Dr Luong Nguyen was trained at University of Wollongong in Environmental Engineering. His Master and PhD focused on the treatment of trace organic contaminants (i.e. PPCPs, pesticides, industrial chemicals) in biological processes, including activated sludge, membrane bioreactor, enzymatic membrane reactor and fungal bioreactor.
He held a postdoctoral research position at the Advanced Environmental Biotechnology Centre in Nanyang Technological University, Singapore. He investigated the impact of PPCPs on activated sludge microbial community and developed enrichment and isolation methods to retrieve bacterial strains from activated sludge with capability to degrade PPCPs.
Dr. Nguyen’s overall aim is to improve sustainability through research and technology development in the areas of waste and wastewater treatment with a focus on the recovery of water and the production of renewable energy and chemical precursors.
His current research is to disentangle the complexities of microbiomes in anaerobic digestion and co-digestion systems to facilitate genome-driven process design. This effort will enhance our understanding and control of biological wastewater and sludge treatment processes.
Can supervise: YES
- Anaerobic digestion and co-digestion
- Microbial ecology in wastewater treatment process
- Genomic driven process design
- Bioreactor design and operation
- Environmental Biotechnology
- Water and wasteater treatment processes
Vu, HP, Nguyen, LN, Lesage, G & Nghiem, LD 2020, 'Synergistic effect of dual flocculation between inorganic salts and chitosan on harvesting microalgae Chlorella vulgaris', Environmental Technology and Innovation, vol. 17.View/Download from: UTS OPUS or Publisher's site
© 2020 Elsevier B.V. The flocculation efficiency of microalgae Chlorella vulgaris for subsequent harvesting was investigated using single flocculants of inorganic salts, synthetic polymer, chitosan and dual flocculants of inorganic salts and chitosan. Synthetic polymer (FlopamTM) could achieve over 90% optical density removal (OD680removal) at a low flocculant dose (20 to 40 mg polymer per litre of algal suspension) through the bridging mechanism and charge neutralisation. Inorganic salts (i.e. ferric chloride and aluminium sulphate) and chitosan individually resulted in low flocculation efficiency (<90%) despite high dose (i.e. 160 to 200 mg per litre of algal suspension). The dual flocculation combining ferric chloride or aluminium sulphate with chitosan induced synergistic effects, resulting in >80% flocculation efficiency, significantly higher than the sum of each individual flocculation. The improvement in flocculation efficiency was 57 and 24% respectively for ferric chloride/chitosan and aluminium sulphate/chitosan. Charge neutralisation of microalgal cells by ferric chloride or aluminium sulphate combined with bridging by chitosan produced the synergy.
Kim, D, Nguyen, LN & Oh, S 2020, 'Ecological impact of the antibiotic ciprofloxacin on microbial community of aerobic activated sludge.', Environmental geochemistry and health.View/Download from: UTS OPUS or Publisher's site
This study investigated the effects and fate of the antibiotic ciprofloxacin (CIP) at environmentally relevant levels (50-500 µg/L) in activated sludge (AS) microbial communities under aerobic conditions. Exposure to 500 µg/L of CIP decreased species diversity by about 20% and significantly altered the phylogenetic structure of AS communities compared to those of control communities (no CIP exposure), while there were no significant changes upon exposure to 50 µg/L of CIP. Analysis of community composition revealed that exposure to 500 µg/L of CIP significantly reduced the relative abundance of Rhodobacteraceae and Nakamurellaceae by more than tenfold. These species frequently occur in AS communities across many full-scale wastewater treatment plants and are involved in key ecosystem functions (i.e., organic matter and nitrogen removal). Our analyses showed that 50-500 µg/L CIP was poorly removed in AS (about 20% removal), implying that the majority of CIP from AS processes may be released with either their effluents or waste sludge. We therefore strongly recommend further research on CIP residuals and/or post-treatment processes (e.g., anaerobic digestion) for waste streams that may cause ecological risks in receiving water bodies.
Cheng, D, Huu, HN, Guo, W, Chang, SW, Dinh, DN, Liu, Y, Shan, X, Long, DN & Luong, NN 2020, 'Removal process of antibiotics during anaerobic treatment of swine wastewater', BIORESOURCE TECHNOLOGY, vol. 300.View/Download from: Publisher's site
Nguyen, LN, Commault, AS, Kahlke, T, Ralph, PJ, Semblante, GU, Johir, MAH & Nghiem, LD 2020, 'Genome sequencing as a new window into the microbial community of membrane bioreactors - A critical review.', Science of the Total Environment, vol. 704, pp. 135279-135279.View/Download from: UTS OPUS or Publisher's site
Recent developed sequencing techniques have resulted in a new and unprecedented way to study biological wastewater treatment, in which most organisms are uncultivable. This review provides (i) an insight on state-of-the-art sequencing techniques and their limitations; (ii) a critical assessment of the microbial community in biological reactor and biofouling layer in a membrane bioreactor (MBR). The data from high-throughput sequencing has been used to infer microbial growth conditions and metabolisms of microorganisms present in MBRs at the time of sampling. These data shed new insight to two fundamental questions about a microbial community in the MBR process namely the microbial composition (who are they?) and the functions of each specific microbial assemblage (what are their function?). The results to date also highlight the complexity of the microbial community growing on MBRs. Environmental conditions are dynamic and diverse, and can influence the diversity and structural dynamics of any given microbial community for wastewater treatment. The benefits of understanding the structure of microbial communities on three major aspects of the MBR process (i.e. nutrient removal, biofouling control, and micropollutant removal) were symmetrically delineated. This review also indicates that the deployment of microbial community analysis for a practical engineering context, in terms of process design and system optimization, can be further realized.
Nguyen, LN, Truong, MV, Nguyen, AQ, Johir, MAH, Commault, AS, Ralph, PJ, Semblante, GU & Nghiem, LD 2020, 'A sequential membrane bioreactor followed by a membrane microalgal reactor for nutrient removal and algal biomass production', Environmental Science: Water Research and Technology, vol. 6, no. 1, pp. 189-196.View/Download from: UTS OPUS or Publisher's site
© 2019 The Royal Society of Chemistry. A hybrid process combining a single compartment aerobic membrane bioreactor (MBR) and a membrane microalgal reactor (MMR) was evaluated for nutrient removal and microalgal biomass production. When operated without biomass extraction, the microalgal biomass in the MMR reached 920 mg L-1 on day 18 and then collapsed, rendering nutrient removal ineffective. Stable operation of the MMR was achieved by regular biomass extraction (i.e. 1/30 of the microalgal biomass in the reactor daily). The biomass production at steady state was approximately 26 g m-3 d-1. The NO3- and PO43- uptake values by microalgae were 4.0 ± 1.1 and 1.5 ± 0.9 g m-3 d-1, respectively. A facile flocculation and separation technique capable of recovering 98% microalgal biomass was demonstrated. Although the hybrid process can significantly enhance nutrient removal and biomass production, further research is needed to intensify the microalgal growth rate. At the current microalgal growth rate, a large MMR volume (37 times that of the MBR) is necessary for synchronous operation.
Nguyen, LN, Nghiem, LD, Pramanik, BK & Oh, S 2019, 'Cometabolic biotransformation and impacts of the anti-inflammatory drug diclofenac on activated sludge microbial communities', SCIENCE OF THE TOTAL ENVIRONMENT, vol. 657, pp. 739-745.View/Download from: UTS OPUS or Publisher's site
Chapple, A, Nguyen, LN, Hai, FI, Dosseto, A, Rashid, MHO, Oh, S, Price, WE & Nghiem, LD 2019, 'Impact of inorganic salts on degradation of bisphenol A and diclofenac by crude extracellular enzyme from Pleurotus ostreatus', Biocatalysis and Biotransformation, vol. 37, no. 1, pp. 10-17.View/Download from: UTS OPUS or Publisher's site
© 2017 Informa UK Limited, trading as Taylor & Francis Group This study investigated the influence of inorganic salts on enzymatic activity and the removal of trace organic contaminants (TrOCs) by crude laccase from the white-rot fungus Pleurotus ostreatus. A systematic analysis of 15 cations and anions from common inorganic salts was presented. Laccase activity was not inhibited by monovalent cations (i.e. Na + , NH 4 + , K + ), while the presence of divalent and trivalent cations showed variable impact – from negligible to complete inhibition – of both laccase activity and its TrOC removal performance. Of interest was the observation of discrepancy between residual laccase activity and TrOC removal in the presence of some ions. Mg 2+ had negligible impact on residual laccase activity but significant impact on TrOC removal. Conversely, F − showed greater impact on residual laccase activity than on TrOC removal. This observation indicated different impacts of the interfering ions on the interaction between laccase and TrOCs as compared to that between laccase and the reagent used to measure its activity, implicating that residual laccase activity may not always be an accurate indicator of TrOC removal. The degree of impact of halides was in the order of F − > I − > Br − > Cl − . Particularly, the tolerance of the tested laccase to Cl − has important implications for a range of industrial applications.
Nguyen, AQ, Nguyen, LN, Phan, HV, Galway, B, Bustamante, H & Nghiem, LD 2019, 'Effects of operational disturbance and subsequent recovery process on microbial community during a pilot-scale anaerobic co-digestion', INTERNATIONAL BIODETERIORATION & BIODEGRADATION, vol. 138, pp. 70-77.View/Download from: UTS OPUS or Publisher's site
Nguyen, LN, Nghiem, LD, Pramanik, BK & Oh, S 2019, 'Cometabolic biotransformation and impacts of the anti-inflammatory drug diclofenac on activated sludge microbial communities', Science of the Total Environment, vol. 657, pp. 739-745.View/Download from: UTS OPUS or Publisher's site
This study evaluated the removal of diclofenac (DCF) in activated sludge and its long-term exposure effects on the function and structure of the microbial community. Activated sludge could remove <50% of 50 μg/L DCF. The removal decreased significantly to below 15% when DCF concentrations increased to 500 and 5000 μg/L. Quantitative assessment of the fate of DCF showed that its main removal routes were biodegradation (21%) and adsorption (7%), with other abiotic removals being insignificant (<5%). The biodegradation occurred through cometabolic mechanisms. DCF exposure in the range of 50–5000 μg/L did not disrupt the major functions of the activated sludge ecosystem (e.g. biomass yield and heterotrophic activity) over two months of DCF exposure. Consistently, 16S rRNA gene-based community analysis revealed that the overall community diversity (e.g. species richness and diversity) and structure of activated sludge underwent no significant alterations. The analysis did uncover a significant increase in several genera, Nitratireductor, Asticcacaulis, and Pseudacidovorax, which gained competitive advantages under DCF exposure. The enrichment of Nitratireductor, Asticcacaulis, and Pseudacidovorax genus might contribute to DCF biodegradation and emerge as a potential microbial niche for the removal of DCF.
Hoang, NPV, Koottatep, T, Chapagain, SK, Panuvatvanich, A, Polprasert, C, Thi, MHN, Chaiwong, C & Ngoc, LN 2019, 'Removal and monitoring acetaminophen-contaminated hospital wastewater by vertical flow constructed wetland and peroxidase enzymes', JOURNAL OF ENVIRONMENTAL MANAGEMENT, vol. 250.View/Download from: UTS OPUS or Publisher's site
Keerthisinghe, TP, Luong, NN, Kwon, EE & Oh, S 2019, 'Antiseptic chlorhexidine in activated sludge: Biosorption, antimicrobial susceptibility, and alteration of community structure', JOURNAL OF ENVIRONMENTAL MANAGEMENT, vol. 237, pp. 629-635.View/Download from: UTS OPUS or Publisher's site
Nguyen, LN & Oh, S 2019, 'Impacts of antiseptic cetylpyridinium chloride on microbiome and its removal efficiency in aerobic activated sludge', International Biodeterioration & Biodegradation, vol. 137, pp. 23-29.View/Download from: UTS OPUS or Publisher's site
This study evaluated short- and long-term exposure of activated sludge (AS) microbiome to cetylpyridinium chloride (CPC), a quaternary ammonium compound widely used as biocidal additive or cationic surfactant. Toxicity assay in batch mode showed that CPC (50 μg L−1) inhibited cell growth. However, in a continuous reactor, CPC concentration in the range of 50–500 μg L−1 did not result in any observable impact on the biological activities of the AS microbiome. Similarly, 16S rRNA gene-based community profiling revealed that CPC had no observable impact on microbial diversity. At the phylogenetic structure, Rhodobacter (15 ± 7% of the total) and Asticcacaulis (9 ± 3%) were the only two phyla with increasing population in the 500 μg L−1-exposed reactors. This was also supported by an observation of no major change in the community structure. The reactors could remove >60% of CPC at initial concentrations of 50–500 μg L−1, primarily by adsorption and biodegradation. The enrichment of Rhodobacter and Asticcacaulis genus might contribute to CPC biodegradation and emerge as a potential microbial niche for the removal of CPC.
Nguyen, LN, Nguyen, AQ, Johir, MAH, Guo, W, Ngo, HH, Chaves, AV & Nghiem, LD 2019, 'Application of rumen and anaerobic sludge microbes for bio harvesting from lignocellulosic biomass.', Chemosphere, vol. 228, pp. 702-708.View/Download from: UTS OPUS or Publisher's site
This study investigated the production of biogas, volatile fatty acids (VFAs), and other soluble organic from lignocellulosic biomass by two microbial communities (i.e. rumen fluid and anaerobic sludge). Four types of abundant lignocellulosic biomass (i.e. wheat straw, oaten hay, lurence hay and corn silage) found in Australia were used. The results show that rumen microbes produced four-time higher VFAs level than that of anaerobic sludge reactors, indicating the possible application of rumen microorganism for VFAs generation from lignocellulosic biomass. VFA production in the rumen fluid reactors was probably due to the presence of specific hydrolytic and acidogenic bacteria (e.g. Fibrobacter and Prevotella). VFA production corroborated from the observation of pH drop in the rumen fluid reactors indicated hydrolytic and acidogenic inhibition, suggesting the continuous extraction of VFAs from the reactor. Anaerobic sludge reactors on the other hand, produced more biogas than that of rumen fluid reactors. This observation was consistent with the abundance of methanogens in anaerobic sludge inoculum (3.98% of total microbes) compared to rumen fluid (0.11%). VFA production from lignocellulosic biomass is the building block chemical for bioplastic, biohydrogen and biofuel. The results from this study provide important foundation for the development of engineered systems to generate VFAs from lignocellulosic biomass.
Nguyen, LN, Commault, AS, Johir, MAH, Bustamante, H, Aurisch, R, Lowrie, R & Nghiem, LD 2019, 'Application of a novel molecular technique to characterise the effect of settling on microbial community composition of activated sludge.', Journal of environmental management, vol. 251.View/Download from: UTS OPUS or Publisher's site
Activated sludge (AS) and return activated sludge (RAS) microbial communities from three full-scale municipal wastewater treatment plants (denoted plant A, B and C) were compared to assess the impact of sludge settling (i.e. gravity thickening in the clarifier) and profile microorganisms responsible for nutrient removal and reactor foaming. The results show that all three plants were dominated with microbes in the phyla of Proteobacteria, Bacteroidetes, Verrucomicrobia, Actinobacteria, Chloroflexi, Firmicutes, Nitrospirae, Spirochaetae, Acidobacteria and Saccharibacteria. AS and RAS shared above 80% similarity in the microbial community composition, indicating that sludge thickening does not significantly alter the microbial composition. Autotrophic and heterotrophic nitrifiers were present in the AS. However, the abundance of autotrophic nitrifiers was significantly lower than that of the heterotrophic nitrifiers. Thus, ammonium removal at these plants was achieved mostly by heterotrophic nitrification. Microbes that can cause foaming were at 3.2% abundance, and this result is well corroborated with occasional aerobic biological reactor foaming. By contrast, these microbes were not abundant (<2.1%) at plant A and C, where aerobic biological reactor foaming has not been reported.
Nguyen, LN, Johir, MAH, Commault, A, Bustamante, H, Aurisch, R, Lowrie, R & Nghiem, LD 2019, 'Impacts of mixing on foaming, methane production, stratification and microbial community in full-scale anaerobic co-digestion process.', Bioresource technology, vol. 281, pp. 226-233.View/Download from: UTS OPUS or Publisher's site
This study investigated the impact of mixing on key factors including foaming, substrate stratification, methane production and microbial community in three full scale anaerobic digesters. Digester foaming was observed at one plant that co-digested sewage sludge and food waste, and was operated without mixing. The lack of mixing led to uneven distribution of total chemical oxygen demand (tCOD) and volatile solid (VS) as well as methane production within the digester. 16S rRNA gene-based community analysis clearly differentiated the microbial community from the top and bottom. By contrast, foaming and substrate stratification were not observed at the other two plants with internal circulation mixing. The abundance of methanogens (Methanomicrobia) at the top was about four times higher than at the bottom, correlating to much higher methane production from the top verified by ex-situ biomethane assay, causing foaming. This result is consistent with foaming potential assessment of digestate samples from the digester.
Nguyen, LN, Labeeuw, L, Commault, AS, Emmerton, B, Ralph, PJ, Johir, MAH, Guo, W, Ngo, HH & Nghiem, LD 2019, 'Validation of a cationic polyacrylamide flocculant for the harvesting fresh and seawater microalgal biomass', Environmental Technology and Innovation, vol. 16.View/Download from: UTS OPUS or Publisher's site
© 2019 Elsevier B.V. A simple, efficient, and fast settling flocculation technique to harvest microalgal biomass was demonstrated using a proprietary cationic polyacrylamide flocculant for a freshwater (Chlorella vulgaris) and a marine (Phaeodactylum tricornutum) microalgal culture at their mid-stationary growth phase. The optimal flocculant doses were 18.9 and 13.7 mg/g of dry algal biomass for C. vulgaris and P. tricornutum, respectively (equivalent to 7 g per m3 of algal culture for both species). The obtained optimal dose was well corroborated with changes in cell surface charge, and culture solution optical density and turbidity. At the optimal dose, charge neutralization of 64 and 86% was observed for C. vulgaris and P. tricornutum algal cells, respectively. Algae recovery was independent of the culture solution pH in the range of pH 6 to 9. Algal biomass recovery was achieved of 100 and 90% for C vulgaris and P. tricornutum respectively, and over 98% medium recovery was achievable by simple decanting.
Nguyen, AQ, Wickham, R, Nguyen, LN, Phan, HV, Galway, B, Bustamante, H & Nghiem, LD 2018, 'Impact of anaerobic co-digestion between sewage sludge and carbon-rich organic waste on microbial community resilience', ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY, vol. 4, no. 12, pp. 1956-1965.View/Download from: UTS OPUS or Publisher's site
Nguyen, L, Nghiem, DL & Oh, S 2018, 'Aerobic biotransformation of the antibiotic ciprofloxacin by Bradyrhizobium sp. isolated from activated sludge', Chemosphere, vol. 211, pp. 600-607.View/Download from: UTS OPUS or Publisher's site
Asif, MB, Nguyen, LN, Hai, FI, Price, WE & Nghiem, LD 2017, 'Integration of an enzymatic bioreactor with membrane distillation for enhanced biodegradation of trace organic contaminants', International Biodeterioration and Biodegradation, vol. 124, pp. 73-81.View/Download from: UTS OPUS or Publisher's site
© 2017 Elsevier Ltd A novel membrane distillation – enzymatic membrane bioreactor (MD-EMBR) system was developed for efficient degradation of trace organic contaminants (TrOCs). Degradation of five TrOCs, namely carbamazepine, oxybenzone, diclofenac, atrazine and sulfamethoxazole was examined using two commercially available laccases (from Trametes versicolor and Aspergillus oryzae). The MD system ensured complete retention ( > 99%) of both enzyme and TrOCs. Of particular interest was that the complete retention of the TrOCs resulted in high TrOC degradation by both laccases. Oxybenzone and diclofenac degradation in the MD-EMBR ranged between 80 and 99%. Compared to previously developed EMBRs, as much as 40% improvement in the removal of resistant non-phenolic TrOCs (e.g., carbamazepine) was observed. Laccase from A. oryzae demonstrated better TrOC degradation and enzymatic stability. With the addition of redox mediators, namely 1-hydroxybenzotriazole (HBT) or violuric acid (VA), TrOC degradation was improved by 10–20%. This is the first demonstration of a laccase-based high retention membrane bioreactor for enhanced biodegradation of TrOCs.
Nguyen, LN, Hai, FI, McDonald, JA, Khan, SJ, Price, WE & Nghiem, LD 2017, 'Continuous transformation of chiral pharmaceuticals in enzymatic membrane bioreactors for advanced wastewater treatment', WATER SCIENCE AND TECHNOLOGY, vol. 76, no. 7, pp. 1816-1826.View/Download from: UTS OPUS or Publisher's site
Ji, C, Nguyen, LN, Hou, J, Hai, FI & Chen, V 2017, 'Direct immobilization of laccase on titania nanoparticles from crude enzyme extracts of P. ostreatus culture for micro-pollutant degradation', SEPARATION AND PURIFICATION TECHNOLOGY, vol. 178, pp. 215-223.View/Download from: Publisher's site
Ashe, B, Nguyen, LN, Hai, FI, Lee, D-J, van de Merwe, JP, Leusch, FDL, Price, WE & Nghiem, LD 2016, 'Impacts of redox-mediator type on trace organic contaminants degradation by laccase: Degradation efficiency, laccase stability and effluent toxicity', INTERNATIONAL BIODETERIORATION & BIODEGRADATION, vol. 113, pp. 169-176.View/Download from: Publisher's site
Hai, FI, Nguyen, LN, Nghiem, LD, Liao, BQ, Koyuncu, I & Price, WE 2016, 'Trace Organic Contaminants Removal by Combined Processes for Wastewater Reuse', Handbook of Environmental Chemistry, vol. 45, pp. 39-77.View/Download from: Publisher's site
© 2016 Springer International Publishing Switzerland. The term trace organic contaminant (TrOC) refers to a diverse and expanding array of natural as well as anthropogenic substances including industrial chemicals, chemicals used in households, compounds and their metabolites excreted by people and by-products formed during wastewater and drinking-water treatment processes. Activated sludge-based processes (e.g. membrane bioreactor) are environmentally friendly approaches to wastewater treatment. However, conventional biological treatment alone may not be effective for all TrOCs that are known to occur in municipal and industrial wastewater. The low removal efficiency of biologically persistent and hydrophilic TrOCs necessitates the integration of MBR with other membrane-based and physicochemical processes to ensure adequate removal of TrOCs. Because MBRs can produce effluent with low turbidity and bulk organic content, significant synergy can be realised when it is integrated with other advanced treatment processes. In addition, given the small physical footprint of the MBR process, it is possible to deploy these integrated systems for decentralised water recycling applications. This chapter provides a brief overview of the integration of advanced treatment processes including activated carbon adsorption, advanced oxidation processes and high retention membranes (e.g. nanofiltration and reverse osmosis) with MBR for TrOC removal.
Nguyen, LN, Hai, FI, Dosseto, A, Richardson, C, Price, WE & Nghiem, LD 2016, 'Continuous adsorption and biotransformation of micropollutants by granular activated carbon-bound laccase in a packed-bed enzyme reactor', BIORESOURCE TECHNOLOGY, vol. 210, pp. 108-116.View/Download from: Publisher's site
Nguyen, LN, van de Merwe, JP, Hai, FI, Leusch, FDL, Kang, J, Price, WE, Roddick, F, Magram, SF & Nghiem, LD 2016, 'Laccase-syringaldehyde-mediated degradation of trace organic contaminants in an enzymatic membrane reactor: Removal efficiency and effluent toxicity', BIORESOURCE TECHNOLOGY, vol. 200, pp. 477-484.View/Download from: Publisher's site
Nguyen, LN, Hai, FI, Price, WE, Kang, J, Leusch, FDL, Roddick, F, van de Merwe, JP, Magram, SF & Nghiem, LD 2015, 'Degradation of a broad spectrum of trace organic contaminants by an enzymatic membrane reactor: Complementary role of membrane retention and enzymatic degradation', INTERNATIONAL BIODETERIORATION & BIODEGRADATION, vol. 99, pp. 115-122.View/Download from: Publisher's site
Nguyen, LN, Hai, FI, Kang, J, Leusch, FDL, Roddick, F, Magram, SF, Price, WE & Nghiem, LD 2014, 'Enhancement of trace organic contaminant degradation by crude enzyme extract from Trametes versicolor culture: Effect of mediator type and concentration', JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS, vol. 45, no. 4, pp. 1855-1862.View/Download from: Publisher's site
Nguyen, LN, Hai, FI, Nghiem, LD, Kang, J, Price, WE, Park, C & Yamamoto, K 2014, 'Enhancement of removal of trace organic contaminants by powdered activated carbon dosing into membrane bioreactors', JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS, vol. 45, no. 2, pp. 571-578.View/Download from: Publisher's site
Nguyen, LN, Hai, FI, Price, WE, Leusch, FDL, Roddick, F, McAdam, EJ, Magram, SF & Nghiem, LD 2014, 'Continuous biotransformation of bisphenol A and diclofenac by laccase in an enzymatic membrane reactor', INTERNATIONAL BIODETERIORATION & BIODEGRADATION, vol. 95, pp. 25-32.View/Download from: Publisher's site
Nguyen, LN, Hai, FI, Yang, S, Kang, J, Leusch, FDL, Roddick, F, Price, WE & Nghiem, LD 2014, 'Removal of pharmaceuticals, steroid hormones, phytoestrogens, UV-filters, industrial chemicals and pesticides by Trametes versicolor: Role of biosorption and biodegradation', INTERNATIONAL BIODETERIORATION & BIODEGRADATION, vol. 88, pp. 169-175.View/Download from: Publisher's site
Nguyen, LN, Hai, FI, Price, WE, Leusch, FD, Roddick, F, Ngo, H, Guo, W, Magram, SF & Nghiem, LD 2014, 'The effects of mediator and granular activated carbon addition on degradation of trace organic contaminants by an enzymatic membrane reactor', Bioresource Technology, vol. 167, pp. 169-177.View/Download from: UTS OPUS or Publisher's site
The removal of four recalcitrant trace organic contaminants (TrOCs), namely carbamazepine, diclofenac, sulfamethoxazole and atrazine by laccase in an enzymatic membrane reactor (EMR) was studied. Laccases are not effective for degrading non-phenolic compounds; nevertheless, 2255% removal of these four TrOCs was achieved by the laccase EMR. Addition of the redox-mediator syringaldehyde (SA) to the EMR resulted in a notable dose-dependent improvement (1545%) of TrOC removal affected by inherent TrOC properties and loading rates. However, SA addition resulted in a concomitant increase in the toxicity of the treated effluent. A further 1425% improvement in aqueous phase removal of the TrOCs was consistently observed following a one-off dosing of 3 g/L granular activated carbon (GAC). Mass balance analysis reveals that this improvement was not due solely to adsorption but also enhanced biodegradation. GAC addition also reduced membrane fouling and the SA-induced toxicity of the effluent.
Nguyen, LN, Hai, FI, Kang, J, Price, WE & Nghiem, LD 2013, 'Coupling granular activated carbon adsorption with membrane bioreactor treatment for trace organic contaminant removal: Breakthrough behaviour of persistent and hydrophilic compounds', JOURNAL OF ENVIRONMENTAL MANAGEMENT, vol. 119, pp. 173-181.View/Download from: Publisher's site
Nguyen, LN, Hai, FI, Kang, J, Price, WE & Nghiem, LD 2013, 'Removal of emerging trace organic contaminants by MBR-based hybrid treatment processes', INTERNATIONAL BIODETERIORATION & BIODEGRADATION, vol. 85, pp. 474-482.View/Download from: Publisher's site
Nguyen, LN, Hai, FI, Yang, S, Kang, J, Leusch, FDL, Roddick, F, Price, WE & Nghiem, LD 2013, 'Removal of trace organic contaminants by an MBR comprising a mixed culture of bacteria and white-rot fungi', BIORESOURCE TECHNOLOGY, vol. 148, pp. 234-241.View/Download from: Publisher's site
Yang, S, Hai, FI, Nghiem, LD, Nguyen, LN, Roddick, F & Price, WE 2013, 'Removal of bisphenol A and diclofenac by a novel fungal membrane bioreactor operated under non-sterile conditions', INTERNATIONAL BIODETERIORATION & BIODEGRADATION, vol. 85, pp. 483-490.View/Download from: Publisher's site
Nguyen, LN, Hai, F, Kang, J, Nghiem, LD, Price, WE, Guo, W, Ngo, H & Tung, K 2013, 'Comparison between sequential and simultaneous application of activated carbon with membrane bioreactor for trace organic contaminant removal', Bioresource Technology, vol. 130, pp. 412-417.View/Download from: UTS OPUS or Publisher's site
The removal efficiency of 22 selected trace organic contaminants by sequential application of granular activated carbon (GAC) and simultaneous application of powdered activated carbon (PAC) with membrane bioreactor (MBR) was compared in this study. Both sequential application of GAC following MBR treatment (MBRâGAC) and simultaneous application of PAC within MBR (PACâMBR) achieved improved removal (over 95%) of seven hydrophilic and biologically persistent compounds, which were less efficiently removed by MBR-only treatment (negligible to 70%). However, gradual breakthrough of these compounds occurred over an extended operation period. Charged compounds, particularly, fenoprop and diclofenac, demonstrated the fastest breakthrough (complete and 50â70%, in MBRâGAC and PACâMBR, respectively). Based on a simple comparison from the long-term performance stability and activated carbon usage points of view, PACâMBR appears to be a better option than MBRâGAC treatment.
Nguyen, LN, Hai, FI, Kang, J, Price, WE & Nghiem, LD 2012, 'Removal of trace organic contaminants by a membrane bioreactor-granular activated carbon (MBR-GAC) system', BIORESOURCE TECHNOLOGY, vol. 113, pp. 169-173.View/Download from: Publisher's site
Hai, FI, Tessmer, K, Nguyen, LN, Kang, J, Price, WE & Nghiem, LD 2011, 'Removal of micropollutants by membrane bioreactor under temperature variation', JOURNAL OF MEMBRANE SCIENCE, vol. 383, no. 1-2, pp. 144-151.View/Download from: Publisher's site
Deng, L, Guo, W, Ngo, HH, Nguyen, LD, Nguyen, LN, Liu, Y & Bui, XT 2020, 'Aerobic membrane bioreactors for municipal wastewater treatment' in Current Developments in Biotechnology and Bioengineering, Elsevier, pp. 103-128.View/Download from: Publisher's site
Nghiem, LD, Nguyen, LN, Phan, HV, Ngo, HH, Guo, W & Hai, F 2020, 'Aerobic membrane bioreactors and micropollutant removal' in Current Developments in Biotechnology and Bioengineering, Elsevier, pp. 147-162.View/Download from: Publisher's site
Song, X, Luo, W, Nguyen, LN, Ngo, HH, Guo, W & Nghiem, LD 2020, 'Anaerobic membrane bioreactors for emerging pollutants removal' in Current Developments in Biotechnology and Bioengineering, Elsevier, pp. 197-218.View/Download from: Publisher's site
Nguyen, LN, Nguyen, AQ & Nghiem, LD 2019, 'Microbial Community in Anaerobic Digestion System: Progression in Microbial Ecology' in Bui, X-T, Chiemchaisri, C, Fujioka, T & Varjani, S (eds), Water and Wastewater Treatment Technologies, Springer Singapore, pp. 331-355.View/Download from: UTS OPUS or Publisher's site
Anaerobic digestion (AD) is a biochemical process that involves four microorganism groups, namely, hydrolyzers, acidogens, acetogens, and methanogens. These groups function in syntrophy and have intra-dependent metabolic pathways. Changes in one group (e.g., over-/underexpressed population and function) can alter this chain of anaerobic process and consequently AD performance. With recent progress in culture-independent techniques, an array of previously unknown and uncultured microorganisms has been recently uncovered in the AD process. Discoveries on the diversity and structure of the AD microbial community can provide new information on digester stability and performance (e.g., biogas production). This chapter provided a critical analysis of the current knowledge on the AD microbial community, focusing on the factors affecting microbial community and the relationship between microbial community and AD performance. Gaining a better understanding of microbial ecology could be the key for greater AD efficiency and biogas production capacity.
Hai, FI, Alturki, A, Nguyen, LN, Price, WE & Nghiem, LD 2016, 'Removal of trace organic contaminants by integrated membrane processes for water reuse applications' in Green Technologies for Sustainable Water Management, pp. 533-578.View/Download from: Publisher's site
© 2016 American Society of Civil Engineers. This chapter discusses advanced technologies for the removal of emerging trace organic contaminants (TrOCs) from wastewater for reuse purposes. In particular, integrated membrane processes for TrOC removal are delineated. In the environment, TrOCs may be present as a mixture of various compounds and their transformation products. Mixtures of TrOCs may impose a more complicated effect when compared to that of a single compound. Water recycling is a pragmatic approach to mitigate or solve the problems of water supply. There is a growing interest in using nontraditional water resources by means of water reclamation and water recycling for long-term sustainability. This chapter explains the removal of TrOCs by existing and advanced treatment processes. Some of the processes include activated carbon adsorption, high-pressure membrane filtration, advanced oxidation processes, and enzymatic degradation. The biomass feature is an important factor for TrOC removal in membrane bioreactor (MBR).
Nguyen, LN, Hai, FI, Nghiem, LD, Kang, J & Price, WE 2010, 'Coupling powdered activated carbon (PAC) adsorption with membrane bioreactor (MBR) treatment for enhanced removal of trace organics', EUROMEMBRANE CONFERENCE 2012, Euromembrane Conference, ELSEVIER SCIENCE BV, London, ENGLAND, pp. 1410-1411.View/Download from: Publisher's site