Risk assessment of organic pollution of artificial recharge to groundwater environment takes an experimental site at Eastern region of China as an example

As a water resources management strategy, Artificial Recharge (AR) has drawn more and more attention, however, it would bring a pollution risk to groundwater environment, especially organic pollution with characteristics of low concentration, high toxicity and hard degradation. This paper takes an experimental site at Eastern region of China as an example. Total Ambient Severity (TAS) and leaching migration evaluation of organic matters have been taken in the study of external and internal risk. The external risk evaluation results show that, the TAS of Halogenated hydrocarbons is less than 1, and there is no potential risk; the average TAS of Poly cyclic Aromatic Hydrocarbons is 6.765, and there is potential risk, especially the Fluoranthene is in severely or extremely polluted state; the TAS of Dichlorvos is 23.65, which is in a extreme pollution state. The internal risk evaluation results show that, the groundwater ubiquity score of Dichlorvos and Halogenated hydrocarbons are 4.47 and 4.24, which indicate that they have a high leaching migration activity with potential risk for groundwater quality, preventive measures should be considered in the process of AR.