toxicity testing system Articles

  • Whole Effluent Toxicity Testing

    What is Whole Effluent Toxicity (WET) testing? Whole Effluent Toxicity (WET) testing is an important component of the U.S. Environmental Protection Agency’s (USEPA’s) integrated approach for detecting and addressing toxicity in surface waters. The National Pollutant Discharge  Elimination System (NPDES) permit program, authorized by the Clean Water Act, controls water pollution by ...

  • Evaluation of Metals, Metalloids, and Ash Mixture Toxicity Using Sediment Toxicity Testing

    In December 2008, a release of 4.1 million m3 of coal ash from the Tennessee Valley Authority Kingston Fossil plant occurred. Ash washed into the Emory River and migrated downstream into the Clinch and Tennessee Rivers. A Baseline Ecological Risk Assessment evaluated risks to ecological receptors from ash in the river system post‐dredging. This paper describes the approach used and results ...


    By John Wiley & Sons, Ltd.

  • Nitrification toxicity evaluation using bench-scale testing

    The Camas Wastewater Treatment Facility experienced a prolonged period of poor ammonia removal (nitrification). A variety of “real-world” bench tests were developed and performed to determine if toxins were inhibiting the nitrification process. The focus of this paper is on the methodology used and conclusions drawn from the bench-testing. INTRODUCTIONTest were performed that compared ...

  • Acute toxicity and inactivation tests of CO2 on invertebrates in drinking water treatment systems

    In addition to the esthetic problem caused by invertebrates, researchers are recently starting to be more aware of their potential importance in terms of public health. However, the inactivation methods of invertebrates which could proliferate in drinking water treatment systems are not well developed. The objective of this study is to assess the acute toxicity and inactivation effects of CO2 on ...


    By IWA Publishing

  • Detection and measurement of toxic gases from destructive testing of batteries

    Problem Statement New formulations of organic-compound-based batteries for vehicle use must be tested for release of potentially harmful and toxic gases if crushed in accidents. Potential gases include hydrocarbons, fluorocarbons, and hydrogen fluoride, released within seconds of an incident. Actual time-resolved and quantitative data are required from destructive testing to ascertain ...


    By CIC Photonics

  • A comparative study of perchlorate degradation in acute toxicity and chronic toxicity

    Since the discovery of perchlorate in water system, the public has been concerned about its human health effect. In practice it was reported that chronic exposure to perchlorate may lead to damage in thyroid hormone activity. This study introduced a method of perchlorate reduction, using autotrophic bacteria which utilise hydrogen as an electron donor. Two experiments were conducted to compare ...


    By IWA Publishing

  • Toxicity Assessment Using a Dilution Series

    Toxicity, or more appropriately, inhibition, is a measure of the interference of a compound or compounds with biodegradation. Since inhibition usually is expressed as the interference with bioconversion of an oxygen-consuming reaction – or gas producing reaction in the case of anoxic or anaerobic reactions – it is essential that a biodegradable substrate be present when assessing toxicity of ...


    By Challenge Technology

  • Assessment of Acute Toxicity to Treatment Plants

    Assessment of Acute Toxicity to Treatment Plants Situations often occur where rapid assessment of potential toxicity to a treatment process is needed, for example, when hauled wastes are discharged to treatment plants. In these cases, the test wastewater is added in various ratios to a mixed liquor suspension along with an organic substrate that is known to degrade well by the test culture. ...


    By Challenge Technology

  • The true toxicity of combined pollutants in freshwater

    Aquatic organisms are exposed to many stressors, including a variety of pollutants from human activities. New research suggests that commonly used models in toxicological studies can fail to adequately predict the range of effects of complex mixtures of chemicals in aquatic environments. Stress caused by combinations of man-made pollutants found in water systems can compound the effects of ...

  • FTIR meets Fire Testing needs for toxic gas analysis - Case study

    One of the most dangerous aspects of a fire is the toxic gases that can arise from the process of combustion. To save lives and develop safer materials for airplanes, trains, and buildings, it is vital to identify and measure the gases that are released when products and materials are burning. The BASF Fire Technology Laboratory in Ludwigshafen, Germany, conducts fire testing on materials to ...


    By Gasmet Technologies Oy

  • 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

  • Follow toxic gas standards for a smoother project

    Toxic gases, such as Hydrogen Sulfide and Sulfur Dioxide, can injure and kill quickly. Therefore, mitigation of these hazards must be fast and sure. The United States Occupational Safety and Health Administration (OSHA) and other authorities take detection of these gases very seriously. The American National Standards Institute/ American Petroleum Institute (ANSI/API) and ISA industry standards ...

  • Development of Treatment Systems for Nitrate Ester Wastewater to Meet Toxicity Based Effluent Limits

    ABSTRACT Dyno Nobel, Inc. (Dyno Nobel) operates a plant near Carthage, Missouri, which manufactures various explosives, including commercial dynamite. The plant produces nitrate esters, including primarily nitroglycerine (NG) and ethylene glycol dinitrate (EGDN), for use in explosive products, using continuous flow and batch nitrators. Diethylene glycol dinitrate (DEGDN) and metriol trinitrate ...


    By Weston Solutions, Inc

  • Anaerobic BMP and ATA Tests

    Anaerobic BMP and ATA Tests Biochemical Methane Potential (BMP) tests involve addition of test chemicals or wastewater samples of concern to an anaerobic culture that is contained within a sealed vessel. Methane or total gas production are measured over periods ranging from 1 to 60 days without addition of new chemical or wastewater sample. Modern BMP tests usually involve multiple additions of ...


    By Challenge Technology

  • PETROTOX: An aquatic toxicity model for petroleum substances

    A spreadsheet model (PETROTOX) is described that predicts the aquatic toxicity of complex petroleum substances from petroleum substance composition. Substance composition is characterized by specifying mass fractions in constituent hydrocarbon blocks (HBs), based on available analytical information. The HBs are defined by their mass fractions within a defined carbon number range or boiling ...


    By John Wiley & Sons, Ltd.

  • Toxicity Identification Evaluation (TIE) as a Tool for Water Quality Management

    Whole effluent toxicity (WET) testing has evolved into a critical element of many National Pollutant Discharge Elimination System (NPDES) permits issued to both industrial and municipal dischargers. Over 6,500 dischargers to both fresh and salt waters are required to conduct toxicity tests to determine if their effluent might be potentially toxic to organisms in the receiving system. While ...


    By AECOM

  • Bioswales reduce contaminants associated with toxicity in urban stormwater

    Contamination and toxicity associated with urban stormwater runoff are a growing concern because of the potential for receiving system impacts. California water regulators are mandating implementation of green infrastructure as part of new urban development projects to treat stormwater and increase infiltration. Parking lot bioswales are low impact development practices that promote filtering ...


    By John Wiley & Sons, Ltd.

  • Development of a groundwater fungal strain as a tool for toxicity assessment

    Despite the significant ecological role in groundwater the value of fungi as indicators of groundwater pollution is not known, as fungi are notoriously challenging to assess for toxicity because of their varied morphological components, in particular their filamentous structures. Hence they remain rarely used in environmental risk assessments and monitoring programs for aquatic systems. We ...


    By John Wiley & Sons, Ltd.

  • Development of Water Quality Test Kit Based on Substrate Utilization and Toxicity Resistance in River Microbial Communities

    Methods for measuring toxicity or respiratory activity of microbial cultures can be used as tools for assessing the presence of chemicals and their impact on the streams. The proposed toxicity test is based on the respirometric characteristics of the bacteria according to the principals of Biolog’s microplate system. As the microorganism ...


    By University of Tehran

  • Biodegradation Tests for Wastewater Samples

    Biodegradation Tests for Wastewater Samples Biodegradation tests usually involve comparison of the oxygen uptake of a test sample – or gas production for anoxic or anaerobic tests – to that for a readily biodegradable control substrate (usually acetic acid, ethanol, or aniline). While biodegradation characteristics can vary among chemical types and wastewater sources, typical patterns are shown ...


    By Challenge Technology

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