| 摘要: | In this study, electrocoagulation (EC) was used to investigate the decolorization and mineralization of
an azo dye solution, as well as biodegradation enhancement and toxicity reduction. Initial pH, flow rate, and acid
orange 6 concentration were investigated, and the optimum operational parameters were found to be pH = 4, flow
rate (Q) = 0.3 to 0.5 L min−1, and current density = 68.3 A dm−2. With these optimal parameters, total organic
carbon and color removal efficiencies of 40% and 98% were achieved, respectively. Biodegradation was evaluated
using the ratio of the 5-day biological oxygen demand (BOD5) and the chemical oxygen demand (COD), which
was 0.19 to 0.25 initially and increased to the range 0.25 to 0.4 after EC treatment, indicating that biodegradability
was significantly enhanced. The mean effective concentration (EC50) was measured to represent the toxicity of the
solution. Initial EC50 values ranged from 25 to 6.6%, which represent extremely toxic to very toxic solutions. After
EC treatment, the toxicity levels were reduced significantly, suggesting that the EC process could be a promising
method for reducing the toxicity of textile wastewater.
2007 Society of Chemical Industry |
