Dye Wastewater Treatment by Advanced Oxidation Process with Enhanced Coagulation
The mam problem arisen from dye wastewater treatment is that there are a lot of dye and intermediate compounds which have high chemical oxygen demand and color in wastewater. Those organic compounds processing large and complicated structures are well known to be unbiodegradable. In this study, a series of batch trials using Fenton oxidation method with enhanced coagulation were performed under different conditions to explore their effects on the removal efficiency of COD, SS, and color. Fenton oxidation process is the cheapest method among several advanced oxidation processes (AOP). The OH radicals made from Fenton reaction can break the double bonds in dye into smaller. compounds, effectively reduce COD concentration and let the small chemicals easy to treat by biological treatment later. The results of specific oxygen uptake rate indicate that the toxicity in wastewater is reduced after Fenton reaction. After Fenton reaction, we introduce a brand new concept "Enhanced Coagulation," to find out that how to efficiently remove color, chemical oxygen demand and suspend solids. The combination of Fenton process and enhanced coagulation is proved useful in the dye wastewater treatment. Under proper dosages and conditions, the removal efficiency of chemical oxygen demand and suspend solids can reach 80% and 95% respectively. The removal efficiency of color can reach as high as 99% or even higher.
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