Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Electrocoagulation (ec) Technique for Color Removal from Orange Ii Dye

S. M. Nazrul Islam*
Department of Environmental Sciences, Jahangirnagar University, Savar, Dhaka, Bangladesh

Syed Hafizur Rahman
Department of Environmental Sciences, Jahangirnagar University, Savar, Dhaka, Bangladesh

Tanveer Mehedi Adyel
Department of Environmental Sciences, Jahangirnagar University, Savar, Dhaka, Bangladesh

Md. Sabbir Ahmed
Department of Environmental Sciences, Jahangirnagar University, Savar, Dhaka, Bangladesh

Riffat Ara Yesmin
Department of Environmental Sciences, Jahangirnagar University, Savar, Dhaka, Bangladesh

Md. Mahbubur Rahman
Department of Environmental Sciences, Jahangirnagar University, Savar, Dhaka, Bangladesh

Nowrine Kaiser
Department of Environmental Sciences, Jahangirnagar University, Savar, Dhaka, Bangladesh

Abstract/ Executive Summary:

Electrocoagulation (EC) is an electrochemical method of treating polluted water whereby sacrificial anodes corrode to release active coagulant precursors into solution. Present work was carried out to remove color from Orange II dye by EC technique. Iron sacrificial anode was used and 30V electricity for 30 minutes was applied for different concentration of Orange II dye. Color removal efficiency varied from 65 to 92% for dye concentration ranging from 10 to 60 ppm. Total operating cost was only 50 taka/m3 for solution containing 60 ppm of Orange II dye. So, EC was might be potentially viable and relatively inexpensive tool for removal of textile dye.

Keywords: Textile industry, Sacrificial anode, Operational cost, Azo-dyes, Electrolytic oxidation.

Location: In Bangladesh

Start Date:

End Date:

Program Area: Risk Management in Agriculture

Commodity: Efluent, Textile industry

Objectives:

Present study aimed to remove color from Orange II dye by EC technique using iron sacrificial anode and to examine overall operational costs. For simplification, the work was done without changing electricity voltage, contact time, pH of the solution and electrode distances etc.

Methodology:

Experimental Method Experiments were carried out in a pyrex glass beaker of 500 ml. Iron electrodes of (4×1×0.05) cm with a distance of 2.5 cm were used. The anode was connected with a voltmeter that gives voltage. A voltage stabilizer and an ammeter were used to regulate the flow of electricity and examine the current flow, respectively. The electricity was measured in every five minutes and it was averaged to get the exact value in mA. Before use, the electrodes were cleaned manually by abrading with sandpapers and then washed with dilute acid to remove impurities on the metal surface. The Orange II dye was collected from Ajmari Washing Plant, Dhaka, and used without any further treatment. Six standard solutions of dye wastewater containing Orange II were prepared by using distilled water. The pH of the solutions was measured before and after each experiment. In a typical EC experiment, the dye solution was taken in the EC cell for treatment for 30 minutes at 30 V. The absorbance of the dye solution in the treated sample was recorded at 485 nm (λmax) by a UV-Visible Spectrophotometer (Shimazu 1240, Japan) and the concentration was determined from the previously constructed calibration chart using Beer–Lambert’s law (Equation 1): A = εbc where, A is absorbance (A = log10 Ii/Io), ε is the molar extinction coefficient (L/mol cm), b is the path length of the sample (cm), c is the concentration of the solution (mol/l). A good linear relationship of A versus c was obtained. The color removal efficiency (% RE) was calculated from equation (2). % RE = [(Co – Cf) / Co] × 100 (2) where Co and Cf are the concentrations of the dye before and after the experimental, respectively. For the EC technique main operational costs included electricity and electrodes cost and for present work the overall operational costs were calculated using equations 3 to 5 (after Ghosh et al. 2008).

Operating Cost = aC_energy + bC_electrode (3) Cenergy = UIt_EC/v (4) C_electrode=M_WIt_EC/zFv (5) where, U is cell voltage (V), I is current (A), t_EC is time of EC (h), v is volume of sample (m³), F is the Farady’s constant (96487 C/mol), MW is molecular weight of iron (55.85 g/mol), z is number of electron transferred (z =1), a is electricity energy price (2.64 taka/kWh) and b is electrode material price (50 taka/kg iron).

Source of Information: Bangladesh Journal of Environmental Research, Vol. 9, 45-52, 2011 ISSN: 1996-891

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Synthetic wastewater solutions with strong colors were prepared in the laboratory using Orange II dye. EC technique was applied to remove the color from the dye solution. Color removal efficiency varied from 65 to 92% for solutions containing dye concentrations of 10 to 60 ppm. The higher treatment or color removal efficiency was considered due to chemical coagulation involving maghemite (γ-Fe2O3) and/or magnetite (Fe3O4) produced in the system as well as electrooxidation. The operating cost of this technique for the treatment of 1 m3 of wastewater in the aforementioned ranges was only 50 taka. So, since the EC apparatus was simple in design and operation, it can be used as a potentially viable and inexpensive tool for the treatment of textile dye.

Knowledge Management: Journal