The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
J L Cortina - One of the best experts on this subject based on the ideXlab platform.
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recovery of ammonia from domestic wastewater effluents as Liquid Fertilizers by integration of natural zeolites and hollow fibre membrane contactors
Science of The Total Environment, 2017Co-Authors: I Sancho, Cesar Valderrama, Edxon Licon, N De Arespacochaga, S Lopezpalau, J L CortinaAbstract:The integration of up-concentration processes to increase the efficiency of primary sedimentation, as a solution to achieve energy neutral wastewater treatment plants, requires further post-treatment due to the missing ammonium removal stage. This study evaluated the use of zeolites as a post-treatment step, an alternative to the biological removal process. A natural granular clinoptilolite zeolite was evaluated as a sorbent media to remove low levels (up to 100 mg-N/L) of ammonium from treated wastewater using batch and fixed bed columns. After being activated to the Na-form (Z-Na), the granular zeolite shown an ammonium exchange capacity of 29 ± 0.8 mg N-NH4+/g in single ammonium solutions and 23 ± 0.8 mg N-NH4+/g in treated wastewater simulating up-concentration effluent at pH = 8. The equilibrium removal data were well described by the Langmuir isotherm. The ammonium adsorption into zeolites is a very fast process when compared with polymeric materials (zeolite particle diffusion coefficient around 3 × 10− 12 m2/s). Column experiments with solutions containing 100 mg N-NH4+/L provide effective sorption and elution rates with concentration factors between 20 and 30 in consecutive operation cycles. The loaded zeolite was regenerated using 2 g NaOH/L solution and the rich ammonium/ammonia concentrates 2–3 g/L in NaOH were used in a Liquid-Liquid membrane contactor system in a closed-loop configuration with nitric and phosphoric acid as stripping solutions. The ammonia recovery ratio exceeded 98%. Ammonia nitrate and di-ammonium phosphate concentrated solutions reached up to 2–5% wt. of N.
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valorization of ammonia concentrates from treated urban wastewater using Liquid Liquid membrane contactors
Chemical Engineering Journal, 2016Co-Authors: E Licon E Bernal, C Maya, Cesar Valderrama, J L CortinaAbstract:The removal of ammonium from tertiary effluents by zeolites generates basic ammonia concentrates (up to 1–3 gNH3/L in 1–2 g NaOH/L). This study evaluates the use of hollow fibre Liquid–Liquid membrane contactors (HFMCs) as a concentration and purification step for ammonia effluents to produce NH4NO3 and (NH4)2(HPO4) solutions for potential use as Liquid Fertilizers. The influence of various operational parameters (i.e., flow rate, initial ammonia concentration and stripping acid concentration) was investigated using a closed-loop setup. Due to the high basicity of the ammonia feed streams (pH > 12), the mass transport process was primarily controlled by the free acid concentration in the stripping phase (e.g., HNO3 and H3PO4). A mass transport algorithm to predict the pH of the stripping stream was developed to describe the contactor performance, predict the requirements of the free acid concentration in the stripping phase and optimize the ammonia recovery. Therefore, the closed-loop configuration allowed for ammonia recovery ratios higher than 98% when the required free acid concentration of the stripping phase was maintained. The exhausted NH3/NaOH streams after NH3 removal can be re-used for regeneration of the ammonium-exhausted zeolite filters.
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Valorization of ammonia concentrates from treated urban wastewater using Liquid–Liquid membrane contactors
Chemical Engineering Journal, 2016Co-Authors: E. E. Licon Bernal, C Maya, Cesar Valderrama, J L CortinaAbstract:The removal of ammonium from tertiary effluents by zeolites generates basic ammonia concentrates (up to 1–3 gNH3/L in 1–2 g NaOH/L). This study evaluates the use of hollow fibre Liquid–Liquid membrane contactors (HFMCs) as a concentration and purification step for ammonia effluents to produce NH4NO3 and (NH4)2(HPO4) solutions for potential use as Liquid Fertilizers. The influence of various operational parameters (i.e., flow rate, initial ammonia concentration and stripping acid concentration) was investigated using a closed-loop setup. Due to the high basicity of the ammonia feed streams (pH > 12), the mass transport process was primarily controlled by the free acid concentration in the stripping phase (e.g., HNO3 and H3PO4). A mass transport algorithm to predict the pH of the stripping stream was developed to describe the contactor performance, predict the requirements of the free acid concentration in the stripping phase and optimize the ammonia recovery. Therefore, the closed-loop configuration allowed for ammonia recovery ratios higher than 98% when the required free acid concentration of the stripping phase was maintained. The exhausted NH3/NaOH streams after NH3 removal can be re-used for regeneration of the ammonium-exhausted zeolite filters.
Cesar Valderrama - One of the best experts on this subject based on the ideXlab platform.
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recovery of ammonia from domestic wastewater effluents as Liquid Fertilizers by integration of natural zeolites and hollow fibre membrane contactors
Science of The Total Environment, 2017Co-Authors: I Sancho, Cesar Valderrama, Edxon Licon, N De Arespacochaga, S Lopezpalau, J L CortinaAbstract:The integration of up-concentration processes to increase the efficiency of primary sedimentation, as a solution to achieve energy neutral wastewater treatment plants, requires further post-treatment due to the missing ammonium removal stage. This study evaluated the use of zeolites as a post-treatment step, an alternative to the biological removal process. A natural granular clinoptilolite zeolite was evaluated as a sorbent media to remove low levels (up to 100 mg-N/L) of ammonium from treated wastewater using batch and fixed bed columns. After being activated to the Na-form (Z-Na), the granular zeolite shown an ammonium exchange capacity of 29 ± 0.8 mg N-NH4+/g in single ammonium solutions and 23 ± 0.8 mg N-NH4+/g in treated wastewater simulating up-concentration effluent at pH = 8. The equilibrium removal data were well described by the Langmuir isotherm. The ammonium adsorption into zeolites is a very fast process when compared with polymeric materials (zeolite particle diffusion coefficient around 3 × 10− 12 m2/s). Column experiments with solutions containing 100 mg N-NH4+/L provide effective sorption and elution rates with concentration factors between 20 and 30 in consecutive operation cycles. The loaded zeolite was regenerated using 2 g NaOH/L solution and the rich ammonium/ammonia concentrates 2–3 g/L in NaOH were used in a Liquid-Liquid membrane contactor system in a closed-loop configuration with nitric and phosphoric acid as stripping solutions. The ammonia recovery ratio exceeded 98%. Ammonia nitrate and di-ammonium phosphate concentrated solutions reached up to 2–5% wt. of N.
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valorization of ammonia concentrates from treated urban wastewater using Liquid Liquid membrane contactors
Chemical Engineering Journal, 2016Co-Authors: E Licon E Bernal, C Maya, Cesar Valderrama, J L CortinaAbstract:The removal of ammonium from tertiary effluents by zeolites generates basic ammonia concentrates (up to 1–3 gNH3/L in 1–2 g NaOH/L). This study evaluates the use of hollow fibre Liquid–Liquid membrane contactors (HFMCs) as a concentration and purification step for ammonia effluents to produce NH4NO3 and (NH4)2(HPO4) solutions for potential use as Liquid Fertilizers. The influence of various operational parameters (i.e., flow rate, initial ammonia concentration and stripping acid concentration) was investigated using a closed-loop setup. Due to the high basicity of the ammonia feed streams (pH > 12), the mass transport process was primarily controlled by the free acid concentration in the stripping phase (e.g., HNO3 and H3PO4). A mass transport algorithm to predict the pH of the stripping stream was developed to describe the contactor performance, predict the requirements of the free acid concentration in the stripping phase and optimize the ammonia recovery. Therefore, the closed-loop configuration allowed for ammonia recovery ratios higher than 98% when the required free acid concentration of the stripping phase was maintained. The exhausted NH3/NaOH streams after NH3 removal can be re-used for regeneration of the ammonium-exhausted zeolite filters.
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Valorization of ammonia concentrates from treated urban wastewater using Liquid–Liquid membrane contactors
Chemical Engineering Journal, 2016Co-Authors: E. E. Licon Bernal, C Maya, Cesar Valderrama, J L CortinaAbstract:The removal of ammonium from tertiary effluents by zeolites generates basic ammonia concentrates (up to 1–3 gNH3/L in 1–2 g NaOH/L). This study evaluates the use of hollow fibre Liquid–Liquid membrane contactors (HFMCs) as a concentration and purification step for ammonia effluents to produce NH4NO3 and (NH4)2(HPO4) solutions for potential use as Liquid Fertilizers. The influence of various operational parameters (i.e., flow rate, initial ammonia concentration and stripping acid concentration) was investigated using a closed-loop setup. Due to the high basicity of the ammonia feed streams (pH > 12), the mass transport process was primarily controlled by the free acid concentration in the stripping phase (e.g., HNO3 and H3PO4). A mass transport algorithm to predict the pH of the stripping stream was developed to describe the contactor performance, predict the requirements of the free acid concentration in the stripping phase and optimize the ammonia recovery. Therefore, the closed-loop configuration allowed for ammonia recovery ratios higher than 98% when the required free acid concentration of the stripping phase was maintained. The exhausted NH3/NaOH streams after NH3 removal can be re-used for regeneration of the ammonium-exhausted zeolite filters.
C Maya - One of the best experts on this subject based on the ideXlab platform.
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valorization of ammonia concentrates from treated urban wastewater using Liquid Liquid membrane contactors
Chemical Engineering Journal, 2016Co-Authors: E Licon E Bernal, C Maya, Cesar Valderrama, J L CortinaAbstract:The removal of ammonium from tertiary effluents by zeolites generates basic ammonia concentrates (up to 1–3 gNH3/L in 1–2 g NaOH/L). This study evaluates the use of hollow fibre Liquid–Liquid membrane contactors (HFMCs) as a concentration and purification step for ammonia effluents to produce NH4NO3 and (NH4)2(HPO4) solutions for potential use as Liquid Fertilizers. The influence of various operational parameters (i.e., flow rate, initial ammonia concentration and stripping acid concentration) was investigated using a closed-loop setup. Due to the high basicity of the ammonia feed streams (pH > 12), the mass transport process was primarily controlled by the free acid concentration in the stripping phase (e.g., HNO3 and H3PO4). A mass transport algorithm to predict the pH of the stripping stream was developed to describe the contactor performance, predict the requirements of the free acid concentration in the stripping phase and optimize the ammonia recovery. Therefore, the closed-loop configuration allowed for ammonia recovery ratios higher than 98% when the required free acid concentration of the stripping phase was maintained. The exhausted NH3/NaOH streams after NH3 removal can be re-used for regeneration of the ammonium-exhausted zeolite filters.
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Valorization of ammonia concentrates from treated urban wastewater using Liquid–Liquid membrane contactors
Chemical Engineering Journal, 2016Co-Authors: E. E. Licon Bernal, C Maya, Cesar Valderrama, J L CortinaAbstract:The removal of ammonium from tertiary effluents by zeolites generates basic ammonia concentrates (up to 1–3 gNH3/L in 1–2 g NaOH/L). This study evaluates the use of hollow fibre Liquid–Liquid membrane contactors (HFMCs) as a concentration and purification step for ammonia effluents to produce NH4NO3 and (NH4)2(HPO4) solutions for potential use as Liquid Fertilizers. The influence of various operational parameters (i.e., flow rate, initial ammonia concentration and stripping acid concentration) was investigated using a closed-loop setup. Due to the high basicity of the ammonia feed streams (pH > 12), the mass transport process was primarily controlled by the free acid concentration in the stripping phase (e.g., HNO3 and H3PO4). A mass transport algorithm to predict the pH of the stripping stream was developed to describe the contactor performance, predict the requirements of the free acid concentration in the stripping phase and optimize the ammonia recovery. Therefore, the closed-loop configuration allowed for ammonia recovery ratios higher than 98% when the required free acid concentration of the stripping phase was maintained. The exhausted NH3/NaOH streams after NH3 removal can be re-used for regeneration of the ammonium-exhausted zeolite filters.
Alfredas Martynas Sviklas - One of the best experts on this subject based on the ideXlab platform.
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adjustable n p2o5 ratio urea phosphate Fertilizers for sustainable phosphorus and nitrogen use Liquid phase equilibria via solubility measurements and raman spectroscopy
ACS Sustainable Chemistry & Engineering, 2017Co-Authors: Criztel Navizaga, Alfredas Martynas Sviklas, Jennifer Boecker, Jolanta Galeckiene, Jonas BaltrusaitisAbstract:Design and use of the adjustable N:P2O5 ratio Fertilizers is crucial in proper nutrient management if sustainable phosphorus use is to be ensured. Overfertilization with phosphorus can lead to its fixation in soil, as well as the unwanted environmental phenomena, such as eutrophication. Urea phosphate, CO(NH2)2·H3PO4, based Liquid Fertilizers were synthesized in this work, and their resulting physicochemical properties were determined. For this purpose, phase composition information on the CO(NH2)2·H3PO4–CO(NH2)2–H2O ternary system was analyzed, and critical points on the polytherm were determined. Liquid fertilizer compositions were determined and their corresponding physicochemical properties established. Raman spectroscopy showed that CO(NH2)2·H3PO4 partially retains its strong bonding interactions between both molecular adducts in aqueous solutions suggesting their improved nitrogen management efficiency in soils. Effect of these acidic pH fertilizer solutions on the pH of soil was determined and was ...
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from insoluble minerals to Liquid Fertilizers magnesite as a source of magnesium mg nutrient
ACS Sustainable Chemistry & Engineering, 2016Co-Authors: Jonas Baltrusaitis, Alfredas Martynas SviklasAbstract:The increase in human population necessitates a tremendous growth in crop production while utilizing sustainable sources of plant nutrients. Magnesium is an important plant nutrient with high crustal abundance, but the majority (98%) is incorporated into the crystal lattice of very low solubility minerals, and thus directly unavailable to plants. Here, we present a procedure based on Mg(NO3)2–Ca(NO3)2–NH4NO3–H2O quaternary phase diagram measurements that can be used to determine the solubility and corresponding crystallization temperature (Tcryst) of magnesium containing minerals when dissolved in HNO3. We use a known chemical composition, magnesite, as an example and utilize laboratory experiments with model nitrate solutions. Accordingly, chemical composition and nutrient (N, MgO, CaO) content can be obtained for aqueous solutions with Tcryst of 0 °C for use as Liquid Fertilizers for any low solubility magnesium-containing minerals (e.g., magnesite, dolomite, talc and serpentinite), abundant in Earth’s ...
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Reaction of Urea with Citric Acid
Russian Journal of Applied Chemistry, 2005Co-Authors: R. Paleckiene, Alfredas Martynas Sviklas, R. SlinksieneAbstract:Reaction of urea with citric acid in aqueous solutions at molar ratios of 1 : 1, 1 : 2, and 2 : 1 and the solubility of urea citrate were studied. The data obtained can serve to optimize use of citric acid as a physiologically active substance or nitrification inhibitor and in production of Liquid Fertilizers containing urea.
Jonas Baltrusaitis - One of the best experts on this subject based on the ideXlab platform.
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adjustable n p2o5 ratio urea phosphate Fertilizers for sustainable phosphorus and nitrogen use Liquid phase equilibria via solubility measurements and raman spectroscopy
ACS Sustainable Chemistry & Engineering, 2017Co-Authors: Criztel Navizaga, Alfredas Martynas Sviklas, Jennifer Boecker, Jolanta Galeckiene, Jonas BaltrusaitisAbstract:Design and use of the adjustable N:P2O5 ratio Fertilizers is crucial in proper nutrient management if sustainable phosphorus use is to be ensured. Overfertilization with phosphorus can lead to its fixation in soil, as well as the unwanted environmental phenomena, such as eutrophication. Urea phosphate, CO(NH2)2·H3PO4, based Liquid Fertilizers were synthesized in this work, and their resulting physicochemical properties were determined. For this purpose, phase composition information on the CO(NH2)2·H3PO4–CO(NH2)2–H2O ternary system was analyzed, and critical points on the polytherm were determined. Liquid fertilizer compositions were determined and their corresponding physicochemical properties established. Raman spectroscopy showed that CO(NH2)2·H3PO4 partially retains its strong bonding interactions between both molecular adducts in aqueous solutions suggesting their improved nitrogen management efficiency in soils. Effect of these acidic pH fertilizer solutions on the pH of soil was determined and was ...
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from insoluble minerals to Liquid Fertilizers magnesite as a source of magnesium mg nutrient
ACS Sustainable Chemistry & Engineering, 2016Co-Authors: Jonas Baltrusaitis, Alfredas Martynas SviklasAbstract:The increase in human population necessitates a tremendous growth in crop production while utilizing sustainable sources of plant nutrients. Magnesium is an important plant nutrient with high crustal abundance, but the majority (98%) is incorporated into the crystal lattice of very low solubility minerals, and thus directly unavailable to plants. Here, we present a procedure based on Mg(NO3)2–Ca(NO3)2–NH4NO3–H2O quaternary phase diagram measurements that can be used to determine the solubility and corresponding crystallization temperature (Tcryst) of magnesium containing minerals when dissolved in HNO3. We use a known chemical composition, magnesite, as an example and utilize laboratory experiments with model nitrate solutions. Accordingly, chemical composition and nutrient (N, MgO, CaO) content can be obtained for aqueous solutions with Tcryst of 0 °C for use as Liquid Fertilizers for any low solubility magnesium-containing minerals (e.g., magnesite, dolomite, talc and serpentinite), abundant in Earth’s ...