污灌区镉污染麦田安全利用技术的工程应用

为探索工程改良、植物修复、钝化修复、拮抗修复、钝化-拮抗修复技术在污灌区镉(Cd)污染麦田安全利用工程中的应用效果,研究了上述5类技术在河南省某典型污灌区应用后小麦籽粒Cd含量、土壤Cd含量和小麦Cd富集程度。结果表明:拮抗-钝化单一或复合修复可通过影响小麦籽粒Cd的富集和土壤Cd含量来降低小麦受重金属Cd的污染,如施用适量磷基+铁基矿物复合材料可降低38%小麦籽粒Cd含量,施用适量磷基矿物材料B小麦籽粒Cd含量可降低27%~48%,2种处理修复效果显著;其他技术虽有一定修复效果,但并不显著。小麦Cd富集系数(PUF_Cd)可作为评价污灌区Cd污染麦田安全利用工程中技术应用效果的参考指标之一。

ENGINEERING APPLICATION OF SAFE UTILIZATION TECHNOLOGY OF CADMIUM POLLUTED WHEAT FIELD IN SEWAGE IRRIGATION AREAS

In order to explore the application effect of engineered modification, phytoremediation, passivation remediation, antagonism remediation, and the passivation-antagonism remediation technology at safe utilization project of cadmium polluted wheat field in sewage irrigation areas, we studied the wheat grain Cd content, soil Cd content and degree of wheat Cd enrichment after the 5 kinds of techniques applied in a typical sewage irrigation area in Henan. The results showed that:a single or composite treatment of passivation and antagonism could remediate the pollution of Cd in wheat by affecting the enrichment of Cd in wheat grain and the content of Cd in soil; Cd content in wheat grain was significantly reduced by 38% after appropriate application of phosphorus A or B and iron material composites, and the Cd content was significantly reduced by 27% to 48% after appropriate application of phosphorus materials B in wheat grain, and both restorative effects were remarkable; other techniques had some restorative effect, but not significant. The Cd enrichment coefficient of wheat (PUF_Cd) could be used as one indicating index to evaluate the effect of technology application on cadmium polluted wheat field safe utilization project in the sewage irrigation area.