Ultraviolet (UV) disinfection of grey water: particle size effects
| Autor: | Bruce Jefferson, Tom Stephenson, Gideon P. Winward, Lisa M. Avery |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Sedimentation (water treatment)
Ultraviolet Rays medicine.disease_cause Waste Disposal Fluid Water Purification Settling Water Supply medicine Environmental Chemistry Water Pollutants Particle Size Waste Management and Disposal Water Science and Technology Sewage Chemistry Environmental engineering Water General Medicine Disinfection Oxygen Environmental chemistry Particle-size distribution Water treatment Water quality Particle size Water Microbiology Ultraviolet Water Pollutants Chemical Waste disposal Disinfectants |
| Zdroj: | Environmental technology. 29(2) |
| ISSN: | 0959-3330 |
| Popis: | The impact of water quality on the ultraviolet (UV) disinfection of grey water was investigated with reference to urban water reuse. Direct UV disinfection of grey water did not meet the stringent California State Title 22 criteria for unrestricted urban water reuse due to the presence of particulate material ranging from1 toor = 2000 microm in size. Grey water was manipulated by settling to produce fractions of varying particle size distributions and blending was employed post-disinfection to extract particle-associated coliforms (PACs). The efficacy of UV disinfection was found to be linked to the particle size of the grey water fractions. The larger particle size fractions with a mean particle size of 262 microm and above were observed to shield more coliforms from UV light than did the smaller particles with a mean particle size below 119 microm. Up to 70% of total coliforms in the larger particle size fractions were particle-associated following a UV dose (fluence) of 260 mJ.cm(-2) and would remain undetected by standard coliform enumeration techniques. Implications for urban water reuse are discussed and recommendations made for grey water treatment to ensure removal of particle-associated indicator bacteria and pathogens prior to UV disinfection. |
| Databáze: | OpenAIRE |
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