HOGLA LEAF AS A POTENTIAL BIO-ADSORBENT FOR THE TREATMENT OF REACTIVE DYES IN TEXTILE EFFLUENTS (original) (raw)
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IJCRT, 2024
When compared to natural colorants, synthetic dyes are more common in the industries due to their lower cost, stability, ease of production, and availability of a wider variety of colors. However, dyes reduce the mobility of oxygen, decrease photosynthesis, and restrict sunlight and affects ecosystem of the biosphere adversely. Therefore, the environment will continue to be concerned about waters that contain dyes. Dyes also have a substantial impact on water quality. In addition, worldwide freshwater shortages are becoming more acute as a result of the fast growing global population, changing climate, and industrial expansion. Hence, water treatment (WT) is currently one of the key study fields due to the depletion of water supplies and excessive environmental pollution. This has made it necessary to upgrade traditional technologies to ones that are safer, more affordable, recyclable, and reusable. Enhancing the effectiveness of its removal from wastewater has been the focus of numerous research projects. The review will discuss the types of textile dyes, their toxicity, and treatment strategies including physical, chemical, and biological remediations.
2013
The pH of Textile effluent is generally high because of use of many alkaline substances in Textile processing. The total dissolved solids (TDS) are those solids remain as soluble form in Textile effluent. There are several methods available for removal of TDS and color from Textile effluent such as, ion exchange, coagulation and flocculation, biological decolorization, adsorption etc. Among all these methods adsorption is still a procedure of choice for TDS and color removal. Several naturally occurring aquatic/non aquatic plants have been used in this work as adsorbents. These were water hyacinth, water lily and bark of plantain plant (banana). All of three plants could be useful for adsorption of pollutants but considering all experimental results the remarkable result was achieved in case of adsorption of pollutants on plantain plant (banana) bark from inlet effluent of Echotex Ltd; Chandra, Gazipur, Bangladesh. Both the pH and TDS removal obtained in this case, pH values were 7.3 (before treatment) and 6.5 (after treatment) and TDS values were 2700 mg/L (before treatment) and 2600 mg/L (after treatment). Different combinations of coagulants were also used for color removal and sludge separation. The best color removal and sludge separation were obtained in case of FeSO4 + CaO.
Removal of Dyes from Textile Industry Effluent: A Review
— Effluent from the textile industry contains toxic compounds. These compounds contaminate the surface water, thereby making it unfit for irrigation and drinking. Since farmers use water from the rivers for agricultural purposes and the residents of the town, use both the surface and underground water from the same area as potable water, it is quite unsafe to discharge this effluent into water body. Suspended solids can clog fish gills, either kill them or reduce their growth rate. They also reduce the ability of algae to produce food and oxygen. Therefore, proper treatment of effluent water and enforcement of pollution control by the regulatory authority on the indiscriminate discharge of textile wastewater into water bodies should be done. Batch adsorption experiments using Ashoka leaf powder, a low cost, locally available biomaterial as an adsorbent has been used for removal of cationic dyes such as Methylene blue, Malachite Green, Rhodamine B and Brilliant Green from effluent of textile industry.
Cationic dyes removal from textile wastewaters by using ecofriendly adsorbents
Revista de Chimie -Bucharest- Original Edition-
The use of cheap and ecofriendly adsorbents, as: hemp fibres, cellolignine, peat and cotton, have been studied as an alternative substitution of AOPs for the removal of some cationic dyes with compact condensed structures from textile wastewater. The sorption capacity of adsorbents was evaluated spectrometricaly and removal degree for cationic dyes was calculated, as well as Langmuir and Freundlich models were applied to describe the sorption isotherm and the characteristic parameters are calculated. A kinetic study concerning sorption/desorption process was elaborated.
Dye Removal from Textile Wastewater using Bioadsorbent
Textile industries throughout the world produce huge quantities of dyes and pigments are produced annually throughout the world, especially by textile industries. Effluents from textile industries are dye wastewater and the disposal of these wastes to receiving freshwater bodies causes damage to the environment. Among the treatment technologies, adsorption is an attractive and viable option, provided that the sorbent is inexpensive and readily available for use. In this study, a typical basic dye, methylene blue, in wastewater was treated using Melia azedarach sawdust. The effects of contact time, adsorbent amount and particle size were investigated on the removal efficiency of adsorbent for methylene blue. Complete removal of the dye were attained at higher adsorbent dose of 3 g/L with 50 mg/L initial dye concentration. The maximum adsorption was at 240 minutes, whereas more than 90% removal with 105 µm particle size of 1g/L adsorbent for same initial dye concentration. The experim...
Effective Removal of Textile Dyes Using Pre-Treated Natural Adsorbents
ENVIRONMENTAL CONTAMINANTS REVIEWS, 2020
Water contamination due to textile industrial discharge is one of major problems of modern world. Azo dyes are major culprits of water pollution due to presence of complicated azo bond. Synthetic wastewater with high concentration of azo dyes has been treated using different adsorbents in this study. This exploration technique is proved to be conservative, appealing and compelling for the removal of dyes from wastewater. In this investigation, pre-treated sugarcane bagasse and chicken eggshell were utilized as an adsorbent for adsorption of azo dyes from wastewater. All the experiments were allowed to run for 160 minutes. These adsorbents satisfactorily served the purpose of application. Eggshells and sugarcane bagasse and presented 79% and 73% removal of reactive red-1 respectively. Removal of direct blue-1 was observed as 96% and 95% using eggshells and sugarcane bagasse respectively.
A Review of Various Treatment Methods for the Removal of Dyes from Textile Effluent
Recent Progress in Materials
Wastewater generated by the textile industry has been a major environmental concern for a long. Production of fiber involves various steps and uses a lot of chemicals, dyes, and water. Therefore, the effluent produced from the textile industry needs proper purification before discharging into the water body. The current review summarizes various physical and chemical methods like ion exchange, coagulation-flocculation, membrane separation, membrane distillation, oxidation, ozonation, etc., for wastewater treatment. Along with this, adsorption methods, the various adsorbents used to purify wastewater, and the mechanism involved in adsorption have also been discussed. The biological method utilizes various microbes (bacteria, fungi, algae, and yeast) as a whole and the enzymes (laccase and azoreductase) secreted by them for wastewater treatment, which have been considered more feasible than physical and chemical methods. The adsorption and biological methods are better than other tech...
Use of water treatment residuals for colour removal from real textile dye wastewater
Applied Water Science
The use of readily available water treatment residuals (WTR) as a low-cost material for removal of colour from real textile wastewater was investigated. WTR was used in three forms, namely in raw wet form as a coagulant, in the dried form as an adsorbent and as a filtration media in column tests. The results showed a maximum colour removal of 55 and 36% by coagulation and adsorption, respectively, and the corresponding COD removals were 35 and 37%. Coagulation and batch sorption tests showed the effect of initial pH on the colour removal, and maximum colour removal was obtained at an initial pH of 3.0. Long-duration continuous-flow column test using WTR as a filtration/sorption media showed that a maximum colour removal of 60% can be achieved. In column studies, complete exhaustion of the media occurred at 180 and 120 bed volumes, respectively, for initial pHs of 3.0 and 6.2. The study thus shows the potential of WTR for primary treatment of real textile dye wastewater.
Removal of Various Textile Dyes from Aqueous Solution Using Low Cost Biodegradable Adsorbent
ESJ, 2018
In textile industry, dyes remove from solution using synthetic materials which is harmful for environment and expensive. In this research work acid treated saw dust(ATSD) used to remove of dyes from aqueous solution. It is environment friendly & cheap. This research work has been carried out using Acid dye,1:2 metal complex dye, Acid-reactive dye, Reactive dye. The objective of work was how many dye separately removes from solution. Acid & 1:2 metal complex dye removed from auxiliary free aqueous solution. In similar dye concentration(gm/l) less ATSD removes acid dye than 1:2 metal complex dye. By Beers-lambert law we explained the deviation of ATSD solution from standard solution of T% & Wavelength curve.
REVIEW PAPER ON REMOVAL OF A DYE FROM AQUEOUS SOLUTION BY ADSORPTION
To investigate the adsorption capacities of locally available low cost bio-adsorbents like neem leaves, orange peels, peanut hulls and coconut coir pith powders to remove colour in a textile industry wastewater, experiments were performed. The experiments were conducted at pH of 7 with different process parameters like adsorbent dosage, temperature, contact time and agitator speed using batch adsorption method. From the experimental results, the maximum colour from the textile industry wastewater was obtained at an optimum adsorbent dosage of 350 mg, an optimum contact time of 73 min., an optimum temperature of 330 K and an optimum agitator speed of 650 rpm. Further, from the validation experiments, it was found that the maximum colour removal percentage in textile industry wastewater is about 75.2%, 78.3%, 86.6% and 81.7 % respectively for neem leaves, orange peels, peanut hulls and coconut coir pith powders. This result was higher than the results obtained by different process parameters for various bio-adsorbents. Finally, from the results of adsorption study, it was concluded that bio-adsorbents used as a coagulant for removing the colour from textile industry wastewater especially peanut hulls powder because of its higher adsorptive capacity than other bio-adsorbents used in this study.