Pump-and-treat technology is among the most used technologies for groundwater remediation. While conventional, vertical wells (VRWs) are well-known and used from long time, horizontal wells (HRWs) have been explored for remediation technologies only in last few decades. HRWs have shown to outperform vertical wells in terms of versatility, productivity and clean-up times under certain conditions.

In this paper, the efficacy of an innovative pump-and-treat (P&T) configuration for groundwater remediation obtained by adopting either VRWs or HRWs technology is comparatively tested. A 3D transient finite element model of an unconfined aquifer containing a hexavalent chromium (Cr^(VI)) contamination plume is considered to compare a single horizontal well configuration vs a range of spatially-optimised arrays containing vertical wells.

A sensitivity analysis aimed at finding the best configuration to minimise the remediation time and the related cost is carried out by comparing different well diameters, D, pumping rates, Q, and position of wells. A comparative cost analysis demonstrates that, for the examined case-study, a single HRW achieves the clean-up goals in the same time span as for a greater number of vertical wells, but at higher price due to the excavation costs.

抽水处理技术是用于地下水修复的最常用技术之一。尽管传统的垂直井（VRW）众所周知并且使用了很长时间，但直到最近几十年才对补救技术进行了水平井（HRW）的探索。在某些条件下，HRW在多功能性，生产率和清理时间方面均表现优于立井。

在本文中，对通过采用VRW或HRW技术获得的用于地下水修复的创新泵处理（P＆T）配置的功效进行了比较测试。包含六价铬（Cr ^（VI））污染羽流的无限制含水层的3D瞬态有限元模型被认为可以比较单个水平井构造与一系列包含垂直井的空间优化阵列。

通过比较不同的井径，D，泵速，Q和井的位置，进行了旨在寻找最佳配置以最大程度减少补救时间和相关成本的敏感性分析。一项比较成本分析表明，对于所研究的案例研究，与多个垂直井一样，单个HRW在相同的时间范围内达到了清理目标，但由于开挖成本，价格较高。