科研之友
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摘要
For the treatment of wastewater containing high concentration of thiocyanate, high-efficiency physicochemical technology is used to achieve its chemical conversion to provide suitable water quality conditions for anaerobic ammonia oxidation (anammox), and to avoid any dilution operation required to protect the subsequent biological processes from toxicity inhibition. Aiming at constructing appropriate conditions for the anammox process, simulated thiocyanate wastewater was taken as the research object. Using the pulsed corona discharge (PCD) system designed by our team, the dynamic transformation of nitrogen pollutants under different pH conditions was investigated along the PCD treatment. The effects of SCN--N degradation by-product (SO4 2- and HCO3 -) concentrations on the transformation of NH4 +-N was studied. And, the degradation kinetics of NH4 +-N under different conditions was studied by fitting to 0-order model. Results showed that PCD technology could effectively oxidize nitrogenous compounds including SCN--N and NH4 +-N to NO3 --N by in-situ generated O3 and ?OH, and the increase in pH is beneficial to the oxidation reaction. SO4 2- and HCO3 - produced in the process of SCN--N oxidation have significant inhibitory effects on the PCD oxidation of NH4 +-N. The inhibitory effects of HCO3 - is higher than SO4 2-. This work indicates that for the treatment of wastewater with high concentration of SCN-, PCD technology can be used as a pretreatment technology for the anammox process, which exhibited superiority in terms of eliminating toxicity inhibition and creating suitable water quality characteristics. ? 2019, Science Press. All right reserved.
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