Adsorbent supplemented biological treatment of pre-treated landfill leachate by fed-batch operation


KARGI F., Pamukoglu M. Y.

BIORESOURCE TECHNOLOGY, vol.94, no.3, pp.285-291, 2004 (Peer-Reviewed Journal) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 94 Issue: 3
  • Publication Date: 2004
  • Doi Number: 10.1016/j.biortech.2004.01.003
  • Journal Name: BIORESOURCE TECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.285-291
  • Keywords: adsorption, biological treatment, fed-batch operation, landfill leachate, HIGH AMMONIA LEACHATE, SEQUENCING BATCH, CHEMICAL PRECIPITATION, REMOVAL, NITROGEN, OXIDATION, REACTORS, CARBON, EFFICIENCY, STRENGTH

Abstract

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 NH4-N removal performances of powdered activated carbon (PAC) and powdered zeolite (PZ) were compared during biological treatment. Adsorbent concentrations varied between 0 and 5 g l(-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 g l(-1), respectively. Ammonium-N removals were 30% and 40% with PAC and zeolite concentrations of 5 g l(-1), respectively at the end of 30 h of fed-batch operation. (C) 2004 Elsevier Ltd. All rights reserved.