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
Environmental Sciences
Amanda Dias, Alisson Carraro Borges, Andre Pereira Rosa, Marcio Aredes Martins
Summary: The study evaluated the efficiency of biomass separation from Scenedesmus obliquuos using coagulation-flocculation with natural coagulants like Moringa oleifera and Guazuma ulmifolia. Results showed promising potential for these natural coagulants in reducing the use of synthetic or metallic products in microalgae recovery processes.
Article
Environmental Sciences
Byung Hun Park, Sehui Kim, A. Young Seo, Tai Gyu Lee
Summary: The study aimed to find the optimal conditions for removing anionic surfactants in wastewater using the coagulant-flocculant method. Through experiments, it was determined that the optimal conditions include a coagulant concentration of 5%, a flocculant concentration of 0.1%, and a pH of 10. Additionally, the study concluded that the coagulant concentration, flocculant concentration, and pH are significant independent variables affecting surfactant removal.
Article
Environmental Sciences
Jingjing Sun, Shuhong Jiang, Libin Yang, Huaqiang Chu, Bo-Yu Peng, Shaoze Xiao, Yayi Wang, Xuefei Zhou, Yalei Zhang
Summary: Wastewater recycling addresses microalgae biomass commercialization challenge by allowing efficient resource recovery. This study compared three conventional harvesting methods – centrifugation, microfiltration, and flocculation sedimentation – to select a suitable method for microalgal wastewater recycling. Microfiltration resulted in the least accumulated substances in recycled wastewater, followed by centrifugation and flocculation sedimentation. After four cultivation batches, microalgal biomass harvested from centrifugation and microfiltration wastewater was 21.26% and 13.54% higher than that from flocculation wastewater, respectively. Lipids, carbohydrates, and pigments all increased to varying degrees. Flocculation sedimentation was not suitable due to low residual nutrients, high salinity, and excessive algal organic matter inhibiting microalgae growth. Under phytohormone regulation, microalgae increased energy reserves, enhanced photosynthesis, and improved defense against abiotic stress. This study provides scientific support for selecting suitable harvesting technology for microalgal wastewater recycling.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Agricultural Engineering
Mingxiang Qv, Dian Dai, Dongyang Liu, Qirui Wu, Chunming Tang, Shuangxi Li, Liandong Zhu
Summary: In this study, a microalgae-bacteria symbiosis (ABS) system was developed for pollutants removal by co-culturing Chlorella sorokiniana with activated sludge, and the interaction mechanism was investigated. The ABS system achieved almost complete removal of ammonia nitrogen, with removal efficiencies of 65.3% for total nitrogen and 42.6% for total phosphorus. Brevundimonas greatly promoted microalgal biomass growth and microalgae contributed to the increase in the abundance of Dokdonella and Thermomonas, facilitating nitrogen removal. The study also identified key extracellular polymeric substances for the formation of flocs by microalgae and activated sludge.
BIORESOURCE TECHNOLOGY
(2023)
Article
Engineering, Environmental
Yutao Zhang, Jianhai Zhao, Zhaoyang Liu, Sufeng Tian, Jingfang Lu, Rong Mu, Hongying Yuan
Summary: In this study, a magnetic magnesium hydroxide coagulant was prepared to effectively remove polyethylene microplastics from wastewater. The highest removal efficiency of microplastics reached 87.1% when the ratio of Mg2+ to OH- was 1:1.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Engineering, Environmental
Zhipeng Chen, Shuang Qiu, Ziwei Yu, Mengting Li, Shijian Ge
Summary: This study highlights the crucial role of exoproteins in microalgal self-flocculation, showing that high light intensity conditions can enhance self-flocculation efficiency by promoting the enrichment and rearrangement of PN in EPS. Furthermore, specific PN over-expression, Algal-CAMs, and metal-ion-binding PN were identified as key contributors to facilitating cell adhesion and bridging.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
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)
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
Environmental Sciences
Luong N. Nguyen, Lisa Aditya, Hang P. Vu, Abu Hasan Johir, Lucia Bennar, Peter Ralph, Ngoc B. Hoang, Jakub Zdarta, Long D. Nghiem
Summary: Algae cultivation for wastewater treatment is gaining more attention due to its ability to recover nutrients and capture CO2 in the circular economy concept. However, there are technical and economic challenges in implementing algae-based wastewater treatment due to the complexity of wastewater and algal ecological characteristics. The use of phototrophic algae in this process faces challenges in supplying CO2 and illumination. Future research should focus on improving algae growth rate, environmental tolerance, and downstream processing, as well as analyzing biomass for carbon credit assessment and economic values.
CURRENT POLLUTION REPORTS
(2022)
Article
Environmental Sciences
Amina Adedoja Owodunni, Suzylawati Ismail, Niyi Gideon Olaiya
Summary: This study explores the use of natural coagulants derived from leguminous and fruit seeds for water treatment. The results show that pigeon pea extracted with distilled water has the highest turbidity removal rate of 81.12%, while date palm extracted with NaCl solution has the highest removal rate of 94.62%. The optimal doses for green beans, tamarind indica, pigeon pea, and date palm are 50, 40, 10, and 70 mL/L, respectively.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Microbiology
Anna Civzele, Linda Mezule
Summary: Tertiary wastewater treatment with microalgae using bio-flocculation instead of mechanical harvesting has shown high efficiency and wide applicability, which is crucial for enhancing technological competitiveness. In initial experiments, harvesting microalgae from wastewater resulted in removal efficiencies of 73-93% within 24 hours and up to 95% within 48 hours. The cost-effective and environmentally sustainable bio-flocculation technology has significant importance in reducing operating costs.
Article
Green & Sustainable Science & Technology
Najeeha Mohd Apandi, Paran Gani, Norshuhaila Mohamed Sunar, Radin Maya Saphira Radin Mohamed, Adel AlGheethi, Affah Mohd Apandi, Ramathasan Nagarajah, Noor Afifee Raihan Shaari, Kelly Cheong, Roshanida A. Rahman
Summary: This study investigated the production of Scenedesmus sp. in wet market wastewater as an ingredient for fish feeds. The potential of two natural plant-based coagulants for harvesting microalgae Scenedesmus sp. was compared. The results showed that both coagulants had high harvesting efficiency. Scenedesmus sp. was found to effectively remove heavy metals without exceeding the maximum concentration set by regulations. The biomass contained valuable components such as protein and fatty acid methyl ester.
Review
Environmental Sciences
Alireza Fallahi, Fariba Rezvani, Hashem Asgharnejad, Ehsan Khorshidi Nazloo, Nima Hajinajaf, Brendan Higgins
Summary: Nitrogen and phosphorus pollution can lead to eutrophication which disrupts ecosystems. Wastewater treatment using microalgae-bacteria consortia can enhance nutrient removal efficiency. Understanding the mechanisms of interaction between microalgae and bacteria can improve nutrient transformation and recovery, with the nitrogen source in wastewater playing a crucial role in their interaction.
Article
Multidisciplinary Sciences
Gaik Eng Loo, Lee Muei Chng, Swee Pin Yeap, JitKang Lim, Derek Juinn Chieh Chan, Sim Siong Leong, Pey Yi Toh
Summary: Microalgae bio-treatment of synthetic fertilizer wastewater is effective due to their photosynthetic capabilities, but harvesting remains a challenge due to small size and repulsion of microalgae cells. The magnetic-aided-embedding-flocculation strategy can significantly improve harvesting efficiency.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Environmental
Fatima Zahra Mennaa, Zouhayr Arbib, Jose Antonio Perales
Article
Environmental Sciences
Allan Thomas Williams, Peter Randerson, Carlo Di Giacomo, Giorgio Anfuso, Ana Macias, Jose Antonio Perales
MARINE POLLUTION BULLETIN
(2016)
Article
Biotechnology & Applied Microbiology
Peter S. C. Schulze, Hugog. C. Pereira, Tamara F. C. Santos, Lisa Schueler, Rui Guerra, Luisa A. Barreira, Jose A. Perales, Joao C. S. Varela
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2016)
Article
Environmental Sciences
Zouhayr Arbib, Ignacio de Godos, Jesus Ruiz, Jose A. Perales
SCIENCE OF THE TOTAL ENVIRONMENT
(2017)
Article
Engineering, Environmental
B. Diaz-Garduno, M. G. Pintado-Herrera, M. Biel-Maeso, J. J. Rueda-Marquez, P. A. Lara-Martin, J. A. Perales, M. A. Manzano, C. Garrido-Perez, M. L. Martin-Diaz
Article
Biotechnology & Applied Microbiology
P. D. Alvarez-Diaz, J. Ruiz, Z. Arbib, J. Barragan, M. C. Garrido-Perez, J. A. Perales
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2017)
Article
Environmental Sciences
B. Diaz-Garduno, J. A. Perales, C. Garrido-Perez, M. L. Martin-Diaz
ENVIRONMENTAL POLLUTION
(2018)
Article
Green & Sustainable Science & Technology
Esteban Serrano Leon, Jose Antonio Perales Vargas-Machuca, Enrique Lara Corona, Zouhayr Arbib, Frank Rogalla, Maikel Fernandez Boizan
JOURNAL OF CLEANER PRODUCTION
(2018)
Article
Environmental Sciences
B. Diaz-Garduno, J. A. Perales, M. Biel-Maeso, M. G. Pintado-Herrera, P. A. Lara-Martin, C. Garrido-Perez, M. L. Martin-Diaz
SCIENCE OF THE TOTAL ENVIRONMENT
(2018)
Article
Environmental Sciences
Sergio Gutierrez-Alfaro, Juan J. Rueda-Marquez, Jose A. Perales, Manuel A. Manzano
SCIENCE OF THE TOTAL ENVIRONMENT
(2018)
Article
Engineering, Environmental
Elena Villar-Navarro, Rosa M. Baena-Nogueras, Maria Paniw, Jose A. Perales, Pablo A. Lara-Martin
Article
Environmental Sciences
Elena Villar-Navarro, Carmen Garrido-Perez, Jose A. Perales
Summary: The feasibility of using microalgae biotechnology to improve water quality and produce biomass to replace fish meal or fish oil in two marine fish farms was studied. Results showed that RAS systems enriched with trace metals generate viable streams for microalgae growth, with potential for microalgae biomass to be used as a substitute for fish meal in sea bass feed.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Biotechnology & Applied Microbiology
Elena Villar-Navarro, Carmen Garrido-Perez, Jose A. Perales
Summary: This study investigated the use of six microalgae species for treating effluent from a marine fish farm. Results showed variations in biomass productivity, nutrient removal rate, and biomass composition among different species, highlighting the potential for effective wastewater treatment using microalgae.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2021)
Article
Chemistry, Analytical
Julio Sanchez-Nieva, Jose Antonio Perales, Juan Maria Gonzalez-Leal, Elisa Rojo-Nieto
ANALYTICAL METHODS
(2017)
