2468&journal_name=环境科学学报&referenced_num=1&reference_num=0