A Practical Approach to the Design, Monitoring, and Optimization of in Situ Mtbe Aerobic Biobarriers

نویسنده

  • Cristin L. Bruce
چکیده

The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden to Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information, it if does not display a currently valid OMB control number. This document presents a paradigm for the design, monitoring, and optimization of in situ methyl tert-butyl ether (MTBE) aerobic biobarriers. The technology discussed in this document is applied for the purposes of containing or preventing further migration of existing dissolved MTBE groundwater plumes, or for the purpose of eliminating future MTBE discharge to an aquifer at the down-gradient edge of an MTBE source zone. This design paradigm is based on experience gained while designing, monitoring, and optimizing pilot-scale and full-scale MTBE biobarrier systems – most notably, the systems studied at the Naval Base Ventura County (NBVC) at Port Hueneme, CA. It is largely empirically-based, although the design approach does rely on simple engineering calculations. In addition, the document emphasizes gas injection-based oxygen delivery schemes, although it is acknowledged that there are other methods for delivering oxygen to aquifers. This document presents a paradigm for the design, monitoring, and optimization of in situ methyl tert-butyl ether (MTBE) aerobic biobarriers. In this technology, an oxygen-rich biologically reactive treatment zone (the " biobarrier ") is established in situ and down-gradient of the source of dissolved MTBE contamination in groundwater (typically gasoline-impacted soils resulting from leaks and spills at service station sites or other fuel storage and distribution facilities). The system is designed so that groundwater containing dissolved MTBE flows to, and through, the biobarrier treatment zone (ideally under natural gradient conditions so that no pumping is necessary). As the groundwater passes through the biobarrier, the MTBE is converted by microorganisms to innocuous by-products (carbon dioxide and water). Ideally, the groundwater leaving the down gradient edge of the treatment zone contains MTBE at concentrations less than or equal to the treatment target levels. The system also reduces concentrations of other aerobically degradable chemicals dissolved in the groundwater (e.g., benzene, toluene, xylenes, and …

برای دانلود 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

Synthesis and Optimization of Separation Section of MTBE Process

Methyl tertiary butyl ether (MTBE) is known as a promising substitute for tetra ethyl lead (TEL) in order to increase the octane number of gasoline. MTBE process, as many other processes, has two distinguished section, namely reaction section and separation section. In this paper we focus only on synthesis and optimization of separation section of this process. In order to achieve this obje...

متن کامل

Norfloxacin loaded pH triggered nanoparticulate in situ gel for extraocular bacterial infections: Optimization, ocular irritancy and corneal toxicity

In order to achieve prolong corneal contact time of norfloxacin(NFX) for treatment of extra ocular diseases, a pH triggered nanoparticulate in situ gelling system was designed to explore dual advantage of nanoparticles and in situ gelling system, for its ocular delivery. NFX loaded nanocarriers were developed by ionotropic gelation technique using chitosan as a matrix forming polymer, cross-lin...

متن کامل

Norfloxacin loaded pH triggered nanoparticulate in situ gel for extraocular bacterial infections: Optimization, ocular irritancy and corneal toxicity

In order to achieve prolong corneal contact time of norfloxacin(NFX) for treatment of extra ocular diseases, a pH triggered nanoparticulate in situ gelling system was designed to explore dual advantage of nanoparticles and in situ gelling system, for its ocular delivery. NFX loaded nanocarriers were developed by ionotropic gelation technique using chitosan as a matrix forming polymer, cross-lin...

متن کامل

Design, Development and Test of a Practical Train Energy Optimization using GA-PSO Algorithm

One of the strategies for reduction of energy consumption in railway systems is to execute efficient driving by presenting optimized speed profile considering running time, energy consumption and practical constraints. In this paper, by using real route data, an approach based on combination of Genetic and Particle swarm (GA-PSO) algorithms in order to optimize the fuel consumption is provided....

متن کامل

Monitoring process variability: a hybrid Taguchi loss and multiobjective genetic algorithm approach

The common consideration on economic model is that there is knowledge about the risk of occurrence of an assignable cause and the various cost parameters that does not always adequately describe what happens in practice. Hence, there is a need for more realistic assumptions to be incorporated. In order to reduce cost penalties for not knowing the true values of some parameters, this paper aims ...

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

برای دانلود 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

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2004