Article
Agricultural Engineering
Yan Guo, Yunzhi Qian, Junhao Shen, Yu Qin, Yu-You Li
Summary: This research successfully achieved synchronous nitrogen elimination and phosphorus recovery through the novel one-stage partial nitritation/anammox (PN/A)-hydroxyapatite (HAP) crystallization process. Within three months, high nitrogen removal rate and phosphorus removal efficiency were achieved, indicating the potential of this process in actual wastewater treatment. The coordination between biomass and mineral played an important role, providing guidance for practical application.
BIORESOURCE TECHNOLOGY
(2022)
Review
Environmental Sciences
Pengcheng Wang, Bin Lu, Xiaoji Liu, Xiaoli Chai
Summary: Based on the reviews of the AnGS formation mechanism, micro-nuclei were found to be important in the granulation process of AnGS, and adding micro-nuclei directly to the reactor may be an efficient way to accelerate the formation of AnGS. This paper summarizes and discusses the use of inert particles, multivalent positive ions, and broken granule sludge as micro-nuclei to accelerate AnGS granulation. Possible research directions for accelerating AnGS formation by dosing micro-nuclei were also highlighted. The paper aims to provide a possible pathway for the rapid start-up of AnGS systems and references for the optimization and promotion of the AnGS process.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Dongdong Xu, Jiahui Fan, Wenji Li, Wenda Chen, Chao Pan, Da Kang, Yiyu Li, Shengdao Shan, Ping Zheng
Summary: The study investigated the correlation between permeability and granule size of Anammox granules, finding a negative relationship between them. With the increase of granule size, the pore structure varied significantly, affecting the fluid collection efficiency.
Article
Agricultural Engineering
Qiang He, Jinjin Liu, Yongzhen Peng, Xiyao Li, Qiong Zhang
Summary: The use of sludge alkaline fermentation promoted nitrogen removal and enrichment of anammox bacteria in wastewater with low carbon-to-nitrogen (C/N) ratio. This system saves energy and reduces consumption significantly.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Lai Peng, Sheng-Qiang Fan, Guo-Jun Xie, Bing-Jie Ni, Yiwen Liu, Yifeng Xu, Bing-Feng Liu, De-Feng Xing, Hong-Jun Han, Shaoxian Song, Nan-Qi Ren
Summary: The granular bioreactor is an ideal choice for achieving coupled nitrate/nitrite dependent denitrifying anaerobic methane oxidation and anaerobic ammonium oxidation processes. A model framework was developed to understand the mechanisms and provide suggestions for process optimization, showing good predictive ability and consistency with experimental observations. Control of hydraulic retention times and granule sizes can impact microbial abundance and community distribution, leading to reduced operational costs in treatment lines.
CHEMICAL ENGINEERING JOURNAL
(2021)
Review
Engineering, Environmental
Xiaochuan Ran, Mingda Zhou, Tong Wang, Weigang Wang, Sheena Kumari, Yayi Wang
Summary: This article provides an overview of nitrogen-removal granular sludge (NRGS) technology, with a focus on its characterization. The integrated nitrogen transformation pathways and performance of NRGS in treating various wastewaters are discussed. NRGS properties are categorized and corresponding characterization technologies are presented. Future prospects for understanding and applying NRGS technology are proposed.
Article
Agricultural Engineering
Jiarui Fan, Rui Du, Qingtao Liu, Cong Li, Yongzhen Peng
Summary: Microbial interactions between Anammox and heterotrophic bacteria were analyzed in this study. The study found that the proportion of Anammox microorganisms varied in different granule sizes and heterotrophs could stimulate Anammox activity through organic carbon. The results indicate that efficient nitrogen removal can be achieved by regulating the distribution of sludge size and organic carbon source.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Hyungmin Choi, Jinsu Kim, Jihun Park, Changsoo Lee
Summary: Even small fluctuations in wastewater's organic matter significantly affect the structure and function of anammox microbial communities. Continuous organic load at 30 mg COD/L improved nitrogen removal efficiency without compromising anammox performance. Higher levels of continuous organic load caused inhibition of anammox activity, while transient organic load's inhibitory effect was fully reversed within one day. Loading an appropriately low amount of organic matter can improve the nitrogen removal performance of anammox granular sludge without sacrificing anammox activity and granule stability under mainstream conditions.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Yujie Chen, Yan Guo, Gaoxuefeng Feng, Kampachiro Urasaki, Guangze Guo, Yu Qin, Kengo Kubota, Yu-You Li
Summary: The combination of Anammox and hydroxyapatite (HAP) granules has advantages in nitrogen and phosphorus removal and sludge settleability. This study explores the key factors for stable and efficient nitrogen removal in a one-stage partial nitritation/anammox (PNA) process with HAP-based granules.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Ya-Fei Cheng, Zheng-Zhe Zhang, Wen-Jie Ma, Gui-Feng Li, Bao-Cheng Huang, Nian-Si Fan, Ren-Cun Jin
Summary: The introduction of biodegradable carbon sources affects the performance of the mainstream anammox process. Glucose and acetate reduce the contribution of anammox to nitrogen removal. Granule-based systems have advantages in maintaining functional balance, but targeted biomass retention strategies are needed.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Lan Lin, Zibin Luo, Kyuto Ishida, Kampachiro Urasaki, Kengo Kubota, Yu-You Li
Summary: In this study, the start-up period of the anammox process was investigated using nitrification-denitrification sludge, and a successful start-up was achieved. The results showed high efficiency in nitrogen removal and significant improvements in granule properties, indicating the feasibility and importance of the anammox process for large-scale applications and sludge utilization.
Article
Agricultural Engineering
Xiaofei Gong, Liang Zhang, Qingteng Gong, Xuefan Liu, Xiyao Li, Qiong Zhang, Yongzhen Peng
Summary: In this study, a novel strategy using activated sludge as inoculum and biocarrier in a dynamic fixed-bed reactor was proposed, which successfully cultivated and enriched AnAOB. With this strategy, excellent performance was achieved during the 115-day operation.
BIORESOURCE TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Jaecheul Yu, Yeonju Kim, Jeongmi Kim, Soyeon Jeong, Seongjae Park, Taeho Lee
Summary: Anaerobic ammonium oxidation (anammox) is a nitrogen removal process with potential benefits, but maintaining stability is challenging. This study investigated the use of a respirometer for analyzing specific anammox activity (SAA), and found that the results were similar to those obtained using traditional methods. The simple SAA analysis provided by the respirometer can improve the operation, maintenance, and management of the anammox process.
APPLIED SCIENCES-BASEL
(2022)
Article
Environmental Sciences
Xiao-Lin Ma, En-Jing He, Feng-Ting Cao, Yang-Yang Fan, Xiang-Tong Zhou, Xiang Xiao
Summary: This study investigated the impact of ambient concentrations of zinc oxide nanoparticles (nZnO) on denitrification performance and microbial community in activated sludge. Results showed that a low concentration of nZnO can enhance nitrogen removal and improve sludge flocculation. Microbial analysis revealed an increase in the relative abundance of denitrifying bacteria in the presence of nZnO.
Article
Agricultural Engineering
Hao Jiang, Xiyao Li, Fangzhai Zhang, Zhong Wang, Shang Ren, Jingang Qiu, Shuying Wang, Yongzhen Peng
Summary: This study established a novel step-draining based partial nitrification-denitrification and Anammox system for advanced nitrogen removal from mature landfill leachate. By separating partial nitrification and denitrification through step-draining, a high nitrogen removal rate was achieved. The NH4+ to NO2- ratio could be easily controlled by adjusting the volume ratio of effluents from the PND reactor. The presence of Brocadia, Kuenenia, and Jettenia in the AMX reactor contributed significantly to nitrogen removal.
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)