Advanced treatment of landfill leachate by a new combination process in a full-scale plant.
Advanced treatment of mature landfill leachate from a municipal landfill located in southern China (Jiangmen) was carried out in a full-scale plant using a new process. The combined process has a sequencing batch reactor (SBR) serving as the primary treatment, with polyferric sulfate (PFS) coagulation coupled with a Fenton system as secondary treatment, and a pair of upflow biological aerated filters (UBAFs) in parallel as tertiary treatment. The overall removal efficiency of chemical oxygen demand (COD) in this process was 97.3%, with an effluent COD less than 100 mg/L. Up to 99% ammonia (N-NH3) removal efficiency was achieved in the SBR, with an effluent of less than 3 mg/L, which meets the discharge standard (< or =25 mg/L) with only primary treatment. The total phosphorus (TP) and suspended solids (SS) in the final effluent were reduced to less than 1 mg/L and 10 mg/L, respectively. The experience gained in the operation and maintenance will lead to a more stable performance of this combined process. An economic analysis shows that the overall operating cost of the advanced treatment was $2.70/m(3). This new combination process was proved to be highly compatible and efficient in a small-scale landfill leachate treatment plant and is recommended for small-scale landfill leachate treatment plants.
Li
Huo-Sheng
HS
College of Environmental Science and Engineering, South China University of Technology, Guangzhou Higher Education Mega Center 510006, PR China.
Zhou
Shao-Qi
SQ
Sun
Yan-Bo
YB
Feng
Ping
P
Li
Jing-da
JD
D000332:Aerobiosis; D000641:Ammonia / Q000737:chemistry; D001673:Biodegradation, Environmental; D019149:Bioreactors; D002681:China; D004867:Equipment Design; D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D010758:Phosphorus / Q000737:chemistry; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D012037:Refuse Disposal / Q000191:economics / Q000379:methods*; D013431:Sulfates / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D018508:Water Purification / Q000191:economics / Q000379:methods*
C045076:Fenton's reagent; D000644:Quaternary Ammonium Compounds; D013431:Sulfates; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D000641:Ammonia; D006861:Hydrogen Peroxide; D007501:Iron; D010100:Oxygen