Article
Agricultural Engineering
Moein Besharati Fard, Di Wu
Summary: This review provides a comprehensive overview of the compositions and interactions of microalgal and bacterial consortia in MB-AGS, as well as their role in wastewater treatment and resource recovery, and the factors influencing their interactions and EPS production. It also briefly discusses the opportunities and major challenges of utilizing the microalgal-bacterial biomass and EPS for phosphorus and polysaccharides chemical recovery, and renewable energy production. Overall, this compact review will contribute to the development of MB-AGS biotechnology.
BIORESOURCE TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Yabing Xiao, Yao Shen, Bin Ji
Summary: This research focused on cultivating MBGS from activated sludge by inoculation. The results showed that inoculation helped in the successful formation of MBGS within a short period of time, and achieved stable removal of organics, ammonia, and phosphorus. Functional microbial communities, including phosphorus accumulating organisms, were enhanced by the inoculation.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Xiaoying Zheng, Huijie Zhang, Zhi Xu, Tao Lin, Shanshan Yang, Zhilin Zhao, Zongshuo Han, Chao Zhou
Summary: The study found that the widespread use of perfluorooctanoic acid (PFOA) has led to its frequent detection in wastewater. In short-term experiments, low concentrations of PFOA had little impact on aerobic granular sludge (AGS), while high concentrations significantly damaged the key enzyme activities of AGS, leading to a decrease in nutrient removal efficiency. In long-term experiments, through operation strategy adjustments and self-regulation, the key enzyme activities of AGS were recovered, but the long-term adverse effects of high concentrations of PFOA on AGS were still difficult to alleviate.
Article
Environmental Sciences
Gonglei Wang, Xiaoxiao Huang, Shuai Wang, Fan Yang, Shiting Sun, Peng Yan, Youpeng Chen, Fang Fang, Jinsong Guo
Summary: The food-to-microorganism ratio (F/M) is an important parameter that affects the settleability of aerobic granular sludge (AGS). This study found a relationship between F/M and the sludge volume index (SVI), and identified Thiothrix and Candidatus_Competibacter as dominant bacteria influencing AGS settling performance. The study also showed that an increase in F/M led to a decrease in AGS settling performance, but high levels of gellike polysaccharides effectively retained the granular biomass, resulting in the recovery of AGS settleability.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Agricultural Engineering
Qiulai He, Zhiyi Xie, Zhidong Fu, Meng Wang, Peng Xu, Jian Yu, Jingwei Ma, Shuxian Gao, Li Chen, Wei Zhang, Jianyang Song, Hongyu Wang
Summary: This study compared the tolerance ability of incomplete and complete granulation sludge to oxytetracycline (OTC), finding that incomplete granulation sludge showed better denitrification performance and resistance, while complete granulation sludge suffered a permanent collapse under high OTC concentrations.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Yu Jin, Wei Xiong, Nan Zhou, Gang Xiao, Shaojie Wang, Haijia Su
Summary: The structure of bacterial community in seed sludge varies greatly from different sources, influencing the characteristics of sludge. This study investigated the role of different functional bacteria in AGS granulation and pollutant degradation using seed sludge obtained from different sources. Results showed that the initial bacterial community significantly affected AGS formation and pollutants removal, with seed sludge from municipal sludge granulating faster and achieving better settling performance and granulation.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Agricultural Engineering
Lingfeng Ouyang, Bin Qiu
Summary: The positive effect of magnetic Fe3O4@polyaniline (Fe3O4@PANI) on sludge granulation and wastewater treatment performance was investigated in this study. The addition of Fe3O4@PANI into a sequencing batch reactor for cultivating aerobic granular sludge (AGS) promoted the formation and stability of AGS. Fe3O4@PANI stimulated the secretion of extracellular polymeric substances with a higher proteins/polysaccharides ratio, enhancing the stability of AGS. Furthermore, Fe3O4@PANI enriched denitrifying bacteria, phosphorus accumulating organisms (PAO), and denitrifying PAO, which contributed to the excellent denitrification and phosphorus removal performance of AGS.
BIORESOURCE TECHNOLOGY
(2023)
Article
Engineering, Environmental
Junguo He, Jie Xu, Huarong Yu
Summary: This study successfully cultivated stable aerobic granular sludge (AGS) with compact structure and excellent settle-ability at 10 degrees C using melamine framework (MF). MF promoted sludge granulation by providing support at different stages, accelerating the granulation process and improving AGS stability.
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
Zejiao Li, Jixiang Wang, Xingyu Chen, Zhongfang Lei, Tian Yuan, Kazuya Shimizu, Zhenya Zhang, Duu-Jong Lee
Summary: This study found that aerobic phosphorus removal in the algal-bacterial aerobic granular sludge (AGS)-based wastewater treatment system is mainly controlled by macropore and micropore diffusion. The increase in light intensity promotes microalgae metabolism and leads to an increase in wastewater pH. The pH increase has a strong negative correlation with phosphorus uptake by polyphosphate-accumulating organisms and promotes chemical precipitation at a specific calcium to phosphorus ratio.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Bing Zhang, Xin Mao, Dongmei Huang, Chong Liu, Wenjie Yin, Yu Shen, Wenxin Shi
Summary: The size of ABGS particles has a significant impact on the operation time and fouling resistance of the ABGS-MBR system. The optimal particle size of 0.85-1.18 mm shows the best performance in reducing fouling and enhancing pollutant removal. Too small or too large particle size can exacerbate fouling issues.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Environmental Sciences
Shuai Wang, Xiaoxiao Huang, Lijuan Liu, Peng Yan, Youpeng Chen, Fang Fang, Jinsong Guo
Summary: This study revealed the significant contribution of exopolysaccharide (PS) to maintaining the structural stability of aerobic granular sludge (AGS) by affecting hydrophobicity interactions and hydrogen bonds system, which are crucial parameters for gel properties. The hydrolysis of PS led to a decrease in sludge hydrophobicity, granular gel mechanical strength, and an increase in surface free energy, ultimately impacting the granular stability. Additionally, the existence of PS and PN conjugates in the EPS matrix was confirmed, proposing a new insight into the EPS system theory and granular stability mechanism.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Engineering, Environmental
Long Cheng, Mingyu Wei, Gang Guo, Qixing Hu, Bingtang Li, Yifeng Jiang, Zhiquan Hu
Summary: This study investigates the influence of three feeding modes on the formation and stability of aerobic granular sludge (AGS) under exposure to a mixture of antibiotics. The results show that anaerobic plug-flow (APM) and anaerobic mixed-flow (AMM) are able to achieve granulation within a short period, while aerobic feeding mode (AFM) fails to form AGS. AMM outperforms APM and AFM in terms of total phosphorus removal, antibiotic removal, and operational stability under low temperature conditions. The presence of biofilm formers and phosphorus accumulating organisms play important roles in AGS stability and high phosphorus removal in AMM.
CHEMICAL ENGINEERING JOURNAL
(2023)
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
Agricultural Engineering
Xiaojing Yang, Van Bach Nguyen, Ziwen Zhao, Yaoyao Wu, Zhongfang Lei, Zhenya Zhang, Xuan Sinh Le, Hui Lu
Summary: In this study, algal-bacterial aerobic granular sludge was used to remove hexavalent chromium from wastewater. The distribution and mobility of different metals in the granules were examined. The results showed that hexavalent chromium mainly localized in microbial cells and mineral particles, and its mobility decreased during biosorption.
BIORESOURCE TECHNOLOGY
(2022)
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)