Textile chemicals such as dyes, printing pigments, additives, oxidising agents and reducing agents can be very injurious to the body and the environment if not properly used. The prime focus of this study is to promot...Textile chemicals such as dyes, printing pigments, additives, oxidising agents and reducing agents can be very injurious to the body and the environment if not properly used. The prime focus of this study is to promote and maintain a safe and healthy environment by ensuring the highest level of environmental health and safety assistance for small scale textile dyers and chemical suppliers within the Sekondi-Takoradi Metropolitan Area of Ghana. Case Study, a descriptive research approach is used because data came mainly from archives, library and by direct observation of textile production practices at the small-scale level. The population for the study involved batik producers, tie-dye producers, screen printers and textile chemical suppliers and dealers. Interviews and observations were used in soliciting relevant data. Data collected was analysed and presented. The study suggests appropriate ways of working with dyes and other chemicals for dyeing. It also simplified information on the available Material Safety Data Sheets (MSDS) for the understanding of the textile producers. This was tailored towards improving communication with the small-scale textile producers who collectively constitute a big percentage of textile producers in Ghana.展开更多
Hazardous waste stream needs to be managed so as not to exceed stock-and rate-limited properties of its recipient ecosystems.The co-pyrolysis of Chinese medicine residue(CMR)and textile dyeing sludge(TDS)and its bio-o...Hazardous waste stream needs to be managed so as not to exceed stock-and rate-limited properties of its recipient ecosystems.The co-pyrolysis of Chinese medicine residue(CMR)and textile dyeing sludge(TDS)and its bio-oil,biochar,and ash quality and quantity were characterized as a function of the immersion of K_(2)CO_(3),atmosphere type,blend ratio,and temperature.Compared to the mono-pyrolysis of TDS,its co-pyrolysis performance with CMR(the comprehensive performance index(CPI))significantly improved by 33.9%in the N_(2)atmosphere and 33.2%in the CO_(2)atmosphere.The impregnation catalyzed the co-pyrolysis at 370℃,reduced its activation energy by 77.3 kJ/mol in the N_(2)atmosphere and 134.6 kJ/mol in the CO_(2)atmosphere,and enriched the degree of coke gasification by 44.25%in the CO_(2)atmosphere.The impregnation increased the decomposition rate of the co-pyrolysis by weakening the bond energy of fatty side chains and bridge bonds,its catalytic and secondary products,and its bio-oil yield by 66.19%.Its bio-oils mainly contained olefins,aromatic structural substances,and alcohols.The immersion of K_(2)CO_(3)improved the aromaticity of the copyrolytic biochars and reduced the contact between K and Si which made it convenient for Mg to react with SiO_(2)to form magnesium-silicate.The co-pyrolytic biochar surfaces mainly included-OH,-CH_(2),C=C,and Si-O-Si.The main phases in the co-pyrolytic ash included Ca_(5)(PO_(4))_(3)(OH),Al_(2)O_(3),and magnesium-silicate.展开更多
文摘Textile chemicals such as dyes, printing pigments, additives, oxidising agents and reducing agents can be very injurious to the body and the environment if not properly used. The prime focus of this study is to promote and maintain a safe and healthy environment by ensuring the highest level of environmental health and safety assistance for small scale textile dyers and chemical suppliers within the Sekondi-Takoradi Metropolitan Area of Ghana. Case Study, a descriptive research approach is used because data came mainly from archives, library and by direct observation of textile production practices at the small-scale level. The population for the study involved batik producers, tie-dye producers, screen printers and textile chemical suppliers and dealers. Interviews and observations were used in soliciting relevant data. Data collected was analysed and presented. The study suggests appropriate ways of working with dyes and other chemicals for dyeing. It also simplified information on the available Material Safety Data Sheets (MSDS) for the understanding of the textile producers. This was tailored towards improving communication with the small-scale textile producers who collectively constitute a big percentage of textile producers in Ghana.
基金National Natural Science Foundation of China (Nos.51978175,42177196,and 22006015)the Scientific and Technological Planning Project of Guangzhou,China (No.202103000004)+2 种基金the Guangdong Province Science and Technology Planning Project,China (No.2022A0505050076)the Dongguan Science and Technology of Social Development Program (No.20211800904662)the Dongguan Sci-tech Commissioner Program (No.20221800500282)。
文摘Hazardous waste stream needs to be managed so as not to exceed stock-and rate-limited properties of its recipient ecosystems.The co-pyrolysis of Chinese medicine residue(CMR)and textile dyeing sludge(TDS)and its bio-oil,biochar,and ash quality and quantity were characterized as a function of the immersion of K_(2)CO_(3),atmosphere type,blend ratio,and temperature.Compared to the mono-pyrolysis of TDS,its co-pyrolysis performance with CMR(the comprehensive performance index(CPI))significantly improved by 33.9%in the N_(2)atmosphere and 33.2%in the CO_(2)atmosphere.The impregnation catalyzed the co-pyrolysis at 370℃,reduced its activation energy by 77.3 kJ/mol in the N_(2)atmosphere and 134.6 kJ/mol in the CO_(2)atmosphere,and enriched the degree of coke gasification by 44.25%in the CO_(2)atmosphere.The impregnation increased the decomposition rate of the co-pyrolysis by weakening the bond energy of fatty side chains and bridge bonds,its catalytic and secondary products,and its bio-oil yield by 66.19%.Its bio-oils mainly contained olefins,aromatic structural substances,and alcohols.The immersion of K_(2)CO_(3)improved the aromaticity of the copyrolytic biochars and reduced the contact between K and Si which made it convenient for Mg to react with SiO_(2)to form magnesium-silicate.The co-pyrolytic biochar surfaces mainly included-OH,-CH_(2),C=C,and Si-O-Si.The main phases in the co-pyrolytic ash included Ca_(5)(PO_(4))_(3)(OH),Al_(2)O_(3),and magnesium-silicate.
