scholarly journals Quantification and evaluation of chemical footprint of woollen textiles

2021 ◽  
Vol 72 (01) ◽  
pp. 68-73
Author(s):  
XIANG JI ◽  
WEIRAN QIAN ◽  
ZEJUN TIAN ◽  
YI LI ◽  
LAILI WANG
Keyword(s):  
Hydrogen Peroxide ◽  
Environmental Load ◽  
High Toxicity ◽  
Toxicity Prediction ◽  
Colour Difference ◽  
Dyeing Process ◽  
Production Processes ◽  
Chemical Pollutants ◽  
Chemicals Management ◽  
Scouring Process

The chemical pollutants discharged in the production processes of textile products cause severe impact on the environment. The chemical footprint (ChF) methodology provides a new way to quantify the toxicity impacts caused by chemical pollutants. ChF does well in identifying priority chemical pollutants and helping enterprises to select greener chemicals to reduce the environment impacts. In this study, the ChF of woollen yarn were assessed with the data that collected from the production processes. The results showed that the ChF of dyeing process (4.10E+06 l) accounted for the largest proportion, because a large number of auxiliaries were used in the dyeing process to prevent uneven dyeing and colour difference, followed by scouring (7.79E+05 l) and finishing (8.11E+03 l). Among all the discharged chemical pollutants, polyoxyethylene nonyl phenyl ether (1.37E+06 l) caused the most ecotoxicity severe impact on the environment due to its high bioaccumulation and high toxicity to ecosystem, followed by sulfuric acid (1.03E+06 l). Sodium chloride and hydrogen peroxide were the two substances that caused the least environmental load. The overall uncertainty caused by toxicity prediction data accounting for 20.2% of the total ChF, and the uncertainty of the scouring process was the most. The results are referable for wool textiles producers to enhance the textile chemicals management.

Research in the cold pad-batch dyeing process for wool pretreated by hydrogen peroxide

2009 ◽  
Vol 125 (3) ◽  
pp. 172-177 ◽  
Author(s):  
Xue Zhao ◽  
Jin-xin He ◽  
Yi-zhen Zhan
Keyword(s):  
Hydrogen Peroxide ◽  
Dyeing Process

scholarly journals Eco-Friendly Cotton/Linen Fabric Treatment Using Aqueous Ozone and Ultraviolet Photolysis

Catalysts ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1265
Author(s):  
Kengo Hamada ◽  
Tsuyoshi Ochiai ◽  
Yasuyuki Tsuchida ◽  
Kyohei Miyano ◽  
Yosuke Ishikawa ◽  
...  
Keyword(s):  
Uv Irradiation ◽  
Advanced Oxidation Processes ◽  
Environmental Load ◽  
Bleaching Effect ◽  
Colour Difference ◽  
Oxidation Processes ◽  
High Consumption ◽  
Ultraviolet Photolysis ◽  
Treatment Changes ◽  
Linen Fabric

Chemicals for the scouring and bleaching of fabrics have a high environmental load. In addition, in recent years, the high consumption of these products has become a problem in the manufacture of natural fabric products. Therefore, environmentally friendly, low-waste processes for fabric treatment are required. In this paper, we discuss the bleaching of fabrics using advanced oxidation processes (AOP). These processes use electrochemically generated aqueous ozone and ultraviolet (UV) irradiation to achieve bleaching. However, colour reversion often occurs. In this study, we suppressed unwanted colour reversion by treatment with rongalite. After treatment, changes in fabric colour were determined by measuring the colour difference and reflectance spectra. The best bleaching effect was obtained when ozone and UV irradiation treatments were combined, achieving results similar to those of a conventional bleaching method after 60 min of UV irradiation. In addition, the AOP treatment resulted in the simultaneous scouring of the fabric, as shown by the increased hydrophilicity of the fabric after AOP treatment. Thus, this AOP process represents a new fabric bleaching process that has an extremely low environmental impact.

Research on microwave pad dyeing process for wool fabric

2017 ◽  
Vol 21 (4) ◽  
pp. 263-275 ◽  
Author(s):  
Xue Zhao
Keyword(s):  
Ph Value ◽  
Wool Fabric ◽  
Process Conditions ◽  
Colour Difference ◽  
Average Deviation ◽  
Sodium Bisulphite ◽  
Content Type ◽  
Dyeing Process ◽  
Wool Fabrics ◽  
Microwave Fixation

Purpose This paper aims to study microwave pad dyeing process for wool fabric. Influences of various dyeing process conditions including galactomannan dosage, urea dosage, sodium bisulphite dosage, pH value, microwave irradiation power, treating time and cold batching time before microwave fixation on K/S values were analysed. The colour yield, fixation and levelness were compared between microwave fixation and cold batching fixation. Design/methodology/approach Colour yield (K/S values) was calculated using a Datacolor SF650 colour measuring and matching instrument (10° standard observer, CIE D65 light source Measuring; Datacolor, USA) and was used to determine the depth of the shade of dyed wool fabrics. Levelness of dyeing was evaluated also using the Datacolor SF650 colour measuring and matching instrument by measuring average deviation (S), range (P) of the maximum and the minimum for lightness (L), chroma (C) and hue (h), and balanced colour difference (ΔE) at 20 specified uniform locations on the wool fabrics. The colour difference was calculated as per the equation ΔE=(ΔL2+Δa2+Δb2)1/2 as appearing in the Experimental section. Fixation was determined using a Datacolor SF650 colour measuring and matching instrument by measuring ratio the of K/S for wool fabrics that were rinsed, washed, neutralised and then dried, and wool fabrics that were dried after fixation without washing. The pH of the padding solution was evaluated using a PHSJ-4A PH meter (Datacolor, USA). SEM analysis was done on JEOL JSM-5600LV machine (JEOL Ltd, Japan). Findings This study is based on application of microwave technology in the processing of silk. Originality/value It was found in laboratory experiments that uniform dyeing and deeper colour can be achieved throughout the microwave pad dyeing process for wool by using galactomannan. The novel process could reduce the dyeing time and the energy consumption of the traditional cold pad-batch dyeing process for wool fabric.

scholarly journals Reguladores de la brotación, alternativos a la cianamida hidrogenada, para suplir la falta de horas de frío en viñedos tropicales del litoral ecuatoriano

2015 ◽  
Vol 3 (1) ◽  
pp. 92-99
Author(s):  
Raquel Herranz
Keyword(s):  
Hydrogen Peroxide ◽  
High Risk ◽  
Culture Conditions ◽  
Direct Application ◽  
Southern Coast ◽  
High Toxicity ◽  
Bud Breaking ◽  
Almost All ◽  
Chilling Hours

La cianamida hidrogenada (CH) es un eficaz estimulante de la brotación de las yemas habitualmente utilizado en viticultura tropical, pero manipular esta materia activa conlleva un alto riesgo por su elevada toxicidad. Según algunos estudios tratamientos alternativos podrían llegar a producir sobre las yemas efectos similar a la CH, compensado la falta de horas de frío en viñedos situados en zonas tropicales, como los ubicados en la costa sur ecuatoriana. De entre todos los tratamientos evaluados destacan los efectos producidos por la aplicación directa sobre las yemas de peróxido de hidrógeno al 5%. Este tratamiento consigue estimular la brotación de la práctica totalidad de las yemas, adelantando e incrementando el desarrollo vegetativo y duplicando el rendimiento de las cepas, sin mermar la calidad de los racimos producidos. Por tanto podemos afirmar que los tratamientos con peróxido de hidrógeno son una alternativa viable, más económica y sostenible, a las aplicaciones de CH en estas condiciones de cultivo AbstractHydrogen cyanamide (CH) is an effective stimulant bud breaking usually used in tropical viticulture, but handling this active substance carries a high risk because of their high toxicity. According to some studies alternative treatments could potentially produce a similar effect on the buds to CH, offset the lack of chilling hours in vineyards located in areas without a sufficient period of chilling hours, such as those located on the southern coast of Ecuador. Among all treatments evaluated the effects include direct application to the buds of hydrogen peroxide 5%. This treatment gets stimulate bud breaking of almost all of the buds, advancing and increasing vegetative growth and doubling the performance of the strains, without compromising the quality of the grapes produced. Therefore we can say that the hydrogen peroxide treatments are a viable, economical and sustainable, alternative to CH applications in these culture conditions.

scholarly journals PEWARNAAN BATIK TULIS MENGGUNAKAN PEWARNA ALAMI DAN BAHAN FIKSASI KITOSAN PADA KELOMPOK BATIK TULIS ASIH MATAHARI KOTA BLITAR

Jurnal ABDI ◽  
2019 ◽  
Vol 4 (2) ◽  
pp. 55
Author(s):  
Dina Kartika ◽  
Siti Tjahjani ◽  
Nita Kusumawati
Keyword(s):  
Natural Dye ◽  
Coating Process ◽  
Pattern Design ◽  
Improve Efficiency ◽  
Dyeing Process ◽  
Production Processes

Development on batik production processes inovation including dyeing process and pattern design become one of important factors that increase selling and production. Blitar city has unique batik product namely koi fish batik. The product is less popular among others batik from different city, so training on dyeing process with natural dye are essential to do. The objective of the training were to improve skill of dyeing process. The training for batik tulis group partner which Asih Matahari group included introduction of natural dye for batik dyeing and introduction of eco friendly fixation agent for dyeing process and use of padder tools to improve efficiency of dye coating process. The result of the training showed that batik group can use natural dye and do the dyeing with fixation agent Chitosan . Response of the training member showed high enthusiasm and interested toward training..

Oxidative treatment characteristics of biotreated textile-dyeing wastewater and chemical agents used in a textile-dyeing process by advanced oxidation process

2004 ◽  
Vol 49 (5-6) ◽  
pp. 137-143 ◽  
Author(s):  
B.-R. Lim ◽  
H.-Y. Hu ◽  
K.-H. Ahn ◽  
K. Fujie
Keyword(s):  
Hydrogen Peroxide ◽  
Biological Treatment ◽  
Treatment Process ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Dyeing Wastewater ◽  
Dyeing Process ◽  
Textile Dyeing ◽  
Textile Dyeing Wastewater

The oxidative treatment characteristics of biotreated textile-dyeing wastewater and typical chemicals such as desizing, scouring, dispersing and swelling agents used in the textile-dyeing process by advanced oxidation process were experimentally studied. The refractory organic matters remained in the effluent of biological treatment process without degradation may be suitable for the improvement of biodegradability and mineralized to CO2 by combined ozonation with and without hydrogen peroxide. On the other hand, the refractory chemicals contained in the scouring agent A and swelling agent may not be mineralized and their biodegradability may not be improved by ozonation. However, the BOD/DOC ratio of scouring agent B increased from 0.3 to 0.45 after ozonation. Based on the results described above, advanced treatment process involving the ozonation without and with the addition of hydrogen peroxide, followed by biological treatment was proposed for the treatment of refractory wastewater discharged from the textile-dyeing process.

Sequential Oxidative/Reductive Bleaching and Dyeing of Wool in a Single Bath at Low Temperatures

1992 ◽  
Vol 62 (3) ◽  
pp. 123-130 ◽  
Author(s):  
Mustafa Arifoglu ◽  
William N. Marmer
Keyword(s):  
Hydrogen Peroxide ◽  
Bleaching Agent ◽  
Sulfate Anion ◽  
Peroxide Bleaching ◽  
Dyeing Process ◽  
Thiourea Dioxide ◽  
Residual Hydrogen ◽  
Single Bath ◽  
Almost All ◽  
Sulfonate Anion

A new bleaching and dyeing process applicable to wool involves a sequential oxidative/reductive bleaching combined with a subsequent dyeing in a single bath. Apart from dyebath bleaching processes in which the bleaching agent is added towards the end of the dyeing process when almost all the dye is exhausted, bleaching and subsequent dyeing are normally done in separate baths due to the sensitivity of the dyes to bleaching agents. In the latter process, it is important that all bleaching agents be thoroughly washed off before dyeing, because any residual bleaching agent (hydrogen peroxide, reductive bleach) may adversely affect the results. The newly developed single-bath process begins with an oxidative hydrogen peroxide bleaching followed by addition of thiourea to the residual hydrogen peroxide in the same bath. Thiourea dioxide formed by the resulting chemical reaction hydrolyzes in solution to sulfonate anion and urea. Sulfinate anion is a strong reducing agent and effects reductive bleaching. At the end of the reductive bleaching stage, a small amount of hydrogen peroxide is added to oxidize all the reductive sulfur species in solution to the sulfate anion, which together with the urea serves subsequently as a dye assist. Once the temperature of the bath is lowered, dyes may be added to the same bath. The new sequential single-bath bleaching/dyeing process results in much brighter pastel shades upon dyeing, due to better whiteness obtained initially with sequential oxidative/reductive bleaching. Furthermore, there is a reduction in processing time, temperature, and effluent compared with conventional procedures and the utilization of byproducts from the initial bleaching assists during the subsequent dyeing step.

Comparison of Life Cycle Environmental Impacts between Natural Gypsum Board and FGD Gypsum Board

2014 ◽  
Vol 599 ◽  
pp. 15-18 ◽  
Author(s):  
Zhen Guo Peng ◽  
Li Li Ma ◽  
Xian Zheng Gong
Keyword(s):  
Life Cycle ◽  
Flue Gas ◽  
Renewable Resources ◽  
Flue Gas Desulfurization ◽  
Environmental Load ◽  
Gypsum Board ◽  
Fgd Gypsum ◽  
Toxicity Effect ◽  
Production Processes ◽  
Total Life

This paper gets two inventories of environmental load of two kinds of gypsum plasterboards by studying the production processes of the natural gypsum board and flue gas desulfurization (FGD) gypsum through life cycle assessment. The results show that the total life cycle environment load of the natural gypsum board is 6% higher than the FGD gypsum board. Human toxicity effect increases by 72% and the consumption of non-renewable resources is 76% higher than the total life cycle environment load of natural gypsum board.

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