粉煤灰负载纳米FeS处理酸性含铬废水动态试验OA北大核心CSTPCD

To address the problem of severe pollution by acidic chromium-contaminated wastewater in mining areas,a novel adsorbent material known as nano-FeS loaded with fly ash(nFeS-F)was pre-pared by the ultrasonic precipitation method.Constructed with fly ash and nFeS-F as fillers,the dynam-ic columns 1#and 2#were employed to conduct dynamic treatment tests on acidic chromium-contaminated wastewater,after which the fly ash and nFeS-F were characterized by XRD,SEM,TEM,and XPS to investigate the regularity,long-term performance and removal mechanism of the fly ash and nFeS-F in treating acidic chromium-contaminated wastewater.The results showed that under the condition of influent Cr(Ⅵ)concentration of 100 mg/L,the average removal rates of Cr(Ⅵ)and total chromium of 1#col-umn were 42.86%and 36.65%,and those of 2#column were 70.74%and 53.12%,respectively,within 28 days of operation of the columns.By the end of the test,the pH of 1#column and 2#column were5.50 and6.38,respectively.According to the XRD and XPS characterization of nFeS-F,Cr(Ⅵ)was reduced to Cr(Ⅲ)and subsequently immobilized on the surface of nFeS-F,manifesting as precipi-tates of hydroxide and sulfide.nFeS-F showed excellent adsorption performance for Cr(Ⅵ)in the test.These findings can provide some technical reference for the treatment of acidic chromium-contaminated wastewater.