Data underlying Biostimulation is a valuable tool to assess pesticide biodegradation capacity of groundwater microorganisms

Groundwater samples were collected at a drinking water abstraction aquifer at two locations, five different depths. Biodegradation of the MPs BAM, MCPP and 2,4-D was assessed in microcosms with groundwater samples, either without amendment, or amended with electron acceptor (nitrate or oxygen) and/or carbon substrate (dissolved organic carbon (DOC)). Oxygen + DOC was the most successful amendment resulting in complete biodegradation of 2,4-D in all microcosms after 42 days. DOC was most likely used as a growth substrate that enhanced co-metabolic 2,4-D degradation with oxygen as electron acceptor.

本研究于两处采样点、五个不同深度的饮用水源开采含水层中采集地下水样本。以采集的地下水样本构建微宇宙培养体系（microcosms），对微量污染物（Micropollutants, MPs）BAM、MCPP及2,4-D的生物降解性能进行评估；实验设置未添加调控剂的对照组，以及分别添加电子受体（硝酸盐或氧气）和/或碳底物（溶解性有机碳（dissolved organic carbon, DOC））的实验组。其中，氧气与溶解性有机碳的组合添加方案效果最优，可在42天后使所有微宇宙培养体系中的2,4-D实现完全生物降解。分析表明，溶解性有机碳大概率作为微生物生长底物，协同以氧气作为电子受体，强化了2,4-D的共代谢降解过程。