Denitrification capacity of bioreactors filled with refuse at different landfill ages.
The denitrification capacity of refuse at different landfill ages in bioreactor landfill system was studied. Three reactors filled with 1-year-old refuse (R1), 6-year-old refuse (R6) and 11-year-old refuse (R11), respectively, were operated in the experiment. Nitrate solution (1000 mg NO3(-)-NL(-1)) was added into each reactor. The results showed that the reactors were all able to consume nitrate. However, 1-year-old refuse in R1 had both a higher nitrate reduction rate and concentration of N2. In addition, vertical differences in nitrate removal along the depth of R1 were observed. The bottom-layer refuse and the middle-layer refuse both showed higher efficiency in nitrate depletion than the top layer. Furthermore, N2O accumulation was found in R11 with the concentration up to 19.3% of the released gas. These results suggested that 1-year-old refuse, which was partly degraded, was more suitable to use as denitrification medium.
Chen
Ying-xu
YX
Ministry of Agriculture Key Laboratory of Non-point Source Pollution Control, Hangzhou 310029, PR China. yxchen@zju.edu.cn
Wu
Song-wei
SW
Wu
Wei-xiang
WX
Sun
Hua
H
Ding
Ying
Y
D000641:Ammonia / Q000302:isolation & purification; D001673:Biodegradation, Environmental; D019149:Bioreactors; D003198:Computer Simulation; D004867:Equipment Design; D005740:Gases; D006863:Hydrogen-Ion Concentration; D008956:Models, Chemical; D009566:Nitrates / Q000032:analysis / Q000737:chemistry / Q000378:metabolism; D009584:Nitrogen / Q000032:analysis; D010100:Oxygen / Q000737:chemistry; D012037:Refuse Disposal / Q000379:methods*; D012989:Soil Pollutants / Q000032:analysis; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods
D005740:Gases; D009566:Nitrates; D012989:Soil Pollutants; D000641:Ammonia; D009584:Nitrogen; D010100:Oxygen