Photocatalytic Treatment of Waste Water from Rice Husk Alkaline Hydrolysate
Received date: 2018-08-12
Accepted date: 2018-10-29
Online published: 2019-04-04
We carried out photocatalytic treatment of a lignin-free solution of rice husk alkaline hydrolysate [pH of 2, chemical oxygen demand (COD) of 12.8 g/L] using photo-Fenton process in the ultraviolet (UV, wavelength of 365 nm) and visible spectrum. Oxidation of lignin was performed at a constant mass ratio of COD:H2O2 as 1:2 and Fe2+ concentration of 80 mg/L. It was established that for the destruction of alkaline lignin, exposure to visible or UV radiation was necessary. Decolorization efficiency of a lignin-free solution depends on the dilution rate of the solution. The advanced oxidative photo-Fenton process (UV/Н2О2/Fe2+) made it possible to reduce the color of lignin-free solution at a dilution ratio of 1:5 by 94% of decolorization efficiency, 87% of phenolic compound and 79% of COD. With the help of gas chromatography, the products of lignin destruction were low-toxic and usable.
D. Arefieva Olga, S. Vasilyeva Marina, V. Ermolenko Ekaterina, V. Bychkova Anastasiia . Photocatalytic Treatment of Waste Water from Rice Husk Alkaline Hydrolysate[J]. Rice Science, 2019 , 26(4) : 257 -260 . DOI: 10.1016/j.rsci.2018.10.008
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