辅料添加对芝麻粕发酵及镉钝化能力的影响OA北大核心CSTPCD

[Objective]To explore the application value of sesame meal fermented with different excipient additives for remediating cadmium-contaminated soil.[Method]The fermentation treatments were established using sesame meal with different excipient additives:including T1(5 kg sesame meal+1 kg mill offals),T2(5 kg sesame meal+1 kg corn straw)and T3(5 kg sesame meal+1 kg scobs),while the fermentation of sesame meal without excipient additives served as control(CK,6 kg sesame meal).The fermentation period was 30 days.The effects of different excipient additives on the fermentation of sesame meal were investigated by measuring the physicochemical parameters and conducting Fourier transform infrared spectroscopy during the fermentation process of sesame meal.The fermented sesame meal by different excipient additives was then applied to cadmium-contaminated soil,and analyzed its passivation effect on cadmium in soil by detecting the content and speciation of available cadmium.[Result]The pH value,total phosphorus,organic matter and carbon-nitrogen(C/N)ratio of T1,T2 and T3 treatments were significantly higher than in the CK group.Fourier transform infrared spectroscopy analysis showed that the T2 group,containing corn straw,exhibited a higher fermentation degree.In the remediation experiment of cadmium-contaminated soil,the application of T2 reduced the available cadmium content by 81.60%in the soil containing 5 mg·kg-1 of cadmium,showing significantly greater effectiveness than other treatments and the control.In the soil with cadmium content of 1,5,10 mg·kg-1,T2 significantly increased the content of oxidized and residual cadmium,reaching up to 54%.[Conclusion]The addition of mill offals,corn straw and scobs could promote the fermentation process of sesame meal.Sesame meal fermented with corn straw exhibited a significant passivation effect on cadmium in contaminated soil with a cadmium content of 5 mg·kg-1.