NDLI: Photocatalytic decomposition of nonbiodegradable substances in wastewater from an acrylic fibre manufacturing process

Content Provider	Springer Nature Link
Author	Na, Young Soo Lee, Chang Han Lee, Tae Kyung Lee, Song Woo Park, Young Seek Oh, You Kwan Park, Sung Hoon Song, Seung Koo
Copyright Year	2005
Abstract	The testing samples in this experiment were obtained from an acrylic fibre manufacturing companys industrial wastewater. The water was the waste of the acrylic polymerization process. The company is located in Ulsan, Korea. The concentration of acrylonitrile (AN) in the wastewater was about 25–35 mg/L. Concentrations of 3–10 mg/ L of methyl acrylate (M-35) were also found. The samples were treated by the TiO$_{2}$/UV system and were analyzed to determine the values of COD$_{cr}$, ammonia, nitrite nitrogen, and nitrate nitrogen by using an Auto Analyzer (Bran+ Luebbe, Germany) and a TOC (Tekmar Dohrmann, USA). Various reaction parameters, such as TiO$_{2}$ content, light intensity and wavelength, and the number of UV lamps were varied and their effects or decomposition efficiency were analyzed. The adsorption onto TiO$_{2}$ surfaces by organic materials in the wastewater was negligible. The reaction-rate constant was also calculated. The reaction rate constant for the G36T6L lamp at both 185 nm and 256 nm was 0.0661 hr$^{-1}$ which is 1.3 times higher than that of the TUV36T5 lamp at 256 nm. While the reaction rate was increased by increasing the surface area of the photocatalyst, the excess photocatalyst blocked the light sources, causing a photoenclosure effect. The stability of the treated wastewater was greatly increased because the elimination of the concentration of nitrite was followed by an increase in the concentration of nitrate. Generally, the ratio of BOD$_{5}$/COD$_{cr}$ is used as the criterion for determining biodegradability. A ratio of 0.3 is needed for biological degradation. The ratio of the treated wastewater increased to 0.5 after 12 hours of reaction. The ratio increased to 0.8 after 20 hours.
Starting Page	246
Ending Page	249
Page Count	4
File Format	PDF
ISSN	02561115
Journal	Korean Journal of Chemical Engineering
Volume Number	22
Issue Number	2
e-ISSN	19757220
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Acrylonitrile BOD/COD$_{cr}$ Ratio Industrial Wastewater Photocatalytic Reaction TiO$_{2}$/UV Industrial Chemistry/Chemical Engineering Catalysis Materials Science Biotechnology
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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