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Dyes Removal from Textile Wastewater Using Orange Peels

Fahim Bin Abdur Rahman
School of Environmental Science and Management, Independent University, Bangladesh, Dhaka-1229, Bangladesh

Maimuna Akter
School of Environmental Science and Management, Independent University, Bangladesh, Dhaka-1229, Bangladesh

M. Zainal Abedin
School of Environmental Science and Management, Independent University, Bangladesh, Dhaka-1229, Bangladesh

Abstract/ Executive Summary:

Use of various dyes in order to color the products is a common practice in composite knit industry. The presence of these dyes in water even at low concentration is highly visible and undesirable. This study was carried out for the utilization of orange peel as adsorbent for the removal of dyes from wastewater and to establish it as a standard wastewater treatment process for composite knit industry. This experiment was performed in the laboratory scale. The materials were obtained and treated for the removal of dyes at different doses. These materials also evaluated for different pH and contact time. This batch adsorption experiment was carried out for finding the effects of adsorbent’s amount, pH and retention time on the removal of dyes from the wastewater. The experiment showed that the removal percentage was 60-70% at pH=7 with a retention time of 120 minutes. The optimum dose amount of adsorbent was 1.5g/25mL. The equilibrium adsorption behavior was examined by applying Langmuir adsorption isotherm model. The adsorption capacity of orange peel is low but comparable to the other available adsorbents.

Keywords: T Wastewater characterization, Wastewater treatment, Orange peel, Removal efficiency

Location: In Bangladesh

Start Date:

End Date:

Program Area: Resource Development and Management

Commodity: Orange, Efluent

Objectives:

Orange peel is largely composed of cellulose pectin; hemi-cellulose, lignin and other low molecular weight compounds including limestone. It can be used as an efficient and cost effective bio-adsorbent for removing dyes metals and organic pollutants from industrial wastewater. In addition orange peel is alternative as a adsorbent for its abundance in nature, non-toxicity and bio-degradability. This study was performed to utilize the orange peel as a low cost natural adsorbent with respect to various parameters such as different doses, contact time and pH.

Methodology:

2.1 Sample and Adsorbents Collection The sample wastewater was collected from Sharp Knitting & Dyeing Limited situated in Pagar, Tongi. The sample contains three different reactive dyes: Golden yellow, Black B and Red 6BL. The adsorbents used for this study is orange peel. Orange peels were collected from local fruit stall.

2.2 Preparation of Adsorbents Orange is used mainly in orange-juice and soft drinks industries all over the world. They discard a huge amount of orange peels. These discarded peels can be used as an adsorbent for the removal of dyes from the wastewater. Waste orange peel was obtained from a fruit stall. At first, the peels were cleaned with distilled water to remove dust particles and water-soluble impurities. After that, these were cut into small pieces, dried in sunlight for 2 days until the peels become crisp. Then using mortar until uniform size particle was obtained grounded the peels. Finally the grounded peels were packed in airtight container and labeled.

2.3 Preparation of Standard Solution Deazol Black B EAN reactive dye is very common in textile industries. Stock solution was prepared by dissolving accurately 0.1g-weighed quantity of the dye in 1L-distilled water. Later, desired amount of solutions were taken from the mother solution and diluted using distilled water. pH was adjusted by adding 0.1M NaOH solution and 1M acetic acid solution.

2.4 Batch Adsorption Study In this experiment, a batch adsorption technique was used. To study the effects of various important parameters such as amount of adsorbent, pH values, the contact time between adsorbate and adsorbent. 25 ml of sample wastewater was taken from 100ml airtight flask. A desired amount of adsorbent then added to the sample. This experiment was carried out at room temperature. The solutions were then subjected to a magnetic stirrer for proper adsorption. Samples were withdrawn from the stirrer at different time intervals. Then the adsorbents were separated from the sample by using filter paper. The absorbance was measured for a supernatant solution using UV-Spectrophotometer. The final concentration of dye was estimated with the help of these absorbance data. For determining the uptake of the dye, all-inclusive sets of experiments were performed at different time intervals (30, 60, 90, 120, 150 and 180 minutes) and pH (2~9) etc.. A range from 0.5g to 2.0g of adsorbent was also used to perform this experiment.The amount of adsorption at equilibrium time, qe(mg/g) was calculated.

Where, C₀ for the liquid-phase concentrations of dye at initial (mg/L); C_e, for the liquid-phase concentrations of dye at equilibrium (mg/L); V represents the volume of the solution, (L); W =mass of dry adsorbent used, (g).

Source of Information: INTERNATIONAL JOURNAL OF SCIENTIFIC & TECHNOLOGY RESEARCH VOLUME 2, ISSUE 9, SEPTEMBER 2013 ISSN 2277-8616

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From this study, it may be concluded that the removal of various dyes from textile wastewater by adsorption on orange peels has been found to be useful for controlling water pollution due to dyes. From this experiment it is clear that, the adsorption of dyes onto orange peels is influenced by pH values, amount of adsorbents and contact time. Also, the adsorption of dyes onto orange peels follows the Langmuir isotherm model. In the review the efficiency of orange peels as an adsorbent has been studied. For higher removal of dyes from textile effluents adsorbent dose of 1.5g was favorable. The uptake of the dye increased with increasing contact time and the optimum contact time was obtained at 2 hours. Also, the adsorption was found to be higher for pH 7. From this research work it can be concluded that, the experimental data are well described by Langmuir isotherm model. Even though the removal efficiency of orange peels is not much higher than other bio-adsorbents, it is cheaply available. With this cheap and environment-friendly adsorbent, considerable dye removal can be achieved. So it can be a substitute other expensive bioadsorbents. With the experimental data obtained in this study, it is possible to design and optimize an economical treatment process for the dye removal from industrial effluents.

Knowledge Management: Journal