Treatment of wastewater contaminated with dyes using modified low-cost adsorbents (original) (raw)
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Treatment Treatment of wastewater contaminated with dyes using modified low-cost adsorbents
Desalination and Water Treatment Journal, 2019
The present study was designed to investigate the removal of three reactive dyes: Reactive Blue (RB), Reactive Red (RR) and Reactive Yellow (RY) from simulated textile wastewater in single and mixed (ternary) systems using adsorption process. Modified low-cost adsorbents: rice husk (RH), saw dust (SD) and sewage sludge (SS) in addition to granular activated carbon were used as adsorbents. RH was found to have a high removal efficiency. Batch experiments were achieved to study the effects of pH, dosage, contact time and initial concentration onto adsorption process using RH. The optimum conditions were found to be 2, 3 g, 150 min and 50 mg/L, respectively. The maximum removal efficiency was 95.77%, 89.26% and 80.36% for RB, RR and RY, respectively, for single system. Adsorption isotherms and kinetic models had been used to fit the experimental data. From which Langmuir and pseudo-second-order models were found to be having high correlation coefficient for the three dyes.
Study of Effect of Concentration on Adsorption of Methyl Red Dye using different Adsorbents
International Journal for Research in Applied Science and Engineering Technology, 2017
Textile processing industries are now widespread sectors in many developing countries. Among the various processes in the textile industry, dyeing process uses large volume of water for dyeing, fixing and washing processes. Thus, the wastewater generated from the textile processing industries contains suspended solids, high amount of dissolved solids, un-reacted dyestuffs (colour) and other auxiliary chemicals that are used in the various stages of dyeing and processing. The conventional method of textile wastewater treatment consists of chemical coagulation, biological treatment followed by activated carbon adsorption. However, wastewater containing dyes is very difficult and complex to treat, since the dyes are recalcitrant organic molecules, resistant to aerobic digestion, and are stable to light, heat and oxidizing agents due to their molecular structure and size. Adsorption techniques have gained popularity in recent years because of their proven efficiency in the removal of po...
A review on adsorbent parameters for removal of dye products from industrial wastewater
IWA, 2021
Industrial effluents are usually one of the major industries polluting the environment and surface water. It is estimated that the worldwide production of dyes is about 70 tons/year. To overcome this problem, innovative processes are suggested for the treatment of industrial effluents containing dyes and heavy metals. The goal of the processes is often to reduce the toxicity of these pollutants in order to meet treatment standards. Recently, great attention has been paid to innovative processes for physical and chemical removal techniques such as adsorption on new adsorbents, biomass adsorption, membrane filtration, irradiation, and electrochemical coagulation. In this study, the application of adsorbents in the adsorption process to remove dye pollutants from industrial effluents has been studied. Factors affecting dye adsorption such as pH, temperature, initial dye concentration, and adsorbent amount are also presented. The obtained results revealed that more than 80% of the dye adsorption on the surface of adsorbents are endothermic processes and more than 95% of the processes obey the pseudo-second-order kinetic model.
The reuse of dried activated sludge for adsorption of reactive dye
Journal of Hazardous Materials, 2006
Adsorption processes are alternative effective methods for removal of textile dyes from aqueous solutions. The adsorption ability of adsorbent affects by physico-chemical environment for this reason in this paper effect of initial pH, dye concentrations, temperature and dye hydrolyzation were determined in a batch system for removal of reactive dye by dried activated sludge. The Langmuir isotherm model was well described of adsorption reactive dye and maximum monolayer adsorption capacity (at pH 2) of activated sludge was determined as 116, 93 and 71 mg g −1 for 20 • , 35 • and 50 • C, respectively. Initial pH 2, 20 • C and 30 min contact time are suitable for removal of reactive dyes from aqueous solutions. Activated sludge was characterized by FT-IR analysis and results showed that active sludge has different functional groups and functional groups of activated sludge are able to react with dye molecules in aqueous solution. The pseudo first-order, second-order and intraparticle diffusion kinetics were used to describe the kinetic data. The pseudo second-order kinetic model was fit well over the range of contact times and also an intra particle diffusion kinetic model was fit well but in the first 30 min. The dye hydrolyzation was affected adsorption capacity of biomass and adsorption capacity of biomass decreased with dye hydrolyzation from 74 to 38 mg g −1 .
Removal of Dyes from Wastewater using Adsorption -A Review
The adsorption process is being extensively used for the removal of dyes from synthetic dyehouse effluents by various researchers. The most widely used adsorbent is commercially available activated carbon. Despite the frequent use of adsorption in wastewater treatment systems, commercially available activated carbon remains an expensive material. In recent years, the safe and economical methods are required for the treatment of dyehouse effluents, which involved researchers to focus towards the preparation of low cost adsorbents from cheapest sources. Therefore, in this review article, the different cheapest sources of preparing adsorbent are discussed and their feasibility in treating dyehouse effluents is studied. INTRODUCTION Dyeing industry is one of the largest water consuming industries. The effluent coming out of the dyeing industries contains various chemicals and colouring compounds and the effluent requires proper treatment before it is discharged into any water body. But,...
Removal of Dyes From Wastewater by Adsorption Onto Low-Cost Adsorbents
Impact of Textile Dyes on Public Health and the Environment, 2020
This chapter describes an up-to-date critique of the use of adsorption as a wastewater treatment technique for the removal of dyes. The topics range from the classification of dyes, their occurrence in water and toxicity, various treatment methods, and dye adsorption dynamics onto agricultural wastes and inorganic adsorbents such as clay and metal oxides and adsorption onto microbial biomass under varying operational conditions. It is demonstrated that the discussed materials form alternative adsorbents for dye adsorption from aqueous solutions with comparable or better removal efficiencies relative to the non-renewable coal-based granular activated carbons; they are cheap and abundant. The relative performance of the adsorbents under different environmental parameters for dye removal has also presented. The deductions made and alluded to from various kinetic and adsorption isotherm models are also discussed. The chapter presents the past, present, and suggestions for future conside...
Application of ecological adsorbent in the removal of reactive dyes from textile effluents
Journal of Chemical Technology & Biotechnology, 2009
BACKGROUND: The capacity and mechanism of adsorption of the reactive dyes monoazo (RR2) and diazo (RR141), using a new adsorbent with a strong ecological appeal developed from the sludge of the textile effluent treatment process, were investigated. The kinetics and adsorption isotherms were determined at different temperatures and salt concentrations. After determination of the best experimental conditions for adsorption for both dyes, tests were carried out in fixed-bed adsorption columns.
DESALINATION AND WATER TREATMENT, 2018
This work shows the adsorption study of a dye mixture onto rice husk (RH) by means of the firstorder derivative spectroscopy under a batch system, for which the anionic dye Red 40 (R40) and vat dye Indigo Blue (IB) were selected. This work shows for the first time the use of RH for the adsorption of a dye mixture formed by R40 and vat dye IB. The first-order derivative spectroscopy and analysis under a batch system were implemented. In order to establish the best conditions for the removal of these pollutants, a 2 3 full factorial design was initially carried out for each individual dye and then a 2 4 full factorial design for their mixture. Likewise, the equilibrium of the process was evaluated, taking into account the dyes as both mono-component systems and as part of the binary mixture, finding that Langmuir isotherm model is the one that offers the best fit for the experimental data of R40 (R 2 = 0.987) and IB (R 2 = 0.989), while competitive Langmuir model is the most suitable for the multicomponent system. As for the kinetics, the pseudo-second-order model shows the best fit for R40 (R 2 = 0.970) and IB (R 2 = 0.989), evaluated as individual dyes. This pseudo-second-order model also reproduces the experimental data of the mixture adequately. These findings point out that the adsorption of R40-IB dye mixture takes place through a competitive process, which is more favorable for the anionic dye R40. Furthermore, the achieved removal of 64.1% for this multicomponent system of dyes confirms that RH provides a potential adsorbent capacity and that this methodology is a viable approach for the treatment of colored effluents.
DATA ANALYSIS OF ORGANIC DYE REMOVAL FROM SYNTHETIC WASTE WATER USING LOW-COST ADSORPTION
Wesleyan Journal of Research, 2021
Numerous studies use the adsorption process to remove dyes from organic dye house sewages. Adsorption is commonly used in wastewater treatment systems; activated carbon remains a costly commodity on the market. Safe and economical methods have been required in recent years for handling dye house effluents, forcing researchers to concentrate on producing low-cost adsorbents from the cheapest sources. The quality of our water resources is worsening and the use of colouring produces colour wastewaters that cause environmental concern. Textile wastewater includes a wide variety of dyes and chemical additions that not only as liquid waste but also in its chemical composition pose the environmental challenge for the textile industry. Key contamination of clothing runoff arises from dyeing and finishing operations, these processes involve the input of a wide range of chemicals and dyes, which are usually complex organic compounds. The various input parameters has taken which need to be extracted from clothing wastewater. In this research we propose analysis of dye removal from wastewater with the help of various adsorption, this research also focused on calculate the ph value before and after dye removal from wastewater. For experiment analysis we carried out different kind of dyes which is validated with various configuration of adsorption. The partial implementation and result illustrates when adsorption capacity has increased it will automatically provide maximum dye remove from wastewater.