TY - JOUR
T1 - Biological nutrient removal from leachate using a pilot liquid-solid circulating fluidized bed bioreactor (LSCFB)
AU - Eldyasti, Ahmed
AU - Chowdhury, Nabin
AU - Nakhla, George
AU - Zhu, Jesse
N1 - Funding Information:
The authors gratefully acknowledge Trojan Technologies, Canada, Natural Science and Engineering Research Council of Canada (NSERC), Ontario Center of Excellence (OCE), Canada, and City of London, ON, Canada for their endless support and interest at every stage of this research project.
PY - 2010/9
Y1 - 2010/9
N2 - Biological treatment of landfill leachate is a concern due to toxicity, high ammonia, low biodegradable organic matter concentrations, and low carbon-to-nitrogen ratio. To study the reliability and commercial viability of leachate treatment using an integrated liquid-solid circulating fluidized bed bioreactor (LSCFB), a pilot-scale LSCFB was established at the Adelaide Pollution Control Plant, London, Ontario, Canada. Anoxic and aerobic columns were used to optimize carbon and nutrient removal capability from leachate using 600μm lava rock with a total porosity of 61%, at empty bed contact times (EBCTs) of 0.55, 0.49, and 0.41d. The LSCFB achieved COD, nitrogen, and phosphorus removal efficiencies of 85%, 80%, and 70%, respectively at a low carbon-to-nitrogen ratio of 3:1 and nutrients loading rates of 2.15kgCOD/(m3d), 0.70kgN/(m3d), and 0.014kgP/(m3d), as compared with 60-77% COD and 70-79% nitrogen removal efficiencies achieved by upflow anaerobic sludge blanket (UASB) and moving bed bioreactor (MBBR), respectively. The LSCFB effluent characterized by ≤35mgSBOD/L, <35mgNH4-N/L, <1.0mgPO4-P/L, and 37mgVSS/L can easily meet sewer by-law requirements. Remarkably low yields of 0.13, 0.15, and 0.16gVSS/g COD were observed at long biological solids retention times (SRTs) of 31, 38 and 44d.
AB - Biological treatment of landfill leachate is a concern due to toxicity, high ammonia, low biodegradable organic matter concentrations, and low carbon-to-nitrogen ratio. To study the reliability and commercial viability of leachate treatment using an integrated liquid-solid circulating fluidized bed bioreactor (LSCFB), a pilot-scale LSCFB was established at the Adelaide Pollution Control Plant, London, Ontario, Canada. Anoxic and aerobic columns were used to optimize carbon and nutrient removal capability from leachate using 600μm lava rock with a total porosity of 61%, at empty bed contact times (EBCTs) of 0.55, 0.49, and 0.41d. The LSCFB achieved COD, nitrogen, and phosphorus removal efficiencies of 85%, 80%, and 70%, respectively at a low carbon-to-nitrogen ratio of 3:1 and nutrients loading rates of 2.15kgCOD/(m3d), 0.70kgN/(m3d), and 0.014kgP/(m3d), as compared with 60-77% COD and 70-79% nitrogen removal efficiencies achieved by upflow anaerobic sludge blanket (UASB) and moving bed bioreactor (MBBR), respectively. The LSCFB effluent characterized by ≤35mgSBOD/L, <35mgNH4-N/L, <1.0mgPO4-P/L, and 37mgVSS/L can easily meet sewer by-law requirements. Remarkably low yields of 0.13, 0.15, and 0.16gVSS/g COD were observed at long biological solids retention times (SRTs) of 31, 38 and 44d.
KW - Biomass yield
KW - Denitrification
KW - Landfill leachate
KW - Liquid-solid circulating fluidized bed
KW - Nitrification
UR - http://www.scopus.com/inward/record.url?scp=77954536273&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2010.05.010
DO - 10.1016/j.jhazmat.2010.05.010
M3 - Article
C2 - 20510504
AN - SCOPUS:77954536273
SN - 0304-3894
VL - 181
SP - 289
EP - 297
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 1-3
ER -
