Article
Engineering, Environmental
Weida Zeng, Yun Huang, Ao Xia, Qiang Liao, Keming Chen, Xun Zhu, Xianqing Zhu
Summary: By preparing a thermoresponsive surface, the adhesion ability of microalgae cells to the surface can be enhanced, facilitating microalgae biofilm cultivation while not hindering the harvesting process. At higher temperatures, cells are more likely to attach to the surface leading to increased cell coverage rate, while at lower temperatures cells separate more easily and adhesion density decreases.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Agricultural Engineering
N. Hasport, D. Krahe, C. M. Kuchendorf, S. Beier, U. Theilen
Summary: Integration of a photobioreactor for wastewater treatment by microalgae is considered as a cost-efficient and environmentally-friendly alternative for nutrient removal in municipal WWTPs. The high growth rates and biogas yields of algal biomass can greatly improve the WWTP energy balances. This study focuses on temperate climate zones, analyzes the energy potential of microalgae-enhanced wastewater treatment in an existing WWTP in Central Germany, and calculates the shift in the energy balance.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Yanbo Liu, Guoyu Zhang, Weirun Li, Yi Ding, Hong You, Jing Zhu, Haoran Leng, Chi Xu, Xiaodi Xing, Jingyue Xu, Zhipeng Li
Summary: This study applied a natural hybrid microalgae to investigate the mechanism of microalgae biofilm formation and its treatment of mariculture wastewater under different levels of ammonia nitrogen. The results showed that filamentous algae initially attached to the carrier and formed a web-like structure, followed by the involvement of non-filamentous algae and bacteria in biofilm formation. Protein in extracellular polymeric substances (EPS) played a key role in the initial colonization. The study provides a theoretical basis for understanding the mechanism of natural hybrid microalgae biofilm formation and its application in mariculture wastewater treatment.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Biotechnology & Applied Microbiology
Michael Schagerl, Irina Ludwig, Mostafa El-Sheekh, Michael Kornaros, Sameh S. Ali
Summary: The study demonstrates the potential of using dairy wastewater to cultivate Chlorella in flume systems, which can efficiently reduce phosphorus and produce high-value biomass. This has significant implications for cost-effective and efficient wastewater treatment.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2022)
Article
Agricultural Engineering
Kai-Xuan Huang, Ashiwin Vadiveloo, Jin-Long Zhou, Lei Yang, Dong-Zhi Chen, Feng Gao
Summary: Cultivating microalgae in wastewater is an environmentally sustainable approach, but commercial application is challenging due to low biomass output and high harvesting costs. Integrated culture and harvest systems, such as microalgae biofilm and membrane photobioreactor, have been explored to efficiently couple microalgal biomass production with wastewater purification. These systems allow for higher microalgae concentration and more efficient harvesting, improving biomass production and wastewater treatment efficiency.
BIORESOURCE TECHNOLOGY
(2023)
Article
Microbiology
Eric Schaedig, Michael Cantrell, Chris Urban, Xuefei Zhao, Drew Greene, Jens Dancer, Michael Gross, Jacob Sebesta, Katherine J. Chou, Jonathan Grabowy, Martin Gross, Kuldip Kumar, Jianping Yu
Summary: Excess phosphorus in wastewater effluent is a serious threat to aquatic ecosystems. Revolving algal biofilm systems can recover phosphorus from wastewater before discharge. In this study, 101 microalgae strains were isolated from active RAB systems and screened for elevated phosphorus content. Seven strains were found to accumulate at least 50% more polyphosphate than a microalgae consortium from a RAB system. The top strains showed potential for resource recovery and improving phosphorus removal from wastewater.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Engineering, Environmental
Gaozhong Fan, Jie Huang, Xin Jiang, Weile Meng, Rui Yang, Jinsong Guo, Fang Fang, Jixiang Yang
Summary: In this study, a continuous-flow biofilm photobioreactor combined with a membrane bioreactor (MBR) was used for high-saline wastewater treatment. The MBR effectively removed organic matter and converted ammonia nitrogen into nitrate nitrogen, providing favorable water quality for the subsequent MBPBR. The MBPBR achieved high removal efficiencies for nitrate nitrogen and phosphorus, with algae growth contributing significantly to the removal process.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Biotechnology & Applied Microbiology
Georgios Makaroglou, Haridimos Marakas, Stilianos Fodelianakis, Vasiliki Ariadni Axaopoulou, Ino Koumi, Nicolas Kalogerakis, Petros Gikas
Summary: Microalgae are commonly used for animal feed and bioproducts, and growing them on flat biofilms can simplify biomass recovery. By cultivating microalgae in seawater enriched with wastewater, biomass yield can be increased, and treatment effectiveness can be enhanced.
BIOCHEMICAL ENGINEERING JOURNAL
(2021)
Review
Environmental Sciences
Lisa Aditya, T. M. Indra Mahlia, Luong N. Nguyen, Hang P. Vu, Long D. Nghiem
Summary: The review discusses the diversity of microalgae and bacteria and their potential as a consortium for efficient wastewater treatment and nutrient recovery. It emphasizes the use of microalgae biomass derived from wastewater as a renewable feedstock for various applications, and highlights the interactions and characteristics of microalgae in a consortium system.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Agricultural Engineering
Yi Wang, Xinru Zhang, Yuyang Wu, Guangpu Sun, Zeyi Jiang, Siyuan Hao, Shiya Ye, Hu Zhang, Fan Zhang, Xinxin Zhang
Summary: The coculture of microalgae has the potential to promote the growth of microalgae biofilms. This study found that biomass yields can decrease when the biofilm porosity decreases, but can increase when the cocultured biofilms have a uniform microstructure and small cell-clusters. Analysis of cell morphologies and surface properties revealed that cells with small size, spherical shape, and reduced surface polymers can hinder the formation of cell-clusters, thereby promoting biomass yields.
BIORESOURCE TECHNOLOGY
(2024)
Article
Engineering, Biomedical
Monika Krzywicka, Jolanta Szymanska, Szymon Tofil, Anna Malm, Agnieszka Grzegorczyk
Summary: Laser micro-machining on the surface of Ti6Al7Nb alloy can create dimple textures with different depths and densities. The texture parameters influence the surface free energy value and the adhesion of bacteria.
JOURNAL OF FUNCTIONAL BIOMATERIALS
(2022)
Article
Biotechnology & Applied Microbiology
Matthew Kube, Linhua Fan, Felicity Roddick, Rachel Whitton, Marc Pidou, Bruce Jefferson
Summary: This study compared the performance of microalgal systems and macroalgal systems in wastewater treatment and found that macroalgal systems showed better removal efficiency of phosphorus and nitrate, and could also produce more biomass.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2022)
Article
Engineering, Chemical
Wei-Ming Huang, Jih-Heng Chen, Dillirani Nagarajan, Cheng-Kang Lee, Sunita Varjani, Duu-Jong Lee, Jo-Shu Chang
Summary: Taiwan's livestock industry has contributed significantly to agricultural development, but it generates wastewaters that cause water body eutrophication. Bioremediation of high-strength wastewaters using immobilized microalgae has been found to be effective. The study showed that culturing Chlorella sorokiniana AK-1 with Gluconacetobacter xylinus in molasses-based bacterial cellulose resulted in highly porous cellulose, facilitating microalgal attachment and growth. The microalgae immobilized on bacterial cellulose exhibited high removal efficiency for carbon, nitrogen, and phosphorus in dairy manure wastewater.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Article
Environmental Sciences
C. Y. Tong, M. X. Chua, Win Hung Tan, C. J. C. Derek
Summary: Microalgal biofilm, a widely used platform in algae production, nutrient removal, and carbon capture, faces a challenge of exfoliation under shear force. In this study, a biologically-safe coating made of algal extracellular polymeric substances (EPS) was used to secure biofilm cell retention and loading on a commercial microporous membrane. The results showed improved initial cell adhesion and reduced biofilm exfoliation, leading to the stabilization of the biofilm. The application of EPS biocoating has the potential to enhance bioprocess intensifications, although further investigation is needed.
Article
Engineering, Environmental
Beibei Wu, Ting Ran, Sibei Liu, Qian Li, Xiaocai Cui, Yun Zhou
Summary: Non-aeration microalgae-bacteria biofilm has been studied for low cost wastewater treatment. The dynamics of biofilm characteristics and the bioactivity of the biofilm affecting performance and nitrogen metabolisms were investigated in a push-flow microalgae-bacteria biofilm reactor (PF-MBBfR). Results showed that the reactor with an organic loading of 1.27 kg COD/(m3·day) achieved the highest biofilm concentration, density, specific oxygen generation (SOGR) and consumption rates (SOCR), and pollutants removal rates. The use of microalgae in the reactor favored efficient multiple pollutants removal and reduced the emission of dissolved organic nitrogen (DON).
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)