Effects of alum on the quality of aquaculture effluents in settling ponds

Martha Rowan, Amit Gross, Claude E. Boyd

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The effectiveness of alum (aluminum sulfate) in reducing the concentrations of potential pollutants in pond effluents was investigated in catfish production ponds. Application of alum at 50 mg/l to water remaining in ponds immediately after seining for harvest did not generally result in significantly greater removal of nutrients and solids than did settling alone, although removal rates of some variables were initially higher in the alum treated ponds. Within four hours of seining in both alum treated and untreated ponds, there was removal of more than 85% of total suspended solids, 75% of total phosphorus, 72% of turbidity, and more than 40% of biochemical oxygen demand and chemical oxygen demand. Concentrations of soluble reactive phosphorus decreased after 48 h, but total ammonia nitrogen was not removed. Alum may be more effective in improving water quality in settling ponds if it is applied after the initial sedimentation has occurred.

Original languageEnglish
Pages (from-to)166-175
Number of pages10
JournalIsraeli Journal of Aquaculture - Bamidgeh
Issue number3
StatePublished - 1 Sep 2004


  • Alum
  • Pollutants
  • Settling ponds

ASJC Scopus subject areas

  • Aquatic Science
  • Agronomy and Crop Science


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