wastewater toxicity Articles | Environmental XPRT

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

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

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

Evaluation of genotoxicity and oxidative damage induced by coke plant wastewater

In order to elucidate the genotoxicity and oxidative damage exerted by coke plant wastewater, we investigated the effect of coke plant wastewater over a concentration gradient of COD Cr 40–640mg/L on the micronucleus formation in the roots and the antioxidant enzyme activities in the roots and the leaves of Vicia faba . The results suggest that coke plant wastewater can cause genotoxicity ...

Sep. 2, 2014

By Inderscience Publishers

Sorption kinetics for phenol and nitro-substituted toxic phenols from aqueous solution using clay as sorbent material

This study examined the effectiveness of less-expensive sorbent clay in removing phenols from wastewater by sorption. Batch kinetic experiment showed that phenol and nitro-substituted phenols (o-, m- and p-) sorption on clay was rapid and equilibrium was achieved within 2 h. The kinetics of sorption was found to be of pseudo-second order reaction. The influences of various factors, such as ...

Mar. 5, 2010

By Inderscience Publishers

Improving the sensitivity of the activated sludge respiration inhibition test and verifying the results using an oxidation-reduction potential electrode

The inhibition of activated sludge respiration is one of the most important parameters for monitoring wastewater toxicity. The main objective of this study was to improve respiration inhibition testing in order to protect the biological degradation within the aerobic process in a wastewater treatment plant more efficiently. In order to influence the sensitivity of the testing bacteria, two ...

Oct. 11, 2016

By IWA Publishing

Sorption of thallium(I) ions by peat

The increasing industrial use of thallium has raised the need for removal of this highly toxic element from wastewater. Thallium is more toxic than cadmium, copper, zinc, lead and mercury and as it is easily accumulated in humans, animals and plants, it poses a threat to both the environment and human health. Peat has been used as an effective, relatively cheap and easily available sorbent to ...

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.

Predicting the Toxicity of Oil-Shale Industry Wastewaters by its Phenolic Composition

Abstract : The chemical composition and toxicity of five phenolic wastewaters samples collected from the Kohlta-Järve (Estonia) oil-shale industry region were analysed. The total phenolic contents (HPLC data) of these samples ranged from 0.7 mg/l to 195 mg/l. A total of 11 phenol (up to 84 mg/l) and p-cresol (up to 74 mg/l). Artificial phenolic mixtures were also composed, to mimic the ...

Jan. 8, 2020

By Microbiotests Inc.

Electrochemical studies on a textile azine dye: safranin T

Safranin T (3,8-diamino-4,7-dimethylphenyl phenazinium chloride) was selected as the model compound for this study because of its wide application in various textile industries either as such or in combination with some other dyes as colour additives. A small well-defined single cathodic peak was observed which on controlled potential electrolysis (CPE) reduced substantially with a considerable ...

Jul. 25, 2006

By Inderscience Publishers

Combined toxicity of polycyclic aromatic hydrocarbons and heavy metals to biochemical and antioxidant responses of free and immobilized Selenastrum capricornutum

The aquatic environment often contains different groups of contaminants, but their combined toxicity on microalgae has seldom been reported. The present study compared the toxic effects of combined mixed polycyclic aromatic hydrocarbons (PAHs) and heavy metals on growth and antioxidant responses of free and immobilized microalga, Selenastrum capricornutum. Five PAHs‐phenanthrene, fluorene, ...

Dec. 7, 2012

By John Wiley & Sons, Ltd.

Treatment of diazo dye C.I. Reactive Black 5 in aqueous solution by combined process of interior microelectrolysis and ozonation

Interior microelectrolysis (IM) as a pretreatment process was effective to treat Reactive Black 5 (RB5) in this study. The removal rates of chemical oxygen demand (COD), total organic carbon (TOC) and color were 46.05, 39.99 and 98.77%, respectively, when this process was conducted under the following optimal conditions: the volumetric ratio between iron scraps and active carbon (AC) ...

Apr. 11, 2013

By IWA Publishing

Aluminosilicate-based adsorbent in equimolar and non-equimolar binary-component heavy metal removal systems

Cadmium (Cd) and lead (Pb) are toxic heavy metals commonly used in various industries. The simultaneous presence of these metals in wastewater amplifies the toxicity of wastewater and the complexity of the treatment process. This study has investigated the selective behavior of an aluminosilicate-based mesoporous adsorbent. It has been demonstrated that when equimolar quantities of the metals ...

Aug. 19, 2015

By IWA Publishing

Applications of the deep-shaft activated sludge process in wastewater treatment

The deep-shaft activated sludge process is a unique modification of the activated sludge system. The main objective of this system is to increase the amount of dissolved oxygen available for biological activity. This can be achieved by increasing the rate of oxygen transfer from the gas phase to the liquid phase. The deep-shaft configuration increases the partial pressure of oxygen, thereby ...

Jan. 26, 2004

By Inderscience Publishers

Removal of ecotoxicity and COD from tank truck cleaning wastewater

Tank truck cleaning (TTC) activities generate highly complex wastewater. In a previous study, we found that a significant ecotoxic effect was still present in biologically treated TTC wastewater. The aim of the present study was therefore to investigate the removal of acute toxicity from TTC wastewater by a sequence of technologies routinely applied for industrial wastewater. Acute toxicity was ...

Nov. 29, 2013

By IWA Publishing

A Toxic Odor Problem Is Reduced to Almost Nothing - Municipal Wastewater Toxic Odor & Hydrogen Sulfide Control

The Water District for a coastal resort community provides freshwater and sewer service to more than 40,000 residents and two million visitors a year. The district delivers 6 million gallons of water each day to homes and businesses and removes 4 million gallons of wastewater for treatment. The District’s facilities cover a substantial area. The sewer system contains 125 miles of ...

Jul. 29, 2020

By CAS DataLoggers

How Augean protect their wastewater treatment plant and avoid compliance failures - Case Study

Overview Augean PLC is a market-leading specialist waste and resource management company. They are at the forefront of developing innovative process and technological solutions, have permitted strategic locations throughout the UK and are positioned to lead the modernisation of the UK specialist waste infrastructure. At their facility in Avonmouth Augean provides an invaluable service to a wide ...

Jul. 1, 2015

By Strathkelvin Instruments Limited

Synthesis and structure-activity study of quaternary ammonium functionalized β-cyclodextrin-carboxymethylcellulose polymers

Carboxymethylcellulose (CMC) and β-cyclodextrin (β-CD)-based polymers functionalized with two types of quaternary ammonium compounds (QACs), the alkaquat DMB-451 (N-alkyl (50% C14, 40% C12, 10% C10) dimethylbenzylammonium chloride) (DMD-451) named polymer DMB-451, and FMB 1210-8 (a blend of 32 w% N-alkyl (50% C14, 40% C12, 10% C10) dimethylbenzylammonium chloride and 48 w% of ...

Jan. 1, 2011

By IWA Publishing

A review on the use of biopolymers for the removal of toxic metals from liquid industrial effluents

Various industrial processes such as mining, metal plating, metal finishing, and chrome tanning discharge many chemicals and heavy metals into the plant effluent stream. In view of this, the need of developing viable and relevant technologies that can not only cleanup but also recover valuable components from industrial and biological waste streams is of utmost importance. This paper describes ...

Jun. 8, 2009

By Inderscience Publishers

Degradation kinetics of organic dyes in water by high voltage atmospheric air and modified air cold plasma

High voltage atmospheric cold plasma (HVACP) is a novel, non-thermal technology which has shown potential for degradation of various toxic components in wastewater. In this study, HVACP was used to examine the degradation kinetics of methyl red, crystal violet and fast green FCF dyes. HVACP discharge was found to be a source of reactive nitrogen and oxygen species. High voltage application ...

Apr. 21, 2017

By IWA Publishing

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