Reclamation of polluted riverwater for aquaculture: Removal of nutrients by microalga

Ming Hung WONG*, Y. H. Cheung, S. F. Leung, P. S. Wong

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

5 Citations (Scopus)


The present experiment was designed to simulate an on-going field trial at Au Tau Substation, Agriculture and Fisheries Department, Hong Kong Government, using a series of fishponds to treat polluted riverwater, as well as for promoting algal growth, before the water was used for rearing freshwater fish. It was revealed that aeration was necessary to lower the level of ammonia. It also accelerated the conversion of ammonia to nitrite, and then nitrite to nitrate. Substantial amounts of metal (K, Mg, Cu, Zn) were also removed from the riverwater, possibly by algal assimilation. The algal products contained a high crude protein content (42% dry weight basis) which could be used to feed carp and tilapia.

Original languageEnglish
Pages (from-to)271-280
Number of pages10
JournalWater Science and Technology
Issue number3
Publication statusPublished - 1995

Scopus Subject Areas

  • Environmental Engineering
  • Water Science and Technology

User-Defined Keywords

  • Algal growth
  • nutrient removal
  • wastewater treatment
  • water quality


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