Article
Environmental Sciences
Andrzej Woznica, Jerzy Karczewski, Czeslaw Klis, Jacek Dlugosz, Przemyslaw Ziemski, Agnieszka Nowak, Tytus Bernas
Summary: This study constructs a multiparameter model to describe the kinetics of a water toxicity sensor and the relationship between signal-to-noise ratio and temperature, pH, oxygen and ammonium concentration. The model demonstrates the performance of ABTOW under non-equilibrium conditions.
Article
Energy & Fuels
Belal Y. Belal, Zunhua Zhang, Junjie Liang, Gesheng Li, Mengni Zhou, Xuan Zeng
Summary: This study evaluates the effects of reformate gas on the combustion characteristics of natural gas fuel. Experimental measurements and numerical simulations show that the addition of reformate gas decreases the burning velocity and stability of the natural gas flame, as well as reduces the production of active radicals.
Article
Biotechnology & Applied Microbiology
Tamara J. H. M. van Bergen, Ana B. Rios-Miguel, Tom M. Nolte, Ad M. J. Ragas, Rosalie van Zelm, Martien Graumans, Paul T. J. Scheepers, Mike S. M. Jetten, A. Jan Hendriks, Cornelia U. Welte
Summary: Pharmaceuticals enter the aquatic environment through wastewater treatment plants and biotransformation plays a key role in reducing environmental risks. This study evaluated potential relationships between biotransformation rate constants of pharmaceuticals, initial concentrations of compounds, and sampling season. The findings suggest that microbial activity, rather than community composition, is responsible for biotransformation, and that the concentration of pharmaceuticals should be taken into account when predicting their fate in WWTPs.
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
(2021)
Article
Engineering, Environmental
Pei Hua, Quan Gao, Zhenyu Wang, Shanshan Jiang, Keila Roberta Ferreira de Oliveira, Dhiogo Okumoto Macedo
Summary: Iron deposits affect chlorine consumption and THM formation in drinking water through various mechanisms, such as accelerating reactions of DOM with chlorine through catalysis and increasing chlorine demand through adsorption. The type of deposits and properties of DOM can influence the extent of these effects.
Article
Energy & Fuels
Zhuofan Shi, Pooya Khodaparast, Sheng Hu, Theodore Tsotsis, Kristian Jessen
Summary: This paper investigates the dissolution and diffusion of methane in liquid hydrocarbon mixtures and finds that the solubility and transport properties of multicomponent mixtures can be accurately predicted from binary mixture measurements. This observation can facilitate accurate prediction of diffusive mass transfer in more complex liquid hydrocarbon mixtures.
Article
Green & Sustainable Science & Technology
Fernando Garcia-Avila, Alex Aviles-Anazco, Juan Ordonez-Jara, Christian Guanuchi-Quezada, Lisveth Flores del Pino, Lia Ramos-Fernandez
Summary: In order to combat the Covid-19 pandemic, it is crucial to ensure high-quality public water supply. A residual chlorine decay model was developed to predict chlorine levels in drinking water, with experimentally determined chlorine decay rates and reaction constants. Simulation results showed that residual chlorine concentrations closely matched actual levels in the drinking water distribution network.
SUSTAINABLE ENVIRONMENT RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Jinha Hwang, Alyssa H. Shin
Summary: Photosynthetic phycobiliprotein complexes from Spirulina maxima were purified and fractioned. A mathematical model was developed to represent the fluorescence decay rate of the fractionated complexes. The model successfully fit the whole period of fluorescence decay trend and considered both exponentially decreasing and linearly decreasing phases.
APPLIED SCIENCES-BASEL
(2022)
Article
Environmental Sciences
Lourenco Sassetti Mendes, Javier L. Lara, Maria Teresa Viseu
Summary: Spillway design is crucial for the effective and safe operation of dams, and advancements in computational fluid dynamics have provided engineers with numerical tools to aid in this process. In a study comparing the two-phase volume-of-fluid model with the complete two-phase Euler model, the latter demonstrated the most accurate results and mesh convergence in lower-nappe aeration.
Article
Environmental Sciences
Chi Zhang, Lianze Yu, Miao Zhang, Jun Wu
Summary: This study used a sequential batch reactor (SBR) with continuous aeration to enrich ammonia oxidation bacteria (AOB) and suppress nitrite oxidation bacteria (NOB) before achieving autotrophic nitrogen removal using anammox granular sludge (AMX) under low ammonium concentration. The experimental results showed high nitrite accumulation efficiency and stable total nitrogen (TN) removal efficiency in the intermittent aerated SBR (IASBR), and the simulation results suggested a higher TN removal efficiency can be achieved by optimizing the aeration strategy and increasing the hydraulic retention time (HRT).
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Jia Kang, Chu-qiong Song, Ning Zhou, Yao-wen Zhang, Shu-li Liu, Gang-fu Song, Wa-ni Zhou
Summary: In this study, a simultaneous storage and growth mechanism for organic nitrogen (ON) was introduced into the activated sludge model 3 (ASM3), resulting in the formation of ASM3-ON. This model accurately predicted the operation of biofilm treatment processes and the formation of dissolved organic nitrogen (DON). The model was validated using lab-scale experiments and was able to accurately predict the variations of key parameters in the biofiltration process.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Review
Biochemistry & Molecular Biology
Andrew G. McDonald, Keith F. Tipton
Summary: Knowledge of the Michaelis-Menten parameters and their meaning in different circumstances is crucial for understanding enzyme function and behavior. However, the abundance of reported values in the literature poses a challenge in assessing the appropriateness and validity of such data for specific purposes. This review focuses on evaluating the fitness for purpose of these published data.
Article
Microbiology
Katherine Salazar Alekseyeva, Gerhard J. Herndl, Federico Baltar
Summary: Marine fungi potentially play a major role in elemental cycles, but limited information is available on their enzymatic activities and how they are affected by environmental parameters.
Article
Engineering, Environmental
Quan Yuan, Zhen Jia, Paul Roots, Fabrizio Sabba, George Wells
Summary: Mathematical modeling is a useful approach to study complex bioprocesses. The study established a mathematical bioprocess model to understand the performance of a novel nitrogen and phosphorus removal reactor. The results show that operational factors can effectively suppress nitrite-oxidizing bacteria (NOB) while maintaining high overall nutrient removal efficiency.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2023)
Article
Engineering, Multidisciplinary
Ijeoma I. Nwajuaku, Jonah C. Agunwamba
Summary: This study evaluated the aeration performance of a hydraulic mixer during photo-oxidation treatment and investigated the effect of mixing intensity on sunlight inactivation of faecal coliforms. The results demonstrated that induced aeration is an economically friendly approach to enhance wastewater treatment in developing nations with long sunshine hours.
RESULTS IN ENGINEERING
(2023)
Article
Engineering, Environmental
Douglas O. Pino-Herrera, Yannick Fayolle, Eric D. van Hullebusch, David Huguenot, Giovanni Esposito, Yoan Pechaud
Summary: The study introduced a two-reference compound model (2RCM) which accurately predicts mass transfer coefficients for organic compounds in gas-liquid transfer processes. Compared to the commonly used proportionality coefficient model (PCM), the 2RCM was found to be more robust and applicable to estimating mass transfer coefficients for all substances.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Yao Huang, Liangying Liu, Guoqiang Liu, Yanyan Gong
Summary: The study investigated the presence and distribution of LABs in Baihaimian River, finding that environmental factors, river flux, and sediment properties may affect the spatial distribution of LABs. Significant correlations were observed between total nitrogen, ammonia nitrogen, and LABs in river water, indicating a common domestic wastewater source. Additionally, the positive correlation between total organic carbon and LABs in sediments suggests that total organic carbon serves as a controlling factor for the redistribution of LABs.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Chemical
Ruilin Su, Simin Li, Wanlin Wu, Chao Song, Guoqiang Liu, Yang Yu
Summary: Membrane separation technology, especially using electrospinning for nanofibrous membranes, has shown great potential in treating oily wastewater and oil-contaminated water due to its flexibility and high efficiency. Recent advancements in superhydrophobic or superhydrophilic electrospun nanofibrous membranes have demonstrated promising oil/water separation performance.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Biotechnology & Applied Microbiology
Deyong Li, Fang Fang, Guoqiang Liu
Summary: This study demonstrated that comammox Nitrospira can adapt well to weakly acidic and low-DO conditions, resulting in efficient nitrification and reduced N2O emissions in wastewater treatment.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2021)
Article
Environmental Sciences
Ju Huang, Xianwei Wu, Zhihong Liang, Yang Yu, Guoqiang Liu
Summary: Dynamic membrane bioreactors rely on in-situ formed biofilms on support materials to reject fine particles in water. With low SRT and repeated water flushing, irremovable biofilms gradually form on support materials, leading to rapid rising in transmembrane pressure. The composition and microbial community between irremovable and removable biofilms differ significantly, affecting biofilm adhesion and removability.
Article
Engineering, Environmental
Guoqiang Liu, Xianwei Wu, Deyong Li, Lugao Jiang, Ju Huang, Li Zhuang
Summary: The study showed that short-term low dissolved oxygen increased N2O emissions, while long-term low DO decreased emissions by increasing the abundance of ammonia oxidizers in the ASP. Long-term low DO reduced AOB abundance but increased AOA, with AOA potentially inhibiting N2O production. The positive correlation between N2O emissions and nitrite concentration became insignificant after 80 days of low DO operation, suggesting that ASPs can reduce N2O production and CO2 emissions by operating with low DO and extended sludge age.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Environmental Sciences
Yuanyuan Si, Jiankun Huang, Zhihong Liang, Guoqiang Liu, Da Chen, Ying Guo, Fei Wang
Summary: The study detected and quantified seven PFAS compounds in river water and sediment samples collected from a tributary of the Liuxi River near Guangzhou, with 6:2 FTOH and PFHpA being the dominant compounds. Correlation analysis showed a significant positive correlation between selected PFASs, indicating most PFASs in sediment were derived from river water. Ecological risk assessment suggested low risks of the detected PFASs to Daphnia magna in the Liuxi River.
ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
(2021)
Article
Environmental Sciences
Lugao Jiang, Yang Yu, Guoqiang Liu
Summary: The study showed that pure biofilms are ideal materials for DMBRs, while the presence of inorganic particles of any size can deteriorate filtration performance. Natural clays were found to decrease DM porosity and lead to significant increases in TMP, highlighting the importance of removing inorganic particles from wastewater to achieve long-term stable operation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Chemical
Ruilin Su, Ling Yu, Liangzhong Li, Da Chen, Hai Liu, Xiaoyun Fan, Guoqiang Liu, Ruixue Ma, Kun An, Yang Yu
Summary: A novel Janus membrane was prepared by electrospinning silica nano particle doped PVDF-HFP nanofibers on a superhydrophilic PDA coated mesh, achieving unidirectional water permeation. The membrane exhibited a large water contact angle difference and stable water flux during oil/water separation process, showing its potential for oily wastewater treatment.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Environmental
Qiaolin Zhang, Ruixue Huang, Lugao Jiang, Zichuan Lu, Ganlin Wu, Juxia Lei, Sifan Liao, Guoqiang Liu, Baowei Li, Jianmin Wang
Summary: The iMLE process exhibited excellent nitrogen removal performance, with effluent COD and ammonia concentrations consistently below 30 mg/L and 1.5 mg/L, and effluent TN concentration consistently below 10 mg-N/L with a removal rate of 78%.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Engineering, Chemical
Guichang Chen, Jinlan Wen, Yang Yu, Mai Liu, Guoqiang Liu
Summary: This study coated a polyvinyl alcohol nanofiber layer on the mesh support materials to simulate the inhabitation of filamentous bacteria. The results showed that the coated mesh had better and more stable effluent quality compared to typical used support materials, without sacrificing operation flux. Proper density of nanofiber as the skeletons can help form dynamic membranes more quickly and stably.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Environmental
Weilu Yang, Mingshan Zhu, Wanbin Li, Guoqiang Liu, Eddy Y. Zeng
Summary: In this study, flexible nanocatalysts with self-regulated metal oxide nanoparticles were synthesized for efficient removal of plasticizers from wastewater. The nanocatalysts showed higher decay kinetics for plasticizers compared to other systems, while also reducing the disposal cost.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Mai Liu, Peipei Meng, Guichang Chen, Ying Guan, Guoqiang Liu
Summary: This study investigated the correlation between structural extracellular polymeric substances and solids retention time and biofilm structures in a dynamic membrane bioreactor. The results showed that alginate-like extracellular polysaccharide was negatively correlated to biofilm hydraulic resistance, while amyloid-like protein was positively correlated to biofilm hydraulic resistance.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Miaomiao Zhang, Guimei Lu, Tangfu Xiao, Enzong Xiao, Xiaoxu Sun, Wangwang Yan, Guoqiang Liu, Qi Wang, Geng Yan, Huaqing Liu, Weimin Sun
Summary: This study reveals the pathways of As(III) and As(V) transformations and the microbial communities involved in alkaline soils. It shows that As(III) oxidation can couple with nitrate reduction, mainly catalyzed by microorganisms containing aioA genes, while As(V) reduction is facilitated by microorganisms with arrA genes. Acidovorax, Hydrogenophaga, and Ramlibacter are the putative nitrate-dependent As(III) oxidizers, and Deinococcus and Serratia are the putative respiratory As(V) reducers.
ENVIRONMENTAL POLLUTION
(2022)
Article
Engineering, Environmental
Huaqing Liu, Rui Xu, Max M. Haggblom, Jian Zhang, Xiaoxu Sun, Peng Gao, Jiayi Li, Wangwang Yan, Wenlong Gao, Pin Gao, Guoqiang Liu, Haihan Zhang, Weimin Sun
Summary: The use of immobile iron-rich particles (IIRP) can enhance arsenic retention and regulate its biotransformation in treatment wetlands (TWs). TWs with IIRP achieved a stable arsenic removal efficiency over a long period of time, while no removal or release of arsenic was observed in TWs without IIRP. IIRP provide additional adsorption sites and increase the stability of adsorbed arsenic.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Zhichang Ren, Yangqi Zhou, Zichuan Lu, Xuechun Liu, Guoqiang Liu
Summary: In this study, the use of permeable materials (nylon meshes) as biocarriers in a biofilm reactor was evaluated and compared with commercial biocarriers for treating slightly polluted water. The mesh-based bioreactor achieved faster and more stable complete nitrification compared to the commercial biocarriers. The porous biofilms formed on the nylon mesh enhanced mass transfer and resulted in better and more stable treatment performance.