Article
Engineering, Environmental
Bingcong Zhang, Bifei Mao
Summary: In this study, a novel magnetic starch-grafted-cationic polyacrylamide composite (MAG@ST-g-CPAM) was developed as a flocculant for algae harvesting. The efficiency of the composite was compared to other flocculants, and the optimal feeding ratios and impacting factors were determined. The MAG@ST-g-CPAM flocculant showed superior harvesting efficiencies and facilitated water reuse through the elimination of fulvic acids.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Environmental Sciences
Hang P. Vu, Luong N. Nguyen, Minh T. Vu, Leen Labeeuw, Benjamin Emmerton, Audrey S. Commault, Peter J. Ralph, T. M. Mahlia, Long D. Nghiem
Summary: This study demonstrates the high efficiency of polyacrylamide polymers and alkaline flocculation for Porphyridium purpureum in seawater medium. Polymer flocculation achieved over 99% efficiency through charge neutralization and bridging mechanism, while alkaline flocculation required higher doses for similar results. The use of polymers compromised cell integrity more significantly compared to alkaline bases, indicating a trade-off between efficiency and biomass quality.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Agricultural Engineering
Rohan Sharma, Myeongsub Kim
Summary: Microalgae biofuels have the potential to meet national energy demands due to their high oil-to-fuel yield. However, limited harvesting efficiency is a challenge. In this study, a spiral microalgae separator was developed and selected parameters of the algal medium were manipulated to achieve more concentrated algal slurry. Concentration, temperature, and pH manipulation were found to improve separation efficiency.
BIOMASS & BIOENERGY
(2022)
Article
Energy & Fuels
Shamshad Khan, M. Naushad, Jibran Iqbal, Chinna Bathula, Gaurav Sharma
Summary: Biofuel derived from microalgae has become an environmentally friendly alternative to conventional fossil fuels, but there are still technical and economic challenges in mass production and harvesting. This review discusses the difficulties in establishing an integrated system for large-scale microalgal production and harvesting, as well as the advancements in harvesting methods and opportunities for genetic engineering.
Article
Environmental Sciences
Jiawen He, Wanqing Ding, Wei Han, Yidi Chen, Wenbiao Jin, Xu Zhou
Summary: The bacterium Citrobacter W4 isolated from microalgae sewage culture system exhibited high flocculating activity against Chlorella pyrenoidosa. Optimization of operation parameters under outdoor conditions resulted in efficient harvesting with Citrobacter W4. The microbial community analysis revealed the dominance of Citrobacter W4 in the harvesting process, with active substances mainly composed of protein, polysaccharides, and carboxylic acid promoting flocculation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Valentin P. Beyer, Jonas Blockx, Ayessa Pires Maciel, Sakshi Tyagi, Irem Demir-Yilmaz, Cecile Formosa-Dague, Koenraad Muylaert, Wim Thielemans
Summary: In this study, we synthesised a library of PDMAEMA polymers and used them for flocculation of Chlorella vulgaris. The dose required for flocculation was independent of polymer molecular weight, and flocculation primarily occurred through charge neutralisation. High molecular weight PDMAEMA caused surface charge reversal and dispersion restabilization, while low molecular weight PDMAEMA did not.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Agricultural Engineering
Anil Kumar Patel, Prashant Kumar, Chiu-Wen Chen, Vaibhav Sunil Tambat, Thanh-Binh Nguyen, Chih-Yao Hou, Jo-Shu Chang, Cheng-Di Dong, Reeta Rani Singhania
Summary: The study aims to develop magnetite nanoparticles (MNPs) and utilize their high reusability potential to reduce the harvesting cost of microalgae biomass. Experimental results show that MNPs can achieve high harvesting efficiency under specific conditions and can be recovered and reused through alkaline treatment for multiple cycles. This study provides a cost-effective harvesting method for commercial-scale algae biorefining in the future.
BIORESOURCE TECHNOLOGY
(2022)
Article
Biotechnology & Applied Microbiology
Zijun Yang, Jun Hou, Lingzhan Miao
Summary: This study compared the harvesting performance and mechanisms of four natural flocculants on microalgae cells, with Tanfloc showing the highest efficiency and cost-effectiveness in harvesting microalgae.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2021)
Review
Engineering, Chemical
Shifa M. R. Shaikh, Mohammad K. Hassan, Mustafa. S. Nasser, Sami Sayadi, Ahmad I. Ayesh, Vivek Vasagar
Summary: This paper provides an overview of the latest progress in harvesting microalgae suspensions using polyacrylamide flocculants, examining the impact of polyacrylamide characteristics on flocculation efficiencies and evaluating the effects of culture medium properties on polyacrylamide-induced flocculation. Existing pilot-scale and large-scale polyacrylamide-based flocculation studies are explored while identifying research gaps, key challenges, and future prospects for optimizing microalgae flocculation studies.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Environmental
Lin Li, Wenhong Chen, Yuyu Wang, Yao Zhang, Huaimin Chen
Summary: Hydrodynamic turbulence enhances the efficiency of autoflocculation in Chlorella vulgaris by increasing the probability of cell contact and accumulation of EPS. However, excessive shear strength and energy dissipation efficiency can lead to the disaggregation of algal flocs. This study demonstrates that hydrodynamic control can be a cost-effective approach for harvesting algae products with high separation efficiency.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Fisheries
Marta P. Sanderson, Karen L. Hudson, Lauren S. Gregg, Amanda B. Chesler-Poole, Jessica M. Small, Kimberly S. Reece, Ryan B. Carnegie, Juliette L. Smith
Summary: This study investigated the water treatment and algal toxin detection in hatcheries on the East Coast of the US. The results showed the presence of various algal toxins in hatchery water, despite the absence of visible harmful algal bloom cells. It was also found that sand filtration and activated charcoal filtration successfully reduced the toxin concentrations in the source water.
Review
Environmental Sciences
Ayusmita Ray, Sanjukta Banerjee, Debabrata Das
Summary: The review article discusses the current status of using bio-flocculation technology for harvesting microalgae, highlighting the advantages of bio-flocculation and various microbial strains as potential bio-flocculants. Additionally, it suggests that the key to selecting an appropriate harvesting technique depends on the final utilization of the harvested biomass.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Natasha Laraib, Ali Hussain, Arshad Javid, Tahir Noor, Qurat-ul-Ain Ahmad, Asma Chaudhary, Maleeha Manzoor, Muhammad Akmal, Syed Mohsin Bukhari, Waqas Ali, Tae Jin Choi, Peer M. Schenk
Summary: Microalgae are being increasingly studied due to their potential applications in biofuel production, but the high cost of harvesting is a major barrier. Different harvesting techniques should be combined based on the characteristics of the microalgae and production medium to achieve economically viable results.
ENVIRONMENT DEVELOPMENT AND SUSTAINABILITY
(2022)
Review
Agricultural Engineering
Zhiyong Liu, Nahui Hao, Yuyong Hou, Qing Wang, Qingling Liu, Suihao Yan, Fangjian Chen, Lei Zhao
Summary: Microalgae are being recognized as a promising source for meeting global demands sustainably. However, the high energy consumption for harvesting is a major obstacle. This review provides an overview of microalgae harvesting technologies, focusing on the latest advances in flocculation techniques. These methods have been applied in biodiesel production, food processing, nutraceuticals, and wastewater treatment. Large-scale harvesting faces challenges due to high costs, but cost-effective strategies such as resource utilization and extracellular polymeric substance-induced flocculation technology can be explored for efficient microalgal harvesting.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Kai-Xuan Huang, Ashiwin Vadiveloo, Hua Zhong, Chen Li, Feng Gao
Summary: The study found that CTS@FeBC had significantly higher efficiency in harvesting microalgae compared to BC and FeBC, and it was more effective for harvesting microalgae under acidic and alkaline conditions.
BIORESOURCE TECHNOLOGY
(2023)
Article
Biotechnology & Applied Microbiology
Rafael Sales, Roberta Cecilia Silfronio Melo, Ramon Maciel de Moraes Junior, Rayane Cristine Santos da Silva, Ronaldo Olivera Cavalli, Daniela Maria do Amaral Ferraz Navarro, Lilia Pereira de Souza Santos
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2016)
Article
Biochemistry & Molecular Biology
Rafael Sales, Paulo Cesar Abreu
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
(2015)
Article
Agricultural Engineering
Ricardo Bessler Koenig, Rafael Sales, Fabio Roselet, Paulo Cesar Abreu
BIOMASS & BIOENERGY
(2014)
Article
Biotechnology & Applied Microbiology
Rafael Sales, Roberto Bianchini Derner, Monica Yumi Tsuzuki
JOURNAL OF APPLIED PHYCOLOGY
(2019)
Article
Biotechnology & Applied Microbiology
Rafael Sales, Maria del Carmen Ceron-Garcia, Elvira Navarro-Lopez, Cynthia Victoria Gonzalez-Lopez, Monica Yumi Tsuzuki, Francisco Gabriel Acien-Fernandez, Francisco Javier Alarcon-Lopez, Emilio Molina-Grima
JOURNAL OF APPLIED PHYCOLOGY
(2020)