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The objective of this study was to verify the feasibility of using biochar, functionalized with layered double hydroxides, as a fertilizer after its use in phosphate treatment (P-BC-LDHs). It was conducted with several levels of P-BC-LDHs using seed germination and early growth assays of lettuce (Lactuca sativa L.). The application of P-BC-LDHs resulted in successful seedling emergence, with an excellent germination capacity of over 96% for all treatments. However, compared to the controls, P-BC-LDHs did not provide favorable seedling traits. In contrast, in the latter experiments, lettuce cultivated under mixtures with P-BC-LDHs, particularly at an application rate of 2.5% (w/w), displayed superior growth quality to those under non-treated conditions. The length of lettuce shoots and roots from this optimal dosage were increased by at least 24% compared to untreated samples. A 17% reduction in biomass yield was observed for the samples from non-supplemented substrates. The nutrient release profiles showed that P-BC-LDHs were capable of slowly supplying phosphorus, thereby increasing the long-term nutrient availability for plants. The findings reported here provide important insights into these materials and confirm that P-BC-LDHs can be used for agricultural purposes after phosphate remediation applications. The results of this study provide constructive information to facilitate the implementation of biochar-based LDH composites for sustainable phosphate removal and recovery.
Jittrera Buates; Tsuyoshi Imai. Application of Biochar Functionalized with Layered Double Hydroxides: Improved Plant Growth Performance after Use as Phosphate Adsorbent. Applied Sciences 2021, 11, 6489 .
AMA StyleJittrera Buates, Tsuyoshi Imai. Application of Biochar Functionalized with Layered Double Hydroxides: Improved Plant Growth Performance after Use as Phosphate Adsorbent. Applied Sciences. 2021; 11 (14):6489.
Chicago/Turabian StyleJittrera Buates; Tsuyoshi Imai. 2021. "Application of Biochar Functionalized with Layered Double Hydroxides: Improved Plant Growth Performance after Use as Phosphate Adsorbent." Applied Sciences 11, no. 14: 6489.
Extreme halophiles offer the advantage to save on the costs of sterilization and water for biohydrogen production from lignocellulosic waste after the pretreatment process with their ability to withstand extreme salt concentrations. This study identifies the dominant hydrogen-producing genera and species among the acclimatized, extremely halotolerant microbial communities taken from two salt-damaged soil locations in Khon Kaen and one location from the salt evaporation pond in Samut Sakhon, Thailand. The microbial communities’ V3–V4 regions of 16srRNA were analyzed using high-throughput amplicon sequencing. A total of 345 operational taxonomic units were obtained and the high-throughput sequencing confirmed that Firmicutes was the dominant phyla of the three communities. Halanaerobium fermentans and Halanaerobacter lacunarum were the dominant hydrogen-producing species of the communities. Spatial proximity was not found to be a determining factor for similarities between these extremely halophilic microbial communities. Through the study of the microbial communities, strategies can be developed to increase biohydrogen molar yield.
Dyah Taroepratjeka; Tsuyoshi Imai; Prapaipid Chairattanamanokorn; Alissara Reungsang. Extremely Halophilic Biohydrogen Producing Microbial Communities from High-Salinity Soil and Salt Evaporation Pond. Fuels 2021, 2, 241 -252.
AMA StyleDyah Taroepratjeka, Tsuyoshi Imai, Prapaipid Chairattanamanokorn, Alissara Reungsang. Extremely Halophilic Biohydrogen Producing Microbial Communities from High-Salinity Soil and Salt Evaporation Pond. Fuels. 2021; 2 (2):241-252.
Chicago/Turabian StyleDyah Taroepratjeka; Tsuyoshi Imai; Prapaipid Chairattanamanokorn; Alissara Reungsang. 2021. "Extremely Halophilic Biohydrogen Producing Microbial Communities from High-Salinity Soil and Salt Evaporation Pond." Fuels 2, no. 2: 241-252.
Although different treatment techniques have been developed to eliminate phosphorus contamination, including for wastewater treatment, treated water often fails to meet quality regulations. Amorphous-ZrO2/Mg–Fe layered double hydroxide (LDH) composites with different molar ratios (Zr/Fe = 0.5–2) were prepared in two-stage synthesis by the combination of coprecipitation and hydrothermal methods. The requirement of high-temperature calcination in the LDH for phosphate adsorption could be eliminated by the synthesis of the composite. Moreover, the phosphate adsorption ability of the composite was higher than that of the individual LDH and amorphous-ZrO2. The addition of ZrO2 increased the phosphate adsorption ability of composite at low pH. The adsorption capacity was increased by decreasing the pH and increasing the temperature (from 290 to 324 K). The bicarbonate (HCO3−) was the most competitive anion for phosphate adsorption. The pseudo-second-order model provided the best description of the kinetic adsorption data. Furthermore, the adsorbed phosphate was easily desorbed by 1 N of NaOH solution. The results suggest that the amorphous-ZrO2/Mg–Fe LDH composite is a promising material for phosphate removal and recovery from wastewater. Ongoing research will investigate the performance of the composite for real wastewater as well as the mechanism of phosphate adsorption on the composite surface.
Atin Nuryadin; Tsuyoshi Imai; Ariyo Kanno; Koichi Yamamoto; Masahiko Sekine; Takaya Higuchi. Phosphate adsorption and desorption on two-stage synthesized amorphous-ZrO2/Mg–Fe layered double hydroxide composite. Materials Chemistry and Physics 2021, 266, 124559 .
AMA StyleAtin Nuryadin, Tsuyoshi Imai, Ariyo Kanno, Koichi Yamamoto, Masahiko Sekine, Takaya Higuchi. Phosphate adsorption and desorption on two-stage synthesized amorphous-ZrO2/Mg–Fe layered double hydroxide composite. Materials Chemistry and Physics. 2021; 266 ():124559.
Chicago/Turabian StyleAtin Nuryadin; Tsuyoshi Imai; Ariyo Kanno; Koichi Yamamoto; Masahiko Sekine; Takaya Higuchi. 2021. "Phosphate adsorption and desorption on two-stage synthesized amorphous-ZrO2/Mg–Fe layered double hydroxide composite." Materials Chemistry and Physics 266, no. : 124559.
Seed germination and early growth assays of lettuce (Lactuca sativa L.) were used as means in the evaluation of different dosage performances of P-loaded layered double hydroxides (P-LDHs). Of these two experiments, results from the former showed that P-LDH application at lower concentrations (0.5 and 1.0 g) influenced the slightly delayed germination, which decreased by no more than approximately 12% compared to that of untreated seeds, whereas the total germination failure was observed once seeds were established with higher ones (2.5 and 5.0 g) because of Al toxicity. Statistical analysis also revealed that a significant dose-dependent inhibition of seed germination was attained after P-LDH administration of at least 1.0 g. On the contrary, beneficial effects were obtained in the successive experiments, where P-LDHs at 0.5, 1.0, 2.5, and 5.0% (w/w) were applied to the growing media. P-LDHs applied at 1.0% outperformed other treatments as well as the control in stimulating plant improvement. The length of lettuce shoots and roots was improved by at least 6.75% compared to those of the non-treated samples and by 10.80% to 30.83% compared with other application rates. The greatest biomass accumulation (1.723 g) was also found in lettuce supplemented with 1.0% of P-LDHs, whereas those without P-LDHs reached their lowest fresh weight (1.422 g). In this experiment, an inadequate supply of Mg could be detrimental to plants from the last two treatment groups. In addition, findings of nutrient leaching verified that P stored in these products was released slowly, and thus they were able to deliver this essential nutrient to plants gradually over a longer period. In summary, this study pointed out that post-adsorption LDHs did not have the ability to boost seed germination, regardless, they could be reused as an agricultural fertilizer to encourage crop quality cultivated under substrate or soil conditions, where an application rate of 1.0% (w/w) was recommended in order to avoid the exposure of excess nutrient levels to the targeted plants.
Jittrera Buates; Tsuyoshi Imai. Assessment of plant growth performance and nutrient release for application of phosphorus-loaded layered double hydroxides as fertilizer. Environmental Technology & Innovation 2021, 22, 101505 .
AMA StyleJittrera Buates, Tsuyoshi Imai. Assessment of plant growth performance and nutrient release for application of phosphorus-loaded layered double hydroxides as fertilizer. Environmental Technology & Innovation. 2021; 22 ():101505.
Chicago/Turabian StyleJittrera Buates; Tsuyoshi Imai. 2021. "Assessment of plant growth performance and nutrient release for application of phosphorus-loaded layered double hydroxides as fertilizer." Environmental Technology & Innovation 22, no. : 101505.
Extremely halotolerant hydrogen-producing bacteria were investigated, owing to their ability to live in high salinity conditions. Based on this characteristic, it was hypothesized that extremely halophilic hydrogen-producing bacteria can tolerate high concentrations of Na+ ions. To test this hypothesis, we investigated the characteristics of extremely halotolerant hydrogen-producing bacteria obtained from salt-damaged soil in Khon Kaen and a commercial salt pan field near Bangkok (Samut Sakhon), Thailand. Results of this preliminary investigation showed that hydrogen production under saturated conditions of 26% (6 M) NaCl was possible after 1 year of acclimatization. The extremely halotolerant hydrogen-producing bacteria in this research were also confirmed to have a requirement for Cl− ions for hydrogen production. Therefore, these extremely halotolerant hydrogen-producing bacteria are suitable for hydrogen production from lignocellulosic biomass.
Dyah Asri Handayani Taroepratjeka; Tsuyoshi Imai; Prapaipid Chairattanamanokorn; Alissara Reungsang; Yung-Tse Hung. Biohydrogen Production from Lignocellulosic Biomass by Extremely Halotolerant Bacterial Communities from a Salt Pan and Salt-Damaged Soil. Biosolids Treatment Processes 2021, 411 -427.
AMA StyleDyah Asri Handayani Taroepratjeka, Tsuyoshi Imai, Prapaipid Chairattanamanokorn, Alissara Reungsang, Yung-Tse Hung. Biohydrogen Production from Lignocellulosic Biomass by Extremely Halotolerant Bacterial Communities from a Salt Pan and Salt-Damaged Soil. Biosolids Treatment Processes. 2021; ():411-427.
Chicago/Turabian StyleDyah Asri Handayani Taroepratjeka; Tsuyoshi Imai; Prapaipid Chairattanamanokorn; Alissara Reungsang; Yung-Tse Hung. 2021. "Biohydrogen Production from Lignocellulosic Biomass by Extremely Halotolerant Bacterial Communities from a Salt Pan and Salt-Damaged Soil." Biosolids Treatment Processes , no. : 411-427.
The objective of this study is to reduce the production of Hydrogen sulfide (H2S) in sewer pipe by using conductive concrete and electricity-producing bacteria (EPB). This work was mainly focused on evaluating the effect of inoculation of EPB isolated from sewage sludge from municipal wastewater treatment plant for decreasing production of H2S. The experimental results showed that inoculation of EPB could decrease the concentration of H2S, indicating that produced H2S in an anaerobic sludge sediment layer (bottom of sewer pipe) was biologically oxidized by EPB. These results demonstrated that conductive concrete can provide an electron pathway from anaerobic sludge sediment in the bottom of sewer pipe to oxygen dissolved in surface water, and as a result the electron generated from hydrogen H2S oxidation in anaerobic environment was accepted by oxygen via conductive concrete.
M Fukushima; K Promunuan; S O-Thong; T Suzuki; T Imai. Hydrogen sulfide reduction by conductive concrete with MFCs strain. IOP Conference Series: Materials Science and Engineering 2020, 965, 012003 .
AMA StyleM Fukushima, K Promunuan, S O-Thong, T Suzuki, T Imai. Hydrogen sulfide reduction by conductive concrete with MFCs strain. IOP Conference Series: Materials Science and Engineering. 2020; 965 (1):012003.
Chicago/Turabian StyleM Fukushima; K Promunuan; S O-Thong; T Suzuki; T Imai. 2020. "Hydrogen sulfide reduction by conductive concrete with MFCs strain." IOP Conference Series: Materials Science and Engineering 965, no. 1: 012003.
In this study, rice straw-derived biochar was used as a raw material for the synthesis of biochar functionalized with layered double hydroxides (BC-LDHs) as efficacious phosphate adsorbents. Many types of BC-LDH composites were successfully fabricated by either the precipitation of layered double hydroxides on pristine biochar or the pyrolysis of feedstock loaded with LDHs; successful synthesis of composites was corroborated via characterization analyses. Experimental investigations including those for pH effects, coexisting anion effects, reaction times, and initial concentrations of phosphate were performed with two samples, namely, BC-LDHs 6 and pure LDHs. An optimum pH of 3.0 was observed for both samples. The kinetic performance of BC-LDHs 6 (24 h) was slower than that of pure LDHs (3 h); however, a maximum adsorption capacity of the composite of up to 192 mg/g was achieved, which exceeded that of pure LDHs by nearly 1.2 times. This was considered to be related to the superior properties of the composite acquired when biochar and LDHs were combined. In both cases, the kinetics of phosphate adsorption followed the pseudo-second-order model, whereas the adsorption isotherms were consistent with the Freundlich model. The composite also exhibited specific selectivity toward phosphate in the presence of highly competing anions and pH changes. The results obtained demonstrate that amalgamation of both starting materials shows promise for the development of innovative adsorbents for phosphate removal.
Jittrera Buates; Tsuyoshi Imai. Biochar functionalization with layered double hydroxides composites: Preparation, characterization, and application for effective phosphate removal. Journal of Water Process Engineering 2020, 37, 101508 .
AMA StyleJittrera Buates, Tsuyoshi Imai. Biochar functionalization with layered double hydroxides composites: Preparation, characterization, and application for effective phosphate removal. Journal of Water Process Engineering. 2020; 37 ():101508.
Chicago/Turabian StyleJittrera Buates; Tsuyoshi Imai. 2020. "Biochar functionalization with layered double hydroxides composites: Preparation, characterization, and application for effective phosphate removal." Journal of Water Process Engineering 37, no. : 101508.
In this current study, an apparatus called air-water interface generator was investigated for oxygen transfer enhancement by increasing a contact area between air and water. The effect of this apparatus and its optimal installation condition were investigated. The total volumetric oxygen transfer coefficient (kLaT) in this study was divided into volumetric oxygen transfer for the bubble transfer (kLaB), volumetric oxygen transfer for the inner interface transfer inside the apparatus (kLaI), and volumetric oxygen transfer for the free water surface transfer (kLaS). The experimental results show that the apparatus installed near the water surface could increase the oxygen transfer 18% due to the presence of an inner interface. Additionally, the effect of the number and the position of apparatus on bubble dispersion should also be taken into consideration since the bubble transfer makes the most significant contribution to total oxygen transfer in the diffused aeration system.
Passaworn Warunyuwong; Tsuyoshi Imai. Improvement of oxygen transfer by increasing contact area between gas and liquid using air–water interface generator. Environmental Technology 2019, 42, 1758 -1765.
AMA StylePassaworn Warunyuwong, Tsuyoshi Imai. Improvement of oxygen transfer by increasing contact area between gas and liquid using air–water interface generator. Environmental Technology. 2019; 42 (11):1758-1765.
Chicago/Turabian StylePassaworn Warunyuwong; Tsuyoshi Imai. 2019. "Improvement of oxygen transfer by increasing contact area between gas and liquid using air–water interface generator." Environmental Technology 42, no. 11: 1758-1765.
Dyah Asri Handayani Taroepratjeka; Tsuyoshi Imai; Prapaipid Chairattanamanokorn; Alissara Reungsang. Investigation of hydrogen-producing ability of extremely halotolerant bacteria from a salt pan and salt-damaged soil in Thailand. International Journal of Hydrogen Energy 2019, 44, 3407 -3413.
AMA StyleDyah Asri Handayani Taroepratjeka, Tsuyoshi Imai, Prapaipid Chairattanamanokorn, Alissara Reungsang. Investigation of hydrogen-producing ability of extremely halotolerant bacteria from a salt pan and salt-damaged soil in Thailand. International Journal of Hydrogen Energy. 2019; 44 (6):3407-3413.
Chicago/Turabian StyleDyah Asri Handayani Taroepratjeka; Tsuyoshi Imai; Prapaipid Chairattanamanokorn; Alissara Reungsang. 2019. "Investigation of hydrogen-producing ability of extremely halotolerant bacteria from a salt pan and salt-damaged soil in Thailand." International Journal of Hydrogen Energy 44, no. 6: 3407-3413.
Novi Arfarita; Indonesia Universitas Islam Malang (Unisma); Anton Muhibuddin; Tsuyoshi Imai. Exploration of indigenous free nitrogen-fixing bacteria from rhizosphere of Vigna radiata for agricultural land treatment. Journal of Degraded and Mining Lands Management 2019, 6, 1617 -1623.
AMA StyleNovi Arfarita, Indonesia Universitas Islam Malang (Unisma), Anton Muhibuddin, Tsuyoshi Imai. Exploration of indigenous free nitrogen-fixing bacteria from rhizosphere of Vigna radiata for agricultural land treatment. Journal of Degraded and Mining Lands Management. 2019; 6 (2):1617-1623.
Chicago/Turabian StyleNovi Arfarita; Indonesia Universitas Islam Malang (Unisma); Anton Muhibuddin; Tsuyoshi Imai. 2019. "Exploration of indigenous free nitrogen-fixing bacteria from rhizosphere of Vigna radiata for agricultural land treatment." Journal of Degraded and Mining Lands Management 6, no. 2: 1617-1623.
Residual Chlorella sp. biomass obtained after anaerobic solid-state fermentation was used to produce bio-hythane. The residual biomass was pretreated using acid, thermal, and acid-thermal methods before their respective hydrolysates were used in dark fermentation followed by the methanogenesis of anaerobic digestion to produce hydrogen and methane, respectively. Pretreatment of the residual biomass using acid and thermal methods did not significantly increase reducing sugar production. However, a maximum reducing sugar content of 28.9 mg-reducing-sugar·g-biomass−1 was attained using an acid-thermal method, resulting in the highest hydrogen and methane yields of 12.5 and 81 mL·g-volatile-solid−1, respectively. This was equivalent to the total energy yield of 3.03 kJ·g-VS−1 or 4.6% energy recovery, based on the heating value of the residual biomass.
Siriporn Lunprom; Orawan Phanduang; Apilak Salakkam; Qiang Liao; Tsuyoshi Imai; Alissara Reungsang. Bio-hythane production from residual biomass of Chlorella sp. biomass through a two-stage anaerobic digestion. International Journal of Hydrogen Energy 2018, 44, 3339 -3346.
AMA StyleSiriporn Lunprom, Orawan Phanduang, Apilak Salakkam, Qiang Liao, Tsuyoshi Imai, Alissara Reungsang. Bio-hythane production from residual biomass of Chlorella sp. biomass through a two-stage anaerobic digestion. International Journal of Hydrogen Energy. 2018; 44 (6):3339-3346.
Chicago/Turabian StyleSiriporn Lunprom; Orawan Phanduang; Apilak Salakkam; Qiang Liao; Tsuyoshi Imai; Alissara Reungsang. 2018. "Bio-hythane production from residual biomass of Chlorella sp. biomass through a two-stage anaerobic digestion." International Journal of Hydrogen Energy 44, no. 6: 3339-3346.
This research uses tap water to absorb carbon dioxide from mixed gas (N2 and CO2) in an absorption apparatus coupled with a water-film-forming-unit (WFFU). The objective is to assess the benefits of using a WFFU to enhance CO2 removal efficiency at low pressure conditions. Based on our results, the WFFU significantly improves CO2 capture at 0.30 MPa in a water absorption system with two WFFUs. The CO2 removal efficiency was 20% greater than for systems without WFFUs. Moreover, statistical data attained by the Taguchi analysis method showed that the number of WFFUs used in the absorption system has the greatest influence on CO2 removal efficiency (contribution percentage = 50.65%) compared to gas pressure, initial CO2 concentration, gas-to-liquid ratio, and liquid temperature. We also thoroughly investigated the effects of these factors on CO2 removal performance. The optimum conditions for CO2 removal efficiency in a system equipped with two WFFUs are low temperature, low gas-to-liquid ratio, low gas pressure (0.25–0.30 MPa), and high inlet CO2 concentration. These findings could provide an effective method for capturing CO2 from exhaust gases, and thus help mitigate global warming.
Diem-Mai Kim Nguyen; Tsuyoshi Imai; Shahira Said Aly; Takaya Higuchi; Ariyo Kanno; Koichi Yamamoto; Masahiko Sekine. Influence of water-film-forming-unit on the enhanced removal of carbon dioxide from mixed gas using water absorption apparatus. Environmental Technology 2018, 41, 852 -862.
AMA StyleDiem-Mai Kim Nguyen, Tsuyoshi Imai, Shahira Said Aly, Takaya Higuchi, Ariyo Kanno, Koichi Yamamoto, Masahiko Sekine. Influence of water-film-forming-unit on the enhanced removal of carbon dioxide from mixed gas using water absorption apparatus. Environmental Technology. 2018; 41 (7):852-862.
Chicago/Turabian StyleDiem-Mai Kim Nguyen; Tsuyoshi Imai; Shahira Said Aly; Takaya Higuchi; Ariyo Kanno; Koichi Yamamoto; Masahiko Sekine. 2018. "Influence of water-film-forming-unit on the enhanced removal of carbon dioxide from mixed gas using water absorption apparatus." Environmental Technology 41, no. 7: 852-862.
The recent development of Structure‐from‐Motion (SfM) and Multi‐View Stereo (MVS) photogrammetry techniques has enabled semi‐automatic high‐resolution bathymetry using aerial images taken by consumer‐grade digital cameras mounted on unmanned aerial vehicles (UAVs). However, the applicability of these techniques is sometimes limited by sun and sky reflections at the water surface, which render the point‐cloud density and accuracy insufficient. In this research, we present a new imaging technique to suppress the effect of these water‐surface reflections. In this technique, we order a drone to take a short video instead of a still picture at each waypoint. We then apply a temporal minimum filter to the video. This filter extracts the smallest RGB values in all the video frames for each pixel, and composes an image with greatly reduced reflection effects. To assess the performance of this technique, we applied it at three small shallow‐water sites. Specifically, we evaluated the effect of the technique on the point cloud density and the accuracy and precision of the photogrammetry. The results showed that the proposed technique achieved a far denser point cloud than the case in which a randomly chosen frame was used for each waypoint, and also showed better overall accuracy and precision in estimating water‐bottom elevation. The effectiveness of this new technique should depend on the surface wave state and sky radiance distribution, and this dependence, as well as the applicability to large areas, should be investigated in future research.
I.G.D. Yudha Partama; Ariyo Kanno; Motoyasu Ueda; Yoshihisa Akamatsu; Ryutei Inui; Masahiko Sekine; Koichi Yamamoto; Tsuyoshi Imai; Takaya Higuchi. Removal of water-surface reflection effects with a temporal minimum filter for UAV-based shallow-water photogrammetry. Earth Surface Processes and Landforms 2018, 43, 2673 -2682.
AMA StyleI.G.D. Yudha Partama, Ariyo Kanno, Motoyasu Ueda, Yoshihisa Akamatsu, Ryutei Inui, Masahiko Sekine, Koichi Yamamoto, Tsuyoshi Imai, Takaya Higuchi. Removal of water-surface reflection effects with a temporal minimum filter for UAV-based shallow-water photogrammetry. Earth Surface Processes and Landforms. 2018; 43 (12):2673-2682.
Chicago/Turabian StyleI.G.D. Yudha Partama; Ariyo Kanno; Motoyasu Ueda; Yoshihisa Akamatsu; Ryutei Inui; Masahiko Sekine; Koichi Yamamoto; Tsuyoshi Imai; Takaya Higuchi. 2018. "Removal of water-surface reflection effects with a temporal minimum filter for UAV-based shallow-water photogrammetry." Earth Surface Processes and Landforms 43, no. 12: 2673-2682.
Kiattisak Panpong; Tussanee Srimachai; Kamchai Nuithitikul; Prawit Kongjan; Sompong O-Thong; Tsuyoshi Imai; Natapon Kaewthong. Anaerobic co-digestion between canned sardine wastewater and glycerol waste for biogas production: Effect of different operating processes. Energy Procedia 2017, 138, 260 -266.
AMA StyleKiattisak Panpong, Tussanee Srimachai, Kamchai Nuithitikul, Prawit Kongjan, Sompong O-Thong, Tsuyoshi Imai, Natapon Kaewthong. Anaerobic co-digestion between canned sardine wastewater and glycerol waste for biogas production: Effect of different operating processes. Energy Procedia. 2017; 138 ():260-266.
Chicago/Turabian StyleKiattisak Panpong; Tussanee Srimachai; Kamchai Nuithitikul; Prawit Kongjan; Sompong O-Thong; Tsuyoshi Imai; Natapon Kaewthong. 2017. "Anaerobic co-digestion between canned sardine wastewater and glycerol waste for biogas production: Effect of different operating processes." Energy Procedia 138, no. : 260-266.
Advanced water disinfection technologies that do not produce harmful by-products would be highly desirable. This study presents results for the use of pressurized carbon dioxide (CO) and a liquid-film-forming apparatus for disinfection of seawater. The sensitivity of to the pressurized CO was examined for various conditions of pressure, temperature, working volume ratios (WVRs), flow rates, and pressure cycling. Morphology of was observed by using scanning electron microscopy (SEM). A strong correlation between the inactivation efficiency and pressure cycling was detected ( < 0.001). The frequency and magnitude of pressure cycling were the key factors responsible for high rates of inactivation during the pressurized CO treatment. The results from linear regression analyses suggest that the model can explain about 91% of the inactivation efficiency ( < 0.001). The pressurized CO treatment (at 0.7 MPa, 20°C, 50% WVR) in the process involving pressure cycling (∆P = 0.12 MPa, 15 cycles) resulted in complete inactivation (5.2 log reduction) of within 3 min. These findings suggest that pressurized CO could be a potentially useful disinfection method for water treatment.
Tsuyoshi Imai; Thanh-Loc Thi Dang. Escherichia coli Inactivation Using Pressurized Carbon Dioxide as an Innovative Method for Water Disinfection. Escherichia coli - Recent Advances on Physiology, Pathogenesis and Biotechnological Applications 2017, 1 .
AMA StyleTsuyoshi Imai, Thanh-Loc Thi Dang. Escherichia coli Inactivation Using Pressurized Carbon Dioxide as an Innovative Method for Water Disinfection. Escherichia coli - Recent Advances on Physiology, Pathogenesis and Biotechnological Applications. 2017; ():1.
Chicago/Turabian StyleTsuyoshi Imai; Thanh-Loc Thi Dang. 2017. "Escherichia coli Inactivation Using Pressurized Carbon Dioxide as an Innovative Method for Water Disinfection." Escherichia coli - Recent Advances on Physiology, Pathogenesis and Biotechnological Applications , no. : 1.
With tap water as a physical solvent to absorb CO2 from different concentrations of mixed gases (containing CO2 and N2), an apparatus outfitted with a water-film generator was used to enhance the CO2 dissolution rate as well as the contact between the liquid and gas phases. The operational pressure in the absorption tank, induced gas pressure, initial CO2 content, liquid-to-gas ratio, and temperature had a significant effect on the CO2 removal efficiency and its absorption rate in water. On varying the experimental conditions, the CO2 removal ability and absorption rate varied from 22.9 to 90.0% and 4.5 × 10−4–44.4 × 10−4 mol s−1 L−1, respectively. For instance, the removal and absorption rates reached approximately 90.0% and 12.0 × 10−4 mol s−1 L−1, respectively, when the experiment was operated at 10 °C and 0.30 MPa of gas pressure with 35% CO2 inlet gas content and 1.40 liquid-to-gas ratio. Additionally, a statistical tool, the Taguchi method, was applied to evaluate the effects of four parameters thoroughly and systematically. According to the Taguchi analysis results of nine total runs for four independent variables with three levels for each, the two most significant variables for the removal rate were temperature and liquid-to-gas ratio, whereas those for the absorption rate were inlet gas CO2 concentration and gas compressed pressure. These results may provide evidence to aid in the adoption of this method for large-scale CO2 capture from exhaust gases.
Mai Kim Diem Nguyen; Tsuyoshi Imai; Wataru Yoshida; Loc Thi Thanh Dang; Takaya Higuchi; Ariyo Kanno; Koichi Yamamoto; Masahiko Sekine. Performance of a Carbon Dioxide Removal Process Using a Water Scrubber with the Aid of a Water-Film-Forming Apparatus. Waste and Biomass Valorization 2017, 9, 1827 -1839.
AMA StyleMai Kim Diem Nguyen, Tsuyoshi Imai, Wataru Yoshida, Loc Thi Thanh Dang, Takaya Higuchi, Ariyo Kanno, Koichi Yamamoto, Masahiko Sekine. Performance of a Carbon Dioxide Removal Process Using a Water Scrubber with the Aid of a Water-Film-Forming Apparatus. Waste and Biomass Valorization. 2017; 9 (10):1827-1839.
Chicago/Turabian StyleMai Kim Diem Nguyen; Tsuyoshi Imai; Wataru Yoshida; Loc Thi Thanh Dang; Takaya Higuchi; Ariyo Kanno; Koichi Yamamoto; Masahiko Sekine. 2017. "Performance of a Carbon Dioxide Removal Process Using a Water Scrubber with the Aid of a Water-Film-Forming Apparatus." Waste and Biomass Valorization 9, no. 10: 1827-1839.
Riyanto Haribowo; Minami Yoshimura; Masahiko Sekine; Tsuyoshi Imai; Koichi Yamamoto; Takaya Higuchi; Ariyo Kanno. Behavior of toxicity in river basins dominated by residential areas. Contemporary Engineering Sciences 2017, 10, 305 -315.
AMA StyleRiyanto Haribowo, Minami Yoshimura, Masahiko Sekine, Tsuyoshi Imai, Koichi Yamamoto, Takaya Higuchi, Ariyo Kanno. Behavior of toxicity in river basins dominated by residential areas. Contemporary Engineering Sciences. 2017; 10 ():305-315.
Chicago/Turabian StyleRiyanto Haribowo; Minami Yoshimura; Masahiko Sekine; Tsuyoshi Imai; Koichi Yamamoto; Takaya Higuchi; Ariyo Kanno. 2017. "Behavior of toxicity in river basins dominated by residential areas." Contemporary Engineering Sciences 10, no. : 305-315.
Co-disposal of household hazardous materials with municipal solid wastes (MSW) into the open dumping sites is the usual practice in Bangladesh. In this paper, characterization of heavy metals in MSW in open dumping sites at Matuail, Dhaka and Khulna is presented. MSW samples were collected and analyzed for total metals content (Cd, Co, Cr, Cu, Mn, Ni, Pb and Zn) and metal fractions. The analysis results showed that total metals content in MSW at Matuail dumping site is higher than Khulna dumping site and the metals are predominantly associated with fine soil fraction. Both sites contain higher bio-available fraction of metals. The TCLP analysis result showed that the dumping sites are non-hazardous in nature in context of heavy metals pollution. Runoff leachate also contains insignificant concentration of metals. Under the present condition prevailing at both dumping sites, the dissolution of acid soluble metals and the associate risk is very low.
Tsuyoshi Imai; Masahiko Sekine; Megumi Kuraoka; Takaya Higuchi; Rezaul Karim. Assessment of heavy metal contamination from municipal solid waste open dumping sites in Bangladesh. International Journal of Environment and Waste Management 2017, 19, 191 .
AMA StyleTsuyoshi Imai, Masahiko Sekine, Megumi Kuraoka, Takaya Higuchi, Rezaul Karim. Assessment of heavy metal contamination from municipal solid waste open dumping sites in Bangladesh. International Journal of Environment and Waste Management. 2017; 19 (3):191.
Chicago/Turabian StyleTsuyoshi Imai; Masahiko Sekine; Megumi Kuraoka; Takaya Higuchi; Rezaul Karim. 2017. "Assessment of heavy metal contamination from municipal solid waste open dumping sites in Bangladesh." International Journal of Environment and Waste Management 19, no. 3: 191.
Ashraf Elsheikh; Masahiko Sekine; Sérgio Freitas; Yuko Horikiri; Ariyo Kanno; Takaya Higuchi; Tsuyoshi Imai; Koichi Yamamoto. COMPARISON OF SURFACE WATER TOXICITY AND CHEMICALS FROM RESIDENTIAL AREAS IN TIMOR-LESTE AND JAPAN USING LARVAL HIMEDAKA (Oryzias Latipes var.) ACUTE TOXICITY ASSAY. Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 2017, 73, III_525 -III_533.
AMA StyleAshraf Elsheikh, Masahiko Sekine, Sérgio Freitas, Yuko Horikiri, Ariyo Kanno, Takaya Higuchi, Tsuyoshi Imai, Koichi Yamamoto. COMPARISON OF SURFACE WATER TOXICITY AND CHEMICALS FROM RESIDENTIAL AREAS IN TIMOR-LESTE AND JAPAN USING LARVAL HIMEDAKA (Oryzias Latipes var.) ACUTE TOXICITY ASSAY. Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research). 2017; 73 (7):III_525-III_533.
Chicago/Turabian StyleAshraf Elsheikh; Masahiko Sekine; Sérgio Freitas; Yuko Horikiri; Ariyo Kanno; Takaya Higuchi; Tsuyoshi Imai; Koichi Yamamoto. 2017. "COMPARISON OF SURFACE WATER TOXICITY AND CHEMICALS FROM RESIDENTIAL AREAS IN TIMOR-LESTE AND JAPAN USING LARVAL HIMEDAKA (Oryzias Latipes var.) ACUTE TOXICITY ASSAY." Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 73, no. 7: III_525-III_533.
Co-disposal of household hazardous materials with municipal solid wastes (MSW) into the open dumping sites is the usual practice in Bangladesh. In this paper, characterization of heavy metals in MSW in open dumping sites at Matuail, Dhaka and Khulna is presented. MSW samples were collected and analyzed for total metals content (Cd, Co, Cr, Cu, Mn, Ni, Pb and Zn) and metal fractions. The analysis results showed that total metals content in MSW at Matuail dumping site is higher than Khulna dumping site and the metals are predominantly associated with fine soil fraction. Both sites contain higher bio-available fraction of metals. The TCLP analysis result showed that the dumping sites are non-hazardous in nature in context of heavy metals pollution. Runoff leachate also contains insignificant concentration of metals. Under the present condition prevailing at both dumping sites, the dissolution of acid soluble metals and the associate risk is very low.
Rezaul Karim; Megumi Kuraoka; Takaya Higuchi; Masahiko Sekine; Tsuyoshi Imai. Assessment of heavy metal contamination from municipal solid waste open dumping sites in Bangladesh. International Journal of Environment and Waste Management 2017, 19, 191 .
AMA StyleRezaul Karim, Megumi Kuraoka, Takaya Higuchi, Masahiko Sekine, Tsuyoshi Imai. Assessment of heavy metal contamination from municipal solid waste open dumping sites in Bangladesh. International Journal of Environment and Waste Management. 2017; 19 (3):191.
Chicago/Turabian StyleRezaul Karim; Megumi Kuraoka; Takaya Higuchi; Masahiko Sekine; Tsuyoshi Imai. 2017. "Assessment of heavy metal contamination from municipal solid waste open dumping sites in Bangladesh." International Journal of Environment and Waste Management 19, no. 3: 191.