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Advanced Treatment Processes for the Removal of Cyanobacterial Toxins from Drinking Water

Objectives:  Lake Erie is as a source of drinking water for over 13 million people, with annual water use of approximately 2 billion gallons. In recent years, blooms of Microcystis algae have occurred that produce microcystin-LR, and other toxins, that have both acute and chronic effects in humans. Although no maximum contaminant level (MCL) has been set in the United States, the World Health Organization (WHO) has established a safe level of microcystin-LR in drinking water of 1 mg/L. Because conventional treatment processes are ineffective at removing microcystins, approaches for the removal of these toxins during drinking water treatment are needed. In this research, we will examine the use of powdered activated carbon-ultrafiltration (PAC-UF) for the removal of microcystin-LR during drinking water treatment. PAC-UF effectively removes pathogens, is less prone to fouling compared to nanofiltration, and recent studies indicate this technology can also remove trace organic contaminants. Despite the potential of PAC-UF, no research has been carried out examining the effectiveness of this technology for removing cyanobacterial toxins. The objectives of this research include   1) Determine the most effective PAC-UF process configurations for the removal of microcystins from drinking water 2) Examine the effect of pretreatment processes (i.e., coagulation, softening, anti-scalant addition) on microcystin removal by PAC-UF, and   3) mechanisms by which natural organic matter (NOM) influences the removal of microcystins by this advanced treatment process.

Status
In progress
Type
Project
Start Date
End Date
Scope of Study
Laboratory Investigation
Scale of Phenomena
Physical/Chemical
Impact of Pollutants
Toxic Organics
Lake Basin Connecting Channels
Lake Erie
State Province
Ohio
Annex Numbers
Hazardous Polluting Substances - lists
Specific Objectives for toxic substances and effluents
Surveillance and Monitoring
General
Annex
  • Annex Numbers
    Annex Numbers
    Hazardous Polluting Substances - lists
    Specific Objectives for toxic substances and effluents
    Surveillance and Monitoring
  • Annex 17

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