Chlorination for control of biological activity during direct recharge of tertiary effluent

Peter Fox, L. Wang, P. C. Johnson, Sandra Houston, W. N. Houston, P. Brown

Research output: Contribution to journalConference article

3 Scopus citations

Abstract

Chlorination for the control of biological activity during direct recharge of tertiary effluent was studied in bench-scale simulated aquifers. Both free chlorine and chloramine were studied at Darcy velocities of 360 cm/d to 720 cm/d. A free chlorine residual of 5 mg/l or above inhibited biological activity in the 1.2 m of soil that was studied. A free chlorine residual concentration of 2 mg/l prevented biological activity in the first 0.9 m of exposed soil and significant biological clogging was observed in soil greater than 0.9 m from the injection point. A 2 mg/L residual concentration of free chlorine prevented biological clogging over the 0.9 m of soil adjacent to the injection point. No chlorine addition resulted in clogging adjacent to the injection point indicating that the chloramine inhibited biological activity and allowed biological activity to occur over a greater distance from the injection point. Dissolved oxygen levels decreased to zero in aquifers where significant biological activity was observed and trihalomethane concentrations decreased in these aquifers. Free chlorine appears to effectively control biological clogging adjacent to the injection point while permitting biological activity to develop after the chlorine has decayed to a level of 0.6 mg/l or less.

Original languageEnglish (US)
Pages (from-to)55-62
Number of pages8
JournalWater Science and Technology
Volume38
Issue number6 pt 5
DOIs
StatePublished - Jan 1 1998
EventProceedings of the 1998 19th Biennial Conference of the International Association on Water Quality. Part 5 (of 10) - Vancouver, Can
Duration: Jun 21 1998Jun 26 1998

Keywords

  • Chlorination
  • Hydraulic conductivity
  • Oxygen
  • Tertiary effluent

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

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