Review
Engineering, Environmental
John Kabuba, Joseph Lephallo, Hilary Rutto
Summary: This article reviews different methods for nitrogen removal from wastewater and recommends the combination of multiple methods to achieve effective and economical wastewater treatment.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Ausra Mazeikiene, Julita Sarko
Summary: After biological wastewater treatment, ammonium nitrogen, nitrate nitrogen, and phosphate phosphorus still remain in the effluent. By using selected materials as filter media, these wastewater compounds can be further removed. The tested materials are effective in treating nitrogen and phosphorus in wastewater without causing pollution.
Article
Engineering, Environmental
Xia Liu, Yun Li, Ruijie Shen, Min Zhang, Feizhou Chen
Summary: The response of diatoms to reduced nitrogen and high phosphorus concentration in a eutrophic lake was studied. The results showed that the growth of diatoms was more sensitive to nitrogen reduction, and their response to nitrogen changed with water temperature.
Article
Soil Science
Wenting Jiang, Haikuo Zhang, Yunying Fang, Youchao Chen, Shoujia Zhuo, Zhihao Chen, Chenfei Liang, Lukas Van Zwieten, Shenglei Fu, Yongfu Li, Bing Yu, Yanjiang Cai, Scott X. Chang
Summary: Deposition of atmospheric nitrogen increases soil nitrous oxide emissions, and the commonly used understory nitrogen application methods underestimate the actual impacts due to overlooking nitrogen interception by forest canopies. Our study compared different nitrogen deposition simulation approaches and forms of nitrogen in a Moso bamboo forest, and found that the cumulative nitrous oxide emissions were higher in understory nitrogen application treatments compared to canopy treatments, with greater emissions under inorganic nitrogen application. Considering canopy processes is important for future studies on nitrogen deposition and soil nitrous oxide emissions.
Article
Soil Science
Bo Zhou, Yiyong Chen, Chi Zhang, Jianlong Li, Hao Tang, Jiayu Liu, Jun Dai, Jinchi Tang
Summary: Vermicomposting is an efficient and environmentally friendly technology for disposing of agricultural organic residues. The study investigated the responses of earthworm biomass and population structure to changes in the physicochemical properties of six types of organic residues during vermicomposting. It was found that earthworm activity varied among different types of organic residues, with the substrate C/N ratio negatively affecting earthworm growth dynamics. Regular monitoring of the chemical properties of vermicomposting systems is recommended to sustain active earthworm populations.
Article
Agronomy
Sebastian Kusmierz, Monika Skowronska, Przemyslaw Tkaczyk, Wojciech Lipinski, Jacek Mielniczuk
Summary: Over the past few decades, the importance of soil organic carbon (SOC) and mineral nitrogen (N-min) in agroecosystems, particularly nitrates (NO3-), has been widely recognized due to their crucial roles in soil fertility, crop productivity, environmental quality, and/or climate change mitigation and adaptation. In this study conducted in Polish arable lands, the contents of organic carbon, ammonium, and nitrate in soils were evaluated according to different pH levels, texture, and fertilization rates. The results indicated that soil pH and texture, as well as mineral and organic fertilization, significantly influenced SOC content, while the same factors, except organic amendments, significantly affected mineral nitrogen concentration.
Article
Agronomy
Antonio Carlos de Oliveira Junior, Leonardo Nazario Silva dos Santos, Mateus Neri Oliveira Reis, Luciana Cristina Vitorino, Layara Alexandre Bessa, Marconi Batista Teixeira, Frederico Antonio Loureiro Soares
Summary: In this study, it was found that chicken litter as an organic nitrogen source is equally efficient in promoting the growth and yield of sugarcane as mineral nitrogen. The study also highlighted the superior performance of the IACSP95-5094 cultivar in terms of growth and yield during the ratoon crop season.
Article
Environmental Sciences
Young-Jae Jeong, Bo-Seong Seo, Nuri Baek, Jin-Hyeob Kwak, Sang-Mo Lee, Hyun-Jin Park, Woo-Jung Choi
Summary: This study proposed methods for determining the δN-15 of multiple nitrogen species. The methods included traditional distillation, direct evaporation, and isotope mass balance equation. The accuracy and precision of the methods were evaluated through a series of experiments, and the influences of different conditions on the analysis results were assessed.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Review
Astronomy & Astrophysics
Katye E. Altieri, Sarah E. Fawcett, Meredith G. Hastings
Summary: The budget of reactive nitrogen has doubled since the preindustrial era due to human activities, causing detrimental effects on ecosystems. The impact of excess nitrogen on the open ocean is not well understood. It is challenging to trace the origin of nitrogen deposition in the ocean.
ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES, VOL 49, 2021
(2021)
Article
Agricultural Economics & Policy
Maximilian Koppenberg
Summary: A competitive environment and concentrated sectors lead farmers to seek alternative ways to improve their position in negotiations with downstream companies. This article examines the impact of organic agriculture on farmers' bargaining power and the role of concentration in downstream industries. Using a dataset of over 200,000 observations from around 40,000 dairy farms, the study finds that organic farmers achieve higher markups compared to conventional farmers. Market shares of organic milk do not affect markups of organic farmers, but market shares of medium-sized and large processors do. The presence of multinational retail chains has a negative impact on farmers' markups.
AGRICULTURAL ECONOMICS
(2023)
Article
Agronomy
Shaobo Wang, Puyu Feng, William D. Batchelor, Kelin Hu, Ji Li
Summary: Organic farming is considered sustainable for greenhouse vegetable production, but excessive use of organic manure can lead to high DON leaching. This study compared DIN and DON leaching under different farming systems, showing that organic systems had lower DIN leaching but higher DON leaching compared to conventional and integrated systems. Management strategies should be optimized to minimize DON leaching in organic farming.
Article
Biochemistry & Molecular Biology
Ruimiao Qin, Yahui Zhang, Shijie Ren, Pengcheng Nie
Summary: This study utilized Raman spectroscopy to detect soil-available nitrogen concentrations and established quantitative models using multiple linear regression and machine learning algorithms. The results demonstrated that Raman spectroscopy with silver nanoparticles exhibited higher sensitivity, and the particle swarm optimization least squares support vector machine (PSO-LSSVM) model achieved the best accuracy and stability.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Agricultural Engineering
Aiping Tang, Qingyao Wang, Huiqin Wan, Shitian Kang, Shuixia Xie, Jiali Chen, Jiali He, Donghui Liang, Anping Huang, Jingxin Shi, Xianxin Luo
Summary: Recovering phosphorus from liquid waste streams through bio-mediated techniques has attracted increasing interest, but current approaches are highly dependent on ammonium. This study developed a process to recover phosphorus from wastewater under multiple nitrogen species conditions. It found that a bacterial consortium could efficiently utilize both ammonium and nitrate to recover phosphorus. The stability of the bacterial community structure was positively influenced by nitrogen loading, with the genus Acinetobacter being dominant under both nitrate and ammonium conditions.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
Yaojin Xiong, Yao Du, Yamin Deng, Teng Ma, Dian Li, Xiaoliang Sun, Guangning Liu, Yanxin Wang
Summary: This study used multiple stable isotopes and spectral characteristics of DOM to investigate the sources and fate of nitrate and ammonium in groundwater in the Central Yangtze River Basin. Different hydrogeological conditions were found to control the behavior of nitrogen compounds in three subareas, leading to contrasting patterns of nitrogen sources and fate.
ENVIRONMENTAL POLLUTION
(2021)
Article
Environmental Sciences
Gongning Chen, Yanhong Du, Liping Fang, Xiangqin Wang, Chuanping Liu, Huanyun Yu, Mi Feng, Xi Chen, Fangbai Li
Summary: This study investigates the effects of different forms of nitrogen fertilizer on the reduction and dissolution of arsenic-bearing iron minerals and microbial-mediated arsenic transformation processes. The results show that nitrate nitrogen fertilizer reduces the bio-availability of arsenic in soil, while ammonium nitrogen fertilizer promotes the release of arsenic into porewater. However, the combined application of nitrate and ammonium nitrogen has no significant effect on arsenic concentration in rice grain and its transformation in paddy soils. These findings provide insights into the rational use of nitrogen fertilizers to reduce the risk of arsenic contamination in rice.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
