wastewater toxicity Articles
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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, ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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, ...
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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 ...
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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 ...
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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: ...
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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) ...
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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 ...
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Analysis of the contributions of pollution to industrial discharge categories in Korea using the Modified Toxic Weighting Factor
In 2007, 45,163 domestic industrial direct/indirect discharge sources were registered in Korea, which have been categorized into 82 divisions based on the characteristics of their products, raw materials and wastewaters. The purpose of this study was to set priorities using a risk assessment of pollutants toxic weighting for each industrial category with respect to pollution prevention and ...
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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 ...
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Painting Wastewater Treatment in Chemical and Automobile Industry
The treatment of painting processes wastewater in the chemical, plastic and automobile industries can be a real challenge. Many companies in this industry use high quantity of paint and surrogates for colouring, coating and surface treatment processes. ⚠ After painting, these surfaces need to be washed and rinsed, thus creating wastewater with highly toxic pollutants. ✔ In this article we ...
By YASA ET
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Comparison of Chemical Composition and Toxicity of Wastewaters from Pulp Industry
Abstract : Wastewaters from different pulp-making processes contain various organic and inorganic compounds : wood-derived, process chemicals and compounds generated during the reactions between the chemicals and raw materials. Carbohydrates and lignin-derived compounds constitute the main groups of components that cause oxygen demand in wastewater (COD), but they have rather low toxicity. Among ...
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