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Photodegradation of Textile Effluent Using Solar Radiation

Sharmin Yousuf Rikta
Department of Environmental Sciences, Jahangirnagar University, Savar, Dhaka, Bangladesh

Mahbub Alam
Department of Environmental Sciences, Jahangirnagar University, Savar, Dhaka, Bangladesh

Kaniz Fatima Binte Hossain
Department of Environmental Sciences, Jahangirnagar University, Savar, Dhaka, Bangladesh

Shafi Mohammad Tareq
Department of Environmental Sciences, Jahangirnagar University, Savar, Dhaka, Bangladesh and School of Biosciences, The University of Nottingham, Jalan Broga, Semenyih, Selangor Darul Ehsan, Malaysia

Abstract/ Executive Summary:

Recent study was carried out to examine the efficacy of solar radiation in improving the quality of textile effluent in term of physicochemical properties and to degrade the dissolved organic matter (DOM) in textile effluent. The experiment was performed in natural light with dark control and both the changes in physicochemical parameters and the DOM in textile effluent were examined. Physicochemical properties of textile effluent changed gradually after photodegradation in different time intervals and the effluent quality improved. Not all the parameters were in standard limit but the pollution load decreased substantially. After twenty days of photodegradation, fluorescent intensity of DOM in textile effluent decreased from 5.5 RU to 0.16 RU which indicated photo-oxidation of low molecular weight DOM, whereas dark control showed no significant change in DOM fluorescent intensity.

Keywords: Textile Effluent, Dissolved Organic Matter, Fluorescence, Photodegradation, Physicochemical Properties

Location: Textile industry which is located at Savar, Dhaka, Bangladesh

Start Date:

End Date:

Program Area: Risk Management in Agriculture

Commodity: Efluent

Objectives:

To find out the efficacy of solar radiation to degrade DOM and subsequent changes in physicochemical parameters in textile effluent.

Methodology:

Textile effluents for this research work were obtained from a textile industry which is located at Savar, Dhaka, Bangladesh. The sample contained wastewater from different production activities such as washing, dyeing, bleaching, printing etc. The samples were photodegraded by solar radiation for 20 days in natural radiation source. The approximate dose was six hours per day in the month of April. Physicochemical parameters of the samples were analyzed before and after irradiation. Measurements of irradiated samples were performed in four different time intervals which were five days, ten days, fifteen days and twenty days after photodegradation. Physicochemical properties such as pH and Total Dissolved Solid (TDS) were measured using pH meter (HM- 30P, pH Meter) and TDS meter (HANNA, HI 8734) respectively. Electrical Conductivity (EC), Dissolved Oxygen (DO) and turbidity were measured using EC Meter (CM- 31P), DO Meter (970 DO2 Meter, Jenway, UK) and Turbidity Meter (HANNA, HI 93703) respectively. Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) were measured using 5-Days BOD test and Closed Reflux Colorimetric method respectively. All the samples were filtered through glass-fiber membrane (0.45µm) to remove suspended materials that may react with DOM. The fluorescence intensity of DOM was determined on a Fluorescence Spectrophotometer (F- 4600, Hitachi, Japan). Excitation-Emission Matrices (EEMs) were created using FL Solutions software. Before analysis, DOM samples were diluted 100 times to keep the spectra within the upper limit of analysis. To generate an EEM, excitation wavelengths were scanned from 225 to 500 nm in 5 nm steps, and the emitted fluorescence detected between 240 and 600 nm in 2 nm steps. Excitation and emission slit widths were 5 nm. Scan speed was 1200 nm/min, permitting collection of a complete EEM in 18 min.

Source of Information: International Journal of Environmental Protection and Policy, 2015; 3(2-1): 14-18 ISSN: 2330-7528 (Print); ISSN: 2330-7536 (Online)

Article Link (Online Journal): doi: 10.11648/j.ijepp.s.2015030201.13

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Wastewater like textile effluent contain large amount of color (dyes), total dissolved solid, turbidity, pH, chemical and biochemical oxygen demand, dissolved organic matter etc which make it unsuitable for easy discharge and other uses. Study reveals that, photodegradation by solar radiation could be an effective mean to reduce such parameter after some preliminary treatments. Photodegradation is also effective to remove dissolved organic matter (DOM) which might be an inherent pollutant in textile effluent. Although photodegradation of textile effluent is beneficial, more effective removal might be achieved through the modification of this process (e.g., catalyst addition) which would increase the efficiency of the removal techniques.

Knowledge Management: Journal