改性粉煤灰对沼液中氨氮吸附动力学研究  

ADSORPTION KINETICS STUDY OF AMMONIA-NITROGEN FROM BIOGAS SLURRY ON MODIFIED FLY ASH

作　　者：袁基刚[1] 刘兴勇[1] 王成端[1] 李敏[1] 

机构地区：[1]四川理工学院材料与化学工程学院,四川自贡643000

出　　处：《环境工程》2013年第6期16-19,共4页Environmental Engineering

基　　金：“水体污染控制与治理”国家重大专项(2012ZX07301-001);四川省教育厅重点项目(11ZA122,12ZA264);四川理工学院科研培育项目(2011xj027);四川理工学院学科建设工程项目

摘　　要：采用自制的改性粉煤灰为吸附材料,对沼液中氨氮进行吸附动力学研究。考察了沼液pH值、吸附时间和吸附剂投加量对吸附过程的影响。研究表明:在pH为7.0,吸附时间为30 min,改性粉煤灰的投加量为0.013 g/mL时,吸附效果较好。此吸附过程可用二级吸附动力学方程较好地描述,该过程的吸附速率主要受液膜扩散过程的阻力影响。Abstraetl The adSorption dynamics of ammonia nitrogen from biogas slurry was investigated using self-made modified fly ash as absorbent, and some effect factors of the adsorption process such as pH, contact time and the dose of adsorbent were investigated. Experimental results showed that the optimal adsorption conditions for removal efficiency of ammonia nitrogen from biogas.slurry were that pH was 7. O, contact time was 30 min and the dose of adsorbent was 0. 013 g/mL. The adsorption process could be better described by the pseudo-second-order model than the pseudo-first-order model, and it was mainly controlled by the resistance of liquid film diffusion.

关 键 词：改性粉煤灰 沼液 氨氮 吸附动力学 

分 类 号：X703[环境科学与工程—环境工程]