The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Ho Kyong Shon - One of the best experts on this subject based on the ideXlab platform.
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coagulation performance and floc characteristics of polytitanium tetrachloride ptc compared with titanium tetrachloride ticl4 and ferric chloride fecl3 in algal turbid water
Separation and Purification Technology, 2017Co-Authors: Laura Chekli, C Eripret, S H Park, S A A Tabatabai, O Vronska, Bojan Tamburic, Jongoh Kim, Ho Kyong ShonAbstract:Abstract Seasonal green algae blooms in freshwaters have raised attention on the need to develop novel effective treatment processes for the removal of algae in water. In the present study, the performance of newly developed polytitanium tetrachloride (PTC) Coagulant for the removal of freshwater microalga Chlorella vulgaris has been investigated and compared with titanium tetrachloride (TiCl 4 ) Coagulant and the conventional ferric chloride (FeCl 3 ) Coagulant. The main benefit of using titanium-based Coagulants is that the sludge produced after flocculation may be recycled into a valuable product: titanium dioxide photocatalyst. Both titanium-based Coagulants achieved good flocculation over a broader pH range and Coagulant dose compared to conventional FeCl 3 Coagulant. All three Coagulants achieved comparable performance in terms of turbidity removal (i.e. turbidity removal efficiency >97%); although TiCl 4 performed slightly better at the lower tested dose (i.e. 3 and also grew at a faster rate. This study indicates that Ti-based Coagulants are effective and promising Coagulants for algae removal in water.
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coagulation performance and floc characteristics of polytitanium tetrachloride and titanium tetrachloride compared with ferric chloride for coal mining wastewater treatment
Separation and Purification Technology, 2015Co-Authors: Yanxia Zhao, Laura Chekli, S H Park, J Galloux, Baoyu Gao, Sherub Phuntsho, Leonard D Tijing, Sanghyun Jeong, Ho Kyong ShonAbstract:Abstract The production and discharge of large volumes of wastewater during coal mining activities are one of the major environmental issues in Australia. Therefore, it is crucial to develop and optimise effective treatment processes for the safe disposal of coal mining wastewater (CMWW). In this study, we investigated the performance of a recently developed polytitanium tetrachloride (PTC) Coagulant and compared with the performance of titanium tetrachloride (TiCl 4 ) and the commonly used ferric chloride (FeCl 3 ) Coagulant for the treatment of CMWW from one of the coal mining sites in Australia. The use of Ti-based Coagulants is particularly attractive for the CMWW treatment due to the advantage of being able to recycle the sludge to produce functional titanium dioxide (TiO 2 ) photocatalyst; unlike the flocs formed using conventional Coagulants, which need to be disposed in landfill sites. The results showed that both PTC and TiCl 4 performed better than FeCl 3 in terms of turbidity, UV 254 and inorganic compounds (e.g. aluminium, copper or zinc) removal, however, PTC performed poorly in terms of dissolved organic carbon removal (i.e. less than 10%). While charge neutralisation and bridging adsorption were the main coagulation mechanisms identified for TiCl 4 treatment ; sweep coagulation and bridging adsorption seemed to play a more important role for both PTC and FeCl 3 treatments. The flocs formed by PTC coagulation achieved the largest floc size of around 900 μm with the highest floc growth rate. Both Ti-based Coagulants (i.e., PTC and TiCl 4 ) showed higher strength factor than FeCl 3 , while TiCl 4 Coagulant yielded the flocs with the highest recovery factor. This study indicates that Ti-based Coagulants are effective and promising Coagulants for the treatment of CMWW.
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coagulation performance and floc characteristics of polytitanium tetrachloride ptc compared with titanium tetrachloride ticl4 and iron salts in humic acid kaolin synthetic water treatment
Separation and Purification Technology, 2015Co-Authors: Laura Chekli, J Galloux, Yi Zhao, Baoyu Gao, Ho Kyong ShonAbstract:Abstract Polymeric metal Coagulants are increasingly used to improve the coagulation/flocculation process efficiency, yet the research on the development of titanium and particularly polytitanium salts remains very limited. In this study, the performance of recently developed polytitanium tetrachloride (PTC) Coagulant was compared with both titanium tetrachloride (TiCl 4 ) and a commonly used Coagulant, ferric chloride (FeCl 3 ) in terms of water quality parameters and floc properties. Compared with FeCl 3 Coagulant, titanium-based Coagulants had broader region of good flocculation in terms of pH and Coagulant dose. Further, they achieved higher removal of UV 254 and turbidity but lower dissolved organic carbon (DOC) removal. Charge neutralisation, physical entrapment of colloids within Coagulant precipitates and adsorption were found to be the main coagulation mechanisms for TiCl 4 while sweep coagulation and adsorption were found to play a more important role for both FeCl 3 and PTC. The aggregated flocs formed by PTC flocculation had the largest floc size of around 836 μm with the highest floc growth rate. A little distinction of the floc strength factor was found among the Coagulants tested (i.e. 44.8%, 44.2% and 38.9% for FeCl 3 , TiCl 4 and PTC respectively) while TiCl 4 Coagulant yielded the flocs with the highest floc recovery factor. This study indicates that Ti-based Coagulants are effective and promising Coagulants for water purification. Besides, the resulted flocculated sludge can be recycled and produce functional TiO 2 photocatalyst which is a significant advantage over conventional Coagulants.
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comparison of a novel polytitanium chloride Coagulant with polyaluminium chloride coagulation performance and floc characteristics
Journal of Environmental Management, 2015Co-Authors: Yanxia Zhao, Baoyu Gao, Sherub Phuntsho, Y Z Yang, J H Kim, Ho Kyong ShonAbstract:Polymerized inorganic Coagulants are increasingly being used in the water supply and wastewater treatment process, yet there is limited research on the development of polytitanium Coagulants. The aim of this study is to synthesize polytitanium chloride (PTC) Coagulants and investigate their coagulation behavior and floc characteristics for humic acid removal in comparison to polyaluminum chloride (PAC). The PTC samples with different B (molar ratios of OH/Ti) values were prepared using an instantaneous base-feeding method, employing sodium carbonate as the basification agent. The coagulation efficiency was significantly influenced by different B values. The results suggest that the humic acid removal increased with the increasing B value for PAC, while the inverse trend was observed for PTC. The optimum B value was chosen at 1.0 and 2.0 for PTC and PAC, respectively. Under the optimum Coagulant dose and initial solution pH conditions, the PTC Coagulant performed better than the PAC Coagulant and the floc properties were significantly improved in terms of floc growth rate and floc size. However, the PAC Coagulants produced flocs with better floc recoverability than the PTC Coagulants.
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coagulation by titanium tetrachloride for fulvic acid removal factors influencing coagulation efficiency and floc characteristics
Desalination, 2014Co-Authors: Yanxia Zhao, Baoyu Gao, Sherub Phuntsho, Guochen Zhang, Ho Kyong ShonAbstract:Abstract Coagulation efficiency of titanium tetrachloride (TiCl 4 ) was investigated for fulvic acid (FA) (as model organic matter) removal compared to traditional Coagulants — iron chloride (FeCl 3 ) and aluminum sulfate (Al 2 (SO 4 ) 3 ). The growth, breakage and regrowth nature of flocs formed by the three Coagulants were also comparatively evaluated under different coagulation conditions. Results indicated that TiCl 4 achieved higher removal of UV 278 (absorbance at 278 nm) and DOC (dissolved organic carbon) than FeCl 3 and Al 2 (SO 4 ) 3 , and TiCl 4 produced the largest flocs with the highest floc growth rate. The responses of floc to different operating parameters depend on the Coagulant used, while the floc breakage and re-aggregation were also significantly influenced by shear force and break-up period. Floc strength decayed with the increasing shear force, while the inverse trend was observed for floc recoverability. An extension in break-up period resulted in the deterioration of both floc strength and recoverability regardless of the Coagulants used. Flocs formed by TiCl 4 displayed the weakest recoverability after breakage by contrast to conventional Coagulants. Since TiCl 4 is only studied recently as a novel Coagulant, the comparative study of coagulation performance and floc characteristics of TiCl 4 against the traditional Coagulants provided valuable information for its wide application in the future.
Yanxia Zhao - One of the best experts on this subject based on the ideXlab platform.
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coagulation performance and floc characteristics of polytitanium tetrachloride and titanium tetrachloride compared with ferric chloride for coal mining wastewater treatment
Separation and Purification Technology, 2015Co-Authors: Yanxia Zhao, Laura Chekli, S H Park, J Galloux, Baoyu Gao, Sherub Phuntsho, Leonard D Tijing, Sanghyun Jeong, Ho Kyong ShonAbstract:Abstract The production and discharge of large volumes of wastewater during coal mining activities are one of the major environmental issues in Australia. Therefore, it is crucial to develop and optimise effective treatment processes for the safe disposal of coal mining wastewater (CMWW). In this study, we investigated the performance of a recently developed polytitanium tetrachloride (PTC) Coagulant and compared with the performance of titanium tetrachloride (TiCl 4 ) and the commonly used ferric chloride (FeCl 3 ) Coagulant for the treatment of CMWW from one of the coal mining sites in Australia. The use of Ti-based Coagulants is particularly attractive for the CMWW treatment due to the advantage of being able to recycle the sludge to produce functional titanium dioxide (TiO 2 ) photocatalyst; unlike the flocs formed using conventional Coagulants, which need to be disposed in landfill sites. The results showed that both PTC and TiCl 4 performed better than FeCl 3 in terms of turbidity, UV 254 and inorganic compounds (e.g. aluminium, copper or zinc) removal, however, PTC performed poorly in terms of dissolved organic carbon removal (i.e. less than 10%). While charge neutralisation and bridging adsorption were the main coagulation mechanisms identified for TiCl 4 treatment ; sweep coagulation and bridging adsorption seemed to play a more important role for both PTC and FeCl 3 treatments. The flocs formed by PTC coagulation achieved the largest floc size of around 900 μm with the highest floc growth rate. Both Ti-based Coagulants (i.e., PTC and TiCl 4 ) showed higher strength factor than FeCl 3 , while TiCl 4 Coagulant yielded the flocs with the highest recovery factor. This study indicates that Ti-based Coagulants are effective and promising Coagulants for the treatment of CMWW.
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comparison of a novel polytitanium chloride Coagulant with polyaluminium chloride coagulation performance and floc characteristics
Journal of Environmental Management, 2015Co-Authors: Yanxia Zhao, Baoyu Gao, Sherub Phuntsho, Y Z Yang, J H Kim, Ho Kyong ShonAbstract:Polymerized inorganic Coagulants are increasingly being used in the water supply and wastewater treatment process, yet there is limited research on the development of polytitanium Coagulants. The aim of this study is to synthesize polytitanium chloride (PTC) Coagulants and investigate their coagulation behavior and floc characteristics for humic acid removal in comparison to polyaluminum chloride (PAC). The PTC samples with different B (molar ratios of OH/Ti) values were prepared using an instantaneous base-feeding method, employing sodium carbonate as the basification agent. The coagulation efficiency was significantly influenced by different B values. The results suggest that the humic acid removal increased with the increasing B value for PAC, while the inverse trend was observed for PTC. The optimum B value was chosen at 1.0 and 2.0 for PTC and PAC, respectively. Under the optimum Coagulant dose and initial solution pH conditions, the PTC Coagulant performed better than the PAC Coagulant and the floc properties were significantly improved in terms of floc growth rate and floc size. However, the PAC Coagulants produced flocs with better floc recoverability than the PTC Coagulants.
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coagulation by titanium tetrachloride for fulvic acid removal factors influencing coagulation efficiency and floc characteristics
Desalination, 2014Co-Authors: Yanxia Zhao, Baoyu Gao, Sherub Phuntsho, Guochen Zhang, Ho Kyong ShonAbstract:Abstract Coagulation efficiency of titanium tetrachloride (TiCl 4 ) was investigated for fulvic acid (FA) (as model organic matter) removal compared to traditional Coagulants — iron chloride (FeCl 3 ) and aluminum sulfate (Al 2 (SO 4 ) 3 ). The growth, breakage and regrowth nature of flocs formed by the three Coagulants were also comparatively evaluated under different coagulation conditions. Results indicated that TiCl 4 achieved higher removal of UV 278 (absorbance at 278 nm) and DOC (dissolved organic carbon) than FeCl 3 and Al 2 (SO 4 ) 3 , and TiCl 4 produced the largest flocs with the highest floc growth rate. The responses of floc to different operating parameters depend on the Coagulant used, while the floc breakage and re-aggregation were also significantly influenced by shear force and break-up period. Floc strength decayed with the increasing shear force, while the inverse trend was observed for floc recoverability. An extension in break-up period resulted in the deterioration of both floc strength and recoverability regardless of the Coagulants used. Flocs formed by TiCl 4 displayed the weakest recoverability after breakage by contrast to conventional Coagulants. Since TiCl 4 is only studied recently as a novel Coagulant, the comparative study of coagulation performance and floc characteristics of TiCl 4 against the traditional Coagulants provided valuable information for its wide application in the future.
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coagulation performance evaluation of sodium alginate used as Coagulant aid with aluminum sulfate iron chloride and titanium tetrachloride
Desalination, 2012Co-Authors: Yanxia Zhao, Yang Wang, Ho Kyong ShonAbstract:Abstract Coagulation–flocculation was applied to humic acid–kaolin synthetic water samples, using sodium alginate (SA) as a Coagulant aid with primary Coagulants used: aluminum sulfate (Al2(SO4)3), iron chloride (FeCl3) and titanium tetrachloride (TiCl4). The corresponding dual-Coagulants were dented as Al2(SO4)3–SA, FeCl3–SA and TiCl4–SA by dosing SA 30 s after primary Coagulants addition. Coagulation performance was investigated in terms of turbidity reduction and dissolved organic carbon (DOC) removal and the flocs were characterized in terms of size, growth rate, strength, recoverability and structure through on‐line monitoring of the coagulation process using Mastersizer 2000. The results showed that dual-Coagulants could remove HA effectively with appropriate SA doses. Primary Coagulants plus SA exhibited an apparent improvement in both floc growth rate and floc size. Besides, floc recoverability was significantly increased. It was suspected that SA addition may have a positive effect on the solid/liquid separation process. However, dual-Coagulants gave the flocs with more open structure.
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anionic polymer compound bioflocculant as a Coagulant aid with aluminum sulfate and titanium tetrachloride
Bioresource Technology, 2012Co-Authors: Yanxia Zhao, Yang Wang, Ho Kyong Shon, Jongoh Kim, Baoyu Gao, Qinyan YueAbstract:Abstract The objectives of this study are to investigate the impacts of anionic polymer compound bioflocculant (CBF) as a Coagulant aid on coagulation performance and floc characteristics with titanium tetrachloride (TiCl4) and aluminum sulfate (Al2(SO4)3). The effect of dosing sequence was also investigated. Floc size, breakage, regrowth and floc fractal dimension were examined using a laser diffraction instrument. The results showed that CBF with TiCl4 or Al2(SO4)3 Coagulants exhibited synergistic effects by promoting dissolved organic carbon (DOC) removal. For both TiCl4 and Al2(SO4)3, the floc recoverability was improved by CBF addition, and the flocs formed by TiCl4 and the corresponding dual-Coagulants showed weaker recovery ability than those by Al2(SO4)3 and the corresponding dual-Coagulants. Fractal dimension analysis demonstrated that the floc fractal dimension values increased with the increasing Coagulant dose. The effect of CBF on fractal dimension of the flocs generated by TiCl4 was different from that of Al2(SO4)3.
Baoyu Gao - One of the best experts on this subject based on the ideXlab platform.
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coagulation performance and floc characteristics of polytitanium tetrachloride and titanium tetrachloride compared with ferric chloride for coal mining wastewater treatment
Separation and Purification Technology, 2015Co-Authors: Yanxia Zhao, Laura Chekli, S H Park, J Galloux, Baoyu Gao, Sherub Phuntsho, Leonard D Tijing, Sanghyun Jeong, Ho Kyong ShonAbstract:Abstract The production and discharge of large volumes of wastewater during coal mining activities are one of the major environmental issues in Australia. Therefore, it is crucial to develop and optimise effective treatment processes for the safe disposal of coal mining wastewater (CMWW). In this study, we investigated the performance of a recently developed polytitanium tetrachloride (PTC) Coagulant and compared with the performance of titanium tetrachloride (TiCl 4 ) and the commonly used ferric chloride (FeCl 3 ) Coagulant for the treatment of CMWW from one of the coal mining sites in Australia. The use of Ti-based Coagulants is particularly attractive for the CMWW treatment due to the advantage of being able to recycle the sludge to produce functional titanium dioxide (TiO 2 ) photocatalyst; unlike the flocs formed using conventional Coagulants, which need to be disposed in landfill sites. The results showed that both PTC and TiCl 4 performed better than FeCl 3 in terms of turbidity, UV 254 and inorganic compounds (e.g. aluminium, copper or zinc) removal, however, PTC performed poorly in terms of dissolved organic carbon removal (i.e. less than 10%). While charge neutralisation and bridging adsorption were the main coagulation mechanisms identified for TiCl 4 treatment ; sweep coagulation and bridging adsorption seemed to play a more important role for both PTC and FeCl 3 treatments. The flocs formed by PTC coagulation achieved the largest floc size of around 900 μm with the highest floc growth rate. Both Ti-based Coagulants (i.e., PTC and TiCl 4 ) showed higher strength factor than FeCl 3 , while TiCl 4 Coagulant yielded the flocs with the highest recovery factor. This study indicates that Ti-based Coagulants are effective and promising Coagulants for the treatment of CMWW.
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coagulation performance and floc characteristics of polytitanium tetrachloride ptc compared with titanium tetrachloride ticl4 and iron salts in humic acid kaolin synthetic water treatment
Separation and Purification Technology, 2015Co-Authors: Laura Chekli, J Galloux, Yi Zhao, Baoyu Gao, Ho Kyong ShonAbstract:Abstract Polymeric metal Coagulants are increasingly used to improve the coagulation/flocculation process efficiency, yet the research on the development of titanium and particularly polytitanium salts remains very limited. In this study, the performance of recently developed polytitanium tetrachloride (PTC) Coagulant was compared with both titanium tetrachloride (TiCl 4 ) and a commonly used Coagulant, ferric chloride (FeCl 3 ) in terms of water quality parameters and floc properties. Compared with FeCl 3 Coagulant, titanium-based Coagulants had broader region of good flocculation in terms of pH and Coagulant dose. Further, they achieved higher removal of UV 254 and turbidity but lower dissolved organic carbon (DOC) removal. Charge neutralisation, physical entrapment of colloids within Coagulant precipitates and adsorption were found to be the main coagulation mechanisms for TiCl 4 while sweep coagulation and adsorption were found to play a more important role for both FeCl 3 and PTC. The aggregated flocs formed by PTC flocculation had the largest floc size of around 836 μm with the highest floc growth rate. A little distinction of the floc strength factor was found among the Coagulants tested (i.e. 44.8%, 44.2% and 38.9% for FeCl 3 , TiCl 4 and PTC respectively) while TiCl 4 Coagulant yielded the flocs with the highest floc recovery factor. This study indicates that Ti-based Coagulants are effective and promising Coagulants for water purification. Besides, the resulted flocculated sludge can be recycled and produce functional TiO 2 photocatalyst which is a significant advantage over conventional Coagulants.
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comparison of a novel polytitanium chloride Coagulant with polyaluminium chloride coagulation performance and floc characteristics
Journal of Environmental Management, 2015Co-Authors: Yanxia Zhao, Baoyu Gao, Sherub Phuntsho, Y Z Yang, J H Kim, Ho Kyong ShonAbstract:Polymerized inorganic Coagulants are increasingly being used in the water supply and wastewater treatment process, yet there is limited research on the development of polytitanium Coagulants. The aim of this study is to synthesize polytitanium chloride (PTC) Coagulants and investigate their coagulation behavior and floc characteristics for humic acid removal in comparison to polyaluminum chloride (PAC). The PTC samples with different B (molar ratios of OH/Ti) values were prepared using an instantaneous base-feeding method, employing sodium carbonate as the basification agent. The coagulation efficiency was significantly influenced by different B values. The results suggest that the humic acid removal increased with the increasing B value for PAC, while the inverse trend was observed for PTC. The optimum B value was chosen at 1.0 and 2.0 for PTC and PAC, respectively. Under the optimum Coagulant dose and initial solution pH conditions, the PTC Coagulant performed better than the PAC Coagulant and the floc properties were significantly improved in terms of floc growth rate and floc size. However, the PAC Coagulants produced flocs with better floc recoverability than the PTC Coagulants.
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coagulation by titanium tetrachloride for fulvic acid removal factors influencing coagulation efficiency and floc characteristics
Desalination, 2014Co-Authors: Yanxia Zhao, Baoyu Gao, Sherub Phuntsho, Guochen Zhang, Ho Kyong ShonAbstract:Abstract Coagulation efficiency of titanium tetrachloride (TiCl 4 ) was investigated for fulvic acid (FA) (as model organic matter) removal compared to traditional Coagulants — iron chloride (FeCl 3 ) and aluminum sulfate (Al 2 (SO 4 ) 3 ). The growth, breakage and regrowth nature of flocs formed by the three Coagulants were also comparatively evaluated under different coagulation conditions. Results indicated that TiCl 4 achieved higher removal of UV 278 (absorbance at 278 nm) and DOC (dissolved organic carbon) than FeCl 3 and Al 2 (SO 4 ) 3 , and TiCl 4 produced the largest flocs with the highest floc growth rate. The responses of floc to different operating parameters depend on the Coagulant used, while the floc breakage and re-aggregation were also significantly influenced by shear force and break-up period. Floc strength decayed with the increasing shear force, while the inverse trend was observed for floc recoverability. An extension in break-up period resulted in the deterioration of both floc strength and recoverability regardless of the Coagulants used. Flocs formed by TiCl 4 displayed the weakest recoverability after breakage by contrast to conventional Coagulants. Since TiCl 4 is only studied recently as a novel Coagulant, the comparative study of coagulation performance and floc characteristics of TiCl 4 against the traditional Coagulants provided valuable information for its wide application in the future.
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anionic polymer compound bioflocculant as a Coagulant aid with aluminum sulfate and titanium tetrachloride
Bioresource Technology, 2012Co-Authors: Yanxia Zhao, Yang Wang, Ho Kyong Shon, Jongoh Kim, Baoyu Gao, Qinyan YueAbstract:Abstract The objectives of this study are to investigate the impacts of anionic polymer compound bioflocculant (CBF) as a Coagulant aid on coagulation performance and floc characteristics with titanium tetrachloride (TiCl4) and aluminum sulfate (Al2(SO4)3). The effect of dosing sequence was also investigated. Floc size, breakage, regrowth and floc fractal dimension were examined using a laser diffraction instrument. The results showed that CBF with TiCl4 or Al2(SO4)3 Coagulants exhibited synergistic effects by promoting dissolved organic carbon (DOC) removal. For both TiCl4 and Al2(SO4)3, the floc recoverability was improved by CBF addition, and the flocs formed by TiCl4 and the corresponding dual-Coagulants showed weaker recovery ability than those by Al2(SO4)3 and the corresponding dual-Coagulants. Fractal dimension analysis demonstrated that the floc fractal dimension values increased with the increasing Coagulant dose. The effect of CBF on fractal dimension of the flocs generated by TiCl4 was different from that of Al2(SO4)3.
Laura Chekli - One of the best experts on this subject based on the ideXlab platform.
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coagulation performance and floc characteristics of polytitanium tetrachloride ptc compared with titanium tetrachloride ticl4 and ferric chloride fecl3 in algal turbid water
Separation and Purification Technology, 2017Co-Authors: Laura Chekli, C Eripret, S H Park, S A A Tabatabai, O Vronska, Bojan Tamburic, Jongoh Kim, Ho Kyong ShonAbstract:Abstract Seasonal green algae blooms in freshwaters have raised attention on the need to develop novel effective treatment processes for the removal of algae in water. In the present study, the performance of newly developed polytitanium tetrachloride (PTC) Coagulant for the removal of freshwater microalga Chlorella vulgaris has been investigated and compared with titanium tetrachloride (TiCl 4 ) Coagulant and the conventional ferric chloride (FeCl 3 ) Coagulant. The main benefit of using titanium-based Coagulants is that the sludge produced after flocculation may be recycled into a valuable product: titanium dioxide photocatalyst. Both titanium-based Coagulants achieved good flocculation over a broader pH range and Coagulant dose compared to conventional FeCl 3 Coagulant. All three Coagulants achieved comparable performance in terms of turbidity removal (i.e. turbidity removal efficiency >97%); although TiCl 4 performed slightly better at the lower tested dose (i.e. 3 and also grew at a faster rate. This study indicates that Ti-based Coagulants are effective and promising Coagulants for algae removal in water.
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coagulation performance and floc characteristics of polytitanium tetrachloride and titanium tetrachloride compared with ferric chloride for coal mining wastewater treatment
Separation and Purification Technology, 2015Co-Authors: Yanxia Zhao, Laura Chekli, S H Park, J Galloux, Baoyu Gao, Sherub Phuntsho, Leonard D Tijing, Sanghyun Jeong, Ho Kyong ShonAbstract:Abstract The production and discharge of large volumes of wastewater during coal mining activities are one of the major environmental issues in Australia. Therefore, it is crucial to develop and optimise effective treatment processes for the safe disposal of coal mining wastewater (CMWW). In this study, we investigated the performance of a recently developed polytitanium tetrachloride (PTC) Coagulant and compared with the performance of titanium tetrachloride (TiCl 4 ) and the commonly used ferric chloride (FeCl 3 ) Coagulant for the treatment of CMWW from one of the coal mining sites in Australia. The use of Ti-based Coagulants is particularly attractive for the CMWW treatment due to the advantage of being able to recycle the sludge to produce functional titanium dioxide (TiO 2 ) photocatalyst; unlike the flocs formed using conventional Coagulants, which need to be disposed in landfill sites. The results showed that both PTC and TiCl 4 performed better than FeCl 3 in terms of turbidity, UV 254 and inorganic compounds (e.g. aluminium, copper or zinc) removal, however, PTC performed poorly in terms of dissolved organic carbon removal (i.e. less than 10%). While charge neutralisation and bridging adsorption were the main coagulation mechanisms identified for TiCl 4 treatment ; sweep coagulation and bridging adsorption seemed to play a more important role for both PTC and FeCl 3 treatments. The flocs formed by PTC coagulation achieved the largest floc size of around 900 μm with the highest floc growth rate. Both Ti-based Coagulants (i.e., PTC and TiCl 4 ) showed higher strength factor than FeCl 3 , while TiCl 4 Coagulant yielded the flocs with the highest recovery factor. This study indicates that Ti-based Coagulants are effective and promising Coagulants for the treatment of CMWW.
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coagulation performance and floc characteristics of polytitanium tetrachloride ptc compared with titanium tetrachloride ticl4 and iron salts in humic acid kaolin synthetic water treatment
Separation and Purification Technology, 2015Co-Authors: Laura Chekli, J Galloux, Yi Zhao, Baoyu Gao, Ho Kyong ShonAbstract:Abstract Polymeric metal Coagulants are increasingly used to improve the coagulation/flocculation process efficiency, yet the research on the development of titanium and particularly polytitanium salts remains very limited. In this study, the performance of recently developed polytitanium tetrachloride (PTC) Coagulant was compared with both titanium tetrachloride (TiCl 4 ) and a commonly used Coagulant, ferric chloride (FeCl 3 ) in terms of water quality parameters and floc properties. Compared with FeCl 3 Coagulant, titanium-based Coagulants had broader region of good flocculation in terms of pH and Coagulant dose. Further, they achieved higher removal of UV 254 and turbidity but lower dissolved organic carbon (DOC) removal. Charge neutralisation, physical entrapment of colloids within Coagulant precipitates and adsorption were found to be the main coagulation mechanisms for TiCl 4 while sweep coagulation and adsorption were found to play a more important role for both FeCl 3 and PTC. The aggregated flocs formed by PTC flocculation had the largest floc size of around 836 μm with the highest floc growth rate. A little distinction of the floc strength factor was found among the Coagulants tested (i.e. 44.8%, 44.2% and 38.9% for FeCl 3 , TiCl 4 and PTC respectively) while TiCl 4 Coagulant yielded the flocs with the highest floc recovery factor. This study indicates that Ti-based Coagulants are effective and promising Coagulants for water purification. Besides, the resulted flocculated sludge can be recycled and produce functional TiO 2 photocatalyst which is a significant advantage over conventional Coagulants.
J Galloux - One of the best experts on this subject based on the ideXlab platform.
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coagulation performance and floc characteristics of polytitanium tetrachloride and titanium tetrachloride compared with ferric chloride for coal mining wastewater treatment
Separation and Purification Technology, 2015Co-Authors: Yanxia Zhao, Laura Chekli, S H Park, J Galloux, Baoyu Gao, Sherub Phuntsho, Leonard D Tijing, Sanghyun Jeong, Ho Kyong ShonAbstract:Abstract The production and discharge of large volumes of wastewater during coal mining activities are one of the major environmental issues in Australia. Therefore, it is crucial to develop and optimise effective treatment processes for the safe disposal of coal mining wastewater (CMWW). In this study, we investigated the performance of a recently developed polytitanium tetrachloride (PTC) Coagulant and compared with the performance of titanium tetrachloride (TiCl 4 ) and the commonly used ferric chloride (FeCl 3 ) Coagulant for the treatment of CMWW from one of the coal mining sites in Australia. The use of Ti-based Coagulants is particularly attractive for the CMWW treatment due to the advantage of being able to recycle the sludge to produce functional titanium dioxide (TiO 2 ) photocatalyst; unlike the flocs formed using conventional Coagulants, which need to be disposed in landfill sites. The results showed that both PTC and TiCl 4 performed better than FeCl 3 in terms of turbidity, UV 254 and inorganic compounds (e.g. aluminium, copper or zinc) removal, however, PTC performed poorly in terms of dissolved organic carbon removal (i.e. less than 10%). While charge neutralisation and bridging adsorption were the main coagulation mechanisms identified for TiCl 4 treatment ; sweep coagulation and bridging adsorption seemed to play a more important role for both PTC and FeCl 3 treatments. The flocs formed by PTC coagulation achieved the largest floc size of around 900 μm with the highest floc growth rate. Both Ti-based Coagulants (i.e., PTC and TiCl 4 ) showed higher strength factor than FeCl 3 , while TiCl 4 Coagulant yielded the flocs with the highest recovery factor. This study indicates that Ti-based Coagulants are effective and promising Coagulants for the treatment of CMWW.
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coagulation performance and floc characteristics of polytitanium tetrachloride ptc compared with titanium tetrachloride ticl4 and iron salts in humic acid kaolin synthetic water treatment
Separation and Purification Technology, 2015Co-Authors: Laura Chekli, J Galloux, Yi Zhao, Baoyu Gao, Ho Kyong ShonAbstract:Abstract Polymeric metal Coagulants are increasingly used to improve the coagulation/flocculation process efficiency, yet the research on the development of titanium and particularly polytitanium salts remains very limited. In this study, the performance of recently developed polytitanium tetrachloride (PTC) Coagulant was compared with both titanium tetrachloride (TiCl 4 ) and a commonly used Coagulant, ferric chloride (FeCl 3 ) in terms of water quality parameters and floc properties. Compared with FeCl 3 Coagulant, titanium-based Coagulants had broader region of good flocculation in terms of pH and Coagulant dose. Further, they achieved higher removal of UV 254 and turbidity but lower dissolved organic carbon (DOC) removal. Charge neutralisation, physical entrapment of colloids within Coagulant precipitates and adsorption were found to be the main coagulation mechanisms for TiCl 4 while sweep coagulation and adsorption were found to play a more important role for both FeCl 3 and PTC. The aggregated flocs formed by PTC flocculation had the largest floc size of around 836 μm with the highest floc growth rate. A little distinction of the floc strength factor was found among the Coagulants tested (i.e. 44.8%, 44.2% and 38.9% for FeCl 3 , TiCl 4 and PTC respectively) while TiCl 4 Coagulant yielded the flocs with the highest floc recovery factor. This study indicates that Ti-based Coagulants are effective and promising Coagulants for water purification. Besides, the resulted flocculated sludge can be recycled and produce functional TiO 2 photocatalyst which is a significant advantage over conventional Coagulants.