Article
Engineering, Environmental
Luisa Niero, Fernando Morgan-Sagastume, Anders Lagerkvist
Summary: The study demonstrated the impact of temperature, pH, and retention time on the acidogenic fermentation of sewage sludge with wood fly ash added. Higher temperatures and adjusted pH favored hydrolysis, while fermentation producing organic acids was faster at lower temperatures.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Review
Engineering, Environmental
Federico Battista, Giuseppe Strazzera, Francesco Valentino, Marco Gottardo, Marianna Villano, Mariana Matos, Fernando Silva, Maria. A. M. Reis, Joan Mata-Alvarez, Sergi Astals, Joan Dosta, Rhys Jon Jones, Jaime Massanet-Nicolau, Alan Guwy, Paolo Pavan, David Bolzonella, Mauro Majone
Summary: 50.3 million tons of waste are generated annually at urban level in the EU-27, with sewage sludge, organic fraction of municipal solid wastes (OFMSW), and food industrial wastewaters being the major types of waste produced. OFMSW and sewage sludge account for 28% and 23% of the EU-27 waste streams, respectively. Due to their high nutrient content, they are suitable substrates for producing biofuels and bio-based products in a biorefinery loop.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Yanyan Zhang, Jiazhe Bai, Jiane Zuo
Summary: This study used the CE technology to convert food waste and sewage sludge into high-value medium chain fatty acids, achieving the goal of reducing environmental pollution and recovering valuable resources. The experiments showed that a higher concentration of medium chain fatty acids can be obtained when using 100% food waste or 75% food waste with a ratio of 3:1 with sewage sludge. Furthermore, a semi-continuous fermentation experiment indicated the feasibility of long-term medium chain fatty acids production without the need for external electron donors.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Review
Green & Sustainable Science & Technology
Zhenyao Wang, Xuan Li, Huan Liu, Ting Zhou, Zihao Qin, Jinhua Mou, Jing Sun, Siyu Huang, Alex Chaves, Li Gao, Qilin Wang
Summary: Anaerobic fermentation of secondary sludge is crucial for stabilizing, reducing, and utilizing secondary sludge in wastewater treatment plants. Short-chain fatty acids (SCFAs), the end product of anaerobic fermentation, are receiving attention due to their shorter fermentation time, higher economic value, and broader application range. This review summarizes the composition and structure of secondary sludge, tactics for SCFAs accumulation, metabolic pathways of anaerobes in SCFAs production, and the impact of SCFAs composition on subsequent applications. The findings highlight the limitations of secondary sludge in terms of decomposition and SCFAs production, as well as technologies to promote SCFAs accumulation. The review emphasizes the importance of considering individual SCFAs composition for the application of SCFAs derived from anaerobic fermentation of secondary sludge.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Environmental Sciences
C. Vidal-Antich, N. Perez-Esteban, S. Astals, M. Peces, J. Mata-Alvarez, J. Dosta
Summary: The study investigated co-fermentation of waste activated sludge and food waste to produce carboxylic acids, showing higher yields compared to mono-fermentation. Co-fermentation yields increased with higher proportion of food waste in the mixture. pH played a crucial role in co-fermentation performance, with the need for a high enough proportion of sludge to maintain pH above 5.0. Fermenter conditions should prevent the enrichment of acetic acid-consuming microorganisms.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Elin Ossiansson, Frank Persson, Simon Bengtsson, Michael Cimbritz, David J. I. Gustavsson
Summary: This study investigated the primary treatment of municipal wastewater using rotating belt filtration followed by hydrolysis and acidogenic fermentation of the filter primary sludge (FPS) at ambient temperature for one year. The seasonal variations of VFAs, nutrient release, and soluble COD production, as well as microbial community assembly, were assessed, leading to novel findings for fermentation at ambient temperature.
Article
Environmental Sciences
Yufen Wang, Zixin Zhang, Xiaomin Wang, Haixiao Guo, Tingting Zhu, Bing-Jie Ni, Yiwen Liu
Summary: This study proposes a novel and green strategy, percarbonate-strengthened ferrate pretreatment, to enhance the synthesis of short-chain fatty acids (SCFAs) from sewage sludge. The combination of percarbonate and ferrate showed obvious synergistic effects on SCFAs accumulation and sludge reduction. Mechanism explorations demonstrated that the combination enhanced sludge solubilization, substrate biodegradability, and altered the physiochemical properties of sludge to favor organics fermentation. Further investigations revealed that the combination improved key enzyme activities associated with hydrolysis and SCFAs formation, while inhibiting SCFAs consumption. The combination also altered microbial structures and compositions, leading to the enrichment of key microbes that facilitate SCFAs accumulation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Green & Sustainable Science & Technology
Manuel Garcia, Paula Oulego, Mario Diaz, Sergio Collado
Summary: Hydrolysis and solubilization of sewage sludge are important for obtaining small and medium molecules with different applications. Current research focuses on using sludge hydrolysates for non-energy bioproducts like short-chain fatty acids. Main efforts have been on the operational conditions affecting metabolite yields and properties, with biological and thermal pretreatments as common methods.
Article
Environmental Sciences
Lei Wen, Xiao-wu Huang, Xiao-yan Li
Summary: This research investigated the use of thermal hydrolysis (TH) as a pretreatment to enhance fermentation and short-chain fatty acid (SCFA) production from waste sludge. The results showed that TH pretreatment promoted rapid abiotic hydrolysis and increased the production of SCFAs during sludge fermentation. Furthermore, the combination of TH and alkali pretreatment resulted in even higher SCFA production and shorter fermentation time. Microbial community analysis revealed that the microbial consortia in the TH&Alk-FM process performed better in fermentation and SCFA production compared to the NT-FMpH10 process.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Ping Wu, Peng Ding, Chao Zhang, Hong-bo Liu, Chong-jun Chen, He Liu
Summary: This study explored the feasibility of using amino acids as alternative chemical electron donors to produce MCFAs, and proposed a novel two-stage electro-fermentation process. The results showed that this method can convert organic substrates into MCFAs through the synergistic action of microbes.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Xiaoxuan Zhou, Tao Liu, Shengyi Zhang, Bo Kang, Xu Duan, Yuanyuan Yan, Leiyu Feng, Yinguang Chen
Summary: This study investigated the facilitation of Fluorene (Flu) on volatile fatty acids (VFAs) generation during sludge acidogenic fermentation. The results showed that the accumulation of VFAs, especially acetic acid, increased with the addition of Flu, reaching a maximum at a concentration of 200 mg/kg dry sludge. Metagenomics analysis revealed that Flu altered the hydrolysis/acidification process, promoting the conversion of amino acids and monosaccharides into VFAs. This study provides insights into the molecular biology level processes affected by Flu during acidogenic fermentation and is significant for resource recovery of sludge containing persistent organic pollutants.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Chemical
Xuran Liu, Xianli Yang, Jingnan Yang, Yanxin Wu, Dongbo Wang
Summary: This study proposes an environmentally friendly strategy using zero valent iron (ZVI) activating sulfite pretreatment to enhance short chain fatty acids (SCFAs) production from anaerobic fermentation of sewage sludge. The results showed that ZVI-sulfite pretreatment significantly increased SCFAs production and acetate proportion. Mechanism analysis revealed that ZVI-sulfite pretreatment accelerated sludge-floc disintegration and provided more easily- and bio-available substances for functional anaerobes. The pretreatment also enriched functional anaerobes related to hydrolysis, acidogenesis, and acetogenesis, and boosted the functional genes abundance involved in butyrate and acetate formation pathways.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Agricultural Engineering
Xiaodong Zhang, Xiaoding Huang, Xiaoming Li, Jiamin Zhang, Mengge Tang, Xuran Liu, Dongbo Wang, Qi Yang, Abing Duan, Junwu Liu
Summary: This study proposed a citric acid (CA) treatment strategy for improving short-chain fatty acids (SCFAs) production from waste activated sludge (WAS), with the optimum SCFAs yield reaching 384.4 mg COD/g VSS with 0.08 g CA/g TSS addition. The biodegradation of CA contributes to the yield of total SCFAs, especially acetic acid. The presence of CA enhances sludge decomposition, fermentation substrate biodegradability, and the abundance of fermenting microorganisms.
BIORESOURCE TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Jiamin Zhang, Dongbo Wang, Xiaoming Li, Xuran Liu, Qi Yang, Qiuxiang Xu, Guojing Yang, Abing Duan, Yingchun Fang
Summary: This study introduces a new FA pretreatment technique for recovering SCFAs from PS. The results show that FA pretreatment significantly enhances SCFAs production, resulting in a 4.5-fold increase compared to the control group. Mechanism investigations reveal that FA pretreatment accelerates PS solubilization, destroys EPS integrity, and increases easily biodegradable substrates in the fermentation broth. FA also inhibits methane production, leading to further SCFAs accumulation. The conversion of NH4+-N released during fermentation into FA facilitates the transition of wastewater treatment plants operation from linear to circular mode.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Environmental Sciences
Zihao Qiao, Suyun Xu, Wanqiu Zhang, Shuyin Shi, Wei Zhang, Hongbo Liu
Summary: The pretreatment with K2FeO4 can effectively increase the SCFA production and change the distribution of SCFA components during acidogenic fermentation. It can also simultaneously oxidize and degrade part of the antibiotics in the sludge.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2022)
Article
Environmental Sciences
Lei Liang, Jinghuan Luo, Xiangmin Xiao, Jianwei Wang, Meng Hong, Chao Deng, Yu-You Li, Jianyong Liu
Summary: This study found that the addition of granular activated carbon (GAC) at low phosphate concentrations can promote re-granulation of ANAMMOX-HAP granules, avoiding sludge flotation and expanding their application as an inoculum.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Yan Guo, Zibin Luo, Chao Rong, Tianjie Wang, Yu Qin, Taira Hanaoka, Shinichi Sakemi, Masami Ito, Shigeki Kobayashi, Masumi Kobayashi, Yu-You Li
Summary: The study demonstrated that the PNA-HAP process is effective in treating the effluent of AnMBR process, achieving high nitrogen and phosphorus removal efficiency. The sludge analysis revealed various biological activities and chemical crystallization occurring harmoniously in the reactor, with the sludge showing good settling ability and high dispersity.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Review
Engineering, Environmental
Yan Guo, Zibin Luo, Junhao Shen, Yu-You Li
Summary: This paper reviews the main anammox-based processes, discusses their nitrogen removal performance and potential applications, and proposes the concept of integrating different processes to construct an efficient wastewater treatment system.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2022)
Article
Engineering, Environmental
Lan Lin, Ying Song, Yu-You Li
Summary: In this study, the anammox-hydroxyapatite (HAP) process was applied to achieve efficient nitrogen removal at a low temperature. The effect of inorganic carbon (IC) on the process was investigated, and it was found that IC had different effects on nitrogen and phosphorus removal. The phosphorus removal efficiency varied with the Ca/P ratio, and the formation of bio-induced HAP was confirmed using micro characterization technologies.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Green & Sustainable Science & Technology
Jiayuan Ji, Runda Du, Jialing Ni, Yujie Chen, Yisong Hu, Yu Qin, Toshimasa Hojo, Yu -You Li
Summary: The anaerobic membrane bioreactor (AnMBR) has the potential to be a low-cost and energy-producing wastewater treatment process. This study evaluated a constant low-temperature (15 C) AnMBR for the treatment of real municipal wastewater, and demonstrated that it can achieve high removal efficiency and energy production under optimal operational conditions.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Qian Li, Yaqian Liu, Wenyu Gao, Gaojun Wang, Mawuli Dzakpasu, Yu-You Li, Rong Chen
Summary: This study investigated the role of biochar in the anaerobic co-digestion of waste activated sludge and food waste. The results showed that biochar facilitated the co-digestion process, particularly in the syntrophic methanogenesis of volatile fatty acids. The thermodynamic analysis revealed that biochar alleviated limitations imposed by high hydrogen partial pressure and expanded the thermodynamic windows. Furthermore, biochar triggered direct interspecies electron transfer and enhanced interspecies hydrogen transfer, promoting the syntrophic methanogenesis.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Agricultural Engineering
Ziang He, Yuanyuan Ren, Jianyong Liu, Yu-You Li
Summary: The co-digestion performance of mesophilic hollow fiber anaerobic membrane bioreactor (HF-AnMBR) treating high-solid lipids and food waste was studied for 180 days. The organic loading rate (OLR) was increased from 2.33 to 14.64 g-COD/L/d by increasing the lipids/FW ratio. The HF-AnMBR showed stable performance in terms of COD conversion efficiency, sludge growth rate, and concentrations of COD, proteins, and carbohydrates in permeate.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Min Ye, Qian Li, Yu-You Li
Summary: The study evaluated a high-rate anaerobic membrane bioreactor (AnMBR) for treating dairy processing wastewater (DPW). The AnMBR system exhibited superior performance in terms of methanogenic efficiency and bioenergy recovery, with a high net energy potential of 51.4-53.2 kWh/m3. The application of AnMBR led to a significant reduction of 54.1 kg CO2-eq/m3 compared to the conventional process, making it a promising approach for carbon neutrality and a circular economy.
BIORESOURCE TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Liang Zhang, Zhe Tian, Yunzhi Qian, Fuqiang Chen, Yu -You Li, Xueke Wang, Cuilian Fu, Yongzhi Chi
Summary: The long-term treatment of phosphorus-deficient wastewater using a one-stage partial nitrification-anammox (PNA) process may have negative effects on the growth of functional bacteria. A 650-day experiment was conducted using a lab-scale PNA system to study the impact of long-term phosphorus deficiency on nitrogen removal efficiency and sludge characteristics. It was found that phosphorus deficiency led to a decrease in nitrogen removal efficiency, high sludge volume index, and sludge bulking. The abundance of hzsA in flocs decreased significantly. However, the biofilm showed better resistance to phosphorus deficiency. After the addition of PO43--P, the nitrogen removal rate improved, and sludge bulking disappeared.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Environmental Sciences
Jinghuan Luo, Li Jiang, Yuanyuan Wei, Yanmei Li, Guiyu Yang, Yu-You Li, Jianyong Liu
Summary: Alkaline anaerobic fermentation (AAF) coupled with EDTA addition was used to treat metal and EPSs-rich waste activated sludge (WAS). The addition of EDTA significantly promoted sludge solubilization and SCFAs production by chelating metals and destroying EPSs. This study provides an effective method for recovering carbon source from metal and EPSs-rich WAS.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Agricultural Engineering
Jialing Ni, Jiayuan Ji, Yu-You Li, Kengo Kubota
Summary: An anaerobic membrane bioreactor (AnMBR) was used to treat domestic sewage at 15 degrees C under different hydraulic retention time (HRT) conditions (6, 12, 16, and 24 h). The viability of microbial community in anaerobic digestion was assessed using Propidium monoazide (PMA)-PCR, which targeted microorganisms with intact cell membranes. The study found that a 6-hour HRT resulted in poor treatment performance, with low chemical oxygen demand removal efficiency and high mean trans-membrane pressure and flux. PMA-PCR combined with next-generation sequencing provided better identification of microbial changes compared to conventional 16S rRNA gene sequencing.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Chihao Lin, Yanxu Liu, Yu-You Li, Jianyong Liu
Summary: This study proposes high-salinity treatment as a novel strategy for inactivating nitrite-oxidising bacteria (NOB) and achieving stable partial nitritation (PN). The study found that NOB are more sensitive to high salinity than ammonia-oxidising bacteria (AOB), and increasing salinity inhibited nitrification. After high-salinity treatment, nitrite accumulation rate (NAR) was above 33% during nitrification. A novel process for achieving mainstream PN was proposed and evaluated based on the results.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Yunzhi Qian, Shilong He, Fuqiang Chen, Junhao Shen, Yan Guo, Yu Qin, Yu-You Li
Summary: This study evaluated the functional activity and microbial structure of a pre-denitrification and single-stage partial nitritation/anammox process (DB-SNAP) coupled system for effectively treating swine manure digestate (SMD). The results showed that the pre-denitrification reactor increased the nitrogen removal efficiency (NRE) by 5%, resulting in an average NRE of 96%. The DB-SNAP and nitrogen-limited strategy facilitated the rapid adoption of anammox bacteria (AnAOB) in the SMD.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Mengni Tao, Yu Kong, Zhaoqian Jing, Lin Guan, Qiusheng Jia, Yiwei Shen, Meijia Hu, Yu -You Li
Summary: Acorus calamus is recycled as an additional carbon source in microbial fuel cell-constructed wetlands for efficient nitrogen removal of low carbon wastewater. Alkali-pretreatment cleaves the benzene rings in dominant released organics, producing chemical oxygen demand of 164.5 mg per gram of A. calamus. Adding pretreated biomass in the anode of MFC-CW achieves maximum total nitrogen removal of 97.6% and power generation of 12.5 mW/m2.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Jiayuan Deng, Xiangmin Xiao, Yu-You Li, Jianyong Liu
Summary: This study used the innovative low-carbon nitrogen removal process of partial denitrification-anammox (PD-A) to simultaneously treat PPCCW and municipal wastewater pre-treated with 10 mg/L Fe3+. The results showed that the effluent had a total nitrogen concentration lower than 10 mg/L, with a removal efficiency of 79.67 +/- 3.48%. The dominant anammox genus was unclassified_f_Brocadiaceae, indicating the stability of the reactor. Hydrolytic acidifying bacteria SBR1031 and Bacillus increased substantially after feeding with actual wastewater, leading to increased removal efficiencies of organic material and nitrogen, suggesting a synergistic effect with PD-A bacteria. Finally, a novel wastewater treatment process that fully recovers carbon, phosphorus, and water was proposed.
BIORESOURCE TECHNOLOGY
(2023)
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)
