The Degradation Of Humic Substances Using Continuous Photocatalysis Systems
- Publisher:
- Marcel Dekker Inc
- Publication Type:
- Journal Article
- Citation:
- Areerachakul, N. et al. 2007 'The Degradation Of Humic Substances Using Continuous Photocatalysis Systems', Separation Science and Technology, vol. 43, no. 1, pp. 93-112.
- Issue Date:
- 2007
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Photocatalytic oxidation is an emerging technology in water and
wastewater treatment. Photocatalysis often leads to complete degradation of
organic pollutants without the need for chemicals. This study investigated the degradation
of humic substances in water using photocatalysis systems coupled with
physio-chemical processes such as adsorption and/or flocculation. Dissolved
Organic Carbon (DOC) removal of PAC-TiO2 was improved by a factor of two to
three times compared with TiO2 alone. Solid Phase Micro Extraction (SPME)/Gas
Chromatograph (GC) flame ionisation detector (FID) was used to investigate intermediates
of photocatalytic oxidation in a batch reactor with TiO2 alone and with
powder activated carbon (PAC) with TiO2. GC peaks showed that PAC-TiO2
adsorbed some by-products which were photo-resistant and prevented the reverse
reaction that occurred when TiO2 was used alone. The two other types of photocatalytic
reactors used were the continuous photocatalytic reactor and recirculated photocatalytic
reactor. The results show that the recirculated reactor had the highest
efficiency in removing organic matter in a short photo-oxidation (detention) time
of less than 10 min. The use of PAC-TiO2 in recirculated continuous reactor
resulted in 80% removal of organic matter even when it was operated for a short
detention time and allowed the use of a smaller dose of TiO2.
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