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环境科学学报 2007
Dyestuff wastewater treatment by combined photocatalysis and SBR
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Abstract:
TiO2 photocatalysts and SBR combined technology were applied to treat dyestuff wastewater. The catalyst was a polyhedral ball of polypropylene to which TiO2 was chemically coupled. In the photocatalytic stage, an orthogonal experiment was designed to address different factors such as dosages of photocatalyst, pH values, and DO values of the wastewater. The experimental results show that the optimal operating parameters for photocatalytic treatment were 1000 units of catalyst, pH 8.0 and DO 4.0 mg·L-1. In the SBR stage, the effects of aeration and sedimentation time on the treatment of dyestuff wastewater were investigated and optimized at an aeration time of 2.5 h and a deposition time of 1 h. The removal rates of color, CODCr and BOD5 in the ultimate outlet water were 90%, 85% and 94%, respectively.
