Article
Engineering, Environmental
Riccardo Campo, Alberto Vassallo, Graziella Rabbeni, Walter Arancio, Giuseppe Gallo, Gaetano Di Bella
Summary: Reactivation of aerobic granular sludge (AGS) was applied to treat industrial slop wastewater with high salinity and hydrocarbons. Different treatment methods led to varying granulation effects and protein/polysaccharides ratio, ultimately resulting in different total petroleum hydrocarbons removal efficiencies. The presence of oil-polluted seawater-associated bacteria in the reactor cultivated with slop played a key role in the biodegradation of TPHs.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Engineering, Environmental
Marie Riisgaard-Jensen, Giulia Dottorini, Marta Nierychlo, Per Halkjaer Nielsen
Summary: The immigration of bacteria in influent wastewater has a strong impact on the microbial community of activated sludge in wastewater treatment plants. The use of primary settlers can selectively increase or reduce the abundance of certain bacteria. The process of primary settling changes the microbial community of influent wastewater and can be a candidate for upstream control to optimize the assembly of microbial communities in activated sludge.
Article
Environmental Sciences
Piotr Jachimowicz, Young-Jae Jo, Agnieszka Cydzik-Kwiatkowska
Summary: This study assessed the impact of polyethylene microplastics on aerobic granular sludge and found that the microplastics did not decrease the efficiency of biological treatment, but instead stimulated the production of extracellular polymeric substances and alginate. However, the presence of microplastics changed the morphology of the granular sludge and worsened the settling properties of the biomass.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Yu Jiang, Yu Shang, Wei Zhang, Xiangling Zhang, Jiangyun Li, Senlin Shao
Summary: SiO2 nanoparticles have a negative impact on the settleability of granules, while TiO2 nanoparticles improve the settleability. The presence of both types of nanoparticles does not significantly reduce the overall organic removal efficiency and enriches nanoparticle-resistant strains. Nitrification and denitrification efficiencies are affected differently by SiO2 and TiO2 nanoparticles.
Article
Engineering, Environmental
Cyntia Ely, Irina S. Moreira, Joao Paulo Bassin, Daniela P. Mesquita, Joana Costa, Eugenio C. Ferreira, Marcia W. C. Dezotti, Paula M. L. Castro
Summary: An AGS SBR reactor adapted to salinity was used for the treatment of synthetic saline wastewater containing EDCs. The results showed that E2 was completely biodegraded, while the removal efficiency of EE2 and BPA was lower. The activity of phosphate-accumulating organisms was affected by EDCs, but the activity of ammonium- and nitrite-oxidizing bacteria was not significantly affected. The microbial diversity increased after the addition of EDCs.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Xueping Tian, Jingtao Zhao, Jun Huang, Guoke Chen, Yonggui Zhao
Summary: The metabolic process of aerobic granular sludge (AGS) treating piggery wastewater with high concentrations of carbon and nitrogen was elucidated through a combined analysis of microbial community, denitrification genes, and mathematical model calculations. The dominant microorganisms in AGS had potentials of various metabolic activities, with aerobic denitrification process being dominant. The study also revealed the resistance of rapid organic substrates storage in AGS during feast phase against high strength wastewater, providing carbon and energy sources in the famine phase.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Laila Dina Amalia Purba, Sasmitha Aulia Zahra, Ali Yuzir, Koji Iwamoto, Norhayati Abdullah, Kazuya Shimizu, Zhongfang Lei, Joni Hermana
Summary: This study investigated the performance of algal-bacterial aerobic granular sludge in real low-strength wastewater treatment and its potential for biodiesel production. The results showed high removal efficiencies for COD, NH4+-N, and phosphate, meeting the effluent standard. Core microbiome analysis revealed important microbial groups in the bacterial community, while photosynthetic microorganisms dominated the algal-bacterial aerobic granular sludge. High lipid content and favorable fatty acid composition were found in the granules, indicating their potential for biodiesel production.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Agricultural Engineering
Amanda Ferreira dos Santos, Francisca Kamila Amancio Frutuoso, Clara de Amorim de Carvalho, Vitor Nairo Sousa Aguiar Lira, Antonio Ricardo Mendes Barros, Andre Bezerra dos Santos
Summary: This study evaluated the influence of carbon sources on the biosynthesis of alginate-like exopolymers (ALE) and tryptophan (Trp) in aerobic granular sludge (AGS). Acetate proved to be the best substrate for producing both ALE and Trp, while propionate and glycerol also showed potential. Glucose yielded the poorest results compared to other substrates.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Chunli Wan, Zhengwen Li, Liyan Deng, Yue Yuan, Changyong Wu
Summary: In this study, the outer, middle, and inner layers of matured aerobic granular sludge (AGS) were obtained. The adhesion of microorganisms in the inner layer was significantly higher during the famine period, while the adhesion of microorganisms in the middle and outer layers was significantly higher during the feast period. The study found that AGS formation started during the famine period and the feast period promoted an increase in particle size.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Yi-Jing Shi, Lei Yang, Sheng-Fa Liao, Li-Guo Zhang, Zi-Cong Liao, Min-Yi Lan, Feng Sun, Guang-Guo Ying
Summary: This study found that under high levels of ammonium, aerobic granular sludge (AGS) showed good removal efficiency for three fluoroquinolones (FQs), with ciprofloxacin (CFX) and norfloxacin (NFX) being more effectively removed. Antibiotic resistance genes (ARGs) and mobile genetic elements (MGEs) related to FQs tended to exist in denitrifying bacteria, indicating a preference for denitrifiers in the distribution of these elements.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Yu Jin, Wei Xiong, Dan Liu, Zhiqing Wu, Gang Xiao, Shaojie Wang, Haijia Su
Summary: By developing a straw foam-based aerobic granular sludge (SF-AGS), the drug tolerance and biodegradation efficiency of atrazine (ATZ) can be greatly improved. The results showed that ATZ, as well as chemical oxygen demand (COD), ammonium nitrogen (NH4+-N), total phosphorus (TP), and total nitrogen (TN), were effectively removed within 6 hours, with removal efficiencies as high as 93.37%, 85.33%, 84.7%, and 70%, respectively. The SF-AGS also stimulated the secretion of three times more extracellular polymers by microbial consortia. The study demonstrated the feasibility of SF-AGS for the treatment of ATZ-laden low-strength wastewater.
Article
Agricultural Engineering
Wei Xiong, Shaojie Wang, Qiuhua Zhang, Yiran Hou, Yu Jin, Biqiang Chen, Haijia Su
Summary: This study evaluated the effect of neglected PAN MPs on AGS at different concentrations. The results showed that 1 and 10 mg/L concentrations of PAN MPs had no significant impact on granular stability and nutrient removal, but greatly increased EPS secretion. However, at 100 mg/L, PAN MPs severely damaged the granule structure. Microbial community analysis revealed the dominance of phylum Proteobacteria in resisting PAN MPs. Metabolic analysis also showed significant inhibition of genes related to denitrification pathway and membrane transport under PAN MPs stress. This study provides additional information on microplastics wastewater treatment using AGS.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
Xiaoying Zheng, Zongshuo Han, Xiaoyao Shao, Zhilin Zhao, Huijie Zhang, Tao Lin, Shanshan Yang, Chao Zhou
Summary: Microplastics, specifically polyethylene microplastics (PE MPs), have been found to significantly impact the aerobic granular sludge (AGS) in wastewater treatment plants. The presence of PE MPs affects the particle structure, settling properties, particle size distribution, and extracellular polymeric substance characteristics of the AGS. Exposure to PE MPs also leads to an increase in reactive oxygen species and lactate dehydrogenase, resulting in disruption of cellular structure. Additionally, the activities of enzymes related to denitrification and phosphorus removal decrease.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Danqing Wu, Bin Zhao, Peng Zhang, Qiang An
Summary: This study aimed to investigate the role of nitrate in aerobic granular sludge (AGS) granulation. The addition of nitrate significantly improved AGS formation, but long-term nitrate feeding caused disintegration. Nitrate promoted AGS formation by upregulating c-di-GMP and extracellular polymeric substances (EPS), but excessive nitrate led to disintegration by downregulating c-di-GMP and EPS. Metabolic analysis showed that amino acid metabolism was mainly affected by nitrate.
Article
Engineering, Environmental
Mingyue Geng, Shijie You, Haijuan Guo, Fang Ma, Xiao Xiao, Xiping Ma
Summary: This study investigated a system where flocs and granules coexist, and compared the differences between them on a proteomic level. The results showed that the coexistence system had excellent nutrient removal and different functional bacteria in flocs and granules.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Elizabeth Alvarez-Chavez, Stephane Godbout, Mylene Genereux, Caroline Cote, Alain N. Rousseau, Sebastien Fournel
Summary: This study evaluated the effect of alternative filtering materials and bed aeration on the retention of nutrients and fecal bacteria in woodchip bedded stand-off pads for cows. The results showed that the alternative biofilters were more efficient in removing COD, SS, TN, and NO3-N, while conventional biofilters were more efficient for PO4-P removal. Aeration did not have a significant effect under the tested temperature conditions.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Yike Zhang, Zengyi Ma, Zhuoting Fang, Yuandong Qian, Zhiping Huang, Yilong Ye, Jianhua Yan
Summary: This study investigates the application of oxygen enrichment melting technology in the melting of municipal solid waste incineration fly ash. The results demonstrate that oxygen enrichment technology can reduce energy consumption and operating costs, as well as decrease pollution emissions.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Liangang Xiao, Mingkai Leng, Philip Greenwood, Rongqin Zhao, Zhixiang Xie, Zengtao You, Junguo Liu
Summary: This study investigates the effects of grazing exclusion on soil organic carbon (SOC) accumulation and vegetation recovery. It finds that grazing exclusion can increase the potential for SOC accumulation, and higher annual precipitation is positively correlated with SOC accumulation.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Beatrice Cantoni, Jessica Ianes, Beatrice Bertolo, Selena Ziccardi, Francesco Maffini, Manuela Antonelli
Summary: This study evaluates the performance of ozonation and adsorption as in-series processes compared to standalone processes for the removal of Contaminants of Emerging Concern (CECs) in drinking water. The combination of both processes proves to be more effective than adsorption and ozonation alone. Ozonation improves the adsorption performance of poorly-oxidizable CECs but worsens that of well-oxidizable compounds. This research highlights the importance of considering both processes in the removal of CECs in drinking water treatment plants.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Dan Li, Bingjun Liu, Yang Lu, Jianyu Fu
Summary: A new Standardized compound Drought and Saltwater intrusion Index (SDSI) was developed to detect changes in the severity of CDSEs in six estuaries. The study found that saltwater intrusion plays a dominant role in influencing SDSI severity, and CDSEs vary in frequency, duration and severity among different estuaries.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Yong-Qiang Li, Rui Sun, Chong-Miao Zhang, Zi-Xuan Liu, Rui-tao Chen, Jian Zhao, Hua-dong Gu, Huan-Cai Yin
Summary: In this study, an electron beam excitation multi-wavelength ultraviolet (EBE-MW-UV) system was established and found to have significantly higher microbial inactivation effects compared to single-wavelength UV-LEDs in water. Mechanism analysis revealed that EBE-MW-UV damaged microbial DNA and proteins, and generated additional reactive oxygen species, leading to microbial inactivation.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Kaili Ma, Xinxin Han, Qiujuan Li, Yu Kong, Qiaoli Liu, Xu Yan, Yahong Luo, Xiaopin Li, Huiyang Wen, Zhiguo Cao
Summary: This study reveals that the use of a tryptophan-degrading microbial consortium (TDC) can enhance the hydrolysis efficiency of waste activated sludge (WAS), increasing the yield and quality of short chain fatty acids (SCFAs) and improving the solubilization and release of organic substances from WAS.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Ling Xiong, Rui Li
Summary: Incorporating Ecosystem Service Value (ESV) into land use planning can provide informed land management decisions. This study evaluates the ESV of Guizhou Province in China's karst region. The results show an increase in total ESV over the past two decades due to ecological restoration projects.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
M. Geetha Jenifel
Summary: This article discusses the importance of water and the pollution of freshwater resources, and introduces the use of machine learning models and blockchain technology to predict and protect water quality.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Stanslaus Terengia Materu, Taotao Chen, Chang Liu, Daocai Chi, Meng Jun
Summary: The study showed that H2SO4-modified biochar can reduce P leaching, increase soil available P, and enhance plant P uptake in alternate wetting and drying irrigation systems. Biochar additions B20A and IAWDB20A-M were effective in improving yield, reducing P leaching, and increasing APB.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Amir Nouri, Ali Akbar Zinatizadeh, Sirus Zinadini, Mark Van Loosdrecht
Summary: This study focuses on the development of an air-lift bio-electrochemical reactor (ALBER) with a continuous feeding regime to enhance nitrogen removal from synthetic wastewater. The effect of temperature, hydraulic retention time (HRT), N -NH+4 /TN ratio, and current density on the reactor performance was investigated, and the ALBER achieved a maximum TN removal of 73%. The results suggest that the ALBER has potential for treating industrial wastewater at low temperatures.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Peifang Wang, Guoxiang You, Yang Gao, Juan Chen, Xun Wang, Chao Wang
Summary: This study investigated the ecological processes of microbial communities and N- and P-transformation processes in multistage agricultural drainage ditches. The results showed that the microbial communities were co-shaped by agricultural practices and ditch size, which further governed the N and P removal performance.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Xiaofeng Niu, Huan Wang, Tao Wang, Peiyu Zhang, Huan Zhang, Hongxia Wang, Xianghong Kong, Songguang Xie, Jun Xu
Summary: Microorganisms play a critical role in maintaining ecosystem balance, and environmental stressors can affect the assembly processes of microbial communities. The study found that different stressors have opposite effects on microbial community assembly in water and sediment, and warming has different influences compared to herbicides and nutrients.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Yuqing Tan, Qiming Cheng, Fengwei Lyu, Fei Liu, Linhao Liu, Yihong Su, Shaochun Yuan, Wenyu Xiao, Zhen Liu, Yao Chen
Summary: The exacerbation of global warming, extreme weather events, and rapid urbanization have led to increased flooding in urban areas. China has adopted sponge city as an efficient means of preventing and controlling urban floods. Using a SWMM-FVCOM model, the hydrological reduction and control effect of sponge city construction (SPCC) within a university campus were evaluated. The study found that implementing SPCC effectively mitigates surface runoff and reduces the severity of urban flooding. However, the efficacy of runoff control decreases with longer rainfall return periods.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Zhonghan Chen, Qiuyan Li, Shibo Yan, Juan Xu, Qiaoyun Lin, Zhuangming Zhao, Ziying He
Summary: Tidal rivers are important biochemical reaction channels, receiving carbon from wastewater and agricultural drains, affecting CO2 emissions. Through modeling and data analysis, researchers explored carbon distribution, emissions, and greenhouse effects, emphasizing the potential of river management to change global CO2 emissions under climate change.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)