toxic metals removal Articles

  • 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 ...


    By Inderscience Publishers

  • Application of novel consortium TSR for treatment of industrial dye manufacturing effluent with concurrent removal of ADMI, COD, heavy metals and toxicity

    The present study was aimed towards the effective bio-treatment of actual industrial effluent containing as high as 42,000 mg/L COD (chemical oxygen demand), >28,000 ADMI (American Dye Manufacturers Institute) color value and four heavy metals using indigenous developed bacterial consortium TSR. Mineral salt medium supplemented with as low as 0.02% (w/v) yeast extract and glucose ...


    By IWA Publishing

  • How To Handle Chemical Spills & Cleanups

    FAST-ACT is designed for liquid and vapor chemical releases, but the chemicals it attacks does not need to be limited to what we traditionally think of as a chemical spill. Toxic and noxious chemicals can come from a variety of sources such as waste water, decomposition, household chemicals, and animals. Since FAST-ACT can be applied to liquid spill or vapor release enabling Emergency Responders ...


    By Fast-ACT

  • Removal of ionic metals from wastewaters of COD determinations

    Chemical Oxygen Demand (COD) determinations generate highly disruptive waste streams with chromium, mercury and silver. These should follow specific waste management approaches in search of environmental and economical benefits, for which this work reports simple chemical procedures allowing toxic metal removal. Chromium(VI) is reduced to chromium(III) and total chromium is precipitated with ...


    By Inderscience Publishers

  • Hydrophobicity in biosorptive flotation for metal ion removal

    Several biological systems are known to explore the presence of micro-organisms and their ability to adsorb/bind toxic metals from liquid or solid wastes, a procedure termed biosorption or bioaccumulation. The mechanism of this process is often based on hydrophobicity. This physical-surface property is also the main parameter which, for this reason, should be investigated, for the specification ...


    By Inderscience Publishers

  • Comparative evaluation of collectors for metal removal by precipitation/flotation

    This paper describes a comparative evaluation of collectors for metal removal by precipitation/flotation in samples of wastewaters from an electroplating industry. Precipitation/flotation was found to be successful over a great range of pH (3-12). The toxic metal ions lead (II), nickel (II), tin (II), iron (II) and aluminium (III) were stripped from contaminated industrial samples to ...


    By Inderscience Publishers

  • Removal of heavy metals from aqueous solution by limestone

    This study focused on the removal of Pb(II), Cd(II), Cu(II), and Zn(II) using reagent solutions by natural limestone in a batch system. The sorbent, collected from the Late Cretaceous limestone beds, Tunisia, was characterised by X–ray diffraction (XRD), chemical analysis (XRF) and infrared spectroscopy (FTIR). XRF showed that the studied limestone contained high amount of calcium carbonates. XRD ...


    By Inderscience Publishers

  • Pilot testing of a membrane bioreactor for metals removal

    The City of Davis, California (City) Water Pollution Control Plant (WPCP) is facing stricter effluent permit requirements and compliance with the California Toxics Rule (CTR) effluent limitations. The impact of these requirements will necessitate upgrades to the existing WPCP to include conventional secondary and tertiary processes to control the discharge of biochemical oxygen demand (BOD), ...

  • Use of various agricultural wastes for the removal of heavy metal ions

    There is a need to develop innovative and alternative technologies that can remove toxic heavy metal pollutants from wastewater. In this study, two agricultural residues, cotton stalks and apricot seeds, were used to adsorb copper and lead in solutions. Sorption capacities of agricultural wastes were significantly affected by solution pH, adsorbent mass and adsorbent particle size. The adsorption ...


    By Inderscience Publishers

  • Arsenic Removal

    The Arsenic Removal ProcessArsenic, a naturally occurring element, is found throughout the environment; for most people, food is the major source of exposure. Acute (short-term) high-level inhalation exposure to arsenic dust or fumes has resulted in gastrointestinal effects (nausea, diarrhea, abdominal pain); central and peripheral nervous system disorders have occurred in workers acutely ...


  • TOXICITY AND METAL BIOACCUMULATION IN HORDEUM VULGARE EXPOSED TO LEACHED AND NON‐LEACHED COPPER AMENDED SOILS

    Soil leaching has been proposed as a way to reduce soil‐spiking artefacts (i.e., increased acidity, metal solubility) that occur in soils amended with trace metal salts. Leaching metal‐spiked samples prior to ecotoxicity testing is therefore expected to reduce toxicity, however, leaching not only removes excess amounts of the trace metal being tested, but also reduces the concentrations of ...


    By John Wiley & Sons, Ltd.

  • Removal of toxic elements from aqueous solution using bentonite modified with l-histidine

    This study proposes the use of bentonite modified with l-histidine for the removal of Cu, Co, Cr, Fe, Hg, Ni, U and Zn from aqueous solutions such as those impacted by acidic drainage. The surface areas of natural bentonite and bentonite–histidine were 73.8 and 61.2 m2 g−1, respectively. Elemental analysis showed an increase in the amount of carbon (0.258%) ...


    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 ...


    By IWA Publishing

  • Optimization of motor vehicle industries wastewater treatment methods with the aim of heavy metals removal and water reuse in pilot scale

    Virtues of industrial wastewaters completely depend on the type of process and products of the factory. Keeping this fact in mind, the greatest differences between industrial waste and municipal wastewaters could be as follow:  There is more possibility of existence of toxic chemical compound in the industrial wastewater. - It has more corrosive characteristic.  It conveys alkaline or acidic ...


    By University of Tehran

  • Removal of Lead from Gasoline

    On 12th March 1997, the European Commission adopted a proposal from the Environment Commissioner Ritt Bjerregaard on a European Union strategy to combat acidification. The strategy will, by 2010, reduce significantly the extent of the areas in the European Union where the tolerance of sensitive ecosystems to acidity is exceeded. Main elements of the strategy include establishment of national ...


    By The World Bank

  • Metals Stabilization Using Geochemical Fixation

    Introduction To Chemical Fixation There are several approaches to treatment of chromium and other toxic metals such as lead arsenic, and cadmium in soil and groundwater, including isolation, immobilization, toxicity reduction, physical separation, and extraction (U.S. EPA. 2002). Brief Overview Of Metals Remediation Methods: Conventional ...


    By Graus Chemicals, LLC

  • Innovative decoloration and removal of heavy metal ions of waste water in textile, leather and paper industry with SERA CON C-BOR / SERA CON C-RAP

    Decoloration of waste water with SERA CON C-BOR / C-RAP – an easy process Official Comments strongest reduction agent resulting in a rapid and complete decoloration of dyestuffs that are sensitive to reducing agents. decoloration is based on a decomposition mechanism, i.e. after decoloration the dyestuffs ...


  • 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

  • Mercury recovery from industrial waste and toxic residues of natural gas drilling

    econ's client in the east of Germany is one of the few specialised companies in Europe for the treatment of mercury contaminated waste. Typical input material for this type of treatment is sludge from the natural gas industry or other residues from chemical processes, i.e. contaminated filter cake from waste water treat-ment. Among their most important clients are Shell, ExxonMobil, Wintershall ...


    By econ industries GmbH

  • Metal ions biosorption from dilute aqueous solution

    Biosorption, using non-living biomass (mostly suspended), is briefly reviewed in this paper as applied to toxic metal ions removal, with particular focus on the kinetics and engineering considerations of the process. Several diverse kinetic models were successful in fitting the experimental data. Evidence was provided that the metal biosorption (on Aeromonas caviae biomass) is a complex process. ...


    By Inderscience Publishers

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