Adsorption is an important process in wastewater treatment,and conversion of waste materials to adsorbent offers a solution to high material cost related to the use of commercial activated carbon.This study investigat...Adsorption is an important process in wastewater treatment,and conversion of waste materials to adsorbent offers a solution to high material cost related to the use of commercial activated carbon.This study investigated the adsorption behaviour of Reactive Black 5（RB5）and methylene blue（MB）onto activated carbon produced from textile sludge（TSAC）.The activated carbon was synthesized through chemical activation of precursor followed with carbonization at 650℃ under nitrogen flow.Effects of time（0–200 min）,pH（2–10）,temperature（25–60℃）,initial dye concentration（0–200 mg·L^-1）,and adsorbent dosage（0.01–0.15 g）on dye removal efficiency were investigated.Preliminary screening revealed that TSAC synthesized via H2SO4activation showed higher adsorption behaviour than TSAC activated by KCl and ZnCl2.The adsorption capacity of TSAC was found to be 11.98 mg·g^-1（RB5）and 13.27 mg·g^-1（MB）,and is dependent on adsorption time and initial dye concentration.The adsorption data for both dyes were well fitted to Freundlich isotherm model which explains the heterogeneous nature of TSAC surface.The dye adsorption obeyed pseudo-second order kinetic model,thus chemisorption was the controlling step.This study reveals potential of textile sludge in removal of dyes from aqueous solution,and further studies are required to establish the applicability of the synthesized adsorbent for the treatment of waste water containing toxic dyes from textile industry.展开更多
The soccer teams of the World Cup wear the jerseys manufactured by Taiwan Residents textile companies which are the contractors of such brand corporations as Nike and Adidas. Because Taiwan Residents textile companies...The soccer teams of the World Cup wear the jerseys manufactured by Taiwan Residents textile companies which are the contractors of such brand corporations as Nike and Adidas. Because Taiwan Residents textile companies suffer water pollution events, this study verifies the market reactions to the two announcements of water pollution events from 2014 to 2015. The two events are as follows： first, Greenpeace International enabled 38 scientists to announce the ban on fluoride in Madrid; second, Greenpeace International has detected fluoride residues from the water in remote mountainous areas of Europe and concluded that Taiwan Residents jerseys composed of fluoride pollute the rivers or snows. The findings of the research indicate that the announcement of the ban on fluoride induces negative abnormal returns because fluoride is the main materials for Taiwan Residents jerseys. Most importantly, the announcement of the water pollution in Europe from Taiwan Residents manufactured jerseys induces negative abnormal returns. Both of the two events enable the stock investors scared about the decrease of future profit and market share for Taiwan Residents textile corporations. Consequently, investors sell the stocks of these corporations, inducing the negative abnormal returns during the announcement of water pollution of Taiwan Residents jerseys. Water polluted issues are critical of firm values.展开更多
The textile processing plants utilize a wide variety of dyes and other chemicals such as acids, bases, salts, detergents, sizes, oxidants, mercerizing and finishing chemicals. Many of these are not retained in the fin...The textile processing plants utilize a wide variety of dyes and other chemicals such as acids, bases, salts, detergents, sizes, oxidants, mercerizing and finishing chemicals. Many of these are not retained in the final product and are discharged in the effluent. Therefore, the objective of this study was to assess the performance of Expanded Granular Sludge Bed （EGSB） reactor to treat synthetic textile wastewater. Several experiments using Direct Red 81 and volatile fatty acids as model substrates were conducted. The problems of decolorization was evaluated at a variety of relevant operational conditions, such as substrate concentration, organic and hydraulic loading rates. The results showed that retention time of EGSB equals 1.6 h and 80 mg/L at the hydraulic and dye concentration respectively, and that the color removal efficiency can reach 90%. Additionally, some chemical additions were proposed to improve the decolorization rate and increase the treatment efficiency of the system. For instance, sulfide was added at 200 mg/L in the influent, which can increase the dye removal efficiency to 95%.展开更多
基金the Ministry of Higher Education,Malaysia(MOHE)for the financial supports received under University Grant(08H05)and Fundamental Research Grant Scheme(4F872)Universiti Teknologi Malaysia for the GUP grant No.17H65the support to the main author,Wong Syie Luing,in the form of Post-Doctoral Fellowship Scheme for the project"Catalytic Cracking of Low Density Polyethylene Waste to Liquid Fuels in Fixed Bed Reactor"
文摘Adsorption is an important process in wastewater treatment,and conversion of waste materials to adsorbent offers a solution to high material cost related to the use of commercial activated carbon.This study investigated the adsorption behaviour of Reactive Black 5（RB5）and methylene blue（MB）onto activated carbon produced from textile sludge（TSAC）.The activated carbon was synthesized through chemical activation of precursor followed with carbonization at 650℃ under nitrogen flow.Effects of time（0–200 min）,pH（2–10）,temperature（25–60℃）,initial dye concentration（0–200 mg·L^-1）,and adsorbent dosage（0.01–0.15 g）on dye removal efficiency were investigated.Preliminary screening revealed that TSAC synthesized via H2SO4activation showed higher adsorption behaviour than TSAC activated by KCl and ZnCl2.The adsorption capacity of TSAC was found to be 11.98 mg·g^-1（RB5）and 13.27 mg·g^-1（MB）,and is dependent on adsorption time and initial dye concentration.The adsorption data for both dyes were well fitted to Freundlich isotherm model which explains the heterogeneous nature of TSAC surface.The dye adsorption obeyed pseudo-second order kinetic model,thus chemisorption was the controlling step.This study reveals potential of textile sludge in removal of dyes from aqueous solution,and further studies are required to establish the applicability of the synthesized adsorbent for the treatment of waste water containing toxic dyes from textile industry.
文摘The soccer teams of the World Cup wear the jerseys manufactured by Taiwan Residents textile companies which are the contractors of such brand corporations as Nike and Adidas. Because Taiwan Residents textile companies suffer water pollution events, this study verifies the market reactions to the two announcements of water pollution events from 2014 to 2015. The two events are as follows： first, Greenpeace International enabled 38 scientists to announce the ban on fluoride in Madrid; second, Greenpeace International has detected fluoride residues from the water in remote mountainous areas of Europe and concluded that Taiwan Residents jerseys composed of fluoride pollute the rivers or snows. The findings of the research indicate that the announcement of the ban on fluoride induces negative abnormal returns because fluoride is the main materials for Taiwan Residents jerseys. Most importantly, the announcement of the water pollution in Europe from Taiwan Residents manufactured jerseys induces negative abnormal returns. Both of the two events enable the stock investors scared about the decrease of future profit and market share for Taiwan Residents textile corporations. Consequently, investors sell the stocks of these corporations, inducing the negative abnormal returns during the announcement of water pollution of Taiwan Residents jerseys. Water polluted issues are critical of firm values.
文摘The textile processing plants utilize a wide variety of dyes and other chemicals such as acids, bases, salts, detergents, sizes, oxidants, mercerizing and finishing chemicals. Many of these are not retained in the final product and are discharged in the effluent. Therefore, the objective of this study was to assess the performance of Expanded Granular Sludge Bed （EGSB） reactor to treat synthetic textile wastewater. Several experiments using Direct Red 81 and volatile fatty acids as model substrates were conducted. The problems of decolorization was evaluated at a variety of relevant operational conditions, such as substrate concentration, organic and hydraulic loading rates. The results showed that retention time of EGSB equals 1.6 h and 80 mg/L at the hydraulic and dye concentration respectively, and that the color removal efficiency can reach 90%. Additionally, some chemical additions were proposed to improve the decolorization rate and increase the treatment efficiency of the system. For instance, sulfide was added at 200 mg/L in the influent, which can increase the dye removal efficiency to 95%.
