生活垃圾焚烧炉渣覆盖层对Cr(Ⅵ)在填埋场中迁移的影响

Effect of Municipal Solid Waste Bottom Ash Layer on The Migration of Cr(Ⅵ) in the Simulated Landfill

通过473 d的模拟填埋场试验,研究了生活垃圾焚烧炉渣覆盖层对Cr(Ⅵ)在填埋场中迁移的影响。研究结果表明,生活垃圾焚烧炉渣覆盖层对Cr(Ⅵ)迁移的影响随着填埋进程而变化。在填埋场运行1~27 d,生活垃圾焚烧炉渣覆盖层截留了渗滤液中的Cr(Ⅵ),这可能是生活垃圾焚烧炉渣对Cr(Ⅵ)的吸附作用所致。第34~97 d,生活垃圾焚烧炉渣中Cr(Ⅵ)溶出量大于吸附量,导致渗滤液中Cr(Ⅵ)浓度增加。第112~473 d,覆盖层对Cr(Ⅵ)又产生截留作用,表明生活垃圾焚烧炉渣对Cr(Ⅵ)的吸附重新占据主导作用。

A simulated landfill was operated for 473 days to investigate the effect of municipal solid waste incinerator( MSWI) bottom ash layer on the migration of Cr( Ⅵ). The results showed that the effect was varied with the running time extension. From day 1 to day 27,Cr( Ⅵ) in the leachate was captured by the MSWI bottom ash layer,which could be due to the adsorption of Cr( Ⅵ) on the MSWI bottom ash.From day 34 to day 97,the Cr( Ⅵ) was largely leached from the MSWI bottom ash,resulting in the increase of Cr( Ⅵ) concentration of the leachate. From day 112 to day 473,Cr( Ⅵ) in the leachate was captured by the MSWI bottom ash layer, suggesting the adsorption of Cr( Ⅵ) on the adsorptive substances dominated.