Article
Food Science & Technology
Yuvaraj Ravikumar, Sirajunnisa Abdul Razack, Lakshmi Narayanan Ponpandian, Guoyan Zhang, Junhua Yun, Jiaqi Huang, Donghun Lee, Xiaolan Li, Yuan Dou, Xianghui Qi
Summary: This article summarizes the potential of using metabolic and genetic engineering methods to improve yeast strains for increased production of D-arabitol. It also highlights the importance of understanding the metabolic pathway that regulates D-arabitol synthesis and optimizing the fermentation process.
TRENDS IN FOOD SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Lalit R. Kumar, Sravan K. Yellapu, R. D. Tyagi, Patrick Drogui
Summary: This study conducted fed-batch fermentation at pH 6.0 using municipal sludge and crude glycerol to cultivate Y. lipolytica SKY7, resulting in high biomass and lipid concentration. The biodiesel produced from sludge-cultivated YL had a similar fatty acid ester profile as vegetable oil.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Energy & Fuels
Zhiwei Gong, Man Zhao, Qiaoning He, Wei Zhou, Mou Tang, Wenting Zhou
Summary: This study investigated the lipid production of Cutaneotrichosporon oleaginosum from glucose, glycerol, and their mixture. The co-existence of glucose and glycerol improved lipid productivity, possibly due to the enhanced substrate transportation efficiency. Additionally, co-utilization of waste paper enzymatic hydrolysates and crude glycerol resulted in high lipid content and yield.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Environmental Sciences
Yuanying Ma, Fang You, David Parry, Anja Urban, Longbin Huang
Summary: The present study aimed to characterize the adaptive growth and acidogenic fermentation performance of haloalkaliphilic bacteria sourced from field biofilms colonizing seawater-treated bauxite residue. The study found that these bacteria groups were able to adapt to different alkaline pH and saline conditions and produce organic acids, which were correlated to carbohydrate supply. They could also up-regulate their phosphatase activity to mineralize organic phosphorus and adapt to different nutrient conditions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Energy & Fuels
Miguel Capilla, Alejo Valles, Pau San-Valero, Francisco Javier Alvarez-Hornos, Carmen Gabaldon
Summary: This study developed a novel fermentation strategy to improve xylose conversion in biofuel production from lignocellulosic wastes. By controlling pH(min)>4.8 and using a co-culture of Clostridium acetobutylicum and Saccharomyces cerevisiae, sugar consumption and solvent production were significantly enhanced.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Biotechnology & Applied Microbiology
Qingtao Gao, Kai Li, Ruqing Zhong, Cheng Long, Lei Liu, Liang Chen, Hongfu Zhang
Summary: This study investigated the effect of adding glycerol to the inoculum on in vitro fermentation and the use of an enhanced buffer solution to maintain pH stability. The results showed that adding glycerol decreased the pH of the fermentation broth, but the modified medium could alleviate this decrease. Additionally, adding glycerol changed the fermentation patterns and altered the composition of the microbial community.
FERMENTATION-BASEL
(2022)
Article
Chemistry, Physical
Yanan Yin, Jianlong Wang
Summary: This study used PICRUSt to analyze the changes in microbial community functions in a biohydrogen production system, revealing that ionizing radiation pretreatment altered metabolic flux and decreased homoacetogenic gene, leading to increased hydrogen production, but also resulted in reduced carbohydrate metabolism.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Environmental
Qingting Wang, Kun Dai, Jie Tang, Sidi Hong, Sijie Zheng, Ting Sun, Raymond Jianxiong Zeng, Fang Zhang
Summary: This study investigated the production of caproate from xylose through mixed culture fermentation at a low temperature. Enriched bacteria and enzymes involved in caproate production were identified. These findings contribute to a better understanding of low-temperature caproate production.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2023)
Article
Agricultural Engineering
Yang Yu, Shuangmei Liu, Yuwei Zhang, Minrui Lu, Yuanyuan Sha, Rui Zhai, Zhaoxian Xu, Mingjie Jin
Summary: This study investigated the sugar consumption and inhibitor tolerance characteristics of Trichosporon dermatis 32,903, and developed a sugar-targeted utilization and cyclic fermentation strategy based on these characteristics, which greatly enhanced lipid production efficiency.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
Wenqian Zhao, Xiaodong Zhang, Yanpeng Cai, Shan Zhao, Shuguang Wang
Summary: MNZ inhibits anaerobic fermentation more strongly in mesophilic conditions than in thermophilic conditions. It can be completely removed through biodegradation. MNZ reduces the abundance of hydrogen-producing bacteria and its inhibition on anaerobic fermentation is reversible.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
Joanna Chwialkowska, Lukasz Smaga, Piotr Oleskowicz-Popiel
Summary: Open culture fermentation (OCF) is a promising technology for converting different organic waste into carboxylic acids (CAs) and alcohols in biorefinery. This study found that for complex substrates like raw maize silage, OCF can achieve the highest CA yield, while for monosaccharides, co-fermentation (glucose/galactose) is the most efficient process.
BIOSYSTEMS ENGINEERING
(2021)
Review
Biochemical Research Methods
Roman Moscoviz, Robbert Kleerebezem, Julius Laurens Rombouts
Summary: In order to reduce costs and increase ethanol production, low-value non-sterile feedstocks can be used, and measures such as acid washing, maintaining low pH, and microaerobic conditions during fermentation can be employed. Creating symbiotic communities of lactic acid bacteria and ethanol producers can lead to more robust and competitive ethanol yields.
CURRENT OPINION IN BIOTECHNOLOGY
(2021)
Article
Biotechnology & Applied Microbiology
Jung-Hoon Bae, Mi-Jin Kim, Bong Hyun Sung, Yong-Su Jin, Jung-Hoon Sohn
Summary: The extracellular conversion of xylose to xylulose before uptake has been found to be effective in xylose fermentation or glucose/xylose co-fermentation, reducing the competition between glucose and xylose for cellular uptake. The engineered XI secretion system developed in this study may enable the simultaneous utilization of C5/C6 sugars from sustainable lignocellulosic biomass.
BIOTECHNOLOGY FOR BIOFUELS
(2021)
Article
Multidisciplinary Sciences
Nur Zahidah Nasoha, Abdullah Amru Indera Luthfi, Muhammad Faizuddin Roslan, Hikmah Bajunaid Hariz, Nurul Adela Bukhari, Shareena Fairuz Abdul Manaf
Summary: This study explores the potential of utilizing pineapple peel hydrolysate for xylitol production and provides key experimental results on optimum fermentation conditions and substitutes. It has significant implications for economic benefits and environmental sustainability.
SCIENTIFIC REPORTS
(2023)
Article
Food Science & Technology
Yan Chen, Lei Chen, Lei Liu, Xiufang Bi, Xiaocui Liu
Summary: The effects of natural fermentation and inoculation fermentation on the volatile flavor substances of pickled ginger were investigated. High-throughput sequencing and gas chromatographic-mass spectrometry were used to analyze the bacterial community and flavor compounds during fermentation. The results showed that inoculation fermentation changed the abundance of bacteria in pickled ginger, leading to improved volatile flavor compounds compared to natural fermentation.
Article
Environmental Sciences
Lenno van den Berg, Mario Pronk, Mark C. M. van Loosdrecht, Merle K. de Kreuk
Summary: This study compared four methods to measure the density of granular sludge in a full-scale plant treating domestic sewage, and assessed the effect of salinity on granule density. Most methods yielded reliable results, as long as the effect of salinity was considered.
ENVIRONMENTAL TECHNOLOGY
(2023)
Article
Environmental Sciences
Sadiye Kosar, Onur Isik, Busra Cicekalan, Hazal Gulhan, Ece Sagir Kurt, Ezgi Atli, Safak Basa, Hale Ozgun, Ismail Koyuncu, Mark C. M. van Loosdrecht, Mustafa Evren Ersahin
Summary: This study investigated the impact of settling prior to the aerobic granular sludge (AGS) process on granulation and treatment performance. The results showed that granulation was achieved in both stages, with over 92% COD removal efficiency in each stage. However, settling prior to the AGS process led to a decrease in nitrogen and phosphorus removal efficiencies.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Vojtech Kouba, Kamila Hurkova, Klara Navratilova, Dana Kok, Andrea Benakova, Michele Laureni, Patricie Vodickova, Tomas Podzimek, Petra Lipovova, Laura van Niftrik, Jana Hajslova, Mark C. M. van Loosdrecht, David Gregory Weissbrodt, Jan Bartacek
Summary: This study investigates the adaptation mechanisms of anammox bacteria to low temperatures. Shorter ladderane lipids were found to play a key role in low-temperature adaptation. Ca. Scalindua and Ca. Kuenenia exhibited different ladderane lipid profiles compared to Ca. Brocadia, suggesting their adaptability to low temperatures. Additionally, the study proposes new mechanisms, including ladderanes with absent phosphatidyl headgroup, for the low-temperature adaptation of anammox bacteria.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
S. de Bruin, D. Vasquez-Cardenas, S. M. Sarbu, F. J. R. Meysman, D. Z. Sousa, M. C. M. van Loosdrecht, Y. Lin
Summary: This study analyzed the presence of sGAG in acidophilic biofilm samples collected from Sulfur Cave in Romania. Results showed that the recovered sGAG had a structure similar to chondroitin and contained polysaccharides and sulfate. Genomic sequence analysis supported the hypothesis that sGAGs are synthesized by microbes within the biofilm.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Laurence Strubbe, Edward J. H. van Dijk, Pascalle J. M. Deenekamp, Mark C. M. van Loosdrecht, Eveline I. P. Volcke
Summary: In the pursuit of reducing carbon footprint and energy costs, energy efficiency is crucial. This study focused on aerobic granular sludge reactors and found that they consume up to 50% less energy compared to conventional activated sludge systems. The study also investigated the dynamic behavior of the alpha factor and identified exchange ratio and temperature as the main influencing factors on its rate of increase during the aeration phase.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Sadiye Kosar, Onur Isik, Busra Cicekalan, Hazal Gulhan, Seyma Cingoz, Mustafa Yoruk, Hale Ozgun, Ismail Koyuncu, Mark C. M. van Loosdrecht, Mustafa Evren Ersahin
Summary: Achieving a neutral/positive energy balance without compromising discharge standards is a key goal in wastewater treatment plants. This study explores the coupling of high-rate activated sludge (HRAS) process with aerobic granular sludge (AGS) process as an energy-efficient pre-treatment option. The results show that feeding the AGS process with a mixture of HRAS process effluent and raw municipal wastewater can increase energy recovery potential and maintain high effluent quality.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Construction & Building Technology
Amir Tabakovic, Jeremy Lemmens, Jelmer Tamis, Dave van Vliet, Sayeda Nahar, Willem Suitela, Mark van Loosdrecht, Greet Leegwater
Summary: Bitumen is essential in asphalt pavements for its binding properties and ability to restore damage caused by traffic loading. With the decline in crude oil production, there is a need to find environmentally sustainable alternatives for bitumen modifiers. This paper investigates the potential use of the bio-based co-polymer PHBV as an alternative bitumen modifier and presents positive results from various tests.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Environmental
Navid Ahmadi, Mona Abbasi, Ali Torabian, Mark C. M. van Loosdrecht, Joel Ducoste
Summary: The transformation of four pharmaceuticals in a moving bed biofilm reactor was investigated under different COD/N ratios. Changes in the COD/N ratio influenced the competition between heterotrophic and nitrifying communities, resulting in shifts in microbial populations and composition in the biofilms. Autotrophic conditions exhibited higher transformation rates, indicating the importance of nitrification.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Materials Science, Characterization & Testing
Nam Kyeun Kim, Debes Bhattacharyya, Mark van Loosdrecht, Yuemei Lin
Summary: This research developed a bio-based flame retardant using a biopolymer derived from wastewater sludge to enhance the fire performance of polypropylene (PP). The study found that the extracellular polymeric substances (EPS) from wastewater sludge played a significant role in improving the char formation of PP composite. The incorporation of the bio-based flame retardant restricted the vertical burning characteristics of PP and improved its tensile moduli.
Article
Engineering, Environmental
Xi Bai, Inez J. T. Dinkla, Gerard Muyzer
Summary: This study found that both DNA and RNA data should be considered when studying the microbial communities in slow sand filters (SSF). The microbial communities in the Schmutzdecke layer were influenced by the influent water and shared a core microbiome among different filters. Indicator organisms associated with the age of Schmutzdecke were also identified.
Article
Microbiology
Muhe Diao, Cherel Balkema, Maria Suarez-Munoz, Jef Huisman, Gerard Muyzer
Summary: Changes in stratification and mixing events have a significant impact on the nitrogen cycle of seasonally stratified lakes. This study investigated the succession of nitrogen-transforming microorganisms in Lake Vechten over a period of 19 months and found that their abundance and activity varied with the seasonal stratification pattern. The results suggest that global warming-induced changes in stratification and vertical mixing are likely to alter the nitrogen cycle of seasonally stratified lakes.
FEMS MICROBIOLOGY LETTERS
(2023)
Article
Biotechnology & Applied Microbiology
Suyash Gupta, Rieks de Rink, Johannes B. M. Klok, Gerard Muyzer, Caroline M. Plugge
Summary: This study identified the active microbial community members in the BD system by comparing DNA-based and RNA-based sequencing results, and found that the combination of hydraulic retention time (HRT) and sulfide concentration in the anoxic reactor played a significant role in shaping the microbial communities.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2023)
Article
Engineering, Environmental
Quan H. Le, Peter J. T. Verheijen, Mark C. M. van Loosdrecht, Eveline I. P. Volcke
Summary: This study focuses on the application of data reconciliation to dynamic wastewater treatment processes. The researchers studied the SHARON partial nitritation process and found that splitting the long-term dynamic data into subsets corresponding to different pseudo-steady-state operations improved the detection of gross errors and allowed for a higher number of variables to be reconciled. They also discovered that the infiltration of air and errors in grab sampling had a significant impact on calculating N2O emissions.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2022)
Article
Engineering, Environmental
T. Prot, W. Pannekoek, C. Belloni, A. Dugulan, R. Hendrikx, L. Korving, M. C. M. van Loosdrecht
Summary: The study found that vivianite can be efficiently formed in undigested activated sludge, and phosphorus recovery can be achieved without the use of a sludge digester. Additionally, recovering vivianite from undigested sludge can reduce waste disposal and mitigate vivianite scaling formation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Microbiology
Sergio Tomas-Martinez, Le Min Chen, Thomas R. Neu, David G. Weissbrodt, Mark C. M. van Loosdrecht, Yuemei Lin
Summary: The catabolism of sialic acids in a microbial community resembles that of gut microbiota, indicating the importance of sialic acids in the absence of eukaryotic hosts.
FEMS MICROBIOLOGY ECOLOGY
(2022)