Can supervise: YES
Cheng, D, Ngo, HH, Guo, W, Chang, SW, Nguyen, DD, Liu, Y, Shan, X, Nghiem, LD & Nguyen, LN 2020, 'Removal process of antibiotics during anaerobic treatment of swine wastewater.', Bioresource technology, vol. 300, pp. 122707-122707.View/Download from: Publisher's site
High concentrations of antibiotics in swine wastewater pose potentially serious risks to the environment, human and animal health. Identifying the mechanism for removing antibiotics during the anaerobic treatment of swine wastewater is essential for reducing the serious damage they do to the environment. In this study, batch experiments were conducted to investigate the biosorption and biodegradation of tetracycline and sulfonamide antibiotics (TCs and SMs) in anaerobic processes. Results indicated that the removal of TCs in the anaerobic reactor contributed to biosorption, while biodegradation was responsible for the SMs' removal. The adsorption of TCs fitted well with the pseudo-second kinetic mode and the Freundlich isotherm, which suggested a heterogeneous chemisorption process. Cometabolism was the main mechanism for the biodegradation of SMs and the process fitted well with the first-order kinetic model. Microbial activity in the anaerobic sludge might be curtailed due to the presence of high concentrations of SMs.
Bao, T, Damtie, MM, Hosseinzadeh, A, Wei, W, Jin, J, Hoang, NPV, Ye, JS, Liu, Y, Wang, XF, Yu, ZM, Chen, ZJ, Wu, K, Frost, RL & Ni, B-J 2020, 'Bentonite-supported nano zero-valent iron composite as a green catalyst for bisphenol A degradation: Preparation, performance, and mechanism of action', JOURNAL OF ENVIRONMENTAL MANAGEMENT, vol. 260.View/Download from: Publisher's site
© 2020 Elsevier Ltd Triclocarban (TCC) is a highly effective antibacterial agent, which is widely used in a variety of applications and present at significant levels (e.g., 760 μg/L) in wastewater worldwide. However, the interaction between TCC and nitrifiers, important microbial cultures in wastewater treatment plants, has not been documented. This work therefore aimed to evaluate the fate of TCC in a nitrifying culture and its impact on nitrifiers in four long-term nitrifiers-rich reactors, which received synthetic wastewater containing 0, 0.1, 1, or 5 mg/L TCC. Experimental results showed that 36.7%–50.7% of wastewater TCC was removed by nitrifying cultures in stable operation. Mass balance analysis revealed that the removal of TCC was mainly achieved through adsorption rather than biodegradation. Adsorption kinetic analysis indicated that inhomogeneous multilayer adsorption was responsible for the removal while fourier transform infrared spectroscopy indicated that several functional groups such as hydroxyl, amide and polysaccharide seemed to be the main adsorption sites. The adsorbed TCC significantly deteriorated settleability and performance of nitrifying cultures. With an increase of influent TCC from 0 to 5 mg/L, reactor volatile suspended solids and effluent nitrate decreased from 1200 ± 90 mg/L and 300.81 ± 7.52 mg/L to 880 ± 80 and 7.35 ± 4.62 mg/L while effluent ammonium and nitrite increased from 0.41 ± 0.03 and 0.45 ± 0.23 mg/L to104.65 ± 3.46 and 182.06 ± 7.54 mg/L, respectively. TCC increased the extracellular polymeric substances of nitrifying cultures, inhibited the specific activities of nitrifiers, and altered the abundance of nitrifiers especially Nitrospira sp. In particular, TCC at environmentally relevant concentration (i.e., 0.1 mg/L) significantly inhibited NOB activity and reduced NOB population.
Cheng, D, Hao Ngo, H, Guo, W, Wang Chang, S, Duc Nguyen, D, Liu, Y, Zhang, X, Shan, X & Liu, Y 2020, 'Contribution of antibiotics to the fate of antibiotic resistance genes in anaerobic treatment processes of swine wastewater: A review', Bioresource Technology, vol. 299.View/Download from: Publisher's site
© 2019 Elsevier Ltd Antibiotic resistance genes (ARGs) in water environment have become a global health concern. Swine wastewater is widely considered to be one of the major contributors for promoting the proliferation of ARGs in water environments. This paper comprehensively reviews and discusses the occurrence and removal of ARGs in anaerobic treatment of swine wastewater, and contributions of antibiotics to the fate of ARGs. The results reveal that ARGs’ removal is unstable during anaerobic processes, which negatively associated with the presence of antibiotics. The abundance of bacteria carrying ARGs increases with the addition of antibiotics and results in the spread of ARGs. The positive relationship was found between antibiotics and the abundance and transfer of ARGs in this review. However, it is necessary to understand the correlation among antibiotics, ARGs and microbial communities, and obtain more knowledge about controlling the dissemination of ARGs in the environment.
Do, MH, Ngo, HH, Guo, W, Chang, SW, Nguyen, DD, Liu, Y, Varjani, S & Kumar, M 2020, 'Microbial fuel cell-based biosensor for online monitoring wastewater quality: A critical review.', The Science of the total environment, vol. 712, pp. 135612-135612.View/Download from: Publisher's site
Recently, the application of the microbial fuel cell (MFC)-based biosensor for rapid and real-time monitoring wastewater quality is very innovative due to its simple compact design, disposability, and cost-effectiveness. This review represents recent advances in this emerging technology for the management of wastewater quality, where the emphasis is on biochemical oxygen demand, toxicity, and other environmental applications. In addition, the main challenges of this technology are discussed, followed by proposing possible solutions to those challenges based on the existing knowledge of detection principles and signal processing. Potential future research of MFC-based biosensor has been demonstrated in this review.
Hao, Q, Xie, C, Huang, Y, Chen, D, Liu, Y, Wei, W & Ni, B-J 2020, 'Accelerated separation of photogenerated charge carriers and enhanced photocatalytic performance of g-C3N4 by Bi2S3 nanoparticles', CHINESE JOURNAL OF CATALYSIS, vol. 41, no. 2, pp. 249-258.View/Download from: Publisher's site
Li, Y, Wang, D, Yang, G, Yuan, X, Xu, Q, Yang, Q, Liu, Y, Wang, Q, Ni, B-J, Tang, W & Jiang, L 2020, 'Enhanced dewaterability of anaerobically digested sludge by in-situ free nitrous acid treatment', WATER RESEARCH, vol. 169.View/Download from: Publisher's site
Liu, X, He, D, Wu, Y, Xu, Q, Wang, D, Yang, Q, Liu, Y, Ni, BJ, Wang, Q & Li, X 2020, 'Freezing in the presence of nitrite pretreatment enhances hydrogen production from dark fermentation of waste activated sludge', Journal of Cleaner Production, vol. 248.View/Download from: Publisher's site
© 2019 Elsevier Ltd Due to the poor biodegradability of released organics and the rapid consumption of hydrogen, hydrogen production from the untreated waste activated sludge (WAS) and/or inocula is still limited. In this study, it was found that the dark fermentative hydrogen production was largely enhanced from WAS pretreated by freezing in the presence of nitrite. With an increase of nitrite addition from 100 to 400 mg NO2−-N/L during freezing pretreatment (−5 °C for 4 h), the maximal hydrogen yield increased from 7.96 to 19.40 mL/g VS (volatile solids), which was 5.5–13.4 times of that in the control (without freezing and nitrite addition). Mechanism explorations revealed that the proposed pretreatment not only accelerated the disintegration of sludge but also promoted the proportion of biodegradable organics released, thereby provided more bio-available substrates for subsequent hydrogen production. Proposed pretreatment severely suppressed the sludge microorganisms responding to homoacetogenesis (−32.1%), methanogenesis (−58.4%), and sulfate-reducing process (−51.5%), inhibited the consumption of hydrogen. Moreover, there was more acetic and butyric (76% versus 57.5%) but less propionic acid (22.6% versus 13.4%) in this pretreated fermenter, which was in correspondence with the theory of fermentation type affecting hydrogen production. Long-term fermentation experiments indicated that the proposed pretreatment boosted the [FeFe]-hydrogenase activities while suppressed the activities of carbon monoxide dehydrogenase, coenzyme F420, and adenylyl sulfate reductase.
Liu, X, Huang, X, Wu, Y, Xu, Q, Du, M, Wang, D, Yang, Q, Liu, Y, Ni, BJ, Yang, G, Yang, F & Wang, Q 2020, 'Activation of nitrite by freezing process for anaerobic digestion enhancement of waste activated sludge: Performance and mechanisms', Chemical Engineering Journal, vol. 387.View/Download from: Publisher's site
© 2020 Elsevier B.V. Nitrite-based pretreatment was demonstrated to effectively improve anaerobic digestion of waste activated sludge. It was found in this work that the freezing activated nitrite pretreatment could further enhance the performances. With the increase of nitrite addition from 0 to 600 mg NO2−-N/L during freezing process, the biochemical methane potential of pretreated-sludge gradually increased from 191.3 ± 8.0 to 233.2 ± 10.6 mL per gram volatile solid (VS), while only 178.6 ± 7.3 mL/g VS was obtained in the raw sludge. Mechanism explorations revealed that the freezing activated nitrite pretreatment remarkably facilitated the disintegration of sludge. Excitation emission matrix and fluorescence regional integration analyses further revealed that nitrite addition during freezing process promoted the proportion of biodegradable organics released, thereby providing more bio-available substrates for subsequent anaerobic digestion. Freezing condition induced reactive derivatives from nitrite (e.g., free nitrite acid, NO2[rad], N2O3) were assumed to be the major contributors to the enhanced sludge disintegration and recalcitrant organics (e.g., humic acid-like substances) degradation. It was also found that 600 mg NO2−-N/L addition activated by freezing pretreatment produced an anaerobically digested sludge with an improved dewaterability, as indicated by the decrease of the specific resistance to filterability and moisture content of dewatered cake. Moreover, 600 mg NO2−-N/L addition activated by freezing pretreatment and subsequent anaerobic digestion largely inactivated the pathogens to the levels below Class A biosolids requirements. Considering that nitrite can be in-situ produced in wastewater treatment plants through nitritation of the digestion liquid, this nitrite-based freezing process for sludge pretreatment was environmental-friendly and economically attractive.
Peng, L, Nie, W-B, Ding, J, Ni, B-J, Liu, Y, Han, H-J & Xie, G-J 2020, 'Denitrifying Anaerobic Methane Oxidation and Anammox Process in a Membrane Aerated Membrane Bioreactor: Kinetic Evaluation and Optimization.', Environmental science & technology.View/Download from: Publisher's site
Denitrifying anaerobic methane oxidation (DAMO) coupled to anaerobic ammonium oxidation (anammox) is a promising technology for complete nitrogen removal with economic and environmental benefit. In this work, a model framework integrating DAMO and anammox process was constructed based on suspended-growth systems. The proposed model was calibrated and validated using experimental data from a sequencing batch reactor and a membrane aerated membrane bioreactor (MAMBR). The model managed to describe removal rates of ammonium (NH4+), nitrite (NO2-), and total nitrogen, as well as biomass changes of DAMO archaea, DAMO bacteria, and anaerobic ammonium oxidizing bacteria (AnAOB) in both reactors. The estimated parameter values revealed that DAMO archaea possessed properties of faster growth and higher biomass yield in suspended-growth systems compared to those in attached-growth systems (e.g., biofilm). Model simulation demonstrated that solid retention time (SRT) was effective in washing out DAMO bacteria, but retaining DAMO archaea and AnAOB in the MAMBR. The optimal SRT and nitritation efficiency (the ratio of the NO2- to the sum of NH4+ and NO2- in the MAMBR influent) were simulated so that 99% of total nitrogen was removed to meet the discharge standard. MAMBR further suggested to be operated with SRT between 15 and 30 days so that the optimal nitritation efficiency could be minimized to 49% for cost savings.
Ren, Y, Huu, HN, Guo, W, Wang, D, Peng, L, Ni, B-J, Wei, W & Liu, Y 2020, 'New perspectives on microbial communities and biological nitrogen removal processes in wastewater treatment systems', BIORESOURCE TECHNOLOGY, vol. 297.View/Download from: Publisher's site
Vo, HNP, Ngo, HH, Guo, W, Liu, Y, Woong Chang, S, Nguyen, DD, Zhang, X, Liang, H & Xue, S 2020, 'Selective carbon sources and salinities enhance enzymes and extracellular polymeric substances extrusion of Chlorella sp. for potential co-metabolism', Bioresource Technology, vol. 303.View/Download from: Publisher's site
© 2020 Elsevier Ltd This study investigated the extracellular polymeric substance (EPS) and enzyme extrusion of Chlorella sp. using seven carbon sources and two salinities for potential pollutant co-metabolism. Results indicated that the levels of biomass, EPS and enzymes of microalgae cultured with glucose and saccharose outcompeted other carbon sources. For pigment production, glycine received the highest chlorophyll and carotene, up to 10 mg/L. The EPS reached 30 mg/L, having doubled the amount of protein than carbohydrate. For superoxide dismutase and peroxidase enzymes, the highest concentrations were beyond 60 U/ml and 6 nmol/d.ml, respectively. This amount could be potentially used for degrading 40% ciprofloxacin of concentration 2000 µg/L. When increasing salinity from 0.1% to 3.5%, the concentrations of pigment, EPS and enzymes rose 3 to 30 times. These results highlighted that certain carbon sources and salinities could induce Chlorella sp. to produce EPS and enzymes for pollutant co-metabolism and also for revenue-raising potential.
Wei, W, Guo, W, Ngo, HH, Mannina, G, Wang, D, Chen, X, Liu, Y, Peng, L & Ni, BJ 2020, 'Enhanced high-quality biomethane production from anaerobic digestion of primary sludge by corn stover biochar', Bioresource Technology, vol. 306.View/Download from: Publisher's site
© 2020 Elsevier Ltd This study conducted batch and continuous tests to reveal the feasibility of corn stover biochar on improving anaerobic digestion of primary sludge (PS). Dosing biochar (1.82, 2.55 and 3.06 g/g Total Solids (TS)) in digester improved methane content increasing from 67.5% to 81.3–87.3% and enhanced methane production by 8.6–17.8%. Model analysis indicated that biochar accelerated PS hydrolysis and enhanced methane potential of PS. The mechanistic studies showed that biochar enhanced process stability provided by strong buffering capacity and alleviated NH3 inhibition. In continuous test over 116 days, the volatile solids (VS) destruction in the biochar-dosed digester increased by 14.9%, resulting in a 14% reduction in the volume of digestate for disposal. Biochar changed microbial community in an expected direction for anaerobic digestion. This work suggests that biochar technology would apply to co-digestion of WAS and PS to maximize the energy recovery and sludge reduction from the two sludge streams.
Xu, Q, Liu, X, Yang, G, Wang, D, Wu, Y, Li, Y, Huang, X, Fu, Q, Wang, Q, Liu, Y, Li, X & Yang, Q 2020, 'Norfloxacin-induced effect on enhanced biological phosphorus removal from wastewater after long-term exposure', Journal of Hazardous Materials, vol. 392.View/Download from: Publisher's site
© 2020 Elsevier B.V. In this study, long-term experiments were performed under synthetic wastewater conditions to evaluated the potential impacts of norfloxacin (NOR) (10, 100 and 500 μg/L) on enhanced biological phosphorus removal (EBPR). Experimental result showed that long-term exposure to 10 μg/L NOR induced negligible effects on phosphorus removal. The presence of 100 μg/L NOR slightly decreased phosphorus removal efficiency to 94.41 ± 1.59 %. However, when NOR level further increased to 500 μg/L, phosphorus removal efficiency was significantly decreased from 97.96 ± 0.8 5% (control) to 82.33 ± 3.07 %. The mechanism study revealed that the presence of 500 μg/L NOR inhibited anaerobic phosphorus release and acetate uptake as well as aerobic phosphorus uptake during long-term exposure. It was also found that 500 μg/L NOR exposure suppressed the activity of key enzymes related to phosphorus removal but promoted the transformations of intracellular polyhydroxyalkanoate and glycogen. Microbial analysis revealed that that the presence of 500 μg/L NOR reduced the abundances of polyphosphate accumulating organisms but increased glycogen accumulating organisms, as compared the control.
Yang, J, Liu, X, Wang, D, Xu, Q, Yang, Q, Zerig, G, Li, X, Liu, Y, Gong, J, Ye, J & Li, H 2019, 'Mechanisms of peroxymonosulfate pretreatment enhancing production of short-chain fatty acids from waste activated sludge', WATER RESEARCH, vol. 148, pp. 239-249.View/Download from: Publisher's site
Chen, Z, Liu, Y, Wei, W & Ni, BJ 2019, 'Recent advances in electrocatalysts for halogenated organic pollutant degradation', Environmental Science: Nano, vol. 6, no. 8, pp. 2332-2366.View/Download from: Publisher's site
© The Royal Society of Chemistry 2019. Electrocatalysis has recently been extensively employed for the degradation of halogenated organic pollutants (HOPs) that normally act as persistent, toxic, and bioaccumulative substances in the environment and pose threats to aquatic species as well as human beings. This review article broadly gives the up-to-date status on promising electrocatalysts for the degradation of HOPs, with particular emphasis on the strategies for promoting the activities of catalysts. Firstly, the catalysts for the oxidative mineralization process including metallic oxide- and carbon-based anodes, as well as the oxidative dehalogenation mechanism of these catalysts, are comprehensively presented. Secondly, the catalysts for the reductive degradation process, which involves metal- and metal complex-based cathodes, together with their applications and organic transformation pathways, are fully analyzed. Thirdly, recent advances in the integrated techniques are introduced, and the integration of membrane techniques, biological methods, Fenton processes, and photocatalysis with electrocatalysis is discussed. Finally, several key directions for further research are exploited, which include catalyst design, experimental optimization, scientific exploration, and effective coupling techniques.
Ye, Y, Jiao, J, Kang, D, Jiang, W, Kang, J, Ngo, HH, Guo, W & Liu, Y 2019, 'The adsorption of phosphate using a magnesia-pullulan composite: kinetics, equilibrium, and column tests.', Environmental science and pollution research international, vol. 26, no. 13, pp. 13299-13310.View/Download from: Publisher's site
A magnesia-pullulan (MgOP) composite has been developed to remove phosphate from a synthetic solution. In the present study, the removal of phosphate by MgOP was evaluated in both a batch and dynamic system. The batch experiments investigated the initial pH effect on the phosphate removal efficiency from pH 3 to 12 and the effect of co-existing anions. In addition, the adsorption isotherms, thermodynamics, and kinetics were also investigated. The results from the batch experiments indicate that MgOP has encouraging performance for the adsorption of phosphate, while the initial pH value (3-12) had a negligible influence on the phosphate removal efficiency. Analysis of the adsorption thermodynamics demonstrated that the phosphate removal process was endothermic and spontaneous. Investigations into the dynamics of the phosphate removal process were carried out using a fixed bed of MgOP, and the resulting breakthrough curves were used to describe the column phosphate adsorption process at various bed masses, volumetric flow rates, influent phosphate concentrations, reaction temperatures, and inlet pH values. The results suggest that the adsorption of phosphate on MgOP was improved using an increased bed mass, while the reaction temperature did not significantly affect the performance of the MgOP bed during the phosphate removal process. Furthermore, higher influent phosphate concentrations were beneficial towards increasing the column adsorption capacity for phosphate. Several mathematic models, including the Adams-Bohart, Wolboska, Yoon-Nelson, and Thomas models, were employed to fit the fixed-bed data. In addition, the effluent concentration of magnesium ions was measured and the regeneration of MgOP investigated.
Liu, Y, Li, C, Lackner, S, Wagner, M & Horn, H 2018, 'The role of interactions of effective biofilm surface area and mass transfer in nitrogen removal efficiency of an integrated fixed-film activated sludge system', Chemical Engineering Journal, vol. 350, pp. 992-999.View/Download from: UTS OPUS or Publisher's site
© 2018 Elsevier B.V. A reaction-diffusion biofilm model was implemented to simulate the nitrification/denitrification performance of a lab-scale integrated fixed-film activated sludge (IFAS) reactor. The model was capable of representing the system performance, i.e. changes in organic load and decrease in sludge age. Furthermore, nitrification batch tests with sludge and carrier material could also be simulated successfully with the model. Model simulation revealed that the diffusive fluxes into biofilm depended strongly on substrate loading as well as sludge age. The microbial composition in the biofilm matrix was mainly influenced by the diffusive flux of chemical oxygen demand (COD) into biofilm. When COD removal started to switch to biofilm, heterotrophic bacteria quickly replaced the previously dominating autotrophic bacteria. Running a set of simulations with a range of effective biofilm surface area and different mass transfer coefficients revealed the strong influence of these two parameters on the IFAS performance. The analysis showed that both parameters were dominating factors for ammonium removal. The optimum mass transfer coefficient was in the range of 3–4 m d−1 and the effective biofilm surface was around 63–88% of the theoretical carrier surface.
Zhao, J, Liu, Y, Wang, D, Chen, F, Li, X, Zeng, G & Yang, Q 2017, 'Potential impact of salinity on methane production from food waste anaerobic digestion.', Waste Management, vol. 67, pp. 308-314.View/Download from: UTS OPUS or Publisher's site
Previous studies have demonstrated that the presence of sodium chloride (NaCl) inhibited the production of methane from food waste anaerobic digestion. However, the details of how NaCl affects methane production from food waste remain unknown by now and the efficient approach to mitigate the impact of NaCl on methane production was seldom reported. In this paper, the details of how NaCl affects methane production was first investigated via a series of batch experiments. Experimental results showed the effect of NaCl on methane production was dosage dependent. Low level of NaCl improved the hydrolysis and acidification but inhibited the process of methanogenesis whereas high level of NaCl inhibit both steps of acidification and methanogenesis. Then an efficient approach, i.e. co-digestion of food waste and waste activated sludge, to mitigate the impact of NaCl on methane production was reported. Finally, the mechanisms of how co-digestion mitigates the effect on methane production caused by NaCl in co-digestion system were revealed. These findings obtained in this work might be of great importance for the operation of methane recovery from food waste in the presence of NaCl.
Li, Y, Zhang, Y, Liu, Y, Zhao, Z, Zhao, Z, Liu, S, Zhao, H & Quan, X 2016, 'Enhancement of anaerobic methanogenesis at a short hydraulic retention time via bioelectrochemical enrichment of hydrogenotrophic methanogens', BIORESOURCE TECHNOLOGY, vol. 218, pp. 505-511.View/Download from: UTS OPUS or Publisher's site
Zhu, T, Zhang, Y, Bu, G, Quan, X & Liu, Y 2016, 'Producing nitrite from anodic ammonia oxidation to accelerate anammox in a bioelectrochemical system with a given anode potential', CHEMICAL ENGINEERING JOURNAL, vol. 291, pp. 184-191.View/Download from: UTS OPUS or Publisher's site
Liu, Y, Sharma, KR, Fluggen, M, O'Halloran, K, Murthy, S & Yuan, Z 2015, 'Online dissolved methane and total dissolved sulfide measurement in sewers', WATER RESEARCH, vol. 68, pp. 109-118.View/Download from: Publisher's site
Feng, Y, Liu, Y & Zhang, Y 2015, 'Enhancement of sludge decomposition and hydrogen production from waste activated sludge in a microbial electrolysis cell with cheap electrodes', ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY, vol. 1, no. 6, pp. 761-768.View/Download from: Publisher's site
Methane is a highly potent greenhouse gas and contributes significantly to climate change. Recent studies have shown significant methane production in sewers. The studies conducted so far have relied on manual sampling followed by off-line laboratory-based chromatography analysis. These methods are labor-intensive when measuring methane emissions from a large number of sewers, and do not capture the dynamic variations in methane production. In this study, we investigated the suitability of infrared spectroscopy-based on-line methane sensors for measuring methane in humid and condensing sewer air. Two such sensors were comprehensively tested in the laboratory. Both sensors displayed high linearity (R2 > 0.999), with a detection limit of 0.023% and 0.110% by volume, respectively. Both sensors were robust against ambient temperature variations in the range of 5 to 35°C. While one sensor was robust against humidity variations, the other was found to be significantly affected by humidity. However, the problem was solved by equipping the sensor with a heating unit to increase the sensor surface temperature to 35°C. Field studies at three sites confirmed the performance and accuracy of the sensors when applied to actual sewer conditions, and revealed substantial and highly dynamic methane concentrations in sewer air.
Liu, Y, Zhang, Y, Quan, X, Li, Y, Zhao, Z, Meng, X & Chen, S 2012, 'Optimization of anaerobic acidogenesis by adding Fe0 powder to enhance anaerobic wastewater treatment', Chemical Engineering Journal, vol. 192, pp. 179-185.View/Download from: UTS OPUS or Publisher's site
Acidogenesis is responsible to convert complex organics into volatile fatty acids (VFA), whose metabolic rate and production type have important effects on the whole anaerobic digestion. A novel strategy for enhancing anaerobic wastewater treatment via dosing Fe powder (40g) in an acidogenic reactor (2L) is described. The results showed that the hydrolysis/fermentation was accelerated by Fe dosing. As a result, the acidogenic performances in COD removal (45-56%) and VFA production (1170-1340mg/L) were less affected by shortened hydraulic retention time (HRT) from 6 to 2h. However, COD removal declined to 25% and VFA production decreased to 661mg/L in a reference reactor without Fe 0 dosing (A2). Besides, Fe 0 dosing optimized fermentation type, namely, the production of propionate was decreased, which was favorable for subsequent acetogenesis and methanogenesis. Fluorescence in situ hybridization (FISH) analysis indicated that Fe 0 dosing increased the abundance of acidogens, especially acetogens. The methanogenic reactor fed with the effluent of A1 had higher COD removal and treatment stability with almost no propionate detected. These results suggested that the enhancement of acidification by Fe 0 powder dosing was helpful to accelerate and improve anaerobic acidogenesis to create a favorable feeding condition for the subsequent treatment. © 2012 Elsevier B.V..
Liu, Y, Zhang, Y, Zhao, Z, Li, Y, Quan, X & Chen, S 2012, 'Enhanced azo dye wastewater treatment in a two-stage anaerobic system with Fe-0 dosing', BIORESOURCE TECHNOLOGY, vol. 121, pp. 148-153.View/Download from: UTS OPUS or Publisher's site
Zhang, Y, Liu, Y, Jing, Y, Zhao, Z & Quan, X 2012, 'Steady performance of a zero valent iron packed anaerobic reactor for azo dye wastewater treatment under variable influent quality', JOURNAL OF ENVIRONMENTAL SCIENCES, vol. 24, no. 4, pp. 720-727.View/Download from: UTS OPUS or Publisher's site
Liu, Y, Zhang, Y, Quan, X, Chen, S & Zhao, H 2011, 'Applying an electric field in a built-in zero valent iron - Anaerobic reactor for enhancement of sludge granulation', WATER RESEARCH, vol. 45, no. 3, pp. 1258-1266.View/Download from: UTS OPUS or Publisher's site
Liu, Y, Zhang, Y, Quan, X, Zhang, J, Zhao, H & Chen, S 2011, 'Effects of an electric field and zero valent iron on anaerobic treatment of azo dye wastewater and microbial community structures', BIORESOURCE TECHNOLOGY, vol. 102, no. 3, pp. 2578-2584.View/Download from: UTS OPUS or Publisher's site
Zhang, Y, Jing, Y, Quan, X, Liu, Y & Onu, P 2011, 'A built-in zero valent iron anaerobic reactor to enhance treatment of azo dye wastewater', WATER SCIENCE AND TECHNOLOGY, vol. 63, no. 4, pp. 741-746.View/Download from: UTS OPUS or Publisher's site
Zhang, J, Zhang, Y, Quan, X, Liu, Y, An, X, Chen, S & Zhao, H 2011, 'Bioaugmentation and functional partitioning in a zero valent iron-anaerobic reactor for sulfate-containing wastewater treatment', CHEMICAL ENGINEERING JOURNAL, vol. 174, no. 1, pp. 159-165.View/Download from: UTS OPUS or Publisher's site
Ngo, HH, Khan, MA, Guo, W, Liu, Y, Zhang, X, Li, J & Wang, J 2020, 'Energy production in anaerobic membrane bioreactors: Opportunities and challenges' in Current Developments in Biotechnology and Bioengineering, Elsevier, pp. 309-333.View/Download from: Publisher's site
Peng, L, Liu, Y, Sun, J & Ni, B-J 2017, 'Microbial Remediation of Chromium-Contaminated Wastes' in Handbook of Metal-Microbe Interactions and Bioremediation, CRC Press, pp. 689-706.View/Download from: Publisher's site
Liu, Y, Wang, Q, Zhang, Y & Ni, B-J 2016, 'Zero Valent Iron Significantly Enhances Methane Production from Waste Activated Sludge by Improving Biochemical Methane Potential Rather Than Hydrolysis Rate' in Environmental Engineering and Activated Sludge Processes, Apple Academic Press, pp. 219-236.View/Download from: Publisher's site
Liu, Y, 'Measurement and understanding of methane emission from sewers'.