摘要
应对农业固废利用率低及过度施肥带来的环境问题,以4种常见农业固废(花生壳,PS;瓜子壳,SS;稻壳,RH;甘蔗渣,BA)为材料,研究300、450和600℃热解制备的生物质炭对水体中铵态氮吸附效果。结果显示,等温吸附Freundlich模型相比Langmuir模型具有更好相关性,更加适合描述12种生物质炭对铵态氮吸附过程。BA300(K=0.54)的吸附能力最强,RH450(K=0.01)的吸附能力最弱。在1%、3%和5%(质量分数)施用量下,土壤对铵态氮的平衡吸附量随生物质炭投加量的增加而增大。结果表明,生物质炭的施加可以改变土壤理化性质,促进土壤对铵态氮的固持能力。
The overuse of fertilizers and the limited reuse of agro-byproducts cause various environmental problems. Four agro-byproducts, namely, peanut shell （PS） , sunflower seeds （SS） , rice hull （RH） , and ba- gasse （BS） were chosen to produce biochar at different temperatures （300, 450, and 600 ℃ ）. The effects of these biochars on the adsorption of ammonia nitrogen were investigated. The results indicated that using the Fre- undlich model was more suitable to describe the adsorption process of 12 agro-biochars （ABCs） on ammonia ni- trogen than was the Langmuir model. Among the 12 ABCs, BA300 （K = 0.54） had the largest adsorption abili- ty, whereas that of RH450 （K = 0.01 ） was the lowest. Moreover, the adsorption capacity of the soil on ammonia nitrogen increased by enlarging the biochar amount of 1% , 3% , and 5%. This study demonstrates that ABCs can change the physicochemical properties of soil, enhancing the adsorption capacity of soils on ammonia nitrogen.
出处
《环境工程学报》
CAS
CSCD
北大核心
2016年第9期5165-5171,共7页
Chinese Journal of Environmental Engineering
基金
华东交通大学博士科研启动基金(26441028)
江西省科技支撑计划项目(20123BDH80014)
关键词
农业固废
生物质炭
铵态氮
吸附等温线
agro-byproduct
biochar
ammonium nitrogen
adsorption isotherm
