CSIRO Land and Water, Private Bag No 2, Glen Osmond, SA, 5064, Australia.
CSIRO Land and Water, Private Bag No 2, Glen Osmond, SA, 5064, Australia.
Water Res. 2017 Jun 15;117:1-8. doi: 10.1016/j.watres.2017.03.049. Epub 2017 Mar 25.
Aquifer Storage and Recovery (ASR) is increasingly being considered as a means of reusing urban stormwater to supplement available urban water resources. Storage of stormwater in an aquifer has been shown to affect water quality but it has also been claimed that storage will also decrease the stormwater quality variability making for improved predictability and management. This study is the first to document the changes in stormwater quality variability as a result of subsurface storage at four full scale ASR sites using advanced statistical techniques. New methods to examine water quality are required as data is often highly left censored and so traditional measures of variability such as the coefficient of variation are inappropriate. It was observed that for some water quality parameters (most notably E. coli) there was a marked improvement of water quality and a significant decrease in variability at all sites. This means that aquifer storage prior to engineered treatment systems may be advantageous in terms of system design to avoid over engineering. For other parameters such as metal(loids)s and nutrients the trend was less clear due to the numerous processes occurring during storage leading to an increase in variability, especially for geogenic metals and metalloids such as iron and arsenic. Depending upon the specific water quality parameters and end use, use of ASR may not have a dampening effect on stormwater quality variability.
含水层储存和恢复（ASR）越来越被认为是一种利用城市雨水补充可用城市水资源的方法。已经证明，将雨水储存在含水层中会影响水质，但也有人声称，储存还会降低雨水水质的变异性，从而提高可预测性和管理水平。本研究首次使用先进的统计技术，在四个全规模 ASR 现场记录了地下储存对雨水水质变异性的影响。由于数据通常高度左偏，因此需要新的水质检查方法，传统的变异性度量（如变异系数）并不适用。结果表明，对于某些水质参数（尤其是大肠杆菌），所有地点的水质都有明显改善，变异性显著降低。这意味着在工程处理系统之前进行含水层储存可能在系统设计方面具有优势，以避免过度设计。对于金属（类）和营养物等其他参数，由于储存过程中发生了许多过程，导致变异性增加，这种趋势不太明显，特别是对于铁和砷等地球成因的金属和类金属。具体取决于特定的水质参数和最终用途，ASR 的使用可能不会对雨水水质变异性产生抑制作用。
