Abstract
The decolorization of wastewater treated by biochemical treatment with Fenton catalytic oxidation technology was studied by using Dashaba sauce-flavored brewing wastewater in Erhe Town of Guizhou city as the research object. The results of single factor and orthogonal test show that the dosages of pH, FeSO4 and H2O2 in wastewater mainly affect the chromaticity of wastewater, while the dosages of pH, quartz sand in wastewater mainly affect the effect of flocculation and sedimentation. When the initial chromaticity and UV254 of the wastewater are 179 degrees and 1.51 cm-1 respectively, the optimum process parameters are pH 6.5, FeSO4 2.5 mmol/L, H2O2 25.0 mmol/L and quartz sand 3.0 g/L. The effluent chromaticity and UV254 removal rate are 68.06% and 31.78%, and the chromaticity reached the emission limit value required in Table 3 of GB 27631~2011 “Emission Standards for Water Pollutants in Fermented Alcohol and Liquor Industry”. Moreover, and the flocculation and sedimentation effect of iron mud is better and the treatment drug consumption is less.
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