新烟碱类杀虫剂(NEO)作为全球最普遍的一类杀虫剂已得到广泛使用,并且在环境中经常被发现,对生物多样性和人类健康构成潜在风险。从废水处理厂(WWTP)排放的废水是环境近地天体的重要来源。然而,通过处理工艺处理后,追踪污水处理厂不同处理单元中NEO变化的研究仍然有限。因此,这项研究旨在使用不同的处理工艺全面调查两个市政污水处理厂中9个母体近地天体(p-NEO)和5种代谢物的命运。UNITANK进水(出水)中∑NEO的平均浓度,厌氧-缺氧-氧(A2/O),循环活性污泥系统(CASS)工艺为189ng/L(195ng/L),173纳克/升(177纳克/升),和123纳克/升(138纳克/升),分别。恐龙,吡虫啉,噻虫嗪,啶虫脒,和噻虫胺是WWTP中最丰富的p-NEO。常规废水处理工艺对废水中的近地天体去除效果不佳(-4.91%至-12.1%),尤其是大型p-NEO。此外,对各种处理单元中近地天体的行为进行了调查。结果表明,生物降解和污泥吸附是消除NEO的主要机制。缺氧或厌氧处理单元可以提高生物处理过程中近地天体的去除效率。然而,终端处理单元(氯化消毒罐)无法清除大多数近地天体。从WWTP释放到华南珠江接收水域的近地天体的估计总量约为6.90-42.6g/d。这些发现为当前废水处理系统中去除近地天体的不同处理工艺的效率提供了新的见解。
Neonicotinoid insecticides (NEOs) have gained widespread usage as the most prevalent class of insecticides globally and are frequently detected in the environment, posing potential risks to biodiversity and human health. Wastewater discharged from wastewater treatment plants (WWTPs) is a substantial source of environmental NEOs. However, research tracking NEO variations in different treatment units at the WWTPs after being treated by the treatment processes remains limited. Therefore, this study aimed to comprehensively investigate the fate of nine parent NEOs (p-NEOs) and five metabolites in two municipal WWTPs using distinct treatment processes. The mean concentrations of ∑NEOs in influent (effluent) for the UNITANK, anaerobic-anoxic-oxic (A2/O), and cyclic activated sludge system (CASS) processes were 189 ng/L (195 ng/L), 173 ng/L (177 ng/L), and 123 ng/L (138 ng/L), respectively. Dinotefuran, imidacloprid, thiamethoxam, acetamiprid, and clothianidin were the most abundant p-NEOs in the WWTPs. Conventional wastewater treatment processes were ineffective in removing NEOs from wastewater (-4.91% to -12.1%), particularly major p-NEOs. Moreover, the behavior of the NEOs in various treatment units was investigated. The results showed that biodegradation and sludge adsorption were the primary mechanisms responsible for eliminating NEO. An anoxic or anaerobic treatment unit can improve the removal efficiency of NEOs during biological treatment. However, the terminal treatment unit (chlorination disinfection tank) did not facilitate the removal of most of the NEOs. The estimated total amount of NEOs released from WWTPs to receiving waters in the Pearl River of South
China totaled approximately 6.90-42.6 g/d. These findings provide new insights into the efficiency of different treatment processes for removing NEOs in current wastewater treatment systems.