Groundwater Circulation Wells

The remediation of a chlorinated hydrocarbons (CHC) contaminated aquifer always contains a risk, because of the possibility of uncontrolled downwards mobilization of the CHC into deeper parts of the aquifer. This scenario would be even more harmful to the environment. The application of well known remediation techniques for CHC as e. g. pump-and-treat is not useful because of its extremely long duration caused by the low solubility of CHC.

With a GCW it is possible to remove non-miscible liquids of higher density than water (DNAPL) from an aquifer. In order to remove dense non aqueous phase liquids (DNAPL) that have accumulated on the bottom of the aquifer, the GCW is operated in standard mode. The DNAPL is removed by means of a sensor-controlled, pneumatically-driven submersible pump. Thus it is made sure that just pure phase and no groundwater is extracted.

A GCW-system is capable of accumulating and extracting LNAPL during groundwater treatment. The amount groundwater passing through the GCW system can be adjusted according to the type of contamination and the well construction. Recovery of LNAPL floating on top of the groundwater can be achieved by using a GCW-Reverse flow system. Pure LNAPL product can be pumped to an on-site collection tank.

The sphere of influence of GCW (Groundwater Circulation Well) depends on the distance of the two screen sections or, in case of a fully penetrating well, on the aquifer thickness. The larger the circulation cell is, the larger the travel time is for the circulation. For thick aquifers it may be beneficial to install several circulation cells, one upon another. This produces smaller circulation cells and shortens circulation flow time.

IEG GCW 是一个原地修复被污染的地下含水层的修复技术系统。尤其是那些含有卤代挥发性半挥发性有机物(svocs)，农药及石油产品的成分如甲苯，乙苯和二甲苯(苯)等。本修复系统综合利用了化学、物理和生物技术过程.。它们已被广泛应用于从细粉质粘土至粗粒砂砾的各种土壤类型的修复中。

应用范围：
IEG UVB是对地下污染含水层的一种原地修复系统， 尤其是对那些含有挥发性和半挥发性的碳氢化合物污染物，采用化学、物理和生物综合处理技术进行修复。

技术简介：

基本组成：一个IEG UVB处理单元包括一个特别设计的地下水修复井，一个负压汽提反应器，一个地面鼓风机，和一个废气净化系统（例如一次性过滤系统或再生活性炭过滤系统）。

The GCW-MPPE process is an in situ system for the remediation of groundwater contaminated with dissolved or dispersed aromatic, aliphatic, poly aromatic and halogenated hydrocarbons using a combination of a hydraulic controlled flushing/extraction system with a high efficient physical purification system based on macro porous polymer extraction.

由于对环境影响小、使用成本低，近年来，生物修复技术越来越受人们的青睐。

在理想情况下，根据不同的污染物，土壤及其地下水中都存在有相应的微生物自然降解，将有机化合物降解成二氧化碳和水。生物降解的速度取决于降解环境中的物理和化学条件。

IEG原位生物修复技术的目标就是优化自然的降解潜能。通过改善降解生物所需的环境条件，达到降解污染物的最佳效果

The Multi-Functional Well (IEG MFW) has been implemented for the remediation of subsurface contamination caused by hydrocarbon spills. Four different remediation processes can be operated within the same well. At optimal efficiency of each remediation process, successive treatment of the capillary fringes, the vadose zone, and the aquifer can be accomplished. Each treatment process requires only simple modifications of the well configuration. Removal of the contaminants is done primarily through in situ air stripping.

The Reactive Well Technology (GCW-R) significantly enhances the ability to combine a dynamic hydraulic flow system (GCW) with different reactive treatment areas under anaerobic conditions.

The specially designed remediation wells enable easy change to the reactive materials, such as controlled-release carbon plus zero-valent iron (ZVI) or other reduced metals, which is the subject of our EHC technology.

在非饱和区，土壤湿度成为影响生物修复的关键因素。对于大多数自然生物降解过程，其最佳土壤含水量在50%-80%之间。在非饱和区中，使用土壤循环冲洗 井可产生一个垂直多相流，以增强其土壤含水量。其余挥发性碳氢化合物则被原位气提，并吸附在可选的活性碳床上，或在SZB井和不饱和区内被生物降解。水冲 洗被污染的土壤，成为富含污染物的水，经较低的井筛进入SZB井。

IEG-vPRB原位多重循环单元虚拟可渗透反应墙

当把GCW安置于污染的地下水体中时，会相应地在含水层形成大面积球形的液压控制区，含水层中污染的地下水便会被GCW捕获并处理。