[Effect of bio-charcoal on the trans of polycyclic aromatic hydrocarbons in soil-plant system with composted sludge application].
The effects of bio-charcoal acted as sludge-composting additive on soil characteristics and plant growth were studied. Compared with the treatment of composted sludge without bio-charcoal, soil cation exchange capacity in treatment of composted sludge with bio-charcoal increased over 5% and 10% respectively and soil nitrogen content increased 13% and 18% respectively for two kind soils. The composted sludge with bio-charcoal also resulted in 23% higher enhancement on ryegrass biomass and 8%-10% higher enhancement on ryegrass chlorophyll content. In addition, with the amendment of bio-charcoal, the bioavailability of polycyclic aromatic hydrocarbons (PAHs) in composted sludge was decreased, which resulted in the lower absorption and accumulation of ryegrass to PAHs. Compared with the control, the PAHs concentration in ryegrass amended composted sludge with bio-charcoal decreased 27%-34%. The results indicated that composted sludge with bio-charcoal resulted in much more improvement on the plant growth as well as less negative effect on environment. Therefore, biocharcoal was in favor of the safe land application of sewage sludge.
Hua
Li
L
College of Resource and Environment, Shannxi University of Science and Technology, Xi'an 710021, China. tiliphua@126.com
Chen
Ying-xu
YX
Wu
Wei-xiang
WX
Ma
Hong-rui
HR
D002606:Charcoal / Q000737:chemistry*; D003247:Conservation of Natural Resources; D005308:Fertilizers; D009584:Nitrogen / Q000032:analysis; D006109:Poaceae / Q000254:growth & development*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000378:metabolism*; D012037:Refuse Disposal / Q000379:methods*; D012722:Sewage / Q000737:chemistry*; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis / Q000378:metabolism
D005308:Fertilizers; D011084:Polycyclic Aromatic Hydrocarbons; D012722:Sewage; D012987:Soil; D012989:Soil Pollutants; D002606:Charcoal; D009584:Nitrogen