chromium treatment (Chromium Contamination

Utilisation of Andisols as possible low-cost adsorbent to remove Cr (VI) from aqueous solution

The potential of using Andisols to remove Cr (VI) from aqueous solution was evaluated by batch and column experiments. The results showed that the A-horizons (Isarog: 63%; Mandalagan: 42%) of the soils have lower adsorption capacity compared to B-horizons (Isarog: 93%; Mandalagan: 66%) using a dose of 20 g/L and Cr (VI) concentration of 10 mg/L. The adsorption capacity of B-horizons using column ...

Feb. 11, 2010

By Inderscience Publishers

Transportation and distribution of chromium in the anaerobic sludge treating the chromium-containing wastewater

The chromium distribution and transportation in the anaerobic activated sludge was investigated using a sequential extraction method. The results showed that Cr(VI) in aqueous solution was reduced by the metabolic product of SRB and form indissoluble Cr(OH)3 in a solid phase. More than 99% of Cr(III) in the sludge was in a stable residual form (RES) of bio-reduction. The Cr(VI) was mainly present ...

Jul. 20, 2009

By Inderscience Publishers

Role of low molecular weight organic acids on pyrite dissolution in aqueous systems: implications for catalytic chromium (VI) treatment

A systematic study combining batch experiments with spectroscopic analyses was carried out to better understand the effects of various organic acids on pyrite dissolution and subsequent Cr(VI) removal in aqueous systems. Our results suggest that organic acids had no effect on total Fe dissolution from pyrite relative to systems containing no acid. However, while nearly 100% of total Fe ...

Apr. 15, 2016

By IWA Publishing

Treatment of hexavalent chromium by using a combined Fenton and chemical precipitation process

This work aimed to remove hexavalent chromium and three treatment schemes were examined based on a laboratory scale design: (a) Fenton process, (b) precipitation process, and (c) Fenton process followed by precipitation process. Variations of this study including pH, Fenton and precipitation reagents (molar ratio of Fe2+/H2O2 and FeCl3), contact time, and initial concentration of ...

Nov. 20, 2013

By IWA Publishing

Evaluation of Ceraflow-50 as a Filtration Media for Hexavalent Chromium Treatment - Case Study

Project Description Pilot testing was conducted to evaluate the relative performance of 4 filter media, including Ceraflow-50, as part of a reduction coagulation filtration (RCF) treatment process for the removal of hexavalent chromium (Cr(VI)) from groundwater. This evaluation was conducted at multiple well sites for a water utility in California. The RCF process achieves Cr(VI) removal by ...

Jul. 12, 2019

By Wateropolis Corp.

Removal of trivalent chromium from dilute aqueous solutions and industrial effluents using Emulsion Liquid Membrane technique

This paper reports a study of batch extraction of trivalent chromium from dilute aqueous solutions as well as electroplating and tannery effluent by Emulsion Liquid Membrane (ELM) technique. An experimental study was performed to optimise the pH of the aqueous external phase based on distribution coefficient of solute between aqueous external phase and organic (membrane) phase. The batch ...

Dec. 3, 2009

By Inderscience Publishers

Electrochemical treatment of spent tan bath solution for reuse

A spent tanning bath contains high concentration of salts, chromium and protein. The treatment system for removal of chlorides or chromium from this effluent is expensive. In this context this waste has to be reused. Our study focuses on the application of advanced oxidation processes for protein removal present in a tanning bath. To improve the quality of the chromium tanning bath, two ...

Dec. 9, 2016

By IWA Publishing

Phytoremediation of chromium(VI)-laden waste by Eichhornia crassipes

The aim of the present investigation is to develop a suitable phytoremediation technology for the procumbent removal of chromium(VI) in tannery wastewater. Water hyacinth species, Eichhornia crassipes, was chosen to remediate chromium from synthetic wastewater. Present study revealed 88% Cr(VI) removal in synthetic wastewater sample within 48 hours of the study at all concentrations ranging from ...

Mar. 30, 2011

By Inderscience Publishers

Screening of few aquatic floating plants for chromium phytoremediation

Phytoremediation process using hydrophytes emerges as an attractive scientific and engineering tool for the attenuation of metal pollution in the aquatic environment particularly in secondary and tertiary levels of wastewater treatment. The selection of appropriate plants on the basis of maximum uptake potential for engineering application of the process is the key factor. The present study deals ...

May 29, 2014

By Inderscience Publishers

Use of chemically treated sawdust for chromium removal from aqueous solutions: effect of process parameters

This paper reports the effect of various process parameters on the removal of chromium from aqueous solution using formaldehyde–treated timber industry waste (sawdust). The adsorbent was characterised by Scanning Electron Microscopy (SEM) and Energy Dispersive X–Ray Analysis (EDAX). Influence of chromium concentration, pH, adsorbent dose and contact time on chromium removal from aqueous solution ...

Aug. 2, 2012

By Inderscience Publishers

Case study: How to purify Hexavalent Chrome Wastewater

We all talk about priority pollutants, about hazardous substances and discharge to the atmosphere etc. which are dangerous for our environmental. Day by day we adopt new laws and regulations to protect our green future. So, what is that “priority pollutants”? Priority pollutants are highly toxic chemicals. The list of these chemicals is quite large and includes thousands of items but ...

May 5, 2014

By GlobeCore GmbH

Waste water treatment, intensification of process

Among the various methods such as homogenizing, mixing, neutralization, sedimentation, filtering, ion exchange etc. ABC-100 PC GlobeCore production is machines with vortex layer and it is widely used for: · wastewater treatment from hexavalent chromium and other heavy metals (under the influence of electromagnetic field we can extremely reduce reagent consumption at the ...

Feb. 14, 2014

By GlobeCore GmbH

Abatement of Cr(VI) rich wastewater in a novel multistage External Loop Airlift Reactor using acidified activated carbon

In the present investigation, a multistage External Loop Airlift Reactor (ELALR) has been used for the treatment of Cr(VI) rich wastewater using acidified activated carbon as the adsorbent. The multistaging has been achieved by hydrodynamically induced continuous bubble generation, break-up and regeneration. The continuous rupture and bursting of bubbles creates localised turbulence and ...

Dec. 3, 2009

By Inderscience Publishers

Membrane contactors (NDSX and EPT): an innovative alternative for the treatment of effluents containing metallic pollutants

This work presents an overview of membrane–based solvent extraction technologies using membrane contactors as an innovative alternative for the remediation of effluents containing metallic pollutants. The discussion is focused on the description of Non–Dispersive Solvent Extraction (NDSX) and Emulsion Pertraction Technologies (EPTs). Three case studies are reported to demonstrate the viability of ...

Apr. 9, 2012

By Inderscience Publishers

Groundwater treatment with the use of zero-valent iron in the PRB Technology

The industrial dumping sites located in the southern provinces of Poland pollute the groundwater with metals. In the article, the possibility of groundwater (polluted by metals) treatment with the use of PRB Technology has been presented. In this technology, the contaminants are removed from the aquifer by the flow of the groundwater through a PRB filled with a special reactive material. The ...

May 17, 2013

By IWA Publishing

Effect of sludge age on heavy metal biosorption by selector activated sludge

The influence of sludge age on the metal biosorption characteristics of an aerobic selector-activated sludge was investigated. Two bench-scale aerobic-activated sludge systems were operated at sludge ages of 5 days and 15 days for studying biosorption of Cu and Cr(VI). In-vitro batch experiments were performed to compare biosorption characteristics of the sludge samples harvested from the ...

Oct. 17, 2008

By Inderscience Publishers

Usak Karma OSB - Case Study

Project name Usak Mixed Organized Industrial Zone Wastewater Treatment Plant Employer Usak Mixed Organized Industrial Zone Head of Entrepreneur Association Contractor Enta Muhendislik Antma Taah. San. Ve Tic. Ltd. Sti. Location of the plant Usak/TURKEY Scope of work Industrial and Domestic Wastewater Treatment Plant Contract Date 2005 Completion Date 2006 Flowrate of the plant:24.000 mJ/ ...

Nov. 5, 2018

By ENTA Treatment Systems Engineering Contracting Corporation

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 some heavy metal ions by local isolate of Zoogloea ramigera

Fourteen isolates of Zoogloea ramigera have been successfully isolated from organically polluted wastewater. The isolates were screened for their tolerance to three heavy metals (Cadmium, Chromium and Nickel) using plate diffusion method. Some of the isolates showed relatively high tolerance to the tested metals, while others showed a relatively low tolerance. These results are approved by a ...

Jul. 25, 2006

By Inderscience Publishers

Wastewater sterilization (purification): completely new method “vortex layer machine”

The purification and safe disposal (neutralization) of industrial waste water effluents represent a very important ecological problem. The principal problem or requirement involves reducing the concentration of harmful impurities to concentration levels below their maximum allowable concentration limits. In fulfilling this requirement the amount of fresh water consumption needed to maintain the ...

Jan. 22, 2014

By GlobeCore GmbH

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