The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
K. M. Mohiuddin - One of the best experts on this subject based on the ideXlab platform.
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Public perception and health implication of loom-dye effluent irrigation on growth of rice (Oryza sativa L.) and red amaranth (Amaranthus tricolor L.) seedlings
Environmental Science and Pollution Research, 2020Co-Authors: Md. Arifur Rahman, Md. Abul Khair Chowdhury, Biplob Kumar Saha, Md. Akhter Hossain Chowdhury, K. M. MohiuddinAbstract:Loom-dye effluent discharge has constituted a major environmental threat to the people of Belkuchi Upazila of Sirajganj District. The present study was conducted to characterize loom-dye Effluents and investigate their health implications by the growth analysis of rice and red amaranth seedlings along with a survey study among the individuals associated with loom-dyeing, weaving, and crop farming activities. A total of twenty-eight loom-dye effluent samples were collected for physicochemical characterization; among them, only three loom-dye Effluents, i.e. pink, violet, and black dyes, at concentrations of 0, 10, 25, 50, 75, and 100% were applied as irrigation water to rice and red amaranth. The plant growth experiment was laid out following a completely randomized design with three replicas. Chemical analyses of loom-dye Effluents showed the presence of a significant amount of plant nutrients and heavy metals. The mean concentrations of Pb, Cd, Cr, Fe, Mn, Zn, and Cu were 0.938, 0.046, 0.212, 7.109, 0.609, 0.351, and 0.191 mg L^−1, respectively. Among the metals, the concentrations of Pb, Cr, Fe, and Mn were above the recommended limit proposed by the irrigation water guideline value. Application of ≤ 25% pink and violet dye effluent and ≤ 10% black dye effluent had significant ( p
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Heavy metals in handloom-dyeing Effluents and their biosorption by agricultural byproducts
Environmental Science and Pollution Research, 2018Co-Authors: Kamrun Nahar, Md. Abul Khair Chowdhury, Afzal Rahman, K. M. MohiuddinAbstract:The Madhabdi municipality in the Narsingdi district of Bangladesh is a well-known area for textile, handloom weaving, and dyeing industries. These textile industries produce a considerable amount of Effluents, sewage sludge, and solid waste materials every day that they directly discharge into surrounding water bodies and agricultural fields. This disposal poses a serious threat to the overall epidemic and socio-economic pattern of the locality. This research entailed the collection of 34 handloom-dyeing effluent samples from different handloom-dyeing industries of Madhabdi, which were then analyzed to determine the contents of the heavy metals iron (Fe), zinc (Zn), copper (Cu), chromium (Cr), manganese (Mn), lead (Pb), and cadmium (Cd). Average concentrations of Fe, Cr, Cu, Pb, Mn, and Zn were 3.81, 1.35, 1.70, 0.17, 0.75, and 0.73 mg L−1, respectively, whereas Cd content was below the detectable limit of the atomic adsorption spectrophotometer. The concentrations of Fe, Cr, Cu, Pb, and Mn exceed the industrial effluent discharge standards (IEDS) for inland surface water and irrigation water guideline values. A biosorption experiment of the heavy metals (Fe, Cr, Cu, Mn, and Zn) was conducted without controlling for any experimental parameters (e.g., pH, temperature, or other compounds present in the effluent samples) by using four agricultural wastes or byproducts, namely rice husk, sawdust, lemon peel, and eggshell. Twenty grams of each biosorbent was added to 1 L of effluent samples and stored for 7 days. The biosorption capacity of each biosorbent is ranked as follows: eggshell, sawdust, rice husk, and lemon peel. Furthermore, the biosorption affinity of each metal ion was found in the following order: Cu and Cr (both had similar biosorption affinity), Zn, Fe, Mn. The Effluents should not be discharged before treatment, and efficient treatment of Effluents is possible with eggshell powder or sawdust at a rate of 20 g of biosorbent per liter of Effluents.
Nelson Durán - One of the best experts on this subject based on the ideXlab platform.
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Novas tendências no tratamento de efluentes têxteis
Quimica Nova, 2002Co-Authors: Airton Kunz, Sandra Gomes De Moraes, Patricio Peralta-zamora, Nelson DuránAbstract:Textile Effluents, when not correctly treated, cause a high impact to the environment. The main recalcitrant compounds present in textile effluent are represented by the synthetic dyes, used during the fibber dying process. Among others, the azo dyes are considered the most harmful due to its mutagenic and carcinogenic character. In the present work we reported a revision study on the new tendencies for remediation of textile Effluents, mainly to degrade the recalcitrant compounds. For this purpose, chemical, physical, photochemical, biological and combined processes were investigated.
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evaluation of zno tio2 and supported zno on the photoassisted remediation of black liquor cellulose and textile mill Effluents
Chemosphere, 1998Co-Authors: Patricio Peraltazamora, Sandra Gomes De Moraes, Ronaldo Pelegrini, Mariwalde Freire, Juan Reyes, Hector D Mansilla, Nelson DuránAbstract:Treatment of effluent from the cellulose and textile industries by applying a heterogeneous photocatalytic procedure using UV-light and free and supported catalysts is reported. When Krafi and textile Effluents are submitted to UV-irradiation in the presence of free Ti02 and ZnO or silica gel supported ZnO, the colour fades progressively to reach substantial decolorization ratios. This decolorization process is accompanied by a considerable reduction of total phenol concentrations in the black liquor and final effluent. For bleaching mixture, the reduction of phenol concentration is not significant, and on the contrary, for textile Effluents an increase of phenolic compound concentrations is observed during the initial phase of the photocatalytic process The progressive degradation of the different chemical species contained in the Effluents was demonstrated by HPLC analysis and total organic carbon contents determination. This degradation permitted an important reduction of the acute toxicity of the Effluents. 019% Elsevier Science Ltd
Wouter Delée - One of the best experts on this subject based on the ideXlab platform.
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Colour in textile Effluents - Sources, measurement, discharge consents and simulation: A review
Journal of Chemical Technology and Biotechnology, 1999Co-Authors: Cliona O'neill, Nidia D. Lourenço, D. L. Hawkes, Helena M. Pinheiro, Freda R. Hawkes, Wouter DeléeAbstract:This paper aims to review the problem of colour in textile Effluents, the different classes of dyes available and their contribution to the problem. Through new regulations, pressure is being placed on water companies all over the world to reduce the amount of colour in sewage effluent. Dyes exhibit low toxicity to mammals and aquatic organisms and therefore colour consents are normally applied for aesthetic and industrial reasons rather than for prevention of toxicity. The absorbance, ADMI values and concentrations of dyes in effluent are examined here with particular reference to reactive azo dyes used in cotton processing. Colour consents, the problem of colour in textile wastewaters and the importance for research in this area are also discussed. Dye concentrations of 0.01 g dm(-3) up to 0.25 g dm(-3) have been cited as being present in dyehouse effluent, depending on the dyes and processes used. ADMI values ranged from 50 to 3890 units for the dyeing of cotton. It was concluded that 1500 ADMI units was a reasonable value to aim for when simulating coloured Effluents. Simulated textile Effluents may be used for research purposes. These should resemble real wastes as closely as possible, but it is often difficult to replicate the ADMI values, absorbance and spectra of real Effluents. The concentrations of dye used in simulated Effluents examined in literature varied from 0.01 g dm(-3) to 7 g dm(-3). As absorbance and ADMI values change with the types of dye used, it is difficult to relate these values to dye concentrations. A concentration of 0.18 g dm(-3) of a Red or Yellow dye or 0.43 g dm(-3) of a blue dye would provide an ADMI of approximately 1500 units and fits within the range of dye concentrations presented in literature. A dye mixture simulating colour in a real textile effluent is suggested and some limitations of simulating actual wastewaters discussed. (C) 1999 Society of Chemical Industry.
Ka Lok Chiu - One of the best experts on this subject based on the ideXlab platform.
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Regeneration and reuse of highly polluting textile dyeing Effluents through catalytic ozonation with carbon aerogel catalysts
Journal of Cleaner Production, 2016Co-Authors: Enling Hu, Songmin Shang, Xiao Ming Tao, Shouxiang Jiang, Ka Lok ChiuAbstract:Reactive dyeing of cotton generates a great deal of coloring wastewater containing residual dyes, electrolyte, alkali, and other auxiliaries. Especially for the effluent from the first/initial spent dyeing bath, it may be comprised of as high as 60% of the initial dye dosed, 30–90 g/L of sodium chloride or sodium sulfate, and plenty of sodium carbonate, making it to be the most contaminative effluent among the entire reactive dyeing process. This paper presents a new alternative to regenerate the waste effluent from the first spent dyeing bath through catalytic ozonation with novel catalysts for reuse of the effluent in successive dyeing. Two novel ozonation catalysts, mesoporous carbon aerogel and its supported cobalt oxide nanoparticles, were successfully prepared and used in catalytic degradation of residual dyes in waste Effluents with ozone. Degradation efficiency was determined by both decolorization and chemical oxygen demand removal. The result showed novel catalysts could improve both of these two targets. For chemical oxygen demand removal, carbon aerogel supported cobalt oxide strikingly enhanced the efficiency by 30% on the whole comparing to ozonation alone (approximately 50%) without the catalyst. Waste Effluents after catalytic ozonation were thereafter reused in successive dyeing in the same process. It has been validated that the waste effluent was successfully regenerated and can be additionally reused twice without sacrificing fabric quality, which cannot be realized in ozonation alone. Color difference of the fabric dyed with the regenerated effluent was within the acceptable tolerance, and excellent levelness and equal colorfastness had also been achieved. This is probably the first study to investigate the feasibility of regenerating highly polluting dyeing Effluents for reuse by catalytic ozonation with carbon aerogel materials. With novel catalysts, it could be speculated that catalytic ozonation is a promising technology for in-situ regeneration of waste Effluents in textile dyeing plant for reuse.
Russell R. Chianelli - One of the best experts on this subject based on the ideXlab platform.
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Indigo dye waste recovery from blue denim textile effluent: a by-product synergy approach
New Journal of Chemistry, 2008Co-Authors: Dennis Wambuguh, Russell R. ChianelliAbstract:Textile dyeing Effluents present a substantial environmental problem, primarily because such Effluents contain high concentrations of waste dyes, dye-products, and variable salts. The stonewashing process for the degradation of blue indigo to create a 'faded' look in blue denim results in high concentrations of indigo dye waste in the resulting effluent and because indigo is very difficult to decompose biologically, the effluent ends up in the environment, raising aesthetic concerns and damaging the integrity of the receiving streams. Wastewater containing indigo is characterized by a moderate amount of chemical oxygen demand ( COD), pH, suspended solids, dissolved solids and a dark blue color. Although color and COD are some of the important parameters monitored to meet effluent discharge standards, companies are discouraged from treating or recovering the waste dye by cost implications. We report on a simple and potentially cost-effective method of recovering indigo dye waste from the effluent through adsorption with palygorskite clay and subsequent conversion of recovery by-products into Maya blue, an organic-inorganic hybrid pigment with applications in the paint and coating industry. The production of a secondary commercial product from waste stream through a by-product synergy process offers an attractive alternative to discharging the untreated effluent into municipal treatment plants or the environment.
