wastewater metals treatment Articles

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 ...

Sep. 15, 2009

By Inderscience Publishers

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 ...

Aug. 2, 2012

By Inderscience Publishers

4 Benefits of Electrocoagulation for Heavy Metal Wastewater Treatment

There is much debate in academia, as to what elements should be considered “heavy metals”. Some criteria depend on density, some on atomic number, and some on chemical behavior. In the water treatment industry, we tend to concern ourselves with the more common and more toxic variety. Such heavy metals may include mercury, cadmium, lead, chromium, and copper. Arsenic is also ...

Jul. 17, 2019

By Genesis Water Technologies, Inc.

Biosorption kinetics and isotherms of copper (II) ions from aqueous solution and application of the MATLAB

In this study, biosorption kinetic and isotherm models were examined by the MATLAB for removal of copper ions from aqueous solution freely dead single Rhizopus arhizus and mixed dead waste sludge biomass. The copper ions removal efficiencies at equilibrium were 98%, 95% and 92% for freely dead R.arrhizus and two types of dead waste sludge. The experimental data fitted to pseudo-second order ...

Oct. 17, 2008

By Inderscience Publishers

Metal Machining Facility Wastewater Treatment Case Study

Effective Breaking of the Oil Emulsion in Machine Shop Wastewater This is the result of our Floccin 1105 product treating a sample from a Metal machining facility. The sample was at a pH of 9 and CO2 was added to bring the pH down to neutral (pH at 7). The Floccin 1105 was very effective at clarifying the waste, breaking the strong oil emulsion and capturing the oil. The dosage was minimal ...

May 24, 2012

By Integrated Engineers Inc.

Metal Processing Facility 1 Wastewater Treatment

Integrated Engineers, Inc. conducted the below treatability on a Metal Processing facility that uses soluble machine coolants in their machining process; below are the ...

Jan. 29, 2009

By Integrated Engineers Inc.

Removal of Ni2+ from aqueous solution by rice bran

Rice bran, an agricultural by-product, was used for the sorptive removal of Ni2+ from aqueous solutions. Batch adsorption experiments were performed as a function of initial concentrations, contact time, pH and temperature. The experimental data were analysed by Langmuir, Freundlich and Redlich-Peterson isotherms. The equilibrium sorption capacity of Ni2+ was determined from the Langmuir equation ...

Oct. 17, 2008

By Inderscience Publishers

Use of aquatic plants in removing heavy metals from wastewater

Phytotechnologies involving use of plants for pollutant removal gained importance during the last two decades. Terrestrial and aquatic plants possess high metal sorption capacity, and hence find their use as inexpensive materials for removing metals from environment. Aquatic biomass irrespective living or dead, exhibits capacity to remove heavy metals from wastewater. The sequestration of heavy ...

Dec. 3, 2009

By Inderscience Publishers

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. ...

Oct. 17, 2008

By Inderscience Publishers

Removal of COD, colour and heavy metal from wastewater using electro–chemical technique

The effects of applied electric charge (0–200 Amp–min) and pH on the removal of colour and COD from textile wastewater have been analysed. Mild steel plates have been used as electrodes in both parallel and series connections. For colour and COD removal, four electrodes each with a surface area of 177.3 cm² and with inter–electrode distance of 2.3 cm in parallel connection ...

Oct. 28, 2013

By Inderscience Publishers

Biosorption of chromium(VI), nickel(II) and Remazol Blue by <italic>Rhodotorula muciloginosa</italic> biomass

Biosorption of chromium(VI), nickel(II) and Remazol Blue by Rhodotorula muciloginosa biomass

The passive removal of commonly used reactive dye and two heavy metals, from aqueous solutions by inexpensive biomaterial, yeast Rhodotorula muciloginosa biomass, termed biosorption, was studied with respect to pH, initial dye concentration and initial metal ion concentration. The biomass exhibited maximum dye and chromium(VI) uptake at pH 5 and pH 6 for nickel(II) in media containing 50 mg/L ...

Jan. 1, 2012

By IWA Publishing

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 ...

Oct. 17, 2008

By Inderscience Publishers

Metal Processing Facility 3 Wastewater Treatment

Treatability Procedure 1) Mix samples with regular and chrome laden stream to obtain a 7% by volume chrome to regular wastewater blend. Used a 2,000 ml sample 2) Initial pH = 9.5, Conductivity = 3,4250 uS, ORP = +55.9 mV 3) Add IE-061 (10% solution) for a total of 0.3ml of neat product to an ORP of –163 mV. 4) PH still at 9.5, added Carbon dioxide gas to a pH of 7.0 Sample was buffered ...

Jan. 29, 2009

By Integrated Engineers Inc.

Biosorption of lead(II) by free and immobilised fungal biomass of Phanerochaete chrysosporium: a comparative study

An efficient metal biosorbent was developed by immobilising fungal biomass within matrix of loofa sponge (FBILS). At biosorption equilibrium FBILS removed 137 mg Pb(II) g-1, which was 24.3% greater than 110 mg Pb(II) g−1 free fungal biomass. The equilibrium biosorption data fitted well the Langmuir model. The experimental data, when applied to the pseudo-first and second-order kinetic models, ...

Oct. 17, 2008

By Inderscience Publishers

VSEP treats metal plating wastewater with no chemical addition and a filtrate well below MP&M discharge limits

A discussion of the suitability of New Logic’s patented V✧SEP Vibratory Membrane Filtration System in the treatment of wastewater from metal plating operations. Timely discussion covers the upcoming MP&M (Metal Plating and Manufacturing) regulations being formulated by the EPA as a result of the Clean Water ...

May 31, 2007

By New Logic Research, Inc.

Copper-spent activated carbon as a heterogeneous peroxydisulfate catalyst for the degradation of Acid Orange 7 in an electrochemical reactor

The exhausted activated carbon generated from the adsorption of heavy metal wastewater needs further treatment/disposal. In this study, a new application of copper-spent activated carbon (Cu-AC) was proposed. Cu-AC was used to activate peroxydisulfate (PDS) for the decolorization of Acid Orange 7 (AO7) and electrical current was introduced to enhance the process. The decolorization followed a ...

Jan. 18, 2016

By IWA Publishing

Integration of polyelectrolyte enhanced ultrafiltration and chemical reduction for metal-containing wastewater treatment and metal recovery

Chemical reduction was firstly employed to treat synthetic wastewaters of various compositions prepared to simulate the retentate stream of polyelectrolyte enhanced ultrafiltration (PEUF). With fixed Cu:polyethylenimine (PEI) monomer:dithionite molar ratio, increasing copper concentration increases copper removal efficiency. Under fixed Cu:dithionite molar ratio and fixed Cu concentration, ...

Jun. 17, 2015

By IWA Publishing

Integration of polyelectrolyte enhanced ultrafiltration and chemical reduction for metal-containing wastewater treatment and metal recovery

Chemical reduction was firstly employed to treat synthetic wastewaters of various compositions prepared to simulate the retentate stream of polyelectrolyte enhanced ultrafiltration (PEUF). With fixed Cu:polyethylenimine (PEI) monomer:dithionite molar ratio, increasing copper concentration increases copper removal efficiency. Under fixed Cu:dithionite molar ratio and fixed Cu concentration, ...

Jun. 17, 2015

By IWA Publishing

Removal of Ni(II) from electroplating rinse waters using cation-exchange resins: batch and column studies

The adsorption of Ni (II) from nickel electro plating rinse water has been attempted. Indion 225 and Dueolite C 20 cation-exchange resins through batch and column mode for the recovery of Ni (II), which showed a remarkable increase in sorption capacity. On the basis of isotherm analysis, more efficient adsorbent is chosen for column mode adsorption studies. The continuous-flow study was to ...

Oct. 1, 2010

By Inderscience Publishers

Effects of metal ions on biomass and 5-aminolevulinic acid production in Rhodopseudomonas palustris wastewater treatment

This work investigated the effects of eight metal ions on Rhodopseudomonas palustris growth and 5-aminolevulinic acid (ALA) yield in wastewater treatment. Results show that metal ions (Mg2+ of 15 mmol/L, Fe2+ of 400 μmol/L, Co2+ of 4 μmol/L, Ni2+ of 8 μmol/L and Zn2+ of 4 μmol/L) could effectively improve the chemical oxygen demand (COD) removal, Rp. palustris biomass and ALA yield. The ...

Oct. 1, 2015

By IWA Publishing

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