Implications of Rate - Limited Mass Transfer for Aquifer Storage and Recovery Efficiency

نویسندگان

  • Sean L. Culkin
  • Kamini Singha
  • Peter Flemings
  • Demian Saffer
  • Katherine H. Freeman
چکیده

I grant The Pennsylvania State University the nonexclusive right to use this work for the University's own purposes and to make single copies of the work available to the public on a not-for-profit basis if copies are not otherwise available. ABSTRACT Pressure to decrease reliance on surface-water storage has led to increased interest in aquifer storage and recovery (ASR) systems, where boreholes are used to inject potable water into aquifers and subsequently recover the stored water during times of peak demand, seasonal deficit, or extended drought. The viability of an ASR scheme is usually measured by recovery efficiency, which is defined as the ratio of recovered water that meets a predefined standard to total volume of injected fluid. Recovery efficiency can be enhanced or degraded by a number of physical and geochemical processes. At ASR sites, rate-limited mass-transfer (RLMT), which describes the exchange of solutes between mobile and immobile porosity domains, may control transport behavior that cannot be explained strictly by advection and dispersion processes. RLMT at ASR sites, in addition to dispersive mixing, can have a significant impact on the use and viability of the ASR scheme due to its impact on recovery efficiency. Despite the apparent utility of ASR as an emerging technology, few studies have utilized numerical models in conjunction with field observations of flow and transport, or considered the impact of RLMT processes on ASR systems. We present data from a pilot-scale ASR study in Charleston, SC and develop a three-dimensional (3D) finite-difference model to evaluate the impact of flow and transport processes, including different mechanisms of mass transfer, on ASR efficiency. We present evidence that RLMT processes cause a rebound in salinity during freshwater storage in a brackish aquifer. Single ASR-cycle model results demonstrate maximum efficiencies near 60%, and are degraded by large immobile pore volumes and high mass transfer rates between mobile and immobile domains. iv Multi-cycle results show low efficiencies due to RLMT degrading water quality during storage over 1-3 ASR cycles; however, efficiencies can evolve and improve markedly over ten cycles, exceeding efficiencies generated by advection-dispersion only models. For an idealized ASR model where RLMT is active, our simulations show a discrete range of diffusive length scales over which storage of freshwater in brackish aquifers may not be viable.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Implications of rate-limited mass transfer for aquifer storage and recovery.

Pressure to decrease reliance on surface water storage has led to increased interest in aquifer storage and recovery (ASR) systems. Recovery efficiency, which is the ratio of the volume of recovered water that meets a predefined standard to total volume of injected fluid, is a common criterion of ASR viability. Recovery efficiency can be degraded by a number of physical and geochemical processe...

متن کامل

Energy efficiency in a building complex through seasonal storage of thermal energy in a confined aquifer

Confined aquifers are formations surrounded by impermeable layers called cap rocks and bed rocks. These aquifers are suitable for the seasonal storage of thermal energy. A confined aquifer was designed to meet the cooling and heating energy needs of a residential building complex located in Tehran, Iran. The annual cooling and heating energy needs of the buildings were estimated to be 8.7...

متن کامل

Electrical characterization of non-Fickian transport in groundwater and hyporheic systems

[1] Recent work indicates that processes controlling solute mass transfer between mobile and less mobile domains in porous media may be quantified by combining electrical geophysical methods and electrically conductive tracers. Whereas direct geochemical measurements of solute preferentially sample the mobile domain, electrical geophysical methods are sensitive to changes in bulk electrical con...

متن کامل

Bromide transport before, during, and after colloid mobilization in push-pull tests and the implications for changes in aquifer properties

[1] Bromide breakthrough curves from push-pull tests were obtained at two wells before, during, and after citrate injections to assess how citrate-induced colloid mobilization affected physical aquifer transport properties. Tailing and incomplete bromide recoveries (67–95%) could not be fit with a conservative advection/dispersion model, and the results of batch tests using aquifer solids impli...

متن کامل

Propionic acid extraction in a microfluidic system: simultaneous effects of channel diameter and fluid flow rate on the flow regime and mass transfer

In this work, extraction of propionic acid from the aqueous phase to the organic phase (1-octanol) was performed in T-junction microchannels and effects of channel diameter and fluid flow rate on the mass transfer characteristics were investigated. The two-phase flow patterns in studied microchannels with 0.4 and 0.8 mm diameters were observed. Weber ‎ number and surface-to-volume ratio were ca...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2007