Article
Engineering, Environmental
Yoan Pechaud, Sylvain Pageot, Anne Goubet, Camilo Duran Quintero, Sylvie Gillot, Yannick Fayolle
Summary: The study investigated the relationship between hydrodynamic conditions and activated sludge floc size properties in different systems. The Floc size distribution mainly depends on the average shear rate and circulation time, with local properties like maximal shear rate also playing a role. Flocs were slightly larger in the pilot bubble column compared to the standard stirred reactor, and characteristic diameters were lower in the filtration zone than in the aeration zone in full-scale systems.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Nguyen Hong Dan, Tran Thi My Phe, Bui Xuan Thanh, Jan Hoinkis, Tran Le Luu
Summary: ICEAS technology is an effective solution for treating various wastewaters, showing high efficiencies in removing organic compounds and nutrients, and promoting the growth of microbial communities.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Review
Agricultural Engineering
Sining Zhou, Min Liu, Ben Chen, Lianpeng Sun, Hui Lu
Summary: This review provides a systematic introduction to microbubble and nanobubble aeration in the activated sludge process, highlighting their potential applications and mechanism for improving gas-liquid mass transfer. It also discusses the recent advances and effects of microbubble and nanobubble aeration in wastewater treatment.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Tiantian Hu, Yongzhen Peng, Chuansheng Yuan, Qiong Zhang
Summary: The novel SPNEDpr system operated for 213 days in a sequencing batch reactor to treat real domestic sewage, achieving efficient nutrient removal and the formation of aerobic granular sludge through optimizing intermittent aeration conditions. The system provided a highly efficient and economical method for treating urban sewage.
Article
Engineering, Environmental
Mengjie Liu, Nigel J. D. Graham, Lei Xu, Kai Zhang, Wenzheng Yu
Summary: A bubbleless aerated BAC process was developed by installing a hollow fiber membrane module within a BAC filter, which improved the dissolved oxygen concentrations and enhanced the biodegradation and metabolism capacity. The ABAC system showed a higher electron transfer capacity and lower extracellular polymeric substances secretion, resulting in enhanced contaminant degradation efficiency and long-term stability. This proposed ABAC filter provides a practical example of how to shape and activate microbial community in BAC technology.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Review
Engineering, Environmental
Recep Kaya, Mustafa Evren Ersahin, Hale Ozgun, Borte Kose-Mutlu, Mehmet Emin Pasaoglu, Ismail Koyuncu
Summary: Membrane bioreactor (MBR) technology is considered a promising method for advanced wastewater treatment due to its high-quality effluent. However, fouling caused by intensive activated sludge used in submerged MBR systems is a major issue. To overcome this problem, researchers have explored the use of vibratory processes in MBRs. This review aims to gather current efforts in fouling control by vibratory motion, specifically in submerged activated sludge membrane bioreactors, and presents a comparative analysis of different vibration types and their experimental results.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Environmental Sciences
G. Plestenjak, K. Eler, R. Mihelic, M. Ferlan, N. Ogrinc, B. Krajnc, D. Vodnik
Summary: The study showed that artificial aeration can accelerate the sludge decomposition process in STRBs, whether through active aeration or passive aeration beds. However, this acceleration effect is limited to certain seasons and aspects of CO2 emissions.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Environmental Sciences
Hazal Gulhan, Reza Faraji Dizaji, Muhammed Nimet Hamidi, Amr Mustafa Abdelrahman, Safak Basa, Ece Sagir Kurt, Ismail Koyuncu, Huseyin Guven, Hale Ozgun, Mustafa Evren Ersahin, Izzet Ozturk
Summary: This study investigates the utilization of water treatment plant (WTP) sludge in a pilot-scale high-rate activated sludge (HRAS) system as an alternative to conventional coagulants. The results show that the addition of iron sludge can improve the removal efficiency of particulate chemical oxygen demand (pCOD) in the HRAS process and enhance the settleability of the sludge. However, it also decreases the biochemical methane potential (BMP) of the HRAS process sludge. The scenario analysis demonstrates that using WTP sludge as a coagulant can reduce overall costs without significantly affecting the environmental impact indicator (EQI) in the HRAS plant.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Mengjie Liu, Nigel Graham, Lei Xu, Kai Zhang, Wenzheng Yu
Summary: Drinking water supply in rural areas is a challenging issue, and low-cost, efficient water treatment processes are needed to provide safe and affordable drinking water. This study proposes and evaluates a bubbleless aeration BAC (ABAC) process with a hollow fiber membrane (HFM) assembly, which improves dissolved oxygen (DO) throughout the filter and enhances DOM removal efficiency. Results show that ABAC significantly increases DOC removal and decreases disinfection byproduct formation compared to a comparable filter without aeration. The proposed ABAC treatment, with its various advantages, is well-suited for decentralized drinking water systems in rural areas.
Article
Biotechnology & Applied Microbiology
Vijay Sodhi, Ajay Bansal, Mithilesh Kumar Jha
Summary: This study experimentally elucidated the role of extracellular polymeric substances (EPS) in minimizing excess sludge yield in tannery wastewater treatment using a hybrid activated sludge system (MANODOX). The results showed that the MANODOX system significantly reduced sludge yield compared to the conventional p-CAS system, with lowered EPS accumulation and sludge generation. The strict maintenance of sludge retention time and the stimulation of cell-lysis in the MANODOX system were identified as key factors in influencing floc characteristics and EPS degradation.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Engineering, Environmental
Nanfei Geng, Shaojie Wang, Tenghui Hu, Yingyun Chen, Haijia Su
Summary: The universality of mycelium pellet (MP) assisted flocculent activated sludge (FAS) granulation was investigated using four different filamentous microbes. The results showed that the use of MP for flocculation was more effective than filamentous spores, leading to the formation of granular sludge with dense structure. The MP-based aerobic granular sludge (MP-AGS) demonstrated improved sedimentation performance and higher biological enzyme activity compared to FAS. Furthermore, MP-AGS achieved higher TN and TP removal efficiencies under high influent loads. This study confirms the feasibility of using mycelium pellet assisted flocculent activated sludge granulation with different microbes.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Engineering, Environmental
Chong-Yang Ren, En-Ling Wu, Erica M. Hartmann, He-Ping Zhao
Summary: This study demonstrates that the dissemination and enrichment of antibiotic resistance genes can be reduced through bioaugmentation with antioxidant-producing microorganisms, thereby decreasing bacterial resistance to antibiotics.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Environmental Sciences
A. Ruiz-Munoz, J. A. Siles, P. Marquez, M. Toledo, M. C. Gutierrez, M. A. Martin
Summary: This study evaluated five urban wastewater treatment plants with different biological treatment, wastewater types, and sizes, aiming to analyze and compare odor emissions and identify the main causes. The results showed that facilities with EAAS technology were more efficient than RBC, and sludge management facilities were identified as the critical odor source. Chemometric analysis helped to find differences between the plants.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Environmental
Alicia Checa Fernandez, Luz Marina Ruiz, Jorge Ignacio Perez, Miguel Gomez
Summary: This study measured the effect of low activated sludge dissolved oxygen (DO) concentration on a membrane bioreactor (MBR) treating real urban wastewater. Results showed that employing low DO set points is a promising strategy for application in MBR systems, but DO concentrations lower than 0.2 mgO(2)L(-1) resulted in deterioration of effluent quality.
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
(2021)
Article
Engineering, Environmental
Jia-Ying He, Hong-Ling Zhang, Hong Wang, Ya-Qi Hu, Yong Zhang
Summary: The effects of pure oxygen aeration on the compositional characteristics of SMP and EPS in activated sludge were studied. Different aeration methods and rates can change the structure of extracellular products and affect the proportion of proteins and polysaccharides. Adjusting the aeration rate and mode can regulate the components in extracellular products to optimize the treatment process of activated sludge.
WATER SCIENCE AND TECHNOLOGY
(2021)
Article
Environmental Sciences
Gaetano Di Bella, Giorgio Mannina
Article
Chemistry, Multidisciplinary
Lucia Lumia, Maria Gabriella Giustra, Gaspare Viviani, Gaetano Di Bella
APPLIED SCIENCES-BASEL
(2020)
Article
Environmental Sciences
Giorgio Mannina, Luigi Badalucco, Lorenzo Barbara, Alida Cosenza, Daniele Di Trapani, Giuseppe Gallo, Vito Armando Laudicina, Giuseppe Marino, Sofia Maria Muscarella, Dario Presti, Herman Helness
Summary: Wastewater treatment plants need an urgent transition to a circular economy for resource recovery and sustainable waste management. However, technical, economic, social, and regulatory barriers make this transition complex and long. The EU's WIDER UPTAKE project aims to overcome these barriers and facilitate the shift from a linear to a circular economy model for WWTPs.
Review
Biochemistry & Molecular Biology
Riccardo Campo, Claudio Lubello, Tommaso Lotti, Gaetano Di Bella
Summary: This review discusses the impact of aerobic granular sludge on performance and membrane fouling in combined aerobic granular sludge-membrane bioreactor systems. The research highlights that while aerobic granular sludge technology can mitigate fouling, granule breakage remains a critical issue to be addressed in the AGS-MBR process.
Article
Environmental Sciences
Giorgio Mannina, Luigi Badalucco, Lorenzo Barbara, Alida Cosenza, Daniele Di Trapani, Vito Armando Laudicina, Sofia Maria Muscarella, Dario Presti
Summary: The current exploitation of freshwater and the increase in sewage sludge production pose a critical challenge for sustainable development and the circular economy. There is a need to rethink the concept of wastewater treatment plants and shift towards water resource recovery facilities (WRRFs). This study aims to demonstrate the effectiveness of resource recovery systems through case studies, highlighting the importance of plant optimization in reducing greenhouse gas emissions from WRRFs.
Article
Environmental Sciences
Giorgio Mannina, Rosa Alduina, Luigi Badalucco, Lorenzo Barbara, Fanny Claire Capri, Alida Cosenza, Daniele Di Trapani, Giuseppe Gallo, Vito Armando Laudicina, Sofia Maria Muscarella, Dario Presti
Summary: The article introduces a case study on water resource recovery, aiming to demonstrate the importance of a resource recovery system based on the circular economy concept. It highlights the potential of the wastewater treatment plant and the central role of the university in fostering the transition towards circular economy.
Article
Biochemistry & Molecular Biology
Gaetano Di Bella, Santo Fabio Corsino, Federica De Marines, Francesco Lopresti, Vincenzo La Carrubba, Michele Torregrossa, Gaspare Viviani
Summary: This study examined the presence of microplastics in the sludge of three wastewater treatment plants. The findings showed that microplastics were transferred and concentrated in the waste sludge, with different shapes and compositions observed in different treatment processes. This is an important discovery as sludge disposal could become a new pathway for microplastic release into the environment.
Article
Biochemistry & Molecular Biology
Santo Fabio Corsino, Gaetano Di Bella, Francesco Traina, Lucia Argiz Montes, Angeles Val del Rio, Anuska Mosquera Corral, Michele Torregrossa, Gaspare Viviani
Summary: In this study, a biological strategy was employed in the MBR system to reduce membrane fouling tendency. By controlling the operating conditions, the organic matter was directed towards the accumulation of intracellular polymers (PHA), leading to a decrease in extracellular polymeric substances (EPS) and a reduction in fouling rate. This highlights the possibility of minimizing membrane fouling and recovering bioplastic precursors from wastewater in line with the circular economy model.
Article
Environmental Sciences
Francesco Traina, Santo Fabio Corsino, Michele Torregrossa, Gaspare Viviani
Summary: The study aimed to evaluate the production of polyhydroxyalkanoates (PHA) and extracellular polymeric substances (EPS) from agro-industrial wastewater treatment. Results showed that both aerobic granular sludge (AGS) and sequencing batch reactor (SBR) systems were effective in enriching biopolymers. The AGS system had a higher biopolymers accumulation capacity and EPS content, while the SBR system achieved higher PHA production.
Article
Environmental Sciences
Santo Fabio Corsino, Daniele Di Trapani, Federica De Marines, Michele Torregrossa, Gaspare Viviani
Summary: The present study evaluated the effects of different sludge-reduction mechanisms on methane productivity in the oxic-settling-anaerobic (OSA) process. Scheme A promoted an overall increase in methane production (+19%), but resulted in a significant decrease in excess sludge production (31%). Scheme B led to a higher reduction of excess sludge (82%), but a significant decrease in methane productivity (-41%). These findings suggest that specific sludge-reduction mechanisms can be triggered in the OSA process to maintain high levels of methane production.
Article
Green & Sustainable Science & Technology
Alice Sorrenti, Santo Fabio Corsino, Francesco Traina, Gaspare Viviani, Michele Torregrossa
Summary: This study presents the results of using an innovative configuration of a closed-static solar greenhouse for sludge drying. The configuration involved a forced ventilation system for supplying hot air and utilization of solar irradiation for energy supply. The experiments showed successful drying of wet sewage sludge to a low residual humidity using this solar greenhouse system. The airflow rate and air supply promoted both sludge drying and stabilization. The specific energy consumption per ton of evaporated water was significantly lower compared to conventional thermal drying systems, making solar greenhouse drying a promising option for medium-small sized wastewater treatment plants.
CLEAN TECHNOLOGIES
(2022)
Article
Computer Science, Information Systems
Antonio Picone, Maurizio Volpe, Maria Gabriella Giustra, Gaetano Di Bella, Antonio Messineo
Summary: Hydrothermal carbonization (HTC) is a promising method for converting waste biomass into solid biofuels, but it generates organic process water (PW) that needs proper disposal. This study recycled PW from lemon peel waste HTC to maximize energy recovery and reduce environmental impact. Results showed that PW recirculation increased solid mass yield, particularly at lower HTC temperatures, leading to enhanced energy yield. Further investigation into different biomasses and operating conditions is encouraged.
APPLIED SYSTEM INNOVATION
(2021)
Article
Agricultural Engineering
Yinping Xiang, Meiying Jia, Rui Xu, Jialu Xu, Lele He, Haihao Peng, Weimin Sun, Dongbo Wang, Weiping Xiong, Zhaohui Yang
Summary: This study investigated the impact of the non-antibiotic pharmaceutical carbamazepine on antibiotic resistance genes (ARGs) during anaerobic digestion. The results showed that carbamazepine induced the enrichment of ARGs and increased the abundance of bacteria carrying these genes. It also facilitated microbial aggregation and intercellular communication, leading to an increased frequency of ARGs transmission. Moreover, carbamazepine promoted the acquisition of ARGs by pathogens and elevated their overall abundance.
BIORESOURCE TECHNOLOGY
(2024)
Review
Agricultural Engineering
Weixin Zhao, Tianyi Hu, Hao Ma, Dan Li, Qingliang Zhao, Junqiu Jiang, Liangliang Wei
Summary: This review summarizes the effects and potential mechanisms of biochar on microbial behavior in AD systems. The addition of biochar has been found to promote microbial colonization, alleviate stress, provide nutrients, and enhance enzyme activity. Future research directions include targeted design of biochar, in-depth study of microbial mechanisms, and improved models.
BIORESOURCE TECHNOLOGY
(2024)
Review
Agricultural Engineering
Christina Karmann, Anna Magrova, Pavel Jenicek, Jan Bartacek, Vojtech Kouba
Summary: This review assesses nitrogen removal technologies in reject water treatment, highlighting the differences in environmental impacts and economic benefits. Partial nitritation-anammox shows potential for economic benefits and positive environmental outcomes when operated and controlled properly.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Wei-Hao Huang, Ying-Ju Chang, Duu-Jong Lee
Summary: This study modified pinecone biochar with layered double hydroxide (LDH) to enhance its adsorption capacity for heavy metal and phosphate ions. The LDH-biochar showed significantly improved adsorption capacities for Pb2+ and phosphate, and a slight increase for Cu2+ and Co2+. The LDH layer enhanced the adsorption through various mechanisms.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Chao Song, Fanfan Cai, Shuang Yang, Ligong Wang, Guangqing Liu, Chang Chen
Summary: This paper developed a machine learning model to predict the biochemical methane potential during anaerobic digestion. Model analysis identified lignin content, organic loading, and nitrogen content as key attributes for methane production prediction. For feedstocks with high cellulose content, early methane production is lower but can be improved by prolonging digestion time. Moreover, lignin content exceeding a certain value significantly inhibits methane production.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Sang Min Lee, Ju Young Lee, Ji-Sook Hahn, Seung-Ho Baek
Summary: This study successfully developed an efficient platform strain using Yarrowia lipolytica for the bioconversion of renewable resources into adipic acid, achieving a remarkable increase in production level.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Sefkan Kendir, Matthias Franzreb
Summary: This study presents a novel approach using magnetic separation to efficiently harvest freshwater microalgae, Chlorella vulgaris. By combining pH-induced calcium phosphate precipitation with cheap natural magnetite microparticles, harvesting efficiencies up to 98% were achieved in the model medium.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Ishaq Kariim, Ji-Yeon Park, Wajahat Waheed Kazmi, Hulda Swai, In-Gu Lee, Thomas Kivevele
Summary: The impact of reaction temperature, residence time, and ethanol: acetone on the energy compositions and yield enhancement of biocrudes was investigated. The results showed that under appropriate conditions, biocrudes with high energy and low oxygen content can be obtained, indicating a high potential for utilization.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Xiyue Zhang, Xiyao Li, Liang Zhang, Yongzhen Peng
Summary: Intermittent aeration is an innovative approach to enhance nitrogen removal in low carbon-to-nitrogen ratio municipal sewage, providing an efficient strategy for the continuous plug-flow AOA process.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Xu Yang, Mahmoud Mazarji, Mengtong Li, Aohua Li, Ronghua Li, Zengqiang Zhang, Junting Pan
Summary: This study investigated the impact of magnetite on the nitrogen cycle of pig manure biostabilisation. The addition of magnetite increased N2O emissions and decreased NH3 emissions during composting. It also increased the total nitrogen content but should be considered for its significant increase in N2O emissions in engineering practice.
BIORESOURCE TECHNOLOGY
(2024)
Review
Agricultural Engineering
Ty Shitanaka, Haylee Fujioka, Muzammil Khan, Manpreet Kaur, Zhi-Yan Du, Samir Kumar Khanal
Summary: The market value of microalgae has exponentially increased in the past two decades, thanks to their applications in various industries. However, the supply of high-value microalgal bioproducts is limited due to several factors, and strategies are being explored to overcome these limitations and improve microalgae production, thus increasing the availability of algal-derived bioproducts in the market.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Martin Kerner, Thorsten Wolff, Torsten Brinkmann
Summary: The efficiency of using enriched CO2 from flue gas for large-scale production of green microalgae has been studied. The results show that the use of membrane devices and static mixers can effectively improve the CO2 recovery rate and maintain the suitable pH and temperature during cultivation, achieving a more economical and sustainable microalgae production.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Rui Ma, Ji Li, Rd Tyagi, Xiaolei Zhang
Summary: This review summarizes the microorganisms capable of using CO2 and CH4 to produce PHAs, illustrating the production process, factors influencing it, and discussing optimization techniques. It identifies the challenges and future prospects for developing economically viable PHAs production using GHGs as a carbon source.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Bing Wang, Peng Zhang, Xu Guo, Xu Bao, Junjie Tian, Guomin Li, Jian Zhang
Summary: The addition of zeolite in the co-composting of chicken manure and straw significantly reduced the emissions of ammonia and N2O, and increased the nitrate content. Zeolite also promoted the abundance of nitrification genes and inhibited the expression of denitrification genes.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Rohit Dey, Franziska Ortiz Tena, Song Wang, Josef Martin Messmann, Christian Steinweg, Claudia Thomsen, Clemens Posten, Stefan Leu, Matthias S. Ullrich, Laurenz Thomsen
Summary: This study investigated the operation of a 1000L microalgae-based membrane photobioreactor system for continuous secondary wastewater treatment. The research focused on a green microalgae strain called Desmodesmus sp. The study aimed to understand key trends and optimization strategies by conducting experiments in both summer and winter seasons. The findings showed that maintaining low cell concentrations during periods of light inhibition was beneficial for nutrient uptake rates. Effective strategies for enhancing algae-based wastewater treatment included cell mass recycling and adjusting dilution rates based on light availability.
BIORESOURCE TECHNOLOGY
(2024)
