Biochar as adsorbent in purification of clear-cut forest runoff water:adsorption rate and adsorption capacity  

作　　者：Taija Saarela Elham Kakaei Lafdani Ari Laurén Jukka Pumpanen Marjo Palviainen 

机构地区：[1]Department of Environmental and Biological Sciences,University of Eastern Finland,Yliopistonranta 1 E,FI-70210 Kuopio,Finland [2]School of Forest Sciences,University of Eastern Finland,Yliopistokatu 7,FI-80101 Joensuu,Finland [3]Department of Forest Sciences,University of Helsinki,Latokartanonkaari 7,FI-00014 Helsinki,Finland

出　　处：《Biochar》2020年第2期227-237,共11页生物炭（英文）

基　　金：Open access funding provided by University of Eastern Finland(UEF)including Kuopio University Hospital.This study was funded by Marjatta and Eino Kolli Foundation,the Academy of Finland(funding decisions 311925 and 326818);the Academy of Finland Centre of Excellence(project no.307331)and Doctoral Programme in Environmental Physics,Health and Biology(University of Eastern Finland).

摘　　要：Forest management practices in boreal peatlands increase nutrient export and suspended solids to watercourses calling for development of new water protection methods.One potential solution could be adsorption-based purification of runoff water using biochar.The aim of this study was to determine the adsorption rate and capacity for Norway spruce and silver birch biochars to design a biochar-filled reactor for a ditch drain.In a 10-day laboratory experiment,biochar was stirred with runoff water from a clear-cut peatland forest,and changes in water pH,total nitrogen,nitrate nitrogen,ammonium nitrogen,phosphorus,and total organic carbon concentrations were measured.Based on the concentration changes,adsorption was quantified and adsorption model containing the adsorption rate and capacity was fitted to the data.Our results indicate that biochar effectively adsorbs both inorganic and organic nitrogen from runoff water.Birch biochar had higher adsorption capacity of nitrogen than spruce biochar.This study demonstrates that the adsorption of nitrogen compounds onto biochar surfaces increases with increasing initial concentrations.Thus,aquatic ecosystems exposed to high nutrient loads from fertile peatlands would particularly benefit from biochar-based water purification.

关 键 词：Adsorption AMMONIUM BIOCHAR NITRATE NUTRIENTS Total nitrogen Water quality 

分 类 号：O64[理学—物理化学]