【摘要】 采用有氧烧结法和还原烧结法处理苏州河底泥,研究了底泥中重金属的无害化效果.结果表明,有氧烧结温度900℃以上时,对Cu、Pb、Zn、Cd去除率达40%~65%;烧结温度为500~900℃时,尽管对Cu、Pb、Zn、Cd去除效果不明显,但能有效抑制其溶出.有氧烧结法不仅不能实现Cr的去除,而且会增加Cr的溶出,这是由于有氧烧结过程中Cr(III)被转化为Cr(VI),而底泥对Cr(VI)的吸附能力很有限.还原烧结法则能有效防止底泥中Cr(III)向Cr(VI)的转化,从而抑制包括Cr在内的重金属的溶出.更多还原

【Abstract】 The detoxification effects of heavy metals in sediment was studied, adopting oxy calcinetion and reducing calcinations techniques to treat the Suzhou River sediment. Up to 40%~65% of Cu、Pb、Zn、Cd removed by oxy calcination at temperatures higher than 900℃ . When the temperature was 500~900℃, even though the removal effect was not obvious, but could inhibit effectively the dissolution of the heavy metals. The oxycalcination technique could not only be unable to remove Cr; but also could increase the release of Cr, this was due to the transformation of Cr(III) into Cr(VI) in the calcinations process, while adsorption of Cr(VI) on sediment was limited. The reducing calcination technique could avoid effectively the transformation of Cr(III) in sediment to Cr(VI); thus control the dissolution of heavy metals including Cr.更多还原