Efficiency of the coagulation/flocculation method for the treatment of dyebath effluents (original) (raw)
Related papers
Pretreatment of Reactive Dye from Textile Wastewater by Coagulation Technology
2016
A physicochemical treatment was applied to study on removal of commercially used reactive dye and investigate the effectiveness of coagulation-flocculation from textile wastewater. Three types of coagulants were used like aluminium sulphate (alum), polyaluminium chloride (PAC), and magnesium chloride (MgCl2). Polyelectrolyte, Koaret PA 3230 was used as the coagulant aid. The coagulant dosage between 400 ppm to 5,000 ppm was studied using jar test. The changes of pH, types and dosage of coagulant, and the addition of coagulant aid on the percentage removal and the concentration of the dyes were determined through colour point. The results show that up to 90% colour removal for reactive dye could be achieved using alum of concentration 6,000 ppm and pH 2.4. Meanwhile, 99 % colour removal could be achieved using MgCl2with concentration of 4,000 ppm and pH 10.4, whereas 100% colour removal could be achieved using PAC with concentration of 2,000 ppm and pH 4.1. Among the coagulants used, PAC was the most effective coagulant in treating each dye, with the colour removal up to 100% at the dosage of 800 ppm. The flocs settling time for the treatment with MgCl2 was shorter than the treatment with PAC and the treatment with Alum was longer than the treatment with MgCl2 and PAC. This result can contribute some knowledge on the use of effective coagulants in treating textile industrial wastewater.
Technology Removal of Reactive Dyes Using Different Coagulants for Textile Wastewater
2015
Effluents of large variety of industries usually contain important quantities of dyes. The discharge of these colored compounds in the environment causes considerable non-aesthetic pollution and serious health-risk factors. Since conventional wastewater treatment plants cannot degrade the majority of these pollutants, powerful methods for the decontamination of dyes wastewaters have received increasing attention over the past decade. In this report a general review of efficient coagulation technology is developed to decolorize and/or degrade dyeing effluents for environmental protection. The effect of coagulant dosage and pH of wastewater on the color removal was examined, and the % of color removal results treated by different doses of coagulants like alum, ferric chlorite and ferrous sulphate at constant contact duration (4 hours), optimum pH from 6-8 using more coagulant doses and room temperature.Color removal percentage reduction (maximum) corresponds to 75.0 % to 85.0% , on re...
REMOVAL OF REACTIVE DYES USING DIFFERENT COAGULANTS FOR TEXTILE WASTEWATER
Effluents of large variety of industries usually contain important quantities of dyes. The discharge of these colored compounds in the environment causes considerable non-aesthetic pollution and serious health-risk factors. Since conventional wastewater treatment plants cannot degrade the majority of these pollutants, powerful methods for the decontamination of dyes wastewaters have received increasing attention over the past decade. In this report a general review of efficient coagulation technology is developed to decolorize and/or degrade dyeing effluents for environmental protection. The effect of coagulant dosage and pH of wastewater on the color removal was examined, and the % of color removal results treated by different doses of coagulants like alum, ferric chlorite and ferrous sulphate at constant contact duration (4 hours), optimum pH from 6-8 using more coagulant doses and room temperature.Color removal percentage reduction (maximum) corresponds to 75.0 % to 85.0% , on reactive dyes The efficiency of color removal increased with increasing coagulant dose
Dye Wastewater Treatment: Removal of Reactive Dyesusing Inorganic and Organic Coagulants
I Control Pollution, 2014
Wastewater treatment in textile and dye industry mainly involves treatment of highly colored wastewater containing variety of dyes in different concentrations. The wastewater needs to be treated prior to discharge by effectively removing dye color in order to protect environment and as per the statutory guidelines. Coagulation is the most commonly used method in the treatment of textile wastewater. In the present work, we report experimental work on treatment of synthetic waste containing pure reactive dyes, removal of reactive blue dye, using various commercial coagulants such as alum, polyaluminium chloride (PAC), polydiallyldimethylammonium chloride (poly-DADMAC) and polyamines. The optimum coagulant dose and pH values were determined for these inorganic and organic coagulants by comparing color removal efficiency. It was found that for inorganic coagulant PAC, the color removal was near total at concentration of 200 ppm and above, whereas for alum much higher dosage was needed (...
ORIGINAL ARTICLE Introduction: Since some dyes and their metabolites have toxicity and carcinogenicity potential, and are dangerous to the health of different living creatures, discharge of untreated wastewaters containing large concentrations of dye compounds into water resources is one of the important environmental problems. Therefore, in this research, the efficiency of chemical coagulation process was investigated using ferric chloride coagulant to remove Direct Red 23 dye from colored wastewater. Materials and Methods: In the experiments, a Jartest device was used and the effect of different parameters including the dose of the coagulant (20-200 mg/L), pH (3-10), and initial concentration of the dye (25-200 mg/L) on the efficiency of chemical coagulation process for removal of the dye was examined. Further, the final pH of the wastewater was investigated and the optimal conditions were determined. Results: The results indicated that the optimal dose of ferric chloride coagulan...
Applicability of chemical process in textile dye wastewater treatment
2015
The rapid growth of textile industries creates environmental pollution, mainly surface water pollution of effluent from textile dying and washing units. In Bangladesh many industries having ETP are not properly used for wastewater treatment due to excessive operational and maintenance cost. As a result, textile industries dump effluent directly into the surface water body without considering the effect on aquatic life as well as human. The principal objective of this thesis was to determine the advantages and limitations of chemical processes in textile dye waste water treatment. Different coagulations like Alum, FeSO4 were applied to select suitable ones with optimum removal efficiency. Laboratory scale model studies and field performance have been observed to optimize treatment processes. In this research chemical unit processes are more efficient and provide satisfactory performance in combination with physical and biological process than alone. Reduction of color is satisfactory...
—A textile is the major source of water consumption and waste water pollution, there are various treatment techniques to remove color and waste water textile pollution. Coagulation flocculation is the widely used method to remove pollution from textile due to suspended particles .in this research the two coagulant were selected that is Alum and ferric chloride in order to select the suitable ones with optimum removal effiency in terms of color. the research shown that When the PH is varied it has been seen that improved color removal were obtained by reducing the PH to 5.0 also it has been observed that at PH 5.0 the incremental increase of PH is 78% and lowest value was at 48% in case of Alum and in the case of Fecl3 the maximum percentage removal for color removal was 79-80%.Color is the main attraction of any fabric no matter how excellent its constitution, if unsuitably colored it is bound to be a failure as a commercial product. Sustainability of the environment has become a focus; hence the need for improvement and monitoring of textile waste water discharges, for which major concern is color. Color in textile dyeing and finishing effluents is as a result of large amounts of dye stuffs left during the dyeing stages and inefficient dyeing processes often resulting in unfixed forms.
Removal of Colour from Textile Wastewater Using Two- Step Coagulation Process
2014
The waste water from the textile dyeing industry pr oduces large amount of coloured water and this need s to be treated before discarding in the ecosystem. There a re various treatment technologies to remove colour from this wastewater which includes the most primitive yet ef fective method of coagulation-flocculation. In this research, inorganic coagulants like Alum (t rivalent) and ferrous sulphate (bivalent) were appl ied on commercial dyes Congo Red and Direct green 41 at different pH values of 8,9,10. Various parameters suc h as colour removal percentage, pH changes, TDS (Total Dissolved Solids), settled sludge volume has been evaluated . It has been estimated that though FeSO4 is the bett er coagulant for colour removal but somehow it prod uced an anesthetic colour to the residual water in compa rison to Alum. Moreover Congo red being less complex in structure is removed more effectively than Direct green 41.
International Journal of Integrated Engineering, 2019
Large quantities of dyes are currently being used in fabric and textile industries. High concentrations of COD (150-10 000 mg/ L) and colours (50-2500 pt. co) are released in the effluent as the end product [1]. Therefore, it is a compulsory for the fabric and textile industry to undergo wastewater treatment as either a physical, chemical or biological process to maintain the quality of water as stated by Environmental Quality Act 1974 (Act 127). Concerns
Application of Chemical Coagulation Process for Direct Dye Removal from Textile Wastewater
2017
1 Environmental Science and Technology Research Center, Department of Environmental Health Engineering, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. 2 Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran. 3 Center for Solid Waste Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran. 4 National Institute of Health Research, Tehran University of Medical Sciences, Tehran, Iran.