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Environmental engineering research
Korean Society of Environmental Engineers
Environmental engineering research

Korean Society of Environmental Engineers

双月刊

1226-1025

Environmental engineering research/Journal Environmental engineering researchEISCIISTP
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    Oxalate-enhanced degradation of ranitidine in the TiO 2 /H 2 O 2 system under dark conditions

    Tran, Khen DuyKim, Jungwon
    1-10页
    查看更多>>摘要：The effect of oxalate on the degradation of ranitidine was investigated in the titanium dioxide (TiO2)/hydrogen peroxide (H2O2) system. The degradation of ranitidine proceeded more rapidly, with a 5.7-fold increase in the presence of oxalate. The oxalate-enhanced degradation is attributed to the higher production of hydroperoxyl radicals (HO2 center dot) through the complexation of oxalate on the >Ti-III (>Ti-III(oxalate)(n)((2n-3)-)), generated from inner-sphere electron transfer in the peroxo metal complexes (>Ti-IV-OOH). This was confirmed by measuring the time-dependent concentrations of HO2 center dot, hydroxyl radicals ((OH)-O-center dot), and H2O2 both with and without oxalate. The results of reactive oxygen species (ROS)-quenching experiments show that both HO2 center dot and singlet oxygen (O-1(2)) are primary oxidants in the TiO2/H2O2/oxalate system. The pseudo-first-order degradation rate constants (k) for ranitidine were higher with increasing TiO2 dosage (up to [TiO2] = 1.0 g/L) and H2O2 concentration but were optimal at [oxalate] = 1 mM. Although other chelating agents, such as citrate, acetate, and malonate, also showed a positive effect on the degradation of ranitidine in the TiO2/H2O2 system, oxalate exhibited the best performance. In addition, the extent of positive effect of oxalate in the TiO2/H2O2 system was much higher than that in the tungsten oxide (WO3)/H2O2 system.
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    High capacity rocking-chair capacitive deionization using highly crystalline sodium cobalt hexacyanoferrate (NaCoHCF) electrodes

    Ahn, JaewukJoo, HwajooJeon, Sung-ilYoon, Jeyong...
    11-19页
    查看更多>>摘要：Prussian blue analogue (PBA) electrodes are widely used cation-selective electrodes for electrochemical desalination technologies due to their high specific capacity rates and fast kinetic properties. Despite the fact that previous studies of PBAs for electrochemical desalination have shown remarkable desalination capacity levels, they remain insufficient if used to desalt highly concentrated salt water such as seawater. Here, we applied highly crystalline sodium cobalt hexacyanoferrate (NaCoHCF) electrodes, a type of PBA that can utilize two redox active sites, to a rocking-chair capacitive deionization (RCDI) process. The specific capacity of the NaCoHCF electrode using two redox active sites was 88 mAh g-1 (active material: 110 mAh g-1), confirmed to be 1.5 times higher than that of PBA electrode that use one redox active site. As a result of desalination tests, this system achieved a high desalination capacity of 123 mg g-1 (active material: 154 mg g-1) with 88% ion removal in a 500 mM NaCl solution. The results of this study present a considerable increase in the desalination capacity through the introduction of NaCoHCF electrodes that utilize two redox active sites in the RCDI system.
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    Simulations of low impact development designs using the storm water management model

    Jang, JiyiKim, SoobinCha, Sung MinPyo, Jongcheol...
    21-31页
    查看更多>>摘要：This study assessed the U.S. Environmental Protection Agency's Storm Water Management Model (SWMM) for urban water management challenges. This study conducted a sensitivity analysis to identify the most influential factors in the SWMM. Moreover, the performance of SWMM was evaluated with the HYDRUS-1D module in simulating infiltration rates. The sensitivity results showed field capacity as the most significant factor, highlighting the need for advanced modeling techniques to consider factors like field capacity. The SWMM was evaluated by the HYDRUS-1D that SWMM consistently underestimated peak infiltration rates and commenced infiltration calculations only when soil moisture exceeded field capacity. It reveals its limitations in handling unsaturated soil conditions and highlights the consideration of the matric head of the soil during the infiltration calculation in soil media. Moreover, the evaluation of bioretention areas showed larger areas resulting in more substantial flow reductions but with significant variability under different rainfall conditions. Accordingly, this result emphasizes the importance of careful consideration for environmental factors in bioretention design. This study contributes by enhancing understanding of SWMM's limitations in simulating urban water management challenges. Thus, this research will offer technical assistance to stakeholders focused on challenges such as runoff, hydrologic cycle, and urban flooding in urban areas.
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    Preparation of a novel magnetic composite based on rice straw derived biochar and chromium ferrite for enhanced absorption of organic dye

    Meng, YuanChen, DanLi, YangSheng, Wenyu...
    33-47页
    查看更多>>摘要：The modification of biochar (BC) with metal/metal oxides is expected to improve its adsorption capacity to pollutants, especially anions dyes. A green chromium ferrite-biochar composites (CF-BC) was synthesized to enhance the adsorption efficiency of Congo red (CR) via a simple co-precipitation method. The samples were characterized by different characterization techniques: XRD, FT-IR, SEM, XPS, etc, which showed that chromium ferrite was successfully loaded on the surface of biochar. The influencing factors of adsorption and recycling properties were discussed, and the adsorption mechanisms such as kinetics, isotherm, thermodynamics were explored. The results show that CF-BC2 achieves a removal rate of 92.29% for CR and maintains a removal rate of 90% even after three cycles. The addition of ferrite not only promoted the adsorption effect, but also increased the magnetic property, making the adsorbents easy to recycle. The equilibrium and kinetic studies suggested that the adsorption process followed Freundlich isotherm and pseudo-second order model, respectively. Furthermore, a study into the adsorption mechanism revealed that CF-BC2 primarily achieves CR adsorption through electrostatic attraction, hydrogen bonding, 2c-2c interactions, and pore filling.
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    Effect of solvent and calcination process on physicochemical features of silica nanocapsule for CO2 capture

    Rahim, Abdul Rahman AbdulJohari, KhairiraihannaHussain, Murid
    49-60页
    查看更多>>摘要：Silica nanocapsules (SiNC) have gained considerable interest in their application as adsorbents due to its excellent physical structure and surface chemistry. The SiNC were synthesised via emulsion technique, whereby the effect of different solvents and calcination process were investigated. Diethyl ether as a solvent produced SiNC with the biggest surface area, 644 m2/g, followed by toluene and ethanol, 575 and 533 m2/g, respectively. The calcined SiNC had bigger surface area and pore volume, but smaller pore size as compared to their non-calcined counterparts. Diethyl ether and toluene as solvents produced SiNC with capsules or hollowed-core morphological structure, whereas by using ethanol, the SiNC was of solid core. The spectral analysis showed that the SiNC were of similar characteristics, whereby the ethanol-based SiNC had more intense hydroxyl (-OH) peaks and diethyl ether and toluene had an extra -CH3 peak. The carbon dioxide (CO2) adsorption measurement study showed that toluene-based SiNC performed the highest CO2 adsorption capacity (Q = 2.59 mmol/g), followed by diethyl ether-based (1.45 mmol/g) and ethanol-based, (1.28 mmol/g). The sufficiently competent CO2 adsorption capacity of the SiNC combined with their excellent physicochemical characteristics indicated their promising prospects for application as an adsorbent in CO2 adsorption.
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    Assessing the sorption of uranium and thorium from simulated solutions using chemically treated biomass of Sargassum aquifolium macroalgae

    Albayari, MohammadNordin, NorazziziAdnan, RohanaKhalili, Fawwaz...
    61-73页
    查看更多>>摘要：This study aimed to investigate the potential application of activated Sargassum aquifolium macroalgae (ASAM) as a biosorbent for uranium(VI) and thorium(IV) ions, employing controlled experimental conditions. The parameters examined included pH, biosorbent mass, initial concentration, contact time, and temperature. To enhance sorption characteristics, the raw Sargassum aquifolium macroalgae (SAM) biomass underwent separate pre-treatments using phosphoric acid (H3PO4) and potassium hydroxide (KOH). Various models were employed to analyze the kinetic and sorption isotherm data, and thermodynamic parameters were determined to assess the sorption mechanism. The KOH-treated SAM demonstrated a higher capacity for biosorbing U(VI) and Th(IV) compared to the acid-treated biomass. The sorption mechanism was investigated through characterization techniques such as FTIR, SEM/EDS, XRD, Zeta-potential, and BET analysis. The desorption-sorption cycle efficiency of both sorbents was evaluated, indicating that 0.1 mol L-1 HNO3 exhibited the most efficient desorption reagent for both metal cations over five consecutive cycles. These findings suggest the potential of ASAM as a biosorbent for removing U(VI) and Th(IV) from aqueous solutions. Furthermore, the study demonstrated the remarkable effectiveness of the two activated sorbents in eliminating U(VI) and Th(IV) ions from real wastewater samples.
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    Innovative membrane technology for water treatment solutions: Current status and future prospects of carbon nanotube membranes

    Lee, ByeonghoKim, Choonsoo
    75-87页
    查看更多>>摘要：Carbon nanotube (CNT)-based membranes are gaining attention for their unique properties and applications in membrane technology. This review comprehensively explores major types of CNT-based membranes-buckypaper, CNT mixed, and vertically aligned CNT membranes-along with their fabrication methods, pore size control strategies, unique properties, and potential applications. Understanding these aspects will help fully harness the potential of CNT-based membranes in addressing challenges in water treatment and other fields. CNTs offer promise as water treatment membranes due to their ability to enhance performance of existing membranes, overcome trade-offs, exhibit antibacterial properties, and facilitate fast water transport.
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    Effects of plant species diversity and density of Acorus calamus and Reineckea carnea on nitrogen removal and plant growth in constructed wetlands during the cold season

    Yang, LupingShen, LuqiTao, JingwenXiao, Derong...
    89-98页
    查看更多>>摘要：Plant species diversity is an important factor affecting nitrogen (N) removal in constructed wetlands (CWs), but these effects are poorly understood for the cold season. The potential effect of plant density on ecosystem function is also understudied. This study set up a two-factor experiment to explore the effects of plant species diversity and density on N removal and plant growth in CWs during the cold season. The results showed that: (1) Plant species richness positively affected plant aboveground N pool but had no significant effect on N removal efficiency or plant aboveground biomass. (2) Across plant density treatments, Acorus calamus monocultures had significantly higher plant belowground biomass and N pools than Reineckea carnea monocultures. (3) The increase in plant planting density not only increased plant biomass and plant N pool of R. carnea monoculture, but also improved the removal efficiency of nitrate nitrogen (NO3--N) 3 --N) and total inorganic nitrogen (TIN) in R. carnea monoculture. These results showed that plant species diversity had a limited effect on N removal in CWs during the cold season, but more N could be removed by increasing planting density and harvesting specific plants, such as A. calamus. .
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    Electrooxidation pretreatment prevents membrane fouling and improve treatment efficiency of a membrane bioreactor treating reject water and condensate generated during sludge dewatering

    Sinharoy, ArindamKim, Seung HuiChung, Chong Min
    99-109页
    查看更多>>摘要：This study explored electrooxidation pretreatment of reject water and condensate generated using sludge dewatering with goal of improving its treatment using a membrane bioreactor (MBR) and also prevent membrane fouling. Initially the important parameters for electrooxidation process were optimized. The results showed that a total current of 4.03 A/L, current density of 60 mA/cm2, 2 , pH 7, and 1500 mg/L of Cl-- ion concentration were best in terms of solubilization and removal of fouling-causing substances from wastewater. The colour removal from the wastewater could be as high as 92.4% (7 colour unit (CU) of treated effluent) under optimum operating condition. For biological treatment, a four-tank biological system consisting of consequently placed anoxic and aerobic compartments with final tank containing a MBR was used. When compared with untreated wastewater, the MBR treating EO pretreated wastewater showed significant improvement in terms of membrane fouling measured as transmembrane pressure (TMP). Further improvement in the nitrogen and TOC removal could be achieved by extending the EO treatment duration and subsequent HRT of MBR treatment. The findings from the study clearly demonstrates the potential for integrating a combined electrooxidation and MBR treatment in the conventional wastewater treatment plant for reducing its influent pollutant load.
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    Fluoride removal from wastewater and potential for resource recovery: Comparative studies between different treatment technologies

    Sinharoy, ArindamChung, Chong Min
    111-125页
    查看更多>>摘要：Water sources contaminated with fluoride provide a serious health hazard to people all over the world. The major sources of this fluoride pollution are modern industrial processes such as semiconductor manufacturing, steel making, glass industry, etc. which relied upon fluorine-based chemicals. This review paper highlights the advantages, drawbacks, methods, and efficiency of the several methods used to remove fluoride from water such as coagulation, electrocoagulation, ion exchange resin, adsorption, fluidized bed crystallization, membrane-based procedures (including nanofiltration, reverse osmosis, electrodialysis and pervaporation). Each technique is assessed according to its cost-effectiveness, operational complexity, removal efficiency, and applicability for various scales of water treatment application. Furthermore, included in the study are important aspects affecting the choice of fluoride removal technology, such as sustainability concerns, regulatory compliance, and water quality. In addition, current developments and developing patterns in fluoride elimination technologies are examined to offer perspectives on future avenues for investigation. By combining the body of current knowledge, this study attempts to educate decision-makers, researchers, and practitioners in the area of water treatment on the most recent advancements and best practices for reducing fluoride contamination in water sources.
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