Algal purification of pretreated landfill leachate

L. M. CHU, K. C. CHEUNG, Ming Hung WONG

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2 Citations (Scopus)

Abstract

The efficiency of microalgae in removing various pollutants in landfill leachate after pretreatment by free stripping or air stripping was tested by a laboratory batch system. The results showed that Chlorella pyrenoidosa and Scenedesmus sp. had similar removal efficiencies with regard to ammoniacal-nitrogen, oxidized-nitrogen, orthophosphate and chemical oxygen demand (COD). The COD removal by algal treatment was better in Junk Bay (JB) leachate than in Gin Drinkers' Bay (GDB) leachate (14-21% and 0.4-7% respectively). No significant difference (P > 0.05) was found in removing other nutrients including ammoniacal-nitrogen, oxidized-nitrogen and orthophosphate between leachate from the two landfills, regardless of the pretreatment used. The removal efficiencies of ammoniacal-nitrogen and phosphorus were found to be higher in air-stripped leachate than in free-stripped one. Removal of ammoniacal-nitrogen and phosphorus in air-stripped leachate was 30% and 87% respectively. Poor removal of ammoniacal-nitrogen was probably due to a deficiency in phosphorus (high N : P ratio) for algal growth in leachate. The two-stage leachate treatment (ammonia stripping followed by algal purification) resulted in overall reduction of COD (38-51%), ammoniacal-nitrogen (72-96%) and orthophosphate (79-96%). Copyright © 1996 Informa UK Limited.

Original languageEnglish
Pages (from-to)159-174
JournalToxicological and Environmental Chemistry
Volume53
Issue number1-4
DOIs
Publication statusPublished - Jan 1996

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Chemical Water Pollutants
Land fill
Purification
purification
Nitrogen
leachate
nitrogen
Biological Oxygen Demand Analysis
Chemical oxygen demand
orthophosphate
chemical oxygen demand
Phosphorus
Phosphates
Air
phosphorus
air
Leachate treatment
Scenedesmus
Microalgae
Chlorella

Citation

Chu, L. M., Cheung, K. C., & Wong, M. H. (1996). Algal purification of pretreated landfill leachate. Toxicological & Environmental Chemistry, 53(1-4), 159-174. doi: 10.1080/02772249609358281

Keywords

  • Landfill leachate
  • Microalgal purification
  • Chlorella
  • Scenedesmus
  • Ammonia stripping
  • Ammoniacal‐nitrogen
  • COD