The Occurrence Characteristics and Inactivation Mechanism of Viruses in the Advanced Oxidation Pretreatment Process of Sludge
Extracellular polymeric substances(EPS)in municipal sludge are the main nutrient base for pathogenic microorganisms,which can firmly bind to viruses in sludge through adsorption.If it is not effec-tively inactivated,it will pose a risk of transmission during subsequent disposal of sludge.Advanced oxida-tion pretreatment technology can improve virus inactivation efficiency by destroying the protein capsid of virus.Therefore,the focus is on studying and comparing the occurrence characteristics and inactivation mechanisms of sludge viruses in three typical oxidation processes(Fe(Ⅱ)/H2O2,Fe(Ⅱ)/Na2SO3,K2FeO4).The research results indicate that the optimal virus inactivation effect in sludge is achieved when the H2O2 dosage is 62.5 mg/gDS,the S2O82-/Fe2+dosage is 1.2/1.5 mmol/gDS,and the K2FeO4 dosage is 79 mg/gDS.Among them,most of the virus in the sludge liquid phase are effectively inactivated,while the viruses remaining in the solid phase are not easily inactivated.Especially in the Fenton and Fe-S treatment processes,the degradation of tyrosine and aromatic hydrocarbons in the protein components of the sludge solid phase produces by-products that are beneficial for the production of SARS-CoV-2 virus,leading to a phenomenon of repeated growth of SARS-CoV-2 virus.The study also found that Enterovirus 71 and SARS-CoV-2 viruses in the sludge liquid phase are more easily inactivated than in the sludge solid phase.
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