Abstract

A new method of ultraviolet light (UV) activated persulfate (PS) oxidation was investigated to regenerate granular activated carbon (GAC) in drinking water applications. The improvements in iodine and methylene blue numbers measured in the GAC after ultraviolet- (UV) activated persulfate suggested that the GAC preloaded with natural organic matter (NOM) was chemically regenerated. An experimental matrix for UV-activated persulfate regeneration included a range of persulfate doses and different UV wavelengths. Over 87% of the initial iodine number for GAC was restored under the optimum conditions, perfulfate dosage 60g/L and UV exposure 1.75×104mJ/cm2. The persulfate dosages had little effect on the recovery of the methylene blue number, which was approximately 65%. Persulfate activation at 185nm was superior to activation at 254nm. UV activation of persulfate in the presence of GAC produced acid, lowering the solution pH. Higher persulfate concentrations and UV exposure resulted in greater GAC regeneration. Typical organic and inorganic byproducts (e.g., benzene compounds and sulfate ions) were measured as a component of treated water quality safety. This study provides a proof-of-concept that can be used to optimize pilot-scale and full-scale UV-activated persulfate for regeneration of NOM-saturated GAC.

Original languageEnglish (US)
Pages (from-to)304-310
Number of pages7
JournalWater Research
Volume73
DOIs
StatePublished - Apr 5 2015

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Activated carbon
Biological materials
activated carbon
regeneration
oxidation
organic matter
Oxidation
Chemical activation
iodine
Iodine
Ultraviolet Rays
Potable water
benzene
Dosimetry
Water quality
Byproducts
Benzene
drinking water
safety
sulfate

Keywords

  • Granular activated carbon
  • Persulfate
  • Regeneration
  • Ultraviolet

ASJC Scopus subject areas

  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Ecological Modeling

Cite this

UV-activated persulfate oxidation and regeneration of NOM-Saturated granular activated carbon. / An, Dong; Westerhoff, Paul; Zheng, Mengxin; Wu, Mengyuan; Yang, Yu; Chiu, Chao An.

In: Water Research, Vol. 73, 05.04.2015, p. 304-310.

Research output: Contribution to journalArticle

An, Dong ; Westerhoff, Paul ; Zheng, Mengxin ; Wu, Mengyuan ; Yang, Yu ; Chiu, Chao An. / UV-activated persulfate oxidation and regeneration of NOM-Saturated granular activated carbon. In: Water Research. 2015 ; Vol. 73. pp. 304-310.
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AU - Westerhoff, Paul

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AU - Yang, Yu

AU - Chiu, Chao An

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