The Experts below are selected from a list of 129 Experts worldwide ranked by ideXlab platform
Renjie Dong - One of the best experts on this subject based on the ideXlab platform.
-
How the novel integration of electrolysis in tidal flow constructed wetlands intensifies nutrient removal and odor control.
Bioresource Technology, 2014Co-Authors: Xinxin Ju, Shubiao Wu, Yansheng Zhang, Xu Huang, Renjie DongAbstract:Abstract Intensified nutrient removal and odor control in a novel electrolysis-integrated tidal flow constructed wetland were evaluated. The average removal efficiencies of COD and NH 4 + -N were above 85% and 80% in the two experimental wetlands at influent COD concentration of 300 mg/L and ammonium nitrogen concentration of 60 mg/L regardless of electrolysis integration. Effluent nitrate concentration decreased from 2.5 mg/L to 0.5 mg/L with the reduction in current intensity from 1.5 mA/cm 2 to 0.57 mA/cm 2 . This result reveals the important role of current intensity in nitrogen transformation. Owing to the ferrous and ferric Iron Coagulant formed through the electro-dissolution of the Iron anode, electrolysis integration not only exerted a positive effect on phosphorus removal but also effectively inhibited sulfide accumulation for odor control. Although electrolysis operation enhanced nutrient removal and promoted the emission of CH 4 , no significant difference was observed in the microbial communities and abundance of the two experimental wetlands.
-
Intensified nitrogen and phosphorus removal in a novel electrolysis-integrated tidal flow constructed wetland system
Water Research, 2014Co-Authors: Xinxin Ju, Shubiao Wu, Yansheng Zhang, Renjie DongAbstract:Abstract A novel electrolysis-integrated tidal flow constructed wetland (CW) system was developed in this study. The dynamics of intensified nitrogen and phosphorus removal and that of hydrogen sulphide control were evaluated. Ammonium removal of up to 80% was achieved with an inflow concentration of 60 mg/L in wetland systems with and without electrolysis integration. Effluent nitrate concentration decreased from 2 mg/L to less than 0.5 mg/L with the decrease in current intensity from 1.5 mA/cm 2 to 0.57 mA/cm 2 in the electrolysis-integrated wetland system, thus indicating that the current intensity of electrolysis plays an important role in nitrogen transformations. Phosphorus removal was significantly enhanced, exceeding 95% in the electrolysis-integrated CW system because of the in-situ formation of a ferric Iron Coagulant through the electro-dissolution of a sacrificial Iron anode. Moreover, the electrolyzed wetland system effectively inhibits sulphide accumulation as a result of a sulphide precipitation coupled with ferrous-Iron electro-dissolution and/or an inhibition of bacterial sulphate reduction under increased aerobic conditions.
-
Intensified nitrogen and phosphorus removal in a novel electrolysis-integrated tidal flow constructed wetland system
Water Research, 2014Co-Authors: Xinxin Ju, Shubiao Wu, Yansheng Zhang, Renjie DongAbstract:A novel electrolysis-integrated tidal flow constructed wetland (CW) system was developed in this study. The dynamics of intensified nitrogen and phosphorus removal and that of hydrogen sulphide control were evaluated. Ammonium removal of up to 80% was achieved with an inflow concentration of 60mg/L in wetland systems with and without electrolysis integration. Effluent nitrate concentration decreased from 2mg/L to less than 0.5mg/L with the decrease in current intensity from 1.5mA/cm2 to 0.57mA/cm2 in the electrolysis-integrated wetland system, thus indicating that the current intensity of electrolysis plays an important role in nitrogen transformations. Phosphorus removal was significantly enhanced, exceeding 95% in the electrolysis-integrated CW system because of the in-situ formation of a ferric Iron Coagulant through the electro-dissolution of a sacrificial Iron anode. Moreover, the electrolyzed wetland system effectively inhibits sulphide accumulation as a result of a sulphide precipitation coupled with ferrous-Iron electro-dissolution and/or an inhibition of bacterial sulphate reduction under increased aerobic conditions. © 2014 Elsevier Ltd.
Xinxin Ju - One of the best experts on this subject based on the ideXlab platform.
-
How the novel integration of electrolysis in tidal flow constructed wetlands intensifies nutrient removal and odor control.
Bioresource Technology, 2014Co-Authors: Xinxin Ju, Shubiao Wu, Yansheng Zhang, Xu Huang, Renjie DongAbstract:Abstract Intensified nutrient removal and odor control in a novel electrolysis-integrated tidal flow constructed wetland were evaluated. The average removal efficiencies of COD and NH 4 + -N were above 85% and 80% in the two experimental wetlands at influent COD concentration of 300 mg/L and ammonium nitrogen concentration of 60 mg/L regardless of electrolysis integration. Effluent nitrate concentration decreased from 2.5 mg/L to 0.5 mg/L with the reduction in current intensity from 1.5 mA/cm 2 to 0.57 mA/cm 2 . This result reveals the important role of current intensity in nitrogen transformation. Owing to the ferrous and ferric Iron Coagulant formed through the electro-dissolution of the Iron anode, electrolysis integration not only exerted a positive effect on phosphorus removal but also effectively inhibited sulfide accumulation for odor control. Although electrolysis operation enhanced nutrient removal and promoted the emission of CH 4 , no significant difference was observed in the microbial communities and abundance of the two experimental wetlands.
-
Intensified nitrogen and phosphorus removal in a novel electrolysis-integrated tidal flow constructed wetland system
Water Research, 2014Co-Authors: Xinxin Ju, Shubiao Wu, Yansheng Zhang, Renjie DongAbstract:Abstract A novel electrolysis-integrated tidal flow constructed wetland (CW) system was developed in this study. The dynamics of intensified nitrogen and phosphorus removal and that of hydrogen sulphide control were evaluated. Ammonium removal of up to 80% was achieved with an inflow concentration of 60 mg/L in wetland systems with and without electrolysis integration. Effluent nitrate concentration decreased from 2 mg/L to less than 0.5 mg/L with the decrease in current intensity from 1.5 mA/cm 2 to 0.57 mA/cm 2 in the electrolysis-integrated wetland system, thus indicating that the current intensity of electrolysis plays an important role in nitrogen transformations. Phosphorus removal was significantly enhanced, exceeding 95% in the electrolysis-integrated CW system because of the in-situ formation of a ferric Iron Coagulant through the electro-dissolution of a sacrificial Iron anode. Moreover, the electrolyzed wetland system effectively inhibits sulphide accumulation as a result of a sulphide precipitation coupled with ferrous-Iron electro-dissolution and/or an inhibition of bacterial sulphate reduction under increased aerobic conditions.
-
Intensified nitrogen and phosphorus removal in a novel electrolysis-integrated tidal flow constructed wetland system
Water Research, 2014Co-Authors: Xinxin Ju, Shubiao Wu, Yansheng Zhang, Renjie DongAbstract:A novel electrolysis-integrated tidal flow constructed wetland (CW) system was developed in this study. The dynamics of intensified nitrogen and phosphorus removal and that of hydrogen sulphide control were evaluated. Ammonium removal of up to 80% was achieved with an inflow concentration of 60mg/L in wetland systems with and without electrolysis integration. Effluent nitrate concentration decreased from 2mg/L to less than 0.5mg/L with the decrease in current intensity from 1.5mA/cm2 to 0.57mA/cm2 in the electrolysis-integrated wetland system, thus indicating that the current intensity of electrolysis plays an important role in nitrogen transformations. Phosphorus removal was significantly enhanced, exceeding 95% in the electrolysis-integrated CW system because of the in-situ formation of a ferric Iron Coagulant through the electro-dissolution of a sacrificial Iron anode. Moreover, the electrolyzed wetland system effectively inhibits sulphide accumulation as a result of a sulphide precipitation coupled with ferrous-Iron electro-dissolution and/or an inhibition of bacterial sulphate reduction under increased aerobic conditions. © 2014 Elsevier Ltd.
Yasumoto Magara - One of the best experts on this subject based on the ideXlab platform.
-
NF membrane fouling by aluminum and Iron Coagulant residuals after coagulation–MF pretreatment
Desalination, 2020Co-Authors: Koichi Ohno, Yoshihiko Matsui, Masaki Itoh, Yoshifumi Oguchi, Takuya Kondo, Yosuke Konno, Taku Matsushita, Yasumoto MagaraAbstract:The effects of Coagulant residuals on fouling of a nanofiltration (NF) membrane were investigated. Experiments were carried out with a laboratory-scale microfiltration (MF)-NF setup and a pilot MF-NF plant. In the laboratory-scale experiments, NF feed water was pretreated with poly-aluminum chloride (PACl) or alum followed by MF. NF membrane permeability declined when the feed water contained residual aluminum at 18 μg/L or more, but not when it was lower than 9 μg/L. When pretreated with ferric chloride, no substantial decline of NF membrane permeability was observed: residual Iron did not affect the permeability. When SiO2 was added to the water before the pretreatment with PACl, the NF membrane permeability declined at about double the speed. Thermodynamic calculations and elemental analysis of foulants recovered from the membranes indicated that the majority of inorganic foulants were compounds composed of aluminum, silicate, and possibly potassium. In the pilot plant, NF feed was pretreated by PACl. Transmembrane pressure for NF doubled over 4.5 months of operation. Although the aluminum concentration in the NF feed was not high (30 μg/L), analysis of membrane foulants revealed excessive accumulation of aluminum and silicate, also suggesting that aluminum residuals caused the membrane fouling by alumino-silicates or aluminum hydroxide
-
nf membrane fouling by aluminum and Iron Coagulant residuals after coagulation mf pretreatment
Desalination, 2010Co-Authors: Koichi Ohno, Yoshihiko Matsui, Masaki Itoh, Yoshifumi Oguchi, Takuya Kondo, Yosuke Konno, Taku Matsushita, Yasumoto MagaraAbstract:Abstract The effects of Coagulant residuals on fouling of a nanofiltration (NF) membrane were investigated. Experiments were carried out with a laboratory-scale microfiltration (MF)–NF setup and a pilot MF–NF plant. In the laboratory-scale experiments, NF feed water was pretreated with poly-aluminum chloride (PACl) or alum followed by MF. NF membrane permeability declined when the feed water contained residual aluminum at 18 μg/L or more, but not when it was lower than 9 μg/L. When pretreated with ferric chloride, no substantial decline of NF membrane permeability was observed; residual Iron did not affect the permeability. When SiO 2 was added to the water before the pretreatment with PACl, the NF membrane permeability declined at about double the speed. Thermodynamic calculations and elemental analysis of foulants recovered from the membranes indicated that the majority of inorganic foulants were compounds composed of aluminum, silicate, and possibly potassium. In the pilot plant, NF feed was pretreated by PACl. Transmembrane pressure for NF doubled over 4.5 months of operation. Although the aluminum concentration in the NF feed was not high (30 μg/L), analysis of membrane foulants revealed excessive accumulation of aluminum and silicate, also suggesting that aluminum residuals caused the membrane fouling by alumino-silicates or aluminum hydroxide.
-
Practical design of flocculator for new polymeric inorganic Coagulant: PSI
Water Science & Technology: Water Supply, 2004Co-Authors: Koichi Ohno, M. Uchiyama, M. Saito, T. Kamei, Yasumoto MagaraAbstract:Physical characteristics of flocs formed by new polymeric inorganic Coagulant, polysilicato-Iron Coagulant (PSI) were investigated using kaolinite clay suspended water as test water. Floc density was determined by measuring floc settling velocity and spherical equivalent floc diameter. The floc density function proposed by Tambo and Watanabe could be applied to PSI. Flocs formed by PSI showed higher floc density than those formed by alum at the same floc size. Floc size distribution after the rapid mixing was also determined. PSI could produce well-grown flocs at the stirring speed of 300 rpm. Stirring at 300 rpm for 7 minutes, residual turbidity after 15 minute sedimentation became lower than rapid mixing at 120 rpm for 5 minutes followed by slow mixing at 40 rpm for 25 minutes. Flocs formed by PSI was much stronger than those formed by alum. Using the data obtained, the design parameters of flocculator by use of PSI were estimated following Tambo and Watanabe's procedure. According to the estimation, it was suggested that rapid mixing process alone can make well-grown flocs and slow mixing process, which is essential for the conventional water purification system using aluminium Coagulants, can be eliminated by use of PSI.
Shubiao Wu - One of the best experts on this subject based on the ideXlab platform.
-
How the novel integration of electrolysis in tidal flow constructed wetlands intensifies nutrient removal and odor control.
Bioresource Technology, 2014Co-Authors: Xinxin Ju, Shubiao Wu, Yansheng Zhang, Xu Huang, Renjie DongAbstract:Abstract Intensified nutrient removal and odor control in a novel electrolysis-integrated tidal flow constructed wetland were evaluated. The average removal efficiencies of COD and NH 4 + -N were above 85% and 80% in the two experimental wetlands at influent COD concentration of 300 mg/L and ammonium nitrogen concentration of 60 mg/L regardless of electrolysis integration. Effluent nitrate concentration decreased from 2.5 mg/L to 0.5 mg/L with the reduction in current intensity from 1.5 mA/cm 2 to 0.57 mA/cm 2 . This result reveals the important role of current intensity in nitrogen transformation. Owing to the ferrous and ferric Iron Coagulant formed through the electro-dissolution of the Iron anode, electrolysis integration not only exerted a positive effect on phosphorus removal but also effectively inhibited sulfide accumulation for odor control. Although electrolysis operation enhanced nutrient removal and promoted the emission of CH 4 , no significant difference was observed in the microbial communities and abundance of the two experimental wetlands.
-
Intensified nitrogen and phosphorus removal in a novel electrolysis-integrated tidal flow constructed wetland system
Water Research, 2014Co-Authors: Xinxin Ju, Shubiao Wu, Yansheng Zhang, Renjie DongAbstract:Abstract A novel electrolysis-integrated tidal flow constructed wetland (CW) system was developed in this study. The dynamics of intensified nitrogen and phosphorus removal and that of hydrogen sulphide control were evaluated. Ammonium removal of up to 80% was achieved with an inflow concentration of 60 mg/L in wetland systems with and without electrolysis integration. Effluent nitrate concentration decreased from 2 mg/L to less than 0.5 mg/L with the decrease in current intensity from 1.5 mA/cm 2 to 0.57 mA/cm 2 in the electrolysis-integrated wetland system, thus indicating that the current intensity of electrolysis plays an important role in nitrogen transformations. Phosphorus removal was significantly enhanced, exceeding 95% in the electrolysis-integrated CW system because of the in-situ formation of a ferric Iron Coagulant through the electro-dissolution of a sacrificial Iron anode. Moreover, the electrolyzed wetland system effectively inhibits sulphide accumulation as a result of a sulphide precipitation coupled with ferrous-Iron electro-dissolution and/or an inhibition of bacterial sulphate reduction under increased aerobic conditions.
-
Intensified nitrogen and phosphorus removal in a novel electrolysis-integrated tidal flow constructed wetland system
Water Research, 2014Co-Authors: Xinxin Ju, Shubiao Wu, Yansheng Zhang, Renjie DongAbstract:A novel electrolysis-integrated tidal flow constructed wetland (CW) system was developed in this study. The dynamics of intensified nitrogen and phosphorus removal and that of hydrogen sulphide control were evaluated. Ammonium removal of up to 80% was achieved with an inflow concentration of 60mg/L in wetland systems with and without electrolysis integration. Effluent nitrate concentration decreased from 2mg/L to less than 0.5mg/L with the decrease in current intensity from 1.5mA/cm2 to 0.57mA/cm2 in the electrolysis-integrated wetland system, thus indicating that the current intensity of electrolysis plays an important role in nitrogen transformations. Phosphorus removal was significantly enhanced, exceeding 95% in the electrolysis-integrated CW system because of the in-situ formation of a ferric Iron Coagulant through the electro-dissolution of a sacrificial Iron anode. Moreover, the electrolyzed wetland system effectively inhibits sulphide accumulation as a result of a sulphide precipitation coupled with ferrous-Iron electro-dissolution and/or an inhibition of bacterial sulphate reduction under increased aerobic conditions. © 2014 Elsevier Ltd.
Yansheng Zhang - One of the best experts on this subject based on the ideXlab platform.
-
How the novel integration of electrolysis in tidal flow constructed wetlands intensifies nutrient removal and odor control.
Bioresource Technology, 2014Co-Authors: Xinxin Ju, Shubiao Wu, Yansheng Zhang, Xu Huang, Renjie DongAbstract:Abstract Intensified nutrient removal and odor control in a novel electrolysis-integrated tidal flow constructed wetland were evaluated. The average removal efficiencies of COD and NH 4 + -N were above 85% and 80% in the two experimental wetlands at influent COD concentration of 300 mg/L and ammonium nitrogen concentration of 60 mg/L regardless of electrolysis integration. Effluent nitrate concentration decreased from 2.5 mg/L to 0.5 mg/L with the reduction in current intensity from 1.5 mA/cm 2 to 0.57 mA/cm 2 . This result reveals the important role of current intensity in nitrogen transformation. Owing to the ferrous and ferric Iron Coagulant formed through the electro-dissolution of the Iron anode, electrolysis integration not only exerted a positive effect on phosphorus removal but also effectively inhibited sulfide accumulation for odor control. Although electrolysis operation enhanced nutrient removal and promoted the emission of CH 4 , no significant difference was observed in the microbial communities and abundance of the two experimental wetlands.
-
Intensified nitrogen and phosphorus removal in a novel electrolysis-integrated tidal flow constructed wetland system
Water Research, 2014Co-Authors: Xinxin Ju, Shubiao Wu, Yansheng Zhang, Renjie DongAbstract:Abstract A novel electrolysis-integrated tidal flow constructed wetland (CW) system was developed in this study. The dynamics of intensified nitrogen and phosphorus removal and that of hydrogen sulphide control were evaluated. Ammonium removal of up to 80% was achieved with an inflow concentration of 60 mg/L in wetland systems with and without electrolysis integration. Effluent nitrate concentration decreased from 2 mg/L to less than 0.5 mg/L with the decrease in current intensity from 1.5 mA/cm 2 to 0.57 mA/cm 2 in the electrolysis-integrated wetland system, thus indicating that the current intensity of electrolysis plays an important role in nitrogen transformations. Phosphorus removal was significantly enhanced, exceeding 95% in the electrolysis-integrated CW system because of the in-situ formation of a ferric Iron Coagulant through the electro-dissolution of a sacrificial Iron anode. Moreover, the electrolyzed wetland system effectively inhibits sulphide accumulation as a result of a sulphide precipitation coupled with ferrous-Iron electro-dissolution and/or an inhibition of bacterial sulphate reduction under increased aerobic conditions.
-
Intensified nitrogen and phosphorus removal in a novel electrolysis-integrated tidal flow constructed wetland system
Water Research, 2014Co-Authors: Xinxin Ju, Shubiao Wu, Yansheng Zhang, Renjie DongAbstract:A novel electrolysis-integrated tidal flow constructed wetland (CW) system was developed in this study. The dynamics of intensified nitrogen and phosphorus removal and that of hydrogen sulphide control were evaluated. Ammonium removal of up to 80% was achieved with an inflow concentration of 60mg/L in wetland systems with and without electrolysis integration. Effluent nitrate concentration decreased from 2mg/L to less than 0.5mg/L with the decrease in current intensity from 1.5mA/cm2 to 0.57mA/cm2 in the electrolysis-integrated wetland system, thus indicating that the current intensity of electrolysis plays an important role in nitrogen transformations. Phosphorus removal was significantly enhanced, exceeding 95% in the electrolysis-integrated CW system because of the in-situ formation of a ferric Iron Coagulant through the electro-dissolution of a sacrificial Iron anode. Moreover, the electrolyzed wetland system effectively inhibits sulphide accumulation as a result of a sulphide precipitation coupled with ferrous-Iron electro-dissolution and/or an inhibition of bacterial sulphate reduction under increased aerobic conditions. © 2014 Elsevier Ltd.
