sequential sampling system Articles

  • Case study - Low-flow groundwater sampling on a nuclear site

    Nuclear licensed site use of low-flow groundwater sampling shows: Reduced time, reduced quantity of purge water – both thus reducing cost - and reduced risk of operator contact especially with potentially radioactive-contaminated purge water thanks to a self-contained enclosed system. One of the biggest headaches on site is the purge water and the expense of getting rid of it – after ...


    By Geotech

  • System Description for Monitoring Volatile Hydrocarbons

    To help build a comprehensive Industrial Hygiene program, Buck Scientific introduces the IH910 vapor monitoring system utilizing our model 910 gas chromatograph and IH300 air sampling train. Designed to analyze hydrocarbons in air, such as degreasing solvents and paint vapors emitted during plant operations, the IH910 penetrates the 1mg/m3 detection barrier erected by other field portable gas ...


    By Buck Scientific Inc

  • Dual luciferase assay system for rapid assessment of gene expression in saccharomyces cerevisiae

    A new reporter system has been developed for quantifying gene expression in the yeast Saccharomyces cerevisiae. The system relies on two different reporter genes, Renilla and firefly luciferase, to evaluate regulated gene expression. The gene encoding Renilla luciferase is fused to a constitutive promoter (PGK1 or SPT15) and integrated into the yeast genome at the CAN1 locus as a control for ...

  • Expanding the applications of micro irrigation `Drip` treatment and disposal systems in Delaware

    Abstract An 18–month field evaluation of four micro–irrigation "drip" treatment and disposal systems was conducted to determine if reducing the separation distance between the bottom of the drip–line and the seasonal high water table (limiting condition) could be reduced from 18 inches to 12 inches. In this study three systems did not have advanced ...


    By Geoflow, Inc.

  • Case study - Westbay System reduces construction costs by 65%

    Multilevel monitoring network delivers unprecedented definition of groundwater flow and water quality at a reduced cost CHALLENGE OCWD had determined that information  on the piezometric level and water quality  of each aquifer layer was required to  optimize management of the recharge,  storage, and recovery of groundwater. ...


  • Remediation of methylene chloride in soil and groundwater beneath a former manufacturing facility Northwest Atlanta, GA

    TRS Group, Inc. (TRS), as a subcontractor to MACTEC, Inc. (MACTEC) provided a standard fixed price remediation of methylene chloride (MeCl) and trichloroethene (TCE) in soil and groundwater using Electrical Resistance Heating (ERH) for a confidential client in Northwest Atlanta, GA. Valuable location and large area motivated client to select ERH to provide a rapid and complete remediation for ...


    By TRS Group, Inc.

  • Adaptive meta-modeling-based simulation optimization in basin-scale optimum water allocation: a comparative analysis of meta-models

    Incorporating river basin simulation models in heuristic optimization algorithms can help modelers address complex, basin-scale water resource problems. We have developed a hybrid optimization-simulation model by linking a stretching particle swarm optimization (SPSO) algorithm and the MODSIM river basin decision support system (DSS), and have used the SPSO-MODSIM model to optimize water ...


    By IWA Publishing

  • Ultra-trace arsenic speciation at Columbia Analytical

    Ultra-trace speciation of arsenic and other metals is performed using a variety of techniques tailored to the specific combination of species, matrix, and detection limits required. Currently, two analytical systems are applied: Ion Chromatography-Inductively Coupled Mass Spectrometry (IC-ICP-MS) and Hydride Generation-Cryogenic Gas Chromatography-Flame Atomic Absorption Spectrometry ...


  • Remediation of MSW landfill leachate by permeable reactive barrier with vegetation

    This research was conducted to investigate in situ treatment of leachate by pilot-scale permeable reactive barrier (PRB) with vegetation. Two different types of PRB media, with and without the presence of ferric chloride sludge, for the removal of pollutants were examined. The composite media of PRB comprised a clay and sand mixture of 40:60%w/w (system 1) and a clay, ferric chloride ...


    By IWA Publishing

  • Method 301 Evaluation of Candidate conditional methods case study

    A new metal emissions measurement and validation system has recently been developed that has the potential to significantly improve our understanding of metal emissions from a wide range of source categories. This system consists of: A continuous emission monitoring system (Xact-CEMS) An instrumental analyzer procedure (Xact-IAP) A sampling and analysis measurement method ...


    By Cooper Environmental

  • Toxicity reduction in industrial and municipal effluents – the state of the art

    Developments in treatment technology have traditionally focused on removal of specific contaminants: BOD, solids, ammonia, TOC and lately, specific organics such as phenol. A limit on effluent toxicity, however, does not fit so neatly into a procedural package, since it truly integrates the presence and impacts of contaminants in a sample. Toxicity reduction evaluation procedures, therefore, are ...


    By Inderscience Publishers

  • Maintaining biodiesel quality standards

    A problem that is sometimes encountered with biodiesel blends is inaccurate blend ratios. This article describes a quick analytical method to assess blend ratios and ensure fuel performance. According to a study1 done by the National Renewable Energy Laboratory, the chief problem found with biodiesel blends was inaccurate blend ratios. Retail customers and fleet managers do not typically worry ...


    By Spectro Scientific

  • Treatment of Sludge Return Liquors: Experiences from the Operation of Full-Scale Plants

    ABSTRACTMore stringent effluent criteria with regard to nitrogen call for improved nutrient removal techniques in wastewater treatment plants (WWTPs). Besides optimisation of the liquid treatment train of the plants, over the last years, attention has increasinly centred on the problem of return flows from sludge treatment. Depending on sludge handling and treatment, some 15 to 25 % of the ...

  • Treatment plant protected by effluent monitor at major drinks factory

    The installation of a BioTector continuous TOC (Total Organic Carbon) monitor to police the front end of Cobevco’s wastewater treatment plant has enabled tight control of the treatment process. Delivering results 20 times faster than laboratory techniques, the monitor at the Elton facility in Cheshire provides advance notice of organic overload so that the plant is able to instantly divert ...


  • ORP and pH Based Control of SBR Cycles for Nutrient Removal from Wastewater

    ABSTRACTContinuous monitoring of multiple process functions were conducted involving removals of BOD, TSS and nutrients, in each cycle of the SBR reactor at the wastewater treatment plant of the City of Carrabelle, FL. On line, real time, monitoring of pH, oxidation reduction potential (ORP), dissolved oxygen (DO), ammonia-N, nitrite-N, nitrate-N and orthophosphate-P demonstrated excellent ...

  • Pilot-Scale Biofilter Test for Treating Zimpro Odors

    The thermal sludge conditioning process of U.S. Filter/Zimpro Corporation, Rothschild, Wisconsin (Zimpro process) is primarily used to improve dewatering characteristics of the waste sludge. The process entails a partial breakdown through oxidation and hydrolysis of complex, high molecular weight organic compounds, such as, proteins, fibers, carbohydrates, and fats. The partial breakdown of ...


    By PRD Tech, Inc.

  • Gas detector communication technology for offshore oil and gas platforms

    In few applications is safety as important as on offshore oil and gas platforms. Explosive hazards from hydrocarbon gases and vapours are an ever-present risk, whilst toxic hydrogen sulphide gas and depleted oxygen environments can pose significant risks to personnel. Gas detectors are therefore essential to provide dependable early warning of gas hazards. Gas detectors are permanently installed ...

  • Using Lidar for WRA Campaigns: Your Questions Answered (Part I)

    In the course of conversations with wind developers new to Lidar technology, a number of questions seem to come up regularly. In this and future blog posts, I will attempt to answer these questions in some detail to benefit others who might be pondering them as well. Two very practical questions have to do with how WINDCUBE® ...


    By Renewable NRG Systems

  • The Use of Hydrogen Release Compound (HRC) for CAH Bioremediation.

    Hydrogen Release Compound (HRC™) is a simple, passive, low-cost and long-term option for the anaerobic bioremediation of chlorinated aliphatic hydrocarbons (CAHs) via a reductive dehalogenation pathway. Applications to other classes of chlorinated compounds that are anaerobically degradable by this mechanism are under investigation. HRC should be viewed as a tool for the enhancement of natural ...


    By REGENESIS

  • Fitting Into the Neighborhood: Operating by Progressive Odor Management Plan

     Operating by Progressive Odor Management Plan Why would anyone build an $11 million composting facility designed to process an average of 130 tons/day of feedstocks less than one mile from luxury homes, a new high school, a golf course, fast food restaurants, a grocery store, and in an area with a vivid memory of a compost site that impacted the neighborhood and shut down due to odor ...


    By BioCycle Magazine

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