Article
Engineering, Environmental
Lin-Lan Zhuang, Mengting Li, Yingfei Li, Lijie Zhang, Xiaoli Xu, Haiming Wu, Shuang Liang, Chang Su, Jian Zhang
Summary: Biochar is considered as black gold in the field of environmental remediation, due to its high surface area, light density, and great adsorption capacity. It has high potential to improve wastewater purification in constructed wetlands. This paper systematically reviews the characteristics of biochar, methods of preparation, pollutant removal effects, and greenhouse gas emission reduction in constructed wetlands, providing guidance for further studies on biochar application. The study found that biochar produced from terrestrial plants was mainly used in constructed wetlands, while biochar produced from marine biology or other procedures may have different performance. Biochar affects the performance of constructed wetlands through multiple pathways, including physicochemical and hydraulic conditions, as well as biological behavior. The enhancement of pollutant removal in biochar-added constructed wetlands was quantified, with significantly higher removal rates for COD, ammonia, and TN compared to non-biochar wetlands. Moreover, biochar commonly reduces N2O emissions from constructed wetlands, although the mechanism behind this is still not fully understood. Further research is needed to advance our understanding of biochar's behavior in constructed wetlands for wastewater treatment.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Engineering, Environmental
Yamei Cai, Yaqian Zhao, Ting Wei, Wei Fu, Cheng Tang, Yujie Yuan, Qi Yin, Cong Wang
Summary: This review explores how to make use of constructed wetlands (CWs) technology in sponge city construction under carbon neutral vision. By comparing the characteristics of CWs with the policy measures of sponge city technology and the carbon emission reduction, different roles of CWs combinations in sponge city construction were discussed. Strategies and technical measures were proposed to achieve the "double carbon" target in future sponge city construction.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Review
Engineering, Environmental
Shentan Liu, Yangchen Zhang, Xiaojuan Feng, Sang-Hyun Pyo
Summary: This paper summarizes the common problems of constructed wetlands (CWs) and proposes corresponding optimized solutions, including thermal insulation and additional aeration in cold climates, choosing suitable plant species and planting patterns to enhance phytoremediation in CWs, using various methods to monitor and evaluate CW clogging, implementing anti-clogging measures, controlling greenhouse gas emissions during CW treatment, constructing and utilizing CW databases, designing appropriate CW types, and implementing strict technical management and supervision.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Environmental Sciences
Guosheng Zhang, Qingju Hao, Rongzhen Ma, Shixu Luo, Keqin Chen, Zhenghao Liang, Changsheng Jiang
Summary: Constructed wetlands (CWs) with biochar and hematite as substrates enhanced pollutant removal and reduced greenhouse gas emissions. The biochar-amended CWs achieved high removal efficiencies of COD and TN, and significantly lowered CH4 and N2O fluxes. The application of biochar and hematite also decreased the global warming potentials (GWP) and modified microbial communities, promoting denitrifying bacteria abundance. This study highlights the potential of biochar and the combined use of biochar and hematite as functional substrates for efficient pollutant removal and reduction of GWP emissions in CWs.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Multidisciplinary Sciences
James L. France, Rebecca E. Fisher, David Lowry, Grant Allen, Marcos F. Andrade, Stephane J-B Bauguitte, Keith Bower, Timothy J. Broderick, Michael C. Daly, Grant Forster, Mangaliso Gondwe, Carole Helfter, Alison M. Hoyt, Anna E. Jones, Mathias Lanoiselle, Isabel Moreno, Peter B. R. Nisbet-Jones, David Oram, Dominika Pasternak, Joseph R. Pitt, Ute Skiba, Mark Stephens, Shona E. Wilde, Euan G. Nisbet
Summary: The rising atmospheric methane burden and the uncertainty surrounding its causes are the focus of this study. The researchers present a collection of new delta C-13(CH4) signatures for tropical wetlands and rice fields, which provide insights into isotopic variation and potential seasonal shifts. Long-term monitoring at two observatories in Bolivia and Botswana shows that biogenic methane sources, particularly wetlands, dominate the records. The findings suggest significant seasonal variation in tropical wetland delta C-13(CH4) signatures, highlighting the need to incorporate this variability into future global and regional models.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2022)
Article
Chemistry, Physical
Shentan Liu, Hongpu Xue, Mixue Wang, Xiaojuan Feng, Hyung-Sool Lee
Summary: This study evaluates the use of constructed wetland-microbial fuel cells (CW-MFC) as a sustainable solution for reducing greenhouse gas (GHG) emissions. The results show that carbon fiber felt (CFF) exhibits the lowest methane and nitrous oxide emissions among the selected cathode materials. Adjusting the influent pH from acidic to alkaline also reduces GHG emissions. However, the addition of nickel inhibits GHG emissions but decreases electricity generation. Additionally, a low carbon-to-nitrogen ratio reduces methane emissions, while a high ratio effectively inhibits nitrous oxide emissions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Environmental
Likui Feng, Shufei He, Hang Yu, Jian Zhang, Zizhang Guo, Liangliang Wei, Haiming Wu
Summary: This study investigated the role of wetland plants in the treatment of wastewater in constructed wetlands, finding that girdling plants led to a decrease in O-2 release and an increase in greenhouse gas emissions.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Hui Zhu, Tingting Niu, Brian Shutes, Xinyi Wang, Chunguang He, Shengnan Hou
Summary: The combination of microbial fuel cells (MFCs) with constructed wetlands (CWs) has been found to enhance water purification efficiency and reduce gas emissions. Compared to batch-fed wetland systems (BF CWs), MFC-CWs showed higher pollutant removal efficiency and lower global warming potential (GWP). The reduced gas emissions in MFC-CWs were related to specific genes, and the integration of MFC also promoted microbial diversity.
Article
Soil Science
Xiaoxuan Chen, Martin Wiesmeier, Jordi Sardans, Lukas Van Zwieten, Yunying Fang, Albert Gargallo-Garriga, Youyang Chen, Shuyun Chen, Congsheng Zeng, Josep Penuelas, Weiqi Wang
Summary: The presence of crabs increases greenhouse gas emissions (CO2, CH4, and N2O) and soil C, N, and P concentrations in wetlands. Additionally, it enhances the global warming potential (GWP) of the wetlands.
BIOLOGY AND FERTILITY OF SOILS
(2021)
Article
Environmental Sciences
Agnes Grossel, Hocine Bourennane, Adeline Ayzac, Catherine Pasquier, Catherine Henault
Summary: Nitrous oxide (N2O) is an important greenhouse gas with increasing atmospheric concentrations due to industrialization and nitrogen fertilizer use. It is found that the contribution of freshwater systems to N2O emissions is uncertain, and the regional differences in N2O concentrations in rivers are influenced by local hydrology. The study in the Haut-Loir watershed in France showed significant variations in dissolved N2O concentrations between eastern and western rivers, suggesting that spatial variability of riverine N2O depends on local hydrology. The research also highlights the need for further studies to understand the seasonal variability of N2O emissions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Review
Green & Sustainable Science & Technology
Marte Nikolaisen, Thomas Cornulier, Jonathan Hillier, Pete Smith, Fabrizio Albanito, Dali Nayak
Summary: We conducted a quantitative review on methane (CH4) emission from rice paddies using peer-review articles. We developed a generalized additive model (GAM) to estimate emission factors (EFs) and found that emissions were influenced by water regime, soil texture, and organic amendment practices. The new model outperformed existing models, showing higher R2 values and providing accurate baseline EF calculations for different rice regions.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Environmental Sciences
Zutao Ouyang, Robert B. Jackson, Gavin McNicol, Etienne Fluet-Chouinard, Benjamin R. K. Runkle, Dario Papale, Sara H. Knox, Sarah Cooley, Kyle B. Delwiche, Sarah Feron, Jeremy Andrew Irvin, Avni Malhotra, Muhammad Muddasir, Simone Sabbatini, Ma Carmelita R. Alberto, Alessandro Cescatti, Chi-Ling Chen, Jinwei Dong, Bryant N. Fong, Haiqiang Guo, Lu Hao, Hiroki Iwata, Qingyu Jia, Weimin Ju, Minseok Kang, Hong Li, Joon Kim, Michele L. Reba, Amaresh Kumar Nayak, Debora Regina Roberti, Youngryel Ryu, Chinmaya Kumar Swain, Benjei Tsuang, Xiangming Xiao, Wenping Yuan, Geli Zhang, Yongguang Zhang
Summary: Although rice cultivation is a significant source of methane emissions, there are large discrepancies in the estimated global emissions due to a lack of observational data. This study used machine learning and remote sensing data to estimate high-resolution methane emissions from paddy rice in Monsoon Asia and found a declining trend in emissions in recent years.
REMOTE SENSING OF ENVIRONMENT
(2023)
Article
Environmental Sciences
Phuong Minh Nguyen, Muhammad Arslan, Uwe Kappelmeyer, Ines Mausezahl, Arndt Wiessner, Jochen A. Mueller
Summary: This study shows the structural organization of microbial transformation of inorganic sulfur compounds (ISCs) in constructed wetlands. The fully planted wetland exhibits higher sulfur cycling activity, which is related to the differences in bacterial communities between the roots and porewater.
Article
Environmental Sciences
Dayang Yu, Jinjia Niu, Longchun Zhong, Kaiyu Chen, Guanyi Wang, Meilin Yan, Dandan Li, Zhiliang Yao
Summary: China, as one of the largest carbon emitters, aims to achieve carbon neutrality by 2060. This study focuses on the utilization of waste and pollution reduction in the food chain, particularly through the conversion of waste into biochar. It provides a systematic review and analysis of the sources of biochar in the food chain, as well as the feasibility of treating contaminated sites within the food chain using waste.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Ulo Mander, Julien Tournebize, Mikk Espenberg, Cedric Chaumont, Raili Torga, Josette Garnier, Mart Muhel, Martin Maddison, Jeremie D. Lebrun, Emmanuelle Uher, Kalle Remm, Jaan Parn, Kaido Soosaar
Summary: Constructed wetlands can efficiently remove nitrogen from polluted agricultural run-off, but may produce nitrous oxide (N2O) emissions. This study showed seasonal variations in N2O fluxes in a off-stream CW treating nitrate-rich water, with a strong positive correlation to inlet NO3- concentrations and streamflow. Results indicate complete denitrification with only 9% of potential N2O formation emitted to the atmosphere.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Yiwen Zhou, Shuting Zhao, Toshikazu Suenaga, Megumi Kuroiwa, Shohei Riya, Akihiko Terada
Summary: This study evaluated the physiologies of two N2O-reducing bacteria, showing their potential as N2O sinks in the presence of NO2- and N2O. The activities of these N2ORB were significantly affected by high NO2- concentrations and acidic conditions, increasing the risk of N2O emissions.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Chuang Qi, Yiwen Zhou, Toshikazu Suenaga, Kohei Oba, Jilai Lu, Guoxiang Wang, Limin Zhang, Sukhwan Yoon, Akihiko Terada
Summary: Choosing appropriate electron donor additives is important for increasing the N2O sink capability of biological nitrogen removal systems. Different organic carbon sources have different effects on the activity of N2O-reducing bacteria, with acetate and succinate being the preferred organic carbon sources.
Article
Biotechnology & Applied Microbiology
Masumi Kobayashi, Ryosei Agari, Yunje Kigo, Akihiko Terada
Summary: A composite membrane with high oxygen permeability and low vapor permeability was developed for a membrane-aerated biofilm reactor (MABR), providing effective oxygen supply and high carbon removal rate. The PS composite membrane showed better performance in oxygen transfer and biofilm formation compared to the PU composite membrane, leading to superior operation of the MABR.
BIOCHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
S. Zhao, A. Terada, K. Nakamura, M. Nakashima, T. Komai, S. Riya, M. Hosomi, H. Hou
Summary: The study revealed that soil moisture and temperature significantly influence Hg emission and Hg fractions, with Hg flux increasing with higher temperature and soil moisture. Soil moisture impacts Hg fractions, and the relationship between activation energy values and soil moisture varies across different soils.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Biotechnology & Applied Microbiology
Jingyu Duan, Hop Van Phan, Hiroki Tsukamoto, Tomoyuki Hori, Akihiko Terada
Summary: Shifting from conventional ammonia removal to recovery is crucial for addressing environmental problems and resource scarcity. A study on a microaerophilic activated sludge (MAS) system showed that it has the potential to efficiently remove chemical oxygen demand (COD) while retaining ammonia. The biokinetic analysis and mathematical modeling revealed the optimal operating conditions for achieving high COD removal efficiencies, ammonia retention efficiencies, and low N2O emission factors in the MAS system.
BIOCHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Muchun Zhou, Chuanqiao Zhou, Yu Peng, Ruoyu Jia, Wenpeng Zhao, Shuoyuan Liang, Xiaoguang Xu, Akihiko Terada, Guoxiang Wang
Summary: Lacustrine eutrophication, a major contributor to carbon emissions, poses challenges in accurately estimating carbon emissions from lakes. This study used a space-for-time substitution approach to examine carbon emissions from eight lakes and Lake Taihu over one year. The results showed that eutrophication promoted carbon production potential, dissolved carbon concentrations, and carbon release fluxes, particularly CH4. However, the space-for-time substitution method led to an overestimation of the impact of eutrophication on carbon emissions, especially with the intensification of eutrophication.
ENVIRONMENTAL RESEARCH
(2023)
Review
Environmental Sciences
Shuting Zhao, Taoran Shi, Akihiko Terada, Shohei Riya
Summary: The first global-scale assessment of Sb contamination in soil related to mining/smelting activities was conducted based on 91 articles published between 1989 and 2021. The study analyzed the geographic variation, pollution levels, speciation, influencing factors, and environmental effects of Sb in mining/smelting-affected soils. High Sb values were found in both developed (Poland, Italy, Spain, Portugal, New Zealand, Australia) and developing (China, Algeria, Slovakia) countries. Most mining areas reported soil Sb concentrations that exceeded WHO's recommended maximum permissible limit. The study highlights the importance of standardizing extraction methods for Sb speciation and the potential non-carcinogenic health risks from Sb ingestion through crop consumption.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2023)
Article
Engineering, Environmental
Hiroki Tsukamoto, Hop V. Phan, Toshikazu Suenaga, Shohei Yasuda, Megumi Kuroiwa, Shohei Riya, Atsushi Ogata, Tomoyuki Hori, Akihiko Terada
Summary: This study validated a microaerophilic activated sludge system for efficient ammonia retention and organic carbon removal from nitrogenous wastewater. The system controlled dissolved oxygen concentrations and solids retention times to mitigate N2O emissions and suppress ammonia-oxidizing microorganisms, achieving successful nitrogen management.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Chemical
Jizhong Meng, Lin Shi, Shun Wang, Zhenhu Hu, Akihiko Terada, Xinmin Zhan
Summary: Electrodialysis (ED) is a potential technique for nutrient recovery from digestate, but fouling caused by dissolved organic matter (DOM) remains a challenge. This study investigated the effect of molecular size on DOM fouling in ED membranes using an ultrafiltration-ED design. It was found that the fouling of anion-exchange membranes was significantly influenced by molecular size, while the cation-exchange membranes were antifouling. DOM with a molecular size smaller than 10 kDa caused the most significant deterioration of the anion-exchange membrane.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Environmental Sciences
Chuanqiao Zhou, Muchun Zhou, Ruoyu Jia, Yu Peng, Fenjun Zhao, Runze Xu, Shuoyuan Liang, Akihiko Terada, Guoxiang Wang, Tsuyoshi Kinouchi, Xiaoguang Xu
Summary: Lakes play an important role in methane emissions and particulate organic carbon (POC) production, known as the methane paradox. However, the source of POC during eutrophication and its impact on methane emissions are still unclear. This study investigated 18 shallow lakes with different trophic states to understand the source of POC and its contribution to methane production. The findings suggest that cyanobacteria-derived carbon is a significant source of POC, and the intensified eutrophication increases POC concentration, promoting methane production and emission fluxes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Yang Bai, Huanhuan Hu, Po-Heng Lee, Ainur Zhussupbekova, Igor Shvets, Bang Du, Akihiko Terada, Xinmin Zhan
Summary: Iron sulfides-based autotrophic denitrification (IAD) can effectively treat nitrate-contaminated wastewater. This study reveals the chemical reduction of nitrate to ammonium by iron sulfides under ambient conditions, which has been overlooked in IAD reactors. The biofilter of IAD system showed complex nitrogen transformations involving chemical reduction, autotrophic denitrification, dissimilatory nitrate reduction to ammonium (DNRA), and sulfate reducing ammonium oxidation (Sulfammox), facilitated by functional microbial communities.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Xinyi Zhou, Taku Fujiwara, Taira Hidaka, Fumitake Nishimura, Tomohiro Nakanishi, Akihiko Terada, Tomoyuki Hori
Summary: In this study, a microaerobic activated sludge process (MAS) was proposed as a pretreatment method to retain NH4-N from high-strength nitrogenous wastewater. The MAS systems achieved high NH4-N retention rates and TOC removal rates. The emissions of CO2 and N2O during MAS were evaluated, and the mechanisms of N2O emission from each reactor were investigated. The study highlighted the importance of N2O mitigation in the MAS process, especially under acidic conditions.
Article
Microbiology
Shohei Yasuda, Akihiko Terada
Summary: This article describes the complete genome sequence of a Gamma-proteobacteria marine bacterium D49 isolated from activated sludge treating landfill leachate, which contains functional genes for the biosynthesis of ectoine. The deciphering of the genome contributes to ectoine production by this strain.
MICROBIOLOGY RESOURCE ANNOUNCEMENTS
(2023)
Article
Engineering, Environmental
Kohei Oba, Toshikazu Suenaga, Megumi Kuroiwa, Shohei Riya, Akihiko Terada
Summary: In denitrifying reactors, different canonical complete denitrifying bacteria show variations in NO3- and N2O consumption rates. The Clade II nosZ bacterium Azospira sp. strain I13 acts as an N2O sink, while the Clade I nosZ bacteria Pseudomonas stutzeri strain JCM 5965 and Alicycliphilus denitrificans strain I51 exert an effect on NO3-. These findings are valuable for developing N2O mitigation strategies.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Biotechnology & Applied Microbiology
Mamoru Oshiki, Yuka Toyama, Toshikazu Suenaga, Akihiko Terada, Yasuhiro Kasahara, Takashi Yamaguchi, Nobuo Araki
Summary: Agricultural soil plays a crucial role in mitigating the emission of N2O gas, and this study examined the N2O reduction activities of Gemmatimonadetes bacteria and their abundance in agricultural soil samples. The results showed that the Gemmatimonas aurantiaca bacteria exhibited the highest N2O reduction activity at pH 7 and 30°C. Additionally, the abundance of Gemmatimonadetes bacteria and specific OTUs correlated with the N2O reduction rates in the soil samples, suggesting their involvement in N2O reduction.
MICROBES AND ENVIRONMENTS
(2022)
