Wastewater Toxicity Articles on Environmental XPRT

Daphnia magna wastewater toxicity assays: an interlaboratory study

In order to protect aquatic life, many acute and short-term chronic whole effluent toxicity (WET) tests have been employed for assessment of the toxicity of wastewater. Toxicity tests using biological responses to measure effects provide valuable information about the significance of chemical contamination. The response of an organism to contaminated effluents provides an integrated measure of ...

Nov. 8, 2007

By Inderscience Publishers

The 'whole-effluent' toxicity approach

The identification and quantification of effluent toxicity plays an important role in the evaluation of harmful impacts on the aquatic environment. The aim of this study was to demonstrate the advantages of using the 'whole-effluent' toxicity approach compared to prediction of toxicity using key toxic compounds. An underestimation of 'whole-effluent' toxicity was always observed using bacteria, ...

Nov. 8, 2007

By Inderscience Publishers

Toxicity Evaluation of Wastewater Treatment Plant Effluents Using Daphnia magna

Abstract Toxicity evaluation is an important parameter in wastewater quality monitoring as it provides the complete response of test organisms to all compounds in wastewater. The water flea Daphnia magna straus is the most commonly used zooplankton in toxicological tests. The objective of this study was to evaluate the acute toxicity of effluents from different units of Isfahan Wastewater ...

Jun. 1, 2005

By Iranian Journal of Environmental Health Science and Engineering

Online Instrumentation to Protect Wastewater Facilities from Toxic Chemicals

ABSTRACTSecurity concerns are driving current research to develop means of detecting toxic chemicals in wastewater influents as few online instruments are currently available for this purpose. Online respirometers such as the STIPTox are the obvious choice using existing, established technology. One of these units was recently used successfully in the WERF project 03-CTS-7S “Feasibility Testing ...

Oct. 22, 2006

By Water Environment Federation (WEF)

Emphasis Shifting to Toxicity Reduction

Untitled Document Under the Clean Water Act (CWA), the U.S. Environmental Protection Agency (EPA) established the National Pollutant ...

Jun. 1, 1993

By Calgon Carbon Corporation

Can a moving bed bioreactor reduce toxicity of complex industrial wastewater?

MeadWestvaco Corporation in DeRidder, Louisiana refines crude tall oil (a byproduct of black liquor) to produce a variety of specialty chemicals products. The facility generates approximately 0.46 million gallons per day (mgd) of wastewater that require treatment for total recoverable phenols (TRP), chemical oxygen demand (COD), biochemical oxygen demand (BOD), and whole effluent toxicity (WET). ...

Oct. 13, 2007

By Water Environment Federation (WEF)

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 ...

Jan. 1, 2004

By Society of Environmental Toxicology and Chemistry (SETAC)

Practical automatic control of a sequencing batch reactor for toxic wastewater treatment

This paper investigates the application of a practical and robust control strategy for the operation of a sequencing batch reactor (SBR) used for toxic wastewater treatment. The strategy sets the operational conditions of the SBR based on the on-line information collected during the previous batch. In particular, it sets the exchange volume of the reactor, as well as the batch reaction duration ...

Feb. 1, 2011

By IWA Publishing

Toxicity reduction and biodegradability enhancement of cork processing wastewaters by ozonation

Biodegradability enhancement and detoxification of cork boiling wastewater (CBW) are required for the successful implementation of biological treatment options. We studied the possibility of achieving these goals through ozonation pre-treatment by experimenting on the effect of ozone dose and pH. The CBW used had a pH of 5.81, a chemical oxygen demand (COD) of 1,865 mg L−1, a biochemical ...

Nov. 29, 2013

By IWA Publishing

Multispecies acute toxicity evaluation of wastewaters from different treatment stages in a coking wastewater‐treatment plant

Coking wastewater contributes approximately 5% of the total discharge volume of industrial wastewaters every year in China. The toxicity of coking wastewater to aquatic organisms is still unknown. The authors evaluated the toxicity of wastewater from different treatment stages in a coking wastewater treatment plant, South China, using 5 test species belonging to different trophic levels: ...

Jul. 9, 2014

By John Wiley & Sons, Ltd.

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 ...

Jan. 1, 2003

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. ...

Jan. 1, 2003

By Challenge Technology

Toxicity management: it's a bug's life

Untitled Document Most biological treatment plants that accept industrial wastewaters expirience problems from time to time with ...

Sep. 1, 2002

By Strathkelvin Instruments Ltd.

Developmental toxicity of treated municipal wastewater effluent on the Bombina orientalis (Amphibia: Anura) embryos

Amphibian populations have been decreasing in urban freshwater systems in Korea. To elucidate the biological safety of treated wastewater effluent (TWE) in the Tancheon basin, the capital area of Korea, 7 d exposure Bombina orientalis embryo developmental toxicity assay was examined during breeding season. In March, there were no significant differences in embryonic survival or malformation ...

Jan. 16, 2014

By John Wiley & Sons, Ltd.

Corrective Action Strategies during Toxic Shock Events at Enhanced Biological Phosphorus Removal Wastewater Treatment Plants

ABSTRACT Toxic shock events can be detrimental to wastewater treatment systems and can result in longterm losses of system performance. If warned of an impending toxic shock, operators would have the opportunity to implement process controls that could help mitigate the effects of the shock event. The objective of this project was to evaluate the effectiveness of a developed corrective ...

Oct. 13, 2007

By Water Environment Federation (WEF)

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 ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Dewatering as a non-toxic control of nuisance midge larvae in algal wastewater treatment floways

Attached-algae floways have tremendous potential for use in wastewater treatment because natural algal communities show high nutrient removal efficiencies, have low operating costs, and are easy to maintain. Algal wastewater floways may also serve as a sustainable option for producing renewable energy because algae grow rapidly, are easily harvested, and can serve as a source of biomass for ...

Jan. 21, 2015

By IWA Publishing

Toxic effects of combined stressors on Daphnia pulex: Interactions between diazinon, 4‐nonylphenol, and wastewater effluent

Contaminant exposure in aqueous systems typically involve complex chemical mixtures. Given the large number of compounds present in the environment, it is critical to rapidly identify hazardous chemical interactions. This study utilizes a prototype for a novel high throughput assay to quantify behavioral changes over time to identify chemical interactions that affect toxicity. The independent ...

Feb. 5, 2015

By John Wiley & Sons, Ltd.

Removal of potentially toxic elements from aqueous solutions and industrial wastewater using activated carbon

Water contamination with potentially toxic elements (PTEs) has become one of the key issues in recent years that threatens human health and ecological systems. The present study is aimed at removing PTEs like cadmium (Cd), chromium (Cr), copper (Cu) and lead (Pb) from aqueous solutions and industrial wastewater using activated carbon (AC) as an adsorbent through different batch and column ...

Mar. 3, 2017

By IWA Publishing

Toxic dissolved and dispersed hydrocarbon removal in industrial wastewater and groundwater treatment and reuse with the Macro Porous Polymer Extraction Technology

Abstract The trend to more severe discharge requirements and to polluted groundwater treatment pushed by governments and followed by industries goes together with the development of more advanced water treatment technologies. Nowadays these requirements have gained such high standards that one step further to contaminated water reuse becomes attractive, especially in areas where fresh water ...

Oct. 5, 2009

By Veolia Water Technologies Techno Center Netherlands B.V. - MPP Systems

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