Chlorine disinfection of grey water for reuse: Effect of organics and particles

Adequate disinfection of grey water prior to reuse is important to prevent the potential transmission of disease-causing microorganisms. Chlorine is a widely utilised disinfectant and as such is a leading contender for disinfection of grey water intended for reuse. This study examined the impact of...

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Bibliographic Details
Published in:Water research (Oxford) 2008, Vol.42 (1), p.483-491
Main Authors: Winward, Gideon P., Avery, Lisa M., Stephenson, Tom, Jefferson, Bruce
Format: Article
Language:English
Subjects:
Applied sciences
chlorination
Chlorine
Chlorine - chemistry
Coliform
coliform bacteria
Colony Count, Microbial
Conservation of Natural Resources - methods
cost effectiveness
Disinfectants - chemistry
Disinfection
Enterobacteriaceae - isolation & purification
Exact sciences and technology
Grey water
microbial contamination
microorganisms
organic compounds
Organics
Other industrial wastes. Sewage sludge
Particle Size
Particles
Pollution
solids
United Kingdom
Waste Disposal, Fluid - methods
Wastes
wastewater treatment
Water Pollutants - analysis
water reuse
Water treatment and pollution
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Summary:Adequate disinfection of grey water prior to reuse is important to prevent the potential transmission of disease-causing microorganisms. Chlorine is a widely utilised disinfectant and as such is a leading contender for disinfection of grey water intended for reuse. This study examined the impact of organics and particles on chlorine disinfection of grey water, measured by total coliform inactivation. The efficacy of disinfection was most closely linked with particle size. Larger particles shielded total coliforms from inactivation and disinfection efficacy decreased with increasing particle size. Blending to extract particle-associated coliforms (PACs) following chlorine disinfection revealed that up to 91% of total coliforms in chlorinated grey water were particle associated. The organic concentration of grey water affected chlorine demand but did not influence the disinfection resistance of total coliforms when a free chlorine residual was maintained. Implications for urban water reuse are discussed and it is recommended that greywater treatment systems target suspended solids removal to ensure removal of PACs prior to disinfection.
ISSN:0043-1354
1879-2448
DOI:10.1016/j.watres.2007.07.042