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A Anees - One of the best experts on this subject based on the ideXlab platform.
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evaluation of the effect of temperature naoh concentration and time on Solubilization of palm oil mill effluent pome using response surface methodology rsm
Bioresource Technology, 2010Co-Authors: K W Chou, I Norli, A AneesAbstract:In this study, palm oil mill effluent (POME) was solubilized by batch thermo-alkaline pre-treatments. A three-factor central composite design (CCD) was applied to identify the optimum COD Solubilization condition. The individual and interactive effects of three factors, temperature, NaOH concentration and reaction time, on Solubilization of POME were evaluated by employing response surface methodology (RSM). The experimental results showed that temperature, NaOH concentration and reaction time all had an individual significant effect on the Solubilization of POME. But these three factors were independent, or there was insignificant interaction on the response. The maximum COD Solubilization of 82.63% was estimated under the optimum condition at 32.5 °C, 8.83 g/L of NaOH and 41.23 h reaction time. The confirmation experiment of the predicted optimum conditions verified that the RSM with the central composite design was useful for optimizing the Solubilization of POME.
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evaluation of the effect of temperature naoh concentration and time on Solubilization of palm oil mill effluent pome using response surface methodology rsm
Bioresource Technology, 2010Co-Authors: K W Chou, I Norli, A AneesAbstract:In this study, palm oil mill effluent (POME) was solubilized by batch thermo-alkaline pre-treatments. A three-factor central composite design (CCD) was applied to identify the optimum COD Solubilization condition. The individual and interactive effects of three factors, temperature, NaOH concentration and reaction time, on Solubilization of POME were evaluated by employing response surface methodology (RSM). The experimental results showed that temperature, NaOH concentration and reaction time all had an individual significant effect on the Solubilization of POME. But these three factors were independent, or there was insignificant interaction on the response. The maximum COD Solubilization of 82.63% was estimated under the optimum condition at 32.5 degrees C, 8.83g/L of NaOH and 41.23h reaction time. The confirmation experiment of the predicted optimum conditions verified that the RSM with the central composite design was useful for optimizing the Solubilization of POME.
K W Chou - One of the best experts on this subject based on the ideXlab platform.
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evaluation of the effect of temperature naoh concentration and time on Solubilization of palm oil mill effluent pome using response surface methodology rsm
Bioresource Technology, 2010Co-Authors: K W Chou, I Norli, A AneesAbstract:In this study, palm oil mill effluent (POME) was solubilized by batch thermo-alkaline pre-treatments. A three-factor central composite design (CCD) was applied to identify the optimum COD Solubilization condition. The individual and interactive effects of three factors, temperature, NaOH concentration and reaction time, on Solubilization of POME were evaluated by employing response surface methodology (RSM). The experimental results showed that temperature, NaOH concentration and reaction time all had an individual significant effect on the Solubilization of POME. But these three factors were independent, or there was insignificant interaction on the response. The maximum COD Solubilization of 82.63% was estimated under the optimum condition at 32.5 °C, 8.83 g/L of NaOH and 41.23 h reaction time. The confirmation experiment of the predicted optimum conditions verified that the RSM with the central composite design was useful for optimizing the Solubilization of POME.
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evaluation of the effect of temperature naoh concentration and time on Solubilization of palm oil mill effluent pome using response surface methodology rsm
Bioresource Technology, 2010Co-Authors: K W Chou, I Norli, A AneesAbstract:In this study, palm oil mill effluent (POME) was solubilized by batch thermo-alkaline pre-treatments. A three-factor central composite design (CCD) was applied to identify the optimum COD Solubilization condition. The individual and interactive effects of three factors, temperature, NaOH concentration and reaction time, on Solubilization of POME were evaluated by employing response surface methodology (RSM). The experimental results showed that temperature, NaOH concentration and reaction time all had an individual significant effect on the Solubilization of POME. But these three factors were independent, or there was insignificant interaction on the response. The maximum COD Solubilization of 82.63% was estimated under the optimum condition at 32.5 degrees C, 8.83g/L of NaOH and 41.23h reaction time. The confirmation experiment of the predicted optimum conditions verified that the RSM with the central composite design was useful for optimizing the Solubilization of POME.
I Norli - One of the best experts on this subject based on the ideXlab platform.
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evaluation of the effect of temperature naoh concentration and time on Solubilization of palm oil mill effluent pome using response surface methodology rsm
Bioresource Technology, 2010Co-Authors: K W Chou, I Norli, A AneesAbstract:In this study, palm oil mill effluent (POME) was solubilized by batch thermo-alkaline pre-treatments. A three-factor central composite design (CCD) was applied to identify the optimum COD Solubilization condition. The individual and interactive effects of three factors, temperature, NaOH concentration and reaction time, on Solubilization of POME were evaluated by employing response surface methodology (RSM). The experimental results showed that temperature, NaOH concentration and reaction time all had an individual significant effect on the Solubilization of POME. But these three factors were independent, or there was insignificant interaction on the response. The maximum COD Solubilization of 82.63% was estimated under the optimum condition at 32.5 °C, 8.83 g/L of NaOH and 41.23 h reaction time. The confirmation experiment of the predicted optimum conditions verified that the RSM with the central composite design was useful for optimizing the Solubilization of POME.
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evaluation of the effect of temperature naoh concentration and time on Solubilization of palm oil mill effluent pome using response surface methodology rsm
Bioresource Technology, 2010Co-Authors: K W Chou, I Norli, A AneesAbstract:In this study, palm oil mill effluent (POME) was solubilized by batch thermo-alkaline pre-treatments. A three-factor central composite design (CCD) was applied to identify the optimum COD Solubilization condition. The individual and interactive effects of three factors, temperature, NaOH concentration and reaction time, on Solubilization of POME were evaluated by employing response surface methodology (RSM). The experimental results showed that temperature, NaOH concentration and reaction time all had an individual significant effect on the Solubilization of POME. But these three factors were independent, or there was insignificant interaction on the response. The maximum COD Solubilization of 82.63% was estimated under the optimum condition at 32.5 degrees C, 8.83g/L of NaOH and 41.23h reaction time. The confirmation experiment of the predicted optimum conditions verified that the RSM with the central composite design was useful for optimizing the Solubilization of POME.
Mauricio Dutra Costa - One of the best experts on this subject based on the ideXlab platform.
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biochar enhances aspergillus niger rock phosphate Solubilization by increasing organic acid production and alleviating fluoride toxicity
Applied and Environmental Microbiology, 2014Co-Authors: Gilberto De Oliveira Mendes, Nikolay Vassilev, Ivo Ribeiro Da Silva, Jose Ivo Ribeiro, Mauricio Dutra Costa, David Lopez ZafraAbstract:During fungal rock phosphate (RP) Solubilization, a significant quantity of fluoride (F(-)) is released together with phosphorus (P), strongly inhibiting the process. In the present study, the effect of two F(-) adsorbents [activated alumina (Al2O3) and biochar] on RP Solubilization by Aspergillus niger was examined. Al2O3 adsorbed part of the F(-) released but also adsorbed soluble P, which makes it inappropriate for microbial RP Solubilization systems. In contrast, biochar adsorbed only F(-) while enhancing phosphate Solubilization 3-fold, leading to the accumulation of up to 160 mg of P per liter. By comparing the values of F(-) measured in solution at the end of incubation and those from a predictive model, it was estimated that up to 19 mg of F(-) per liter can be removed from solution by biochar when added at 3 g liter(-1) to the culture medium. Thus, biochar acted as an F(-) sink during RP Solubilization and led to an F(-) concentration in solution that was less inhibitory to the process. In the presence of biochar, A. niger produced larger amounts of citric, gluconic, and oxalic acids, whether RP was present or not. Our results show that biochar enhances RP Solubilization through two interrelated processes: partial removal of the released F(-) and increased organic acid production. Given the importance of organic acids for P Solubilization and that most of the RPs contain high concentrations of F(-), the proposed Solubilization system offers an important technological improvement for the microbial production of soluble P fertilizers from RP.
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inhibition of aspergillus niger phosphate Solubilization by fluoride released from rock phosphate
Applied and Environmental Microbiology, 2013Co-Authors: Gilberto De Oliveira Mendes, Nikolay Vassilev, Victor Hugo Araujo Bonduki, Ivo Ribeiro Da Silva, Jose Ivo Ribeiro, Mauricio Dutra CostaAbstract:The simultaneous release of various chemical elements with inhibitory potential for phosphate Solubilization from rock phosphate (RP) was studied in this work. Al, B, Ba, Ca, F, Fe, Mn, Mo, Na, Ni, Pb, Rb, Si, Sr, V, Zn, and Zr were released concomitantly with P during the Solubilization of Araxa RP (Brazil), but only F showed inhibitory effects on the process at the concentrations detected in the growth medium. Besides P Solubilization, fluoride decreased fungal growth, citric acid production, and medium acidification by Aspergillus niger. At the maximum concentration found during Araxa RP Solubilization (22.9 mg F− per liter), fluoride decreased P Solubilization by 55%. These findings show that fluoride negatively affects RP Solubilization by A. niger through its inhibitory action on the fungal metabolism. Given that fluoride is a common component of RPs, the data presented here suggest that most of the microbial RP Solubilization systems studied so far were probably operated under suboptimal conditions.
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fungal rock phosphate Solubilization using sugarcane bagasse
World Journal of Microbiology & Biotechnology, 2013Co-Authors: Gilberto De Oliveira Mendes, Ivo Ribeiro Da Silva, Jose Ivo Ribeiro, Carla Silva Dias, Olinto Liparini Pereira, Mauricio Dutra CostaAbstract:The effects of different doses of rock phosphate (RP), sucrose, and (NH4)2SO4 on the Solubilization of RP from Araxa and Catalao (Brazil) by Aspergillus niger, Penicillium canescens, Eupenicillium ludwigii, and Penicillium islandicum were evaluated in a solid-state fermentation (SSF) system with sugarcane bagasse. The factors evaluated were combined following a 23 + 1 factorial design to determine their optimum concentrations. The fitted response surfaces showed that higher doses of RP promoted higher phosphorus (P) Solubilization. The addition of sucrose did not have effects on P Solubilization in most treatments due to the presence of soluble sugars in the bagasse. Except for A. niger, all the fungi required high (NH4)2SO4 doses to achieve the highest level of P Solubilization. Inversely, addition of (NH4)2SO4 was inhibitory to P Solubilization by A. niger. Among the fungi tested, A. niger stood out, showing the highest Solubilization capacity and for not requiring sucrose or (NH4)2SO4 supplementation. An additional experiment with A. niger showed that the content of soluble P can be increased by adding higher RP doses in the medium. However, P yield decreases with increasing RP doses. In this experiment, the maximal P yield (approximately 60 %) was achieved with the lower RP dose (3 g L−1). Our results show that SSF can be used to obtain a low cost biofertilizer rich in P combining RP, sugarcane bagasse, and A. niger. Moreover, sugarcane bagasse is a suitable substrate for SSF aiming at RP Solubilization, since this residue can supply the C and N necessary for the metabolism of A. niger within a range that favors RP Solubilization.
Nikolay Vassilev - One of the best experts on this subject based on the ideXlab platform.
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Production of a potential liquid plant bio-stimulant by immobilized Piriformospora indica in repeated-batch fermentation process
SpringerOpen, 2017Co-Authors: Nikolay Vassilev, Bettina Eichler-löbermann, Elena Flor-peregrin, Vanessa Martos, Antonia Reyes, Maria VassilevaAbstract:Abstract Piriformospora indica, a mycorrhizal-like fungus able to establish associations with roots of a wide range of plants, supporting plant nutrition and increasing plant resistance and tolerance to stress, was shown to solubilise phosphate applied in the form of animal bone char (HABO) in fermentation systems. The process of P solubilisation was caused most likely by proton extrusion and medium pH lowering. The fungal mycelium was successfully immobilized/retained in a polyurethane foam carrier. Further employment of the immobilized mycelium in repeated-batch fermentation process resulted in at least 5 cycles of P Solubilization. The concentration of soluble P increased during the experiment with 1.0 and 3.0 g HABO l−1 and at the end of the 5th batch cycle reached 40.8 and 120 mg l−1, respectively. The resulting final liquid product, without or with solubilized phosphate, was found to significantly increase plant growth and P plant uptake. It can be used as a biostimulant containing microbial plant growth-promoting substances and soluble P derived from renewable sources (HABO) thus supporting the development of sustainable agro-ecosystems
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biochar enhances aspergillus niger rock phosphate Solubilization by increasing organic acid production and alleviating fluoride toxicity
Applied and Environmental Microbiology, 2014Co-Authors: Gilberto De Oliveira Mendes, Nikolay Vassilev, Ivo Ribeiro Da Silva, Jose Ivo Ribeiro, Mauricio Dutra Costa, David Lopez ZafraAbstract:During fungal rock phosphate (RP) Solubilization, a significant quantity of fluoride (F(-)) is released together with phosphorus (P), strongly inhibiting the process. In the present study, the effect of two F(-) adsorbents [activated alumina (Al2O3) and biochar] on RP Solubilization by Aspergillus niger was examined. Al2O3 adsorbed part of the F(-) released but also adsorbed soluble P, which makes it inappropriate for microbial RP Solubilization systems. In contrast, biochar adsorbed only F(-) while enhancing phosphate Solubilization 3-fold, leading to the accumulation of up to 160 mg of P per liter. By comparing the values of F(-) measured in solution at the end of incubation and those from a predictive model, it was estimated that up to 19 mg of F(-) per liter can be removed from solution by biochar when added at 3 g liter(-1) to the culture medium. Thus, biochar acted as an F(-) sink during RP Solubilization and led to an F(-) concentration in solution that was less inhibitory to the process. In the presence of biochar, A. niger produced larger amounts of citric, gluconic, and oxalic acids, whether RP was present or not. Our results show that biochar enhances RP Solubilization through two interrelated processes: partial removal of the released F(-) and increased organic acid production. Given the importance of organic acids for P Solubilization and that most of the RPs contain high concentrations of F(-), the proposed Solubilization system offers an important technological improvement for the microbial production of soluble P fertilizers from RP.
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inhibition of aspergillus niger phosphate Solubilization by fluoride released from rock phosphate
Applied and Environmental Microbiology, 2013Co-Authors: Gilberto De Oliveira Mendes, Nikolay Vassilev, Victor Hugo Araujo Bonduki, Ivo Ribeiro Da Silva, Jose Ivo Ribeiro, Mauricio Dutra CostaAbstract:The simultaneous release of various chemical elements with inhibitory potential for phosphate Solubilization from rock phosphate (RP) was studied in this work. Al, B, Ba, Ca, F, Fe, Mn, Mo, Na, Ni, Pb, Rb, Si, Sr, V, Zn, and Zr were released concomitantly with P during the Solubilization of Araxa RP (Brazil), but only F showed inhibitory effects on the process at the concentrations detected in the growth medium. Besides P Solubilization, fluoride decreased fungal growth, citric acid production, and medium acidification by Aspergillus niger. At the maximum concentration found during Araxa RP Solubilization (22.9 mg F− per liter), fluoride decreased P Solubilization by 55%. These findings show that fluoride negatively affects RP Solubilization by A. niger through its inhibitory action on the fungal metabolism. Given that fluoride is a common component of RPs, the data presented here suggest that most of the microbial RP Solubilization systems studied so far were probably operated under suboptimal conditions.
