厦门西海域拟疏浚物中重金属含量及其赋存形态与去除重金属污染技术

Content and partitioning and study on removal technology of heavy metals in tentative dredged sediments of Xiamen western harbor

着重研究了厦门西海域拟疏浚物中重金属的含量和赋存形态,探讨了化学试剂浸提和曝气法去除重金属的可行性,为建立后续的去污染方案提供科学依据。厦门西海域拟疏浚物枯洪两季沉积物中重金属含量变化不大,枯季稍高于洪季。从经济角度考虑,选用C2H2O4、(NH4)2C2O4、EDTA作为浸提剂结合曝气和TCLP翻转实验对厦门西海域代表性拟疏浚物样品(X5站位)进行了重金属去除试验。结果表明,几种溶剂中,C2H2O4的效果最好;在相同溶剂条件下,对多数重金属元素,曝气处理可以有效地提高去除率。

Total content and partition of heavy metals in the tentative dredged sediments of Xiamen western harbor were studied with the aim to development of conventional decontamination technology. The chemical extraction repair heavy metals polluted soil used the chemical medicament to exchange hydronium, dissolve （ in acid or alkali） and complexation. The variety of content of heavy metals in Xiamen western harbor is not evident between dry season and rain season, content of heavy metals in dry season is comparatively high- er. This experiment consider from economical, choose ammonium oxalate, oxalic acid and EDTA as the chemical medicament, combi- ning aeration and TCLP upturning, carry though attempt on removing the heavy metals of X5 sample station of Xiamen western harbor. The results showed that the effect of oxalic acid is the best of several chemical medicaments. Using the same chemical medicament, remove the heavy metals much more effective with aeration for most heavy metals.