Most of that post was based on work undertaken at Duke University (USA) by Associate Professor Karl Linden and his research group.Now we are very fortunate to have the opportunity to learn more about this important topic from Karl as he visits the University of New South Wales to give a seminar. This is a free public seminar and all interested persons are welcome to attend.
Ultraviolet light: Beyond water disinfection
Associate Professor Karl G. Linden
Duke University, NC, USA
DATE: Wednesday, October 24 2007
TIME: 12-1pm
VENUE: Room 701, Civil & Environmental Engineering (Building H20), University of New South Wales.
ABSTRACT:
Although used in wastewater disinfection for years, ultraviolet light technology has only recently been seriously considered for drinking water treatment.
Because of its singularly high efficiency for inactivating protozoan pathogens, such as Cryptosporidium and Giardia, UV is now expected to be widely adopted for water treatment disinfection in the coming years.
But there is another side of UV not widely appreciated - that of contaminant remediation via photolysis and oxidation processes, specifically for water reuse.
UV mediated destruction of chemical contaminants is a very promising treatment process with interesting fundamental research opportunities and practical applications for indirect potable reuse.
This seminar will provide an overview of where UV technology for water treatment has been, and focus on the fundamentals of UV based remediation, drawing on our recent research findings for conventional and emerging environmental pollutants of concern in water including N-nitrosodimethylamine (NDMA), pharmaceuticals, and endocrine disrupters.
Some related recent Linden Group publications:
Chen, P.J., Kullman, S.W., Hinton, D., Linden, K.G. (2007) "Comparisons of Low- and Medium- Pressure UV lamps on the Removal of Bisphenol A Estrogenic Activity in Water following Direct Photolysis and UV/H2O2 Oxidation Processes" Chemosphere, Vo. 68, No. 6, 1041-1049.
Rosenfeldt, E.J., Linden, K.G., (2007) "Hydroxyl radical formation during the UV/H2O2 processes: The ROH/UV concept" Environmental Science and Technology. Vol. 41, No. 7, 2548-2553
Rosenfeldt, E.J., Chen, P.J., Kullman, S.W., Linden, K.G., (2007) "Destruction of estrogenic activity in water using UV advanced oxidation" Science of the Total Environment, Vol. 377, No. 1, 105-113.
Chen, P.J., Rosenfeldt, E.J., Kullman, S.W., Hinton, D., Linden, K.G. (2007) "Biological Assessments of a Mixture of Endocrine Disruptors at Environmentally Relevant Concentrations in Water following UV/H2O2 Oxidation" Science of the Total Environment, Vol. 376, No. 1-3, 18-26.
Shemer, H., Linden, K.G. (2007) "Aqueous photodegradation and toxicity of the polycyclic aromatic hydrocarbons fluorene, dibenzofuran and dibenzothiophene", Water Research, Vol. 41, No 4, 853-861.
Pereira, V.J., Weinberg, H.S., Linden, K.G., Singer, P.C. (2007) "UV degradation of pharmaceutical compounds in surface water via direct and indirect photolysis at 254 nm" Environmental Science and Technology Vol. 41, No 5, 1682-1688.
Wu, C., Shemer, H., Linden, K.G. (2007) "Photodegradation and Byproduct Formation of Metolachlor in Water via UV and UV/H2O2 Treatment" J. Agric. Food Chem. Vol. 55, No. 10, 4059-4065.
Shemer, H., Linden, K.G. (2006) "Photolysis, oxidation and subsequent toxicity of a mixture of polycyclic aromatic hydrocarbons in natural waters", Journal of Photochemistry and Photobiology A: Chemistry Vol. 187, No. 2-3, 186-195
Shemer, H., Sharpless, C.M., Elovitz, M.S., Linden, K.G. (2006) "Relative rate constants of contaminant candidate list pesticides with hydroxyl radicals" Environmental Science and Technology Vol. 40, 4460-4466
Chen, P.J., Linden, K.G., Hinton, D.E., Kashiwada, S., Rosenfeldt, E.J., Kullman, S.W. (2006) "Biological Assessments of Bisphenol A Degradation in Water following Direct Photolysis and UV Advanced Oxidation" Chemosphere Vol. 65, 1094-1102.
Shemer, H., Linden, K.G. (2006) "Degradation and byproduct formation of diazinon using UV and UV/H2O2 processes", Journal of Hazardous Materials Vol. 136, No. 3, 553-559
Shemer, H., Kunukcu, Y.K., Linden, K.G. (2006) "Degradation of the Pharmaceutical Metronidazole Via UV, Fenton and photo-Fenton Processes, Chemosphere Vol. 63, 269-276.
Rosenfeldt, E.J., Melcher, B., and Linden, K.G. (2005) "Treatment of Taste and Odor Causing Compounds in Water by UV and UV/H2O2 Processes", Journal of Water Supply: Research & Technology -AQUA Vol. 54, No. 7, 423-434.
Rosenfeldt, E.J. and Linden, K.G. (2004) "Degradation of endocrine disrupting chemicals bisphenol-A, ethinyl estradiol, and estradiol during UV photolysis and advanced oxidation processes" Environmental Science and Technology, Vol. 38 No. 20, 5476-5483
Sharpless, C.M. and Linden, K.G. (2003) "Experimental and Model Comparisons of Low- and Medium-Pressure Hg Lamps for the Direct and H2O2 Assisted UV Photodegradation of N-nitrosodimethylamine in Simulated Drinking Water", Environmental Science and Technology, Vol. 37 No. 9, pp. 1933-1940
6 comments:
Looks like an intersting seminar!
Maybe Snow Manners should go along and see if he can learn something. Or just snidely scoff at anything said...whatever is easiest for him...
Now, Now. Be nice...
We know who anonymous is and he's angry and frustrated that he didn't get his way and sense prevailed.
And what's up with the SEQ project - looks like noone will be drinking recycled water anytime soon!!
Hello Waterboy,
Yes, the SEQ scheme does appear to be suffering from a shortage of water to recycle. However, its worth remembering that one of the main reasons that we have dams is to store water from when its plentiful for when its not. In the short term, the scheme will make a huge contribution to saving water (at least 130 million litres per day, mainly used by the power stations) and in the longer term surpluses will contribute to maintaining storage levels to help get through the next drought.
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