Article
Engineering, Environmental
Qiongpeng Dan, Rui Du, Tong Wang, Tiantian Sun, Honggui Han, Xiaorong Zhu, Xiyao Li, Qiong Zhang, Yongzhen Peng
Summary: A hybrid system of anammox combined with heterotrophic endogenous metabolisms was developed in a single-stage bioreactor to treat real domestic wastewater. Nitrogen removal was achieved at a low carbon to nitrogen ratio and maintained under an extremely low ratio. The coexistence and enrichment of different bacteria contributed to the co-metabolism of carbon, nitrogen, and phosphorus.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Zhaolu Feng, Mengqi Gu, Yuepeng Sun, Guangxue Wu
Summary: This study investigated the potential microbial functions in nitrogen conversion and AHLs-based quorum sensing in the PNA process. Key functional bacteria including Candidatus_Kuenenia and Nitrosomonas were identified, and AHLs such as N-octanoyl-L-homoserine lactone were found to be synthesized by nitrogen converting microorganisms and heterotrophs. Heterotrophs were revealed to have the ability to sense and degrade AHLs during information exchange, providing insights for system optimization in the microbial community.
WATER ENVIRONMENT RESEARCH
(2021)
Article
Biotechnology & Applied Microbiology
Xiu Yue, Zinan Xu, Hongying Wu, Zhenyu Zhao, Xiaolin Chen
Summary: This study investigates the effects of adding soluble starch, ethanol, and sodium acetate on the microorganisms and nitrogen removal in the PN/A biofilm system. The results show that ethanol has the strongest effects on AOB growth and ammonium nitrogen removal rate, followed by soluble starch and sodium acetate. However, ethanol also has the most significant impact on the suppression of AnAOB and total nitrogen removal rate. Furthermore, ethanol has the greatest influence on the enrichment of NOB and certain bacterial phyla.
BIOCHEMICAL ENGINEERING JOURNAL
(2023)
Article
Agricultural Engineering
XiaoTong Wang, Hong Yang, JiaWei Wang
Summary: A two-stage partial nitritation/anammox process based on microbial encapsulation (PN/A-E) was established and thoroughly studied. The nitrogen removal efficiency of PN/A-E was compared to anammox granular sludge (AnGS) under high and low ammonia nitrogen conditions, as well as after reactivation from a long-term shutdown. The results showed that PN/A-E had a stable performance even under high ammonia nitrogen, and the nitrite accumulation rate reached 95.2 +/- 0.7%. The total nitrogen removal rate of encapsulated anammox bacteria was twice that of AnGS, and it exhibited better resilience to external interference. PN/A-E also demonstrated good reactivation performance with a final effluent total nitrogen of 10.0 +/- 1.4 mg·L-1 at a hydraulic retention time of 2.18 h. The immobilized fillers facilitated the growth of ammonia-oxidizing bacteria under restricted conditions and promoted the dominance of functional bacteria and stability of microbial community under low ammonia nitrogen. This study provides a positive method for achieving reliable PN/A process.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Xiaojing Zhang, Han Zhang, Nan Zhang, Yongpeng Ma, Nan Liu, Guanglu Han, Qiong Wang
Summary: In this study, the impact of N-dodecanoyl homoserine lactone (C12-HSL) on nitrogen removal, enzyme activity, and microbial community in Anammox system was investigated. Results showed that once-addition of C12-HSL had no obvious impact on Anammox. Daily-addition with different concentrations of C12-HSL slightly improved or decreased the TN removal and enzyme activity. The abundance of certain bacteria showed correlation with TN removal.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Enzhe Yang, Jing Chen, Ziyi Jiang, Zhengyu Deng, Zhi Tu, Hong Wang, Sha Wu, Zhe Kong, Eli Hendrik Sanjaya, Hong Chen
Summary: This study successfully recovered a deteriorated PNA system using a unique recovery strategy and explored the mechanism of recovery. The results showed that high nitrogen loading rate and hydraulic shear force can induce sludge granulation in the reactor, leading to recovery of microbial community structure and rapid restoration of nitrogen removal performance.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Zhixiang Gao, Hu Chen, Ying Wang, Yongkang Lv
Summary: Biological nitrogen removal is the process of converting organic nitrogen and ammonia nitrogen into nitrogen gas, and the quorum sensing system can enhance biological nitrogen removal performance by regulating bacterial behavior.
WATER SCIENCE AND TECHNOLOGY
(2022)
Review
Engineering, Environmental
Peng Wu, Junjiang Chen, Vijay Kumar Garlapati, Xingxing Zhang, Francis Wani Victor Jenario, Xiang Li, Wenru Liu, Chongjun Chen, Tejraj M. Aminabhavi, Xiaonong Zhang
Summary: This study presents a comprehensive review of the anammox process, the advancements in nitritation and denitratation processes, and proposes a novel wastewater treatment method for efficient nitrogen removal.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Agricultural Engineering
Shenhua Yang, Yongzhen Peng, Shujun Zhang, Xiaoyu Han, Jialin Li, Liang Zhang
Summary: This study analyzed and compared the biofilm structure, performance, and nitrogen removal pathways of microporous and macroporous carriers from a full-scale partial nitritation/anammox reactor. Microporous carriers had thicker biofilms, higher biomass, and nitrogen removal efficiency due to the integration of denitrifying and anammox bacteria, while macroporous carriers had thinner biofilms, lower microbial richness, but strong network correlation among genera.
BIORESOURCE TECHNOLOGY
(2021)
Article
Microbiology
Yung-Hsien Shao, Yu-Wei Wu, Muhammad Naufal, Jer-Horng Wu
Summary: In this study, a metagenomic approach was used to analyze the genomic contents of core members in a partial nitritation-anaerobic ammonium oxidation (PN-A) reactor treating low-strength ammonium wastewater. The analysis showed the metabolic traits and predicted microbial interactions of 18 core species, providing new insights into microbial adaptation to the intermittent microaeration specific to the PN-A reactor and its application to low-strength ammonium wastewater.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Engineering, Environmental
Feng Zhou, Wan-Zi Xiao, Kai-Yuan Zhou, Jin-Long Zhuang, Xu Zhang, Yong-Di Liu, Bing-Jie Ni, James P. Shapleigh, Min Zhou, Xi-Zi Luo, Wei Li
Summary: This study developed a novel one-stage nitrogen removal method that integrates partial nitrification, anammox, and denitratation for the treatment of low C/N wastewater. The expression of key genes for nitritation, anammox, and denitratation increased as reactor performance improved. Analysis of the metagenome revealed the dominant genera of ammonium-oxidizing bacteria, anammox bacteria, and denitratation bacteria. Mass balance confirmed that anammox was the dominant nitrogen removal pathway.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Enzhe Yang, Jing Chen, Ke Liu, Jianhong Jiang, Hong Wang, Sha Wu, Lixiu Shi, Jingyi Jiang, Eli Hendrik Sanjaya, Hong Chen
Summary: This study constructed a single-stage partial nitritation-anammox and denitrification system and operated it continuously for 364 days. The system showed efficient and stable operation, with an average total nitrogen removal efficiency of 87.2%. The nitrogen removal pathway in the system changed from autotrophic nitrogen removal to nitrification-denitrification. Overall, the system demonstrated the potential for efficient single-stage nitrogen removal.
Article
Agricultural Engineering
Hong Wang, Chen Chen, Enzhe Yang, Zhi Tu, Jie Liang, Xiaohu Dai, Hong Chen
Summary: This study compared the performance characteristics of PNA systems with and without carriers in treating wastewater. The results showed that both the suspended sludge system and the biofilm system achieved stable nitrogen removal efficiencies. The biofilm system had a longer start-up time but demonstrated stable performance under aeration shock. The suspended sludge system displayed good elasticity for performance recovery. Controlling dissolved oxygen could enhance the activity and abundance of functional microbes.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
Xueming Chen, Jinzhong Liu, Pengfei Huo, Fuyi Li, Linyan Yang, Wei Wei, Bing-Jie Ni
Summary: This study investigated the impacts of key granule properties on the performance of a granular reactor conducting partial nitritation/anammox from a modeling perspective. The findings can provide guidance for reliable modeling as well as practical startup and operation of the reactor.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
S. K. Tellez-Perez, S. Wyffels, H. KleinJan, C. Meunier, R. Gerards
Summary: Partial nitritation-anammox process was successfully conducted in a continuous fed Sequencing Batch Reactor (cf-SBR) to remove nitrogen from anaerobic effluent of the potato industry at different loading rates, with nitrogen removal and ammonia oxidation reaching 62% and 74% respectively at the highest loading rate. The study also observed improvements in sludge characteristics and confirmed the presence of anammox bacteria through molecular analysis. The cf-SBR demonstrated its capability as a suitable and feasible technology for advanced nitrogen removal under partial nitritation and anammox conditions.
Article
Environmental Sciences
Toshimi Nakajima, Mao Kuragano, Makoto Yamada, Ryo Sugimoto
Summary: This study compared the contribution of submarine groundwater discharge (SGD) to river nutrient budgets at nearshore and embayment scales, and found that SGD-derived nutrients become more important at larger spatial scales.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Fan Liu, Lei Zhang, Chongyang Zhang, Ziguang Chen, Jingguang Li
Summary: NO2 emissions from wall-mounted gas stoves used for household heating have become a significant source of indoor pollution in Chinese urban areas. The high indoor concentration of NO2 poses potential health risks to residents. It is urgently necessary to establish relevant regulations and implement emission reduction technologies to reduce NO2 emissions from wall-mounted gas stoves.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Letter
Environmental Sciences
Hans Peter H. Arp, Raoul Wolf, Sarah E. Hale, Sivani Baskaran, Juliane Gluege, Martin Scheringer, Xenia Trier, Ian T. Cousins, Harrie Timmer, Roberta Hofman-Caris, Anna Lennquist, Andre D. Bannink, Gerard J. Stroomberg, Rosa M. A. Sjerps, Rosa Montes, Rosario Rodil, Jose Benito Quintana, Daniel Zahn, Herve Gallard, Tobias Mohr, Ivo Schliebner, Michael Neumann
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Philomina Onyedikachi Peter, Binessi Edouard Ifon, Francois Nkinahamira, Kayode Hassan Lasisi, Jiangwei Li, Anyi Hu, Chang-Ping Yu
Summary: This study investigates the relationship between dissolved organic matter (DOM) and Rare Earth Elements (REEs) in sediments from Yundang Lagoon, China. The results show four distinct fluorescent components, with protein-like substances being the most prevalent. Additionally, the total fluorescence intensity and LREE concentrations exhibit a synchronized increase from Outer to Inner to Songbai Lake core sediments. The findings demonstrate a strong correlation between DOM content and pollution levels.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Surya Gupta, Pasquale Borrelli, Panos Panagos, Christine Alewell
Summary: The objective of this study is to incorporate soil hydraulic properties into the erodibility factor (K) of USLE-type models. By modifying and improving the existing equations for soil texture and permeability, the study successfully included information on saturated hydraulic conductivity (Ksat) into the calculation of K factor. Using the Random Forest machine learning algorithm, two independent K factor maps with different spatial resolutions were generated. The results show that the decrease in K factor values has a positive impact on the modeling of soil erosion rates.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Jesmin Akter, Wendy J. M. Smith, Yawen Liu, Ilho Kim, Stuart L. Simpson, Phong Thai, Asja Korajkic, Warish Ahmed
Summary: The choice of workflow in wastewater surveillance has a significant impact on SARS-CoV-2 concentrations, while having minimal effects on HF183 and no effect on HAdV 40/41 concentrations. Certain components in the workflow can be interchangeable, but factors such as buffer type, chloroform, and homogenization speed can affect the recovery of viruses and bacteria.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Yu Luo, Xueting Yang, Diwei Wang, Hongmei Xu, Hongai Zhang, Shasha Huang, Qiyuan Wang, Ningning Zhang, Junji Cao, Zhenxing Shen
Summary: Atmospheric PM2.5, which can generate reactive oxygen species (ROS), is associated with cardiorespiratory morbidity and mortality. The study found that both the mass concentration of PM2.5 and the DTT activity were higher during the heating season than during the nonheating season. Combustion sources were the primary contributors to DTT activity during the heating season, while secondary formation dominated during the nonheating season. The study also revealed that biomass burning had the highest inherent oxidation potential among all sources investigated.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Erin L. Murphy, Leah R. Gerber, Chelsea M. Rochman, Beth Polidoro
Summary: Plastic pollution has devastating consequences for marine organisms. This study uses a trait-based framework to develop a vulnerability index for marine mammals, seabirds, and sea turtles in Hawai'i. The index ranks 63 study species based on their vulnerability to macroplastic pollution, providing valuable information for species monitoring and management priorities.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Kenji Maurice, Amelia Bourceret, Sami Youssef, Stephane Boivin, Liam Laurent-Webb, Coraline Damasio, Hassan Boukcim, Marc-Andre Selosse, Marc Ducousso
Summary: Growing pressure from climate change and agricultural land use is destabilizing soil microbial community interactions. Little is known about microbial community resistance and adaptation to disturbances, hindering our understanding of recovery latency and implications for ecosystem functioning. This study found that anthropic disturbance and natural disturbance have different effects on the topology and stability of soil microbial networks.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Yunhao Li, Yali Feng, Haoran Li, Yisong Yao, Chenglong Xu, Jinrong Ju, Ruiyu Ma, Haoyu Wang, Shiwei Jiang
Summary: Deep-sea mining poses a serious threat to marine ecosystems and human health by disturbing sediment and transmitting metal ions through the food chain. This study developed a new regenerative adsorption material, OMN@SA, which effectively removes metal ions. The adsorption mechanism and performance of the material for metal ion fixation were investigated.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Antonio Medici, Margherita Lavorgna, Marina Isidori, Chiara Russo, Elena Orlo, Giovanni Luongo, Giovanni Di Fabio, Armando Zarrelli
Summary: Valsartan, a widely used antihypertensive drug, has been detected in high concentrations in surface waters due to its unchanged excretion and incomplete degradation in wastewater treatment plants. This study investigated the degradation of valsartan and identified 14 degradation byproducts. The acute and chronic toxicity of these byproducts were evaluated in key organisms in the freshwater trophic chain.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Jiang Lin, Lianbao Chi, Qing Yuan, Busu Li, Mingbao Feng
Summary: This study investigated the photodegradation behavior and product formation of two representative pharmaceuticals in simulated estuary water. The study found that the formed transformation products of these pharmaceuticals have potential toxicity on marine organisms, including oxidative stress and damage to cellular components.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Hua Fang, Dongdong Jiang, Ye He, Siyi Wu, Yuehong Li, Ziqi Zhang, Haoting Chen, Zixin Zheng, Yan Sun, Wenxiang Wang
Summary: This study revealed that exposure to lower levels of air pollutants led to decreased pregnancy rates, with PM10, NO2, SO2, and CO emerging as the four most prominent pollutants. Individuals aged 35 and above exhibited heightened susceptibility to pollutants.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Ali Shaan Manzoor Ghumman, Rashid Shamsuddin, Amin Abbasi, Mohaira Ahmad, Yoshiaki Yoshida, Abdul Sami, Hamad Almohamadi
Summary: In this study, inverse vulcanized polysulfides (IVP) were synthesized by reacting molten sulfur with 4-vinyl benzyl chloride, and then functionalized using N-methyl D-glucamine (NMDG). The functionalized IVP showed a high mercury adsorption capacity and a machine learning model was developed to predict the amount of mercury removed. Furthermore, the functionalized IVP can be regenerated and reused, providing a sustainable and cost-effective adsorbent.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Rita Bonfiglio, Renata Sisto, Stefano Casciardi, Valeria Palumbo, Maria Paola Scioli, Erica Giacobbi, Francesca Servadei, Gerry Melino, Alessandro Mauriello, Manuel Scimeca
Summary: This study investigated the presence of aluminum in human colon cancer samples and its potential association with biological processes involved in cancer progression. Aluminum was found in tumor areas of 24% of patients and was associated with epithelial to mesenchymal transition (EMT) and cell death. Additional analyses revealed higher tumor mutational burden and mutations in genes related to EMT and apoptosis in aluminum-positive colon cancers. Understanding the molecular mechanisms of aluminum toxicity may improve strategies for the management of colon cancer patients.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)