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Cheng, Dongle,Ngo, Huu Hao,Guo, Wenshan,Liu, Yiwen,Chang, Soon Woong,Nguyen, Dinh Duc,Nghiem, Long Duc,Zhou, Junliang,Ni, Bingjie Elsevier 2018 Bioresource technology Vol.267 No.-
<P><B>Abstract</B></P> <P>Antibiotic wastewater has become a major concern due to the toxicity and recalcitrance of antibiotics. Anaerobic membrane bioreactors (AnMBRs) are considered alternative technology for treating antibiotic wastewater because of their advantages over the conventional anaerobic processes and aerobic MBRs. However, membrane fouling remains the most challenging issue in the AnMBRs’ operation and this limits their application. This review critically discusses: (i) antibiotics removal and antibiotic resistance genes (ARGs) in different types of AnMBRs and the impact of antibiotics on membrane fouling and (ii) the integrated AnMBRs systems for fouling control and removal of antibiotics. The presence of antibiotics in AnMBRs could aggravate membrane fouling by influencing fouling-related factors (i.e., sludge particle size, extracellular polymeric substances (EPS), soluble microbial products (SMP), and fouling-related microbial communities). Conclusively, integrated AnMBR systems can be a practical technology for antibiotic wastewater treatment.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Removal of antibiotics and their effects on membrane fouling in AnMBRs are reviewed. </LI> <LI> AnMBRs are efficient for treating antibiotic wastewater mainly by biodegradation. </LI> <LI> The presence of antibiotics in AnMBRs will aggravate membrane fouling. </LI> <LI> Integrating AnMBRs with biofilm carriers and BES is efficient in fouling control. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
A critical review on ammonium recovery from wastewater for sustainable wastewater management
Ye, Yuanyao,Ngo, Huu Hao,Guo, Wenshan,Liu, Yiwen,Chang, Soon Woong,Nguyen, Dinh Duc,Liang, Heng,Wang, Jie Elsevier 2018 Bioresource technology Vol.268 No.-
<P><B>Abstract</B></P> <P>The growing global population’s demand for ammonium has triggered an increase in its supply, given that ammonium plays a crucial role in fertilizer production for the purpose of food security. Currently, ammonia used in fertilizer production is put through what is known as the industrial Haber Bosch process, but this approach is substantially expensive and requires much energy. For this reason, looking for effective methods to recover ammonium is important for environmental sustainability. One of the greatest opportunities for ammonium recovery occurs in wastewater treatment plants due to wastewater containing a large quantity of ammonium ions. The comprehensively and critically review studies on ammonium recovery conducted, have the potential to be applied in current wastewater treatment operations. Technologies and their ammonium recovery mechanisms are included in this review. Furthermore the economic feasibility of such processes is analysed. Possible future directions for ammonium recovery from wastewater are suggested.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Growing global population ultimately calls for ammonium recovery. </LI> <LI> Wastewater is considered as the renewable resource for the ammonium recovery. </LI> <LI> The bioelectrochemical system can efficiently and effectively recover ammonium. </LI> <LI> Mechanism and technology of ammonium recovery were summarized. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Adsorption Characteristics and pH-dependence of Metsulfuron-Methyl onto Activated Carbons
Kim, Seoung-Hyun,Ngo, Huu-Hao M. Dekker 2007 Separation science and technology Vol.42 No.8
<P> The adsorption characteristics of metsulfuron-methyl (MM) onto powdered activated carbon (PAC) and granular activated carbon (GAC) were studied at varying solution pHs (4-9) and temperatures (20-40°C). The dependence of pH was observed in aqueous solution with MM. The film mass transfer and intraparticle diffusion coefficients were estimated from concentration decay curves obtained in the batch adsorber. The maximum adsorption capacity decreased with increasing pH and temperature. Among the PAC used, the coconut based PAC had the best adsorption capacity. The adsorption isotherms could be plotted using the Freundlich and Toth models with a reasonable degree of accuracy. The overall adsorption isotherm such as the modified-Toth model should be applied. The performances of the fixed-bed GAC system was also simulated by a model developed. The objective of the present study was to investigate the adsorption and pH dependence behavior of MM onto PAC and GAC in order to diminish the environmental risk of MM pollution.</P>
Selective production of volatile fatty acids at different pH in an anaerobic membrane bioreactor
Khan, Mohd Atiqueuzzaman,Ngo, Huu Hao,Guo, Wenshan,Chang, Soon Woong,Nguyen, Dinh Duc,Varjani, Sunita,Liu, Yi,Deng, Lijuan,Cheng, Chen Elsevier 2019 Bioresource technology Vol.283 No.-
<P><B>Abstract</B></P> <P>This study investigated the production of major volatile fatty acid (VFA) components in an anaerobic membrane bioreactor (AnMBR) to treat low-strength synthetic wastewater. No selective inhibition was applied for methane production and solvent-extraction method was used for VFA extraction. The results showed acetic and propionic acid were the predominant VFA components at pH 7.0 and 6.0 with concentrations of 1.444 ± 0.051 and 0.516 ± 0.032 mili-mol/l respectively. At pH 12.0 isobutyric acid was the major VFA component with a highest concentration of 0.712 ± 0.008 mili-mol/l. The highest VFA yield was 48.74 ± 1.5 mg VFA/100 mg COD<SUB>feed</SUB> at pH 7.0. At different pH, AnMBR performance was evaluated in terms of COD, nutrient removal and membrane fouling rate. It was observed that the membrane fouled at a faster rate in both acidic and alkaline pH conditions, the slowest rate in membrane fouling was observed at pH 7.0.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Concentrations of VFA components were observed at different pH in AnMBR. </LI> <LI> Acetic acid was predominant VFA component at pH 6.0 and 7.0. </LI> <LI> Highest concentration for isobutyric acid was observed at pH 12.0. </LI> <LI> The highest overall VFA yield was 48.74 ± 1.5 mg VFA/100 mg COD<SUB>feed</SUB>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
A continuous photocatalysis system in the degradation of herbicide
비겐스워란,Nathaporn Areerachakul,Huu Hao Ngo,Jaya Kandasamy 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.4
The performance of both batch and continuous photo-catalytic reactors was studied to evaluate their capabilities in removing the sulfonyl urea herbicide of metsulfuron methyl (MM). It was found in a batch reactor that the addition of a small amount of powder activated carbon (PAC) significantly increased the rate of degradation of MM. The continuous photo-catalytic system resulted in 57% of MM removal. When a small dose of activated carbon was added in the photo-catalytic system, MM removal increased to 78-86% MM removal for retention times between of 5.25-21 min (corresponding to withdrawal rates of 10-40 mLmin−1). In this study, the pseudo first order rate constants of a continuous photo-catalytic system revealed that shorter retention times were associated with lower rate constants. Solid phase micro extraction/gas chromatography (SPME/GC) results showed that high concentrations of MM were broken down to small volatile organic compounds (VOCs) by photo-catalytic oxidation. PAC adsorbed the photo-products and increased the degradation of MM.
Mathematical Modeling of Granular Activated Carbon (GAC) Biofiltration System
문희,심왕근,Durgananda Singh Chaudhary,Saravanamuthu Vigneswaran,Huu-Hao Ngo,Jae Wook Lee 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.1
In this study, a mathematical model of a fixed bed Granular Activated Carbon (GAC) biofiltration system was developed to predict the organic removal efficiency of the filter. The model consists of bulk transportation, adsorption, utilization, and biodegradation of organics. The variation of the specific surface area due to biofilm growth and the effect of filter backwash were also included in the model. The intrapellet diffusion and the diffusion of substrate in the biofilm were described by linear driving force approximation (LDFA) method. Biodegradation of organics was described by Monod kinetics. Sips adsorption isotherm was used to analyze the initial adsorption equilibrium of the system. The model showed that the organic removal efficiency of the biofilter greatly depends on the parameters related to the biological activities such as the maximum rate of substrate utilization (kmax) and biomass yield (Y) coefficients. Parameters such as suspended cell concentration (Xs) and decay constant (Kd) had little effects on the model simulation results. The filter backwash also had no significant impact on the performance of the biofilter.
Feasibility study on magnetic enhanced flocculation for mitigating membrane fouling
Jie Wang,Jun Yang,Wenshan Guo,Huu-Hao Ngo 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-
During coagulation/flocculation-membrane filtration (CF-MF) process, membrane fouling was alleviated more significantly through magnetic enhanced flocculation-membrane filtration (MEF-MF) in the presence of ferromagnetic seeds in coagulants. Porous cake layer with flocs of large size was able to alleviate decline rate of membrane flux. Foulant analysis proved that magnetic enhanced flocculation (MEF) pretreatment was more efficient for the reductions of low and mid-molecular weight (MW) organic structures than CF-MF. Biopolymers with high molecular weight were also effectively removed before filtration. Overall, MEF-MF could provide a novel alternative approach to mitigate membrane fouling for surface water treatment.