一些研究表明,植物可以吸收各种微污染物。在种植蔬菜或玉米混合物的凸起床上,全面研究了污水处理厂资源中微污染物的行为。床层要么用处理过的废水灌溉,要么富含污水污泥或堆肥的污水污泥。一年来,废水样品,从床上排出的水,对土壤和植物进行了分析。在七十五种被分析的物质中,五十四,对废水中的三十三和二十七进行了量化,污水污泥,和堆肥污泥,分别。令人震惊的是,在用废水灌溉的床浸出的溶液中也检测到大约20%的废水化合物(例如,加巴喷丁,曲马多,舍曲林,卡马西平,它的代谢物,和苯并三唑)。此外,四种物质(替米沙坦,文拉法辛,卡马西平,西酞普兰)记录在这些床上。用于土壤富集的两种生物固体的化合物倾向于保留在土壤中(例如,替米沙坦,文拉法辛,舍曲林,它的代谢产物,西酞普兰,及其代谢物)。只有四种化合物(舍曲林和三种苯并三唑)从这些床上浸出。摄取一些化学品(例如,加巴喷丁,曲马多,卡马西平及其代谢物,和文拉法辛及其代谢物)及其在植物组织中的积累主要在用废水灌溉的床上种植的蔬菜中观察到。然而,食用植物部分和单个化合物的每日消费值并未表明对人类健康的直接威胁。这项创新研究的结果表明,在农业中使用这些资源可能存在风险。特别令人关注的是可能的微污染物向地下水渗透,包括那些预期在土壤环境中具有高吸附和低迁移率的物质,比如舍曲林。土壤和作物污染也不容忽视。
Several studies have shown that plants can absorb various micropollutants. The behavior of micropollutants from wastewater treatment plant resources was comprehensively investigated in raised beds in which either a mixture of vegetables or maize was grown. The beds were either irrigated with treated wastewater or enriched with sewage sludge or composted sewage sludge. Over the year, samples of wastewater, water drained from the beds, soils and plants were analyzed. Of the seventy-five analyzed substances, fifty-four, thirty-three and twenty-seven were quantified in wastewater, sewage sludge, and composted sludge, respectively. Alarmingly, approximately 20 % of the compounds from wastewater were also detected in the solutions leached from the beds irrigated with wastewater (e.g., gabapentin, tramadol, sertraline, carbamazepine, its metabolites, and benzotriazoles). In addition, a gradual increase in the content of four substances (telmisartan, venlafaxine, carbamazepine, citalopram) was recorded in these beds. The compounds from both biosolids used for soil enrichment tended to remain in the soils (e.g., telmisartan, venlafaxine, sertraline, its metabolite, citalopram, and its metabolite). Only four compounds (sertraline and three benzotriazoles) leached from these beds. Uptake of some chemicals (e.g., gabapentin, tramadol, carbamazepine and its metabolite, and venlafaxine and its metabolite) and their accumulation in plant tissues was observed mainly in vegetables grown on beds irrigated with wastewater. However, daily consumption values for edible plant parts and individual compounds did not indicate a direct threat to human health. Results of this innovative study show possible risks associated with the use of these resources in agriculture. Of particular concern is the possible micropollutants percolation towards groundwater, including those for which high sorption and thus low mobility in the soil environment is expected, such as sertraline. Soil and crop contamination cannot be neglected either.