【摘要】 再生水灌溉是解决水资源短缺的潜在途径之一,关于再生水灌溉条件下蔬菜中重金属的富集情况及污染风险至今仍缺乏研究。本文通过不同水体浇灌蔬菜的试验研究,比较污水浇灌和自来水浇灌,再生水灌溉对蔬菜中重金属的污染相对较小,极大的节约了水资源成本,并为蔬菜提供了大量的生长元素。结果表明,浇灌60 d后,再生水中的重金属在土壤中有一定的富集,但随着淋溶时间的延长,重金属浓度保持不变;在垂直迁移上重金属的浓度变化也不大,基本呈水平趋势;相比土壤环境质量标准(GB 15618—1995),再生水浇灌后的土壤没有额外超标,优于蔬菜种植的土壤标准要求。然而再生水浇灌的蔬菜,重金属有一定的富集,不同的蔬菜品种,重金属富集的情况不同,果实类苦瓜基本处于相对可食用的范围,而茎叶类菜心超出了食品中污染物限量国家标准(GB 2762—2005)。更多还原

【Abstract】 Reclaimed water irrigation is one of the potential ways of solving the shortage of water resources,the pollution risk on migration behavior of heavy metals in the vegetable which is irrigated by reclaimed water is still short of research. Through the experimental study of different kinds of water irrigation methods on vegetable,comparing with sewage irrigation and tap water irrigation,water irrigation didn’ t pollute the soil,and greatly saved the cost of water resources,and even provided a large number of growth elements for vegetables. The results showed that,after leaching by reclaimed water for 60 days,heavy metal from reclaimed water were enriched in soil to a certain degree,but with the leaching time extending,concentrations of the heavy metal remained stable; the variation of heavy metal content in soil irrigated by reclaimed water is small in vertical depth,basically showed the level trend; according to the soil environment quality standard( GB 15618—1995),soil after irrigated by reclaimed water did not exceed the standard,better than soil quality standard of planting vegetables. But,the heavy metals in vegetables which were irrigated byreclaimed water, had a certain concentration, different varieties of vegetables,the status of heavy metal enrichment was different. The bitter of fruit was in the range of relative edible,the stem and leaf of flowering chinese cabbage beyond food contaminants in the national standard( GB 2762—2005).更多还原