Article
Environmental Sciences
Miao Zhang, Jing Gao, Yajun Fan, Quanlong Liu, Chenjie Zhu, Liying Ge, Chengda He, Jun Wu
Summary: This study compared two types of continuous stirred tank moving bed biofilm reactors (ST-MBBR) and plug flow MBBR (PF-MBBR) for nitrification, finding that the PF-MBBR had strong temperature shock resistance and a higher ammonium oxidation ratio, while the ST-MBBR had higher average biomass and biofilm thickness. Different operation modes led to lower nitrite accumulation ratio in the PF-MBBR, and nitrification kinetics revealed contrasting performances due to temperature shock.
Article
Engineering, Environmental
Ge Zhu, Haiyun Zhang, Ru Yuan, Meng Huang, Fei Liu, Mo Li, Yongming Zhang, Bruce E. Rittmann
Summary: Many wastewater-treatment plants face the problem of inhibitory compounds from chemical or pharmaceutical facilities affecting the nitrification process, which is crucial for nitrogen removal. This study focuses on the inhibition caused by quinoline and how it can be relieved by bioaugmentation with Comamonas testosteroni or Rhodococcus ruber. Acceleration of nitrification was observed after the disappearance of the quinoline intermediate, 2-hydroxyl quinoline (2HQ), due to the addition of R. ruber or C. testosteroni. R. ruber showed superior abilities in 2HQ biodegradation and the acceleration of nitrification compared to C. testosteroni.
Article
Soil Science
Yue Li, Xiaotang Ju, Di Wu
Summary: Nitrogen fertilization is the main source of nitrous oxide (N2O) emissions in agricultural soils, but the reasons for the varied response of N2O emissions to N fertilizer are not clear. This study investigated the effects of ammonium-based fertilizers and nitrification inhibitors on N2O emissions in upland agricultural soils in northern China. The results showed that the variations in N2O emissions were strongly correlated with soil nitrite dynamics, and that alkaline soils had higher ammonia oxidation potential and higher N2O emissions.
SOIL BIOLOGY & BIOCHEMISTRY
(2023)
Article
Soil Science
Pengpeng Duan, Xinyi Yang, Xunyang He, Yonglei Jiang, Kongcao Xiao, Kelin Wang, Dejun Li
Summary: This study investigated the pathways of N2O production in soils collected from different topographic positions in a subtropical forest. The results showed that autotrophic nitrification pathways were the major source of N2O production, while denitrification pathways were minor sources. Chronic N addition stimulated ammonia oxidation-derived N2O in both the valley and slope, but had different effects on other pathways. Overall, this study provides insights into the regulation of N2O production and its pathways in a subtropical forest.
BIOLOGY AND FERTILITY OF SOILS
(2022)
Article
Environmental Sciences
Xianhui S. Wan, Hua-Xia Sheng, Minhan Dai, Matthew J. Church, Wenbin Zou, Xiaolin Li, David A. Hutchins, Bess B. Ward, Shuh-Ji Kao
Summary: This study reveals that the distribution of nitrite in the ocean is influenced by interactions between phytoplankton, nitrifiers, and environmental factors such as light and nutrient availability. The processes controlling nitrite cycling vary across different regions, leading to differential nitrite concentrations and turnover rates.
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Environmental Sciences
Shaokui Zheng, Xiangnan Zheng, Mengya Guo, Shida Li
Summary: By comparing the ammonia-oxidizing activities of three pathways (heterotrophic or autotrophic aerobic ammonia oxidation, and anammox), the study investigates the contributions of these pathways to wastewater biological nitrogen removal systems. The key challenge lies in accurately determining the potential heterotrophic aerobic ammonia-oxidizing (PHAe) activity when potential autotrophic aerobic ammonia-oxidizing (PAAe) activity also contributes to ammonia oxidation. By subtracting the PAAe activity from the combination of PAAe and PHAe activity, the feasibility of evaluating PHAe activity in the absence of a metabolic inhibitor is demonstrated.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Baoxuan Chang, Zhifeng Yan, Xiaotang Ju, Xiaotong Song, Yawei Li, Siliang Li, Pingqing Fu, Xia Zhu-Barker
Summary: This study developed a mechanistic model to quantify the N2O production from different biological processes in soil and investigated the influence of climatic-edaphic factors. The model demonstrated its reliability and capability and can potentially improve the assessment of soil N2O emissions.
Article
Environmental Sciences
Xia Jia, Yunfeng Gao, Xiaodi Li, Yonghua Zhao, Lu Wang, Chunyan Zhang
Summary: This study investigated the impacts of elevated CO2 and cadmium levels on soil nitrification in the rhizosphere of Robinia pseudoacacia L. seedlings. The results showed that elevated CO2 combined with Cd pollution generally stimulated nitrification enzyme activities and influenced bacterial community structures.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Kamil Janiak, Anna Jurga, Anna Wizimirska, Stanislaw Miodonski, Mateusz Muszynski-Huhajlo, Krzysztof Ratkiewicz, Bartosz Zieba
Summary: The study demonstrates the impressive ability of nitrifiers to resist temporary inhibition by free ammonia (FA) and restore nitrification with simple remedy actions. High FA concentrations were successfully treated without long lasting adverse effects, leading to a considerable increase in nitrification rate.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Review
Biotechnology & Applied Microbiology
Elaine Cristina Latocheski, Maria Carolina Vieira da Rocha, Maria Cristina Borba Braga
Summary: Nitrification is a common reaction in nitrogen-containing wastewater treatment, and the genus Nitrospira plays a significant role in this process. However, the environmental and operating factors influencing the presence and abundance of Nitrospira in different habitats are not fully understood. Nitrospira bacteria have the potential to adapt to various conditions and have applications in wastewater treatment, but more research is needed.
REVIEWS IN ENVIRONMENTAL SCIENCE AND BIO-TECHNOLOGY
(2022)
Review
Microbiology
Ardhra Vijayan, Rejish Kumar Vattiringal Jayadradhan, Devika Pillai, Preena Prasannan Geetha, Valsamma Joseph, Bright Singh Isaac Sarojini
Summary: The nitrogen cycle plays a crucial role in maintaining ecological balance, with the discovery of nitrification altering our understanding of this process; Nitrospira species, found in diverse environments, exhibit metabolic diversity that is essential for their establishment in different habitats.
JOURNAL OF BASIC MICROBIOLOGY
(2021)
Article
Engineering, Environmental
Mingzhu Yang, Shuang Qiu, Lingfeng Wang, Zhipeng Chen, Yanbing Hu, Jianhua Guo, Shijian Ge
Summary: This study investigated the effects of light irradiation on the activities and physiological characteristics of ammonia-oxidizing bacteria and nitrite-oxidizing bacteria in activated sludge. The results showed that moderate light irradiation could enhance the activity of ammonia-oxidizing bacteria, while excessive light could inhibit the activities of both types of bacteria. These findings contribute to our understanding of the physiological responses of nitrifiers to short-term light irradiation and have implications for the development of sustainable wastewater treatment technologies.
Article
Biotechnology & Applied Microbiology
Georgios Manthos, Leila Abbaszadeh, Dimitris Zagklis, Michael Kornaros
Summary: In this study, a comprehensive mathematical model was developed to describe the nitrification process in mixed cultures involving isolated NOB and starved AOB, allowing for a more accurate representation of the biological dynamics during starvation conditions. The accuracy of the model was confirmed by testing its predictions against experimental data. This model provides insights into the intricate mechanisms underlying nitrification, contributing to the advancement of sustainable wastewater treatment practices.
FERMENTATION-BASEL
(2023)
Article
Agricultural Engineering
Hao Jiang, Pei Yang, Zhong Wang, Shang Ren, Jingang Qiu, Haoran Liang, Yongzhen Peng, Xiyao Li, Qiong Zhang
Summary: A partial nitrification sequencing batch reactor was operated to investigate NOB acclimatization in high-ammonia wastewater treatment. Findings showed that NOB adapted to a range of free ammonia concentrations by shifting dominant NOB genus from Nitrospira to Nitrolencea. Additionally, hydroxylamine addition could serve as an emergency measure to alleviate NOB acclimatization during short-term operation.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agricultural Engineering
Yubo Cao, Xuan Wang, Xinyuan Zhang, Tom Misselbrook, Zhaohai Bai, Lin Ma
Summary: This study successfully differentiated N2O production pathways using various methods and found that bioelectrochemical assistance applying an electric potential can effectively reduce N2O emissions, with the underlying mitigation mechanism being ammonia oxidation repression.
BIORESOURCE TECHNOLOGY
(2021)
Article
Biotechnology & Applied Microbiology
Muhammad Sohail, Aafaq Ur Rehman, Eldon R. Rene, Shishir Kumar Behera, Hung-Suck Park
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2020)
Article
Green & Sustainable Science & Technology
Izhar Hussain Shah, Liang Dong, Hung-Suck Park
JOURNAL OF CLEANER PRODUCTION
(2020)
Article
Energy & Fuels
Yousuf Jamal, Izhar Hussain Shah, Hung-Suck Park
Summary: This study investigates the extraction and esterification of lipids from wastewater sludge using a mixture of polar and non-polar solvents and acidic catalyst. The results show that the solvent extraction time, catalyst concentration, and esterification reaction time have significant effects on the ester yield.
Article
Green & Sustainable Science & Technology
Gideon Nkam Taka, Ta Thi Huong, Izhar Hussain Shah, Hung-Suck Park
Article
Engineering, Environmental
Sangchul Park, Qammer Zaib, Hung-Suck Park
Summary: The study revealed that humidity has the greatest impact on the total calorific value of low grade coal, followed by temperature. By optimizing environmental conditions, the GCV of the coal can approach 6,000 kcal/kg, which helps resolve disputes between buyers and sellers regarding the variability in GCV.
ENVIRONMENTAL ENGINEERING RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Izhar Hussain Shah, Liang Dong, Hung-Suck Park
JOURNAL OF CLEANER PRODUCTION
(2020)
Article
Environmental Sciences
Ta Thi Huong, Izhar Hussain Shah, Hung-Suck Park
Summary: This study analyzed the key drivers of CO(2) emissions in Vietnam from 1990 to 2016, showing that rising affluence and changing fuel mix were the main driving forces, while energy intensity was the only negative driver resulting in a slowdown of carbon emissions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Izhar Hussain Shah, Hung-Suck Park
Summary: This study examines material use and CO2 emission patterns in Pakistan and analyzes efficiency improvements at the national and multi-country levels. Results indicate that there is room for improvement in material and CO2 intensities in Pakistan, with low national-level efficiency. Multi-country analysis reveals a widening efficiency gap between Pakistan and developed export countries.
JOURNAL OF INDUSTRIAL ECOLOGY
(2021)
Article
Environmental Sciences
Kyeong Ho Kim, Min A. Bae, Man Sig Lee, Hung-Suck Park, Jae Ho Baek
Summary: The study recycled waste sands using inorganic binders and found that they are valuable in casting processes, but caution is needed when reusing powder in casting sands.
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
(2021)
Article
Biodiversity Conservation
Keshab Shrestha, Izhar Hussain Shah, Zhe Liu, Hung-Suck Park
Summary: This study introduces a modified physical quantity method (MPQM) to address methodological issues in emergy assessment in co-production systems, showing that MPQM provides more accurate results compared to other emergy accounting methods. However, inefficiency was found in Eucalyptus pulp production using the MPQM approach. These findings are expected to enhance the methodological aspects of emergy accounting based on the physical quantity criterion.
ECOLOGICAL INDICATORS
(2021)
Article
Multidisciplinary Sciences
Qammer Zaib, Hung Suck Park, Daeseung Kyung
Summary: The study demonstrates the effective reduction of toxic Cr(VI) to less toxic Cr(III) using ascorbic acid, with optimization of dosage achieving >=99% reduction in solutions with different initial Cr(VI) concentrations. Reaction kinetics indicate that >=99.9% of Cr(VI) can be reduced in 20 minutes, highlighting the potential of this method for treating Cr(VI) contaminated water.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Environmental
Daye Lee, Junbeum Kim, Hung-Suck Park
Summary: This study analysed the generation characteristics of industrial hazardous waste in South Korea from 2008 to 2018 and found that factors such as industrial output and characteristics of hazardous waste generation-to-energy are major driving factors influencing the increase of industrial hazardous waste generation. Meanwhile, industrial structure and energy efficiency affect the decrease of industrial hazardous waste generation in most industries. It was also confirmed that different industries have varying driving factors affecting industrial hazardous waste generation. These results provide insights for the South Korean government to improve and customize hazardous waste management policies.
WASTE MANAGEMENT & RESEARCH
(2022)
Article
Green & Sustainable Science & Technology
Ta-Thi Huong, Liang Dong, Izhar Hussain Shah, Hung-Suck Park
Summary: This study explored the resource productivity and efficiency in Vietnam, revealing a positive correlation between domestic material consumption, GDP per capita, and material intensity. However, Vietnam's resource productivity growth rate is slower compared to Japan and China, indicating the need for further enhancement of technology factor and innovation to improve efficiency.
Article
Engineering, Environmental
Keshab Shrestha, Izhar Hussain Shah, Zhe Liu, Hung -Suck Park
Summary: This study used emergy accounting to analyze the environmental performance and energy pathways of Nepal, and found that Nepal's environmental load and emergy sustainability scores have decreased in recent years. Future projections indicate that Nepal's total energy and non-renewable energy will continue to increase, and the emergy sustainability index may further decline. To improve environmental management, Nepal can take various measures, such as reducing the material trade deficit by increasing domestic material extraction and reducing imports of non-renewable resources, minimizing the use of non-renewable resources, improving soil fertility, and promoting the consumption of renewable resources.
ENVIRONMENTAL ENGINEERING RESEARCH
(2022)
Article
Green & Sustainable Science & Technology
Reinout Heijungs, Yi Yang, Hung-Suck Park
Summary: Why are both A-1 and (I-A)-1 used in life cycle assessment (LCA) matrix computations? In this article, the authors aim to unify the computational structures of the two approaches to achieve greater clarity and consistency.
JOURNAL OF INDUSTRIAL ECOLOGY
(2022)
