Kurose Keisuke, Okuda Tetsuji, Nishijima Wataru, Okada Mitsumasa
Graduate School of Engineering, Hiroshima University, 1-4-1, Kagamiyama, Higashi-Hiroshima City, Japan.
J Hazard Mater. 2006 Oct 11;137(3):1618-23. doi: 10.1016/j.jhazmat.2006.04.049. Epub 2006 May 5.
The fate of heavy metals during a separation process for automobile shredder residues (ASR) was investigated. A washing method to remove heavy metals from the ASR was also investigated. Although the separation process was not designed for removal of heavy metals, but for the recovery of reusable materials, the heavy metal content in the ASR was efficiently decreased. The concentrations of Pb, Cr and Cd in ASR were effectively reduced by a nonferrous metals removal process, and the As concentration was reduced by the removal of light dusts during the separation process. Five heavy metals (As, Se, Pb, Cr, Cd) remaining in the ASR after the separation process satisfied the content criteria of the Environmental Quality Standards for Soil (EQSS), while the concentrations of As, Se, Pb in the leachate from the remaining ASR did not satisfy the elution criteria of the EQSS. After additional washing of the remaining ASR with a pH 1 acid buffer solution, the As, Se, and Pb concentrations satisfied the EQSS for elution. These results indicate that an ASR residue can be safely recycled after a separation process, followed by washing at acidic pH.
研究了汽车 shredder 残渣（ASR）分离过程中重金属的去向。还研究了一种从 ASR 中去除重金属的洗涤方法。尽管分离过程并非设计用于去除重金属，而是用于回收可再利用材料，但 ASR 中的重金属含量却有效降低了。通过有色金属去除工艺，ASR 中 Pb、Cr 和 Cd 的浓度有效降低，而 As 浓度则通过分离过程中去除轻质粉尘而降低。分离过程后 ASR 中残留的五种重金属（As、Se、Pb、Cr、Cd）符合土壤环境质量标准（EQSS）的含量标准，而剩余 ASR 渗滤液中 As、Se、Pb 的浓度不符合 EQSS 的洗脱标准。用 pH 为 1 的酸性缓冲溶液对剩余的 ASR 进行额外洗涤后，As、Se 和 Pb 的浓度符合 EQSS 的洗脱标准。这些结果表明，经过分离过程，然后在酸性 pH 下洗涤后，ASR 残渣可以安全回收利用。
