Adsorbent supplemented biological treatment of pre-treated landfill leachate by fed-batch operation.
Biological treatment of landfill leachate usually results in low COD removals because of high chemical oxygen demand (COD), high ammonium-N content and presence of toxic compounds. Coagulation-flocculation with lime addition and air stripping of ammonia were used as pre-treatment in this study in order to improve biological treatability of the leachate. Pre-treated leachate was subjected to adsorbent supplemented biological treatment in an aeration tank operated in fed-batch mode. COD and NH(4)-N removal performances of powdered activated carbon (PAC) and powdered zeolite (PZ) were compared during biological treatment. Adsorbent concentrations varied between 0 and 5 gl(-1). Percent COD and ammonium-N removals increased with increasing adsorbent concentrations. Percent COD removals with PAC addition were significantly higher than those obtained with the zeolite. However, zeolite performed better than the PAC in ammonium-N removal from the leachate. Nearly 87% and 77% COD removals were achieved with PAC and zeolite concentrations of 2 gl(-1), respectively. Ammonium-N removals were 30% and 40% with PAC and zeolite concentrations of 5 gl(-1), respectively at the end of 30 h of fed-batch operation.
Kargi
Fikret
F
Department of Environmental Engineering, Dokuz Eylul University, Buca, Izmir, Turkey. fikret.kargi@deu.edu.tr
Pamukoglu
M Yunus
MY
D000327:Adsorption; D000641:Ammonia / Q000378:metabolism; D001420:Bacteria, Aerobic / Q000378:metabolism*; D001673:Biodegradation, Environmental; D017610:Calcium Compounds; D002244:Carbon / Q000378:metabolism; D005427:Flocculation; D010087:Oxides; D010100:Oxygen / Q000378:metabolism; D012037:Refuse Disposal; D012722:Sewage / Q000382:microbiology; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D017641:Zeolites / Q000378:metabolism
D017610:Calcium Compounds; D010087:Oxides; D012722:Sewage; D014874:Water Pollutants, Chemical; D017641:Zeolites; D002244:Carbon; D000641:Ammonia; C016538:lime; D010100:Oxygen