Article
Environmental Sciences
Yan Yang, Zheng Kong, Haiyuan Ma, Zhiyu Shao, Xinyue Wang, Yu Shen, Hongxiang Chai
Summary: This study developed a water quality model to predict the dynamics of ammonium and nitrate in a biochar-pyrite amended stormwater biofilter. The model revealed that pyrite-based autotrophic denitrification contributes to nitrate leaching alleviation, and the effect improves with increased drying duration. Nitrate removal efficiency is influenced by design parameters, with pyrite filling rate having a minor effect. Service area ratio and submerged zone depth are key parameters in preventing nitrate leaching.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Environmental Sciences
Wenjie Xu, Minghan Luo, Xinyue Lu, Zhengfang Ye, Taeseop Jeong
Summary: In this study, a lab-scale up-flow immobilized biofilter (I-BF) was developed for simultaneous removal of nitrate and tetracycline (TC) in aquaculture tail water. It was found that the denitrification performance of the I-BF reactor was inhibited at high TC load. The optimal conditions for denitrification and TC removal were a C/N ratio of 5 and a HRT of 8.
Article
Environmental Sciences
Gaigai Li, Jinxing Wang, Dingying Ning, Bingquan Chen, Jia Liu, Deyuan Jin, Wuke Guo, Jidong Liang, Hua Ji
Summary: In this study, anammox biofilter (ABF) was successfully started up by inoculating denitrification sludge at low nitrogen strength at 25 degrees C for the treatment of mainstream wastewater. The ABF achieved high total nitrogen removal efficiency and nitrogen removal rate, meeting the discharge standards.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Jiyong Bian, Yang Liao, Ruiping Liu, Xiaoqiang An, Chengzhi Hu, Huijuan Liu, Jiuhui Qu
Summary: This study investigates the effect of surface engineered carbon nitride on the denitrification capability of denitrifying bacteria. The research finds that carbon nitride modified with cobalt atoms and cyano groups can accelerate the bio-denitrification reaction and prevent the accumulation of harmful intermediates. Metabolomics and metatranscriptomic analysis further reveal the moderate metabolic adaptation and increased intracellular iron level as contributing factors.
Article
Ecology
Joachim Audet, Arnaud Jeglot, Lars Elsgaard, Astrid Ledet Maagaard, Sebastian Reinhold Sorensen, Dominik Zak, Carl Christian Hoffmann
Summary: Woodchip bioreactors are effective tools for mitigating nitrogen pollution in agricultural drainage water by utilizing denitrification to remove nitrate nitrogen. However, variations in nitrogen removal efficiency and nitrous oxide emissions are influenced by hydraulic residence time. Overall, the study showed that all bioreactors effectively removed nitrogen and had low nitrous oxide emissions, especially with hydraulic residence times exceeding 60 hours.
ECOLOGICAL ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Fangyuan Jiang, Yueling Qi, Xianyang Shi
Summary: This study investigated the effects of different carbon sources on the denitrification performance, soluble microbial products (SMPs), and microbial community in lab-scale denitrification biofilters. The results showed that the denitrification efficiency varied with different carbon sources and the components of SMPs had varying effects on denitrification.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Agricultural Engineering
Yanfei Wang, Guangxue Wu, Xiaona Zheng, Wei Mao, Yuntao Guan
Summary: This study applied a pyrite-driven autotrophic denitrification biofilter for simultaneous removal of NH4(+) and NO3- and investigated the factors influencing system performance and analyzed the dominant microbial populations and nitrogen and sulfur metabolism. The results showed that the nitrification/Anammox reaction and pyrite-driven autotrophic denitrification synergistically removed NH4(+) and NO3-.
BIORESOURCE TECHNOLOGY
(2022)
Article
Biotechnology & Applied Microbiology
Xin Liu, Xin Xin, Wenyu Yang, Xinyu Zhang
Summary: This study explores the effect mechanism of micron-scale zero-valent iron (mZVI) on improving nitrogen and phosphorus removal in a pyrite-driven denitrification biofilter. The results show that the addition of mZVI significantly enhances the removal efficiency, promotes reaction kinetics, and stimulates the enrichment of functional bacteria.
BIOPROCESS AND BIOSYSTEMS ENGINEERING
(2023)
Article
Environmental Sciences
Yingying Tang, Tong Li, Yujin Xu, Hongqiang Ren, Hui Huang
Summary: This study investigated the effects of electrical stimulation on conventional denitrification biofilters (DNBFs) treating industrial secondary effluent containing chlorophenols (CPs). The results showed that electrical stimulation significantly improved the removal rates of nitrogen and CPs, but had limited effect on reducing biotoxicity. Electrical stimulation promoted the growth of certain bacteria and further enhanced wastewater treatment performance.
ENVIRONMENTAL RESEARCH
(2023)
Review
Biotechnology & Applied Microbiology
Sanjrani Manzoor Ahmed, Saeeda Rind, Keenjhar Rani
Summary: Nitrogen mitigation is a serious environmental issue globally, and biological denitrification with the addition of the best external carbon source is recommended for wastewater treatment. Wetlands are key sites for denitrification and can be carried out using different methods. This paper reviews the literature to evaluate biological denitrification and demonstrates cost-effective external carbon sources. The results show that carbon source is the main contributor and booster for denitrification, and it is concluded that biological denitrification with the addition of an external carbon source is a cost-effective and best option for nitrogen mitigation in a changing world. Textile waste is recommended for the recovery of carbon source based on the literature reviewed.
BIOTECHNOLOGY AND BIOENGINEERING
(2023)
Review
Environmental Sciences
Amina Richa, Sami Touil, Meriem Fizir
Summary: This review introduces tracking tools for nitrate sources in groundwater and discusses methods for nitrate removal. Possible solutions to overcome the limitations of these methods are also proposed.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Parviz Mohammadzadeh, Roghieh Hajiboland
Summary: Nitrate, a common nitrogen fertilizer, can cause water and soil contamination and impact human health and aquatic ecosystems. This study focused on the phytoremediation capacity of two halophyte species, Portulaca oleracea and Salicornia europaea, for nitrate-contaminated water and soils. The results showed that P. oleracea had higher nitrate removal efficiency compared to S. europaea. Selenium and salt treatments enhanced nitrate removal in S. europaea, while salt treatment reduced parameters in P. oleracea. Selenium-assisted phytoremediation is a feasible strategy for both species, but the resulting biomass exceeds the permitted nitrate levels for forage crops, requiring other management strategies.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Aylin Ebru Yenilmez, Selin Ertul, Tulay Yilmaz, Deniz Ucar, Francesco Di Capua, Erkan Sahinkaya
Summary: In this study, the simultaneous removal of PNP and NO3- was investigated under autotrophic and heterotrophic denitrifying conditions. The results showed that autotrophic denitrification with elemental sulfur can efficiently eliminate both PNP and NO3-, even at high concentrations. ORP was identified as a possible control parameter to modulate PNP removal efficiency. Additionally, the autotrophic column showed better resiliency compared to the heterotrophic one.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Biotechnology & Applied Microbiology
Chen Chen, Hui Han, Ya Meng, Haiqing Gong, Rui Jia, Ting Xu, Guo-Chun Ding, Ji Li
Summary: The study found that carbon amendment in greenhouse soils can significantly reduce nitrate leaching, increase nitrogen content in the subsoil, and enrich specific bacterial genera. Carbon amendment may achieve these effects by activating denitrifying and anaerobic bacterial populations.
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
(2021)
Article
Environmental Sciences
Na Li, Yong Li, Ruitao Lou, Hong Xu, Laraib Saeed
Summary: This study analyzed the effects of Fe(II) and organic carbon on nitrate reduction processes in lake sediments. The results showed that Fe(II) greatly promoted nitrate reduction at high temperatures, while the reduction rate decreased at low temperatures. The presence of organic carbon in sediments also influenced the nitrate reduction processes. Overall, the combination of Fe(II) and organic carbon played a significant role in nitrate reduction and nitrogen removal in lake systems.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Agricultural Engineering
Christine Lepine, Laura Christianson, Gregory McIsaac, Steven Summerfelt
AQUACULTURAL ENGINEERING
(2020)
Article
Environmental Sciences
G. Ezzati, O. Fenton, M. G. Healy, L. Christianson, G. W. Feyereisen, S. Thornton, Q. Chen, B. Fan, J. Ding, K. Daly
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2020)
Article
Environmental Sciences
Shiyang Li, Rabin Bhattarai, Richard A. Cooke, Siddhartha Verma, Xiangfeng Huang, Momcilo Markus, Laura Christianson
ENVIRONMENTAL POLLUTION
(2020)
Article
Soil Science
Giovani Preza-Fontes, Emerson D. Nafziger, Laura E. Christianson, Cameron M. Pittelkow
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
(2020)
Article
Agricultural Engineering
Christine Lepine, Laura Christianson, David Soucek, Gregory McIsaac, Steven Summerfelt
Summary: The denitrifying woodchip bioreactor is capable of remediating nitrate-rich water, but may leach detrimental woodbound contaminants which could affect the reuse of outflow water. Outflow water quality from two different hardwood species showed minor differences, with concentrations of total ammonia nitrogen and tannins-lignin being influenced by operational phases.
AQUACULTURAL ENGINEERING
(2021)
Article
Environmental Sciences
Bryan M. Maxwell, Francois Birgand, Louis A. Schipper, Greg Barkle, Aldrin A. Rivas, Matthew J. Helmers, Laura E. Christianson
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2020)
Article
Engineering, Environmental
G. Ezzati, M. G. Healy, L. Christianson, K. Daly, O. Fenton, G. Feyereisen, S. Thornton, O. Callery
JOURNAL OF WATER PROCESS ENGINEERING
(2020)
Article
Ecology
Hannah Dougherty, Richard A. C. Cooke, Rabin Bhattarai, Laura Christianson
ECOLOGICAL ENGINEERING
(2020)
Article
Environmental Sciences
Chengjin Ma, Laura Christianson, Xiangfeng Huang, Reid Christianson, Richard A. Cooke, Rabin Bhattarai, Shiyang Li
Summary: The study found that the heated tourmaline treatment in woodchip bioreactors can effectively reduce clogging and optimize nitrate removal efficiency. Temperature was identified as the key factor impacting the tourmaline treatment, with heated tourmaline treatment showing the lowest biofilm growth and higher abundance of denitrifying bacteria for increased denitrification efficiency.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Niranga M. Wickramarathne, Laura E. Christianson, Mary E. Foltz, Julie L. Zilles, Reid D. Christianson, Richard A. C. Cooke
Summary: Ash and oak tree species can be used as carbon sources for denitrifying bioreactors, but their effectiveness varies. The study found that EAB-killed ash wood performed similarly to commercially available hardwood chips in nitrate removal, but was not as effective as oak wood chips.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2021)
Article
Environmental Sciences
Ana Paula Sanchez Bustamante-Bailon, Andrew Margenot, Richard A. C. Cooke, Laura E. Christianson
Summary: Denitrifying woodchip bioreactors are effective in removing nitrogen, but their potential for phosphorus removal is influenced by the aluminum and iron content in the woodchips, as well as factors like water matrix and particle size. While woodchip bioreactors may contribute to dissolved phosphorus removal, the mechanisms involved are likely diverse, including chemical sorption and particle purification.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Giovani Preza-Fontes, Cameron M. Pittelkow, Kristin D. Greer, Rabin Bhattarai, Laura E. Christianson
Summary: Combining split-N application with cover crops shows promise in reducing nitrate-N losses without negatively impacting crop productivity, thus potentially meeting the statewide interim milestone NO3-N reduction target of 15% by 2025.
JOURNAL OF ENVIRONMENTAL QUALITY
(2021)
Article
Agricultural Engineering
N. M. Wickramarathne, R. A. Cooke, R. Book, L. E. Christianson
TRANSACTIONS OF THE ASABE
(2020)
Article
Agricultural Engineering
L. Christianson, G. Feyereisen, C. Hay, U. Tschirner, K. Kult, N. Wickramarathne, N. Hoover, M. Soupir
TRANSACTIONS OF THE ASABE
(2020)
Article
Agricultural Engineering
L. E. Christianson, R. A. Cooke, C. H. Hay, M. J. Helmers, G. W. Feyereisen, A. Z. Ranaivoson, J. T. McMaine, R. McDaniel, T. R. Rosen, W. T. Pluer, L. A. Schipper, H. Dougherty, R. J. Robinson, I. A. Layden, S. M. Irvine-Brown, F. Manca, K. Dhaese, V Nelissen, M. von Ahnen
Summary: Denitrifying bioreactors enhance natural denitrification processes practically, treating nitrate-nitrogen in various water sources. They follow USDA-NRCS Conservation Practice Standard 605 in the U.S. and have shown consistent nitrate-N removal efficiencies worldwide, with reported removal rates of around 46%, and installation costs ranging from under $5,000 to $27,000. Monitoring setup and reporting measures are recommended for assessing bioreactor performance.
TRANSACTIONS OF THE ASABE
(2021)