Efficiency of sulfide control using synergistic calcium peroxide and ferrous ion in sewer pipelines
This paper proposes a CaO2/Fe2+collaborative control method for addressing the corrosion and odor issues in sewer systems.The effect of different dosing methods on the kinetics and mechanism of sulfide oxidation was analyzed,followed by the analysis on the effect of the pH level,temperature,inorganic irons and other factors on the oxidative removal efficiency of sulfide.The results showed that the synergistic oxidation of CaO2/Fe2+for sulfides removal agrees with the pseudo-first-order reaction kinetics with the main active specie of oxidized sulfides of HO·.A molar ratio of CaO2 and Fe2+of 4∶1 corresponds to the optimal the oxidation rate of sulfides.The oxidation rate of sulfide was negatively correlated with correlated with temperature.No significant effect was found for common anions and ammonium ions on oxidation rate.When the ratio of dosage to sewage(W/V)is 0.30％,the recovery period of 50％sulfide generation rate is 8.34 days,which indicates that the synergistic dosing of CaO2/Fe2+can effectively control the formation of sulfide.
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