Article
Environmental Sciences
Sayed Q. Hashimi, Seung-Hee Hong, Chang-Gu Lee, Seong-Jik Park
Summary: Aluminum-impregnated food waste was used as an adsorbent for removing As(III) from aqueous solutions. The optimization of the modification and carbonization conditions was carried out, and the factors affecting the adsorption capacity of the adsorbent were studied. The results showed that Al-FWB is a promising low-cost adsorbent with good performance for adsorbing As(III).
Article
Thermodynamics
Mehrshad Nazarpour, Ahmad Taghizadeh-Alisaraei, Ali Asghari, Ahmad Abbaszadeh-Mayvan, Aliasghar Tatari
Summary: This study aimed to design and fabricate a micro-photobioreactor for bio-hydrogen production, and optimized the variables affecting hydrogen production using the response surface methodology. The results showed that test length had a significant impact on hydrogen production, while sulfur content and biomass concentration had no significant effect. The optimal conditions for maximum bio-hydrogen production were identified as sulfur concentration of 0.75%, run time of 101.96 h, and biomass concentration of 53.31 g/L, with a production of 66.32 mL g-VS-1.
Article
Energy & Fuels
Snigdhendubala Pradhan, Muhammad Shahbaz, Ali Abdelaal, Tareq Al-Ansari, Hamish R. Mackey, Gordon McKay
Summary: The properties of biochar produced from waste cabbage biomass were optimized by adjusting pyrolysis temperature and feed particle size. The study found that a lower temperature and smaller particle size resulted in better quality biochar. Additionally, the optimized biochar improved water retention and plant growth in sandy soil.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Engineering, Multidisciplinary
Benjapon Chalermsinsuwan, Yueh-Heng Li, Kanit Manatura
Summary: Due to the COVID-19 pandemic, large amounts of medical wastes have been produced, posing environmental and human health risks. This study investigated the gasification process parameters for COVID-19 medical masks to optimize hydrogen yield and cold gas efficiency. The results showed that steam ratio and temperature significantly affected the process. The optimized conditions achieved a high hydrogen yield and cold gas efficiency, supporting the use of plastic waste as a feedstock for steam gasification.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Pratibha Gautam, Sunil Kumar, Shilpa Vishwakarma, Arun Gautam
Summary: This study investigates the treatability of leachate from hazardous waste landfills through electrocoagulation. The results show that electrocoagulation can effectively reduce the chemical oxygen demand (COD) of the leachate by up to 90% under optimized conditions. Significant reductions in other parameters were also observed. The findings suggest that electrocoagulation can be a viable alternative to energy extensive treatment technologies for managing leachate from hazardous waste landfills.
Article
Engineering, Environmental
Yue Zhao, Fengrong Han, Linyi Guo, Jun Zhang, Haidong Zhang, Izzeldin Ibrahim Mohamed Abdelaziz, Kamarul Hawari Ghazali
Summary: This study presents a novel flotation process with corona modification pretreatment to facilitate the separation of PET-PVC mixtures, aiming to increase the recyclable value of PET. Through experiments and response surface methodology, control parameters of the combined process were optimized to achieve high purity PET products and efficient energy recovery.
Article
Energy & Fuels
Asmita Mishra, B. C. Meikap
Summary: The aim of this study was to investigate the optimal operating conditions for pyrolysis of waste motor oil in a semi-batch pyrolyzer to generate transport-grade fuels for sustainable management of hazardous waste and alternative energy generation. The Box-Behnken design and desirability criteria were used to optimize process parameters and maximize pyro-oil yield. Reactor temperature, holding time, and heating rate were found to have the most significant impact on pyro-oil yield. The optimized conditions resulted in a maximum pyro-oil yield of 92.55% with a desirability of 0.843 at a constant nitrogen flowrate of 0.6 LPM. Confirmation and validation of the optimized conditions were also performed. The optimized pyro-oil showed enrichment in paraffinic groups and improved igniting characteristics and oxidative stability.
Article
Energy & Fuels
Sabarathinam Shanmugam, Thangavel Mathimani, Karthik Rajendran, Manigandan Sekar, Eldon. R. Rene, Nguyen Thuy Lan Chi, Huu Hao Ngo, Arivalagan Pugazhendhi
Summary: A significant problem faced globally is the increasing amount of food and food processing wastes being discarded, with over one-third of all produced food and its derivatives being wasted. An intriguing solution to this issue is the utilization of food waste for biohydrogen production, which can serve as a fuel. This review focuses on the primary methodologies for converting food and food-processing waste into biohydrogen using biochemical and electrochemical methods, discusses the challenges associated with these processes, and explores potential approaches to enhance biohydrogen production. Once the robustness, quality, and performance of biological and electrochemical routes are optimized and pilot-scale studies are conducted, food and food-processing wastes could become potential candidates for transitioning to a sustainable circular hydrogen economy.
Article
Agricultural Engineering
Ju-Hyeong Jung, Young-Bo Sim, Jong-Hyun Baik, Jong-Hun Park, Saint Moon Kim, Jisu Yang, Sang-Hyoun Kim
Summary: The study found that heat-treated and frozen H2-producing granular sludge showed higher H2 yield and production rate compared to heat-treated methanogenic sludge in mixed-culture dark fermentative H2 production. Inoculation after centrifugation method demonstrated better H2 production performance. Homoacetogenesis was identified as a major H2-consuming pathway, and the abundance of Clostridium showed a linear relationship with H2 production rate and lag-phase time.
BIORESOURCE TECHNOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Silvia Saikia, Ajay S. Kalamdhad
Summary: This article discusses the process of converting municipal solid waste into valuable byproducts using pyrolysis technology, and utilizes central composite design to determine the optimal pyrolysis conditions. The results indicate that the operating temperature is the most influential factor on char yield.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2023)
Article
Agricultural Engineering
Ju-Hyeong Jung, Young-Bo Sim, Jong-Hyun Baik, Jong-Hun Park, Sang-Hyoun Kim
Summary: The study found that high hydrogen production rate can be achieved using hybrid immobilization from food waste in mesophilic conditions, although the hydrogen yield was relatively low at the same conditions.
BIORESOURCE TECHNOLOGY
(2021)
Article
Chemistry, Applied
Vera Meilani, Jae-In Lee, Jin-Kyu Kang, Chang-Gu Lee, Sanghyun Jeong, Seong-Jik Park
Summary: The study investigated the use of aluminum-impregnated biochar derived from food waste (Al-FWB) for fluoride removal from aqueous solutions, determining optimal synthesis conditions, removal efficiency, and mechanism. Results showed that Al-FWB has the potential to be an effective adsorbent for fluoride removal.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Environmental Sciences
Shukla Neha, Neelancherry Remya
Summary: This study investigated the microwave co-pyrolysis of food waste and low-density polyethylene to optimize operating parameters for maximum bio-oil yield with low total acid number. Addition of LDPE improved bio-oil yield and quality, with identified compounds suitable for various energy applications. The energy consumption analysis showed a requirement of 13.11 kWh/kg for bio-oil production.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Green & Sustainable Science & Technology
Yunshan Wang, Gang Yang, Valerie Sage, Jian Xu, Guangzhi Sun, Jun He, Yong Sun
Summary: The production of biohydrogen through dark fermentation was optimized using a novel hybrid approach that combines artificial neural networks (ANNs) with response surface methodology (RSM). The method was found to be cost-effective, reliable, and capable of extensively analyzing critical operational parameters, resulting in significant changes in process performance. The established hybrid ANN-RSM system can achieve both single and multiple objective optimizations for dark hydrogen fermentation, leading to improved hydrogen production and metabolite concentrations.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2021)
Article
Agricultural Engineering
Santhoshkumar Subramaniam, Kumutha Karunanandham, A. S. M. Raja, Sivakumar Uthandi
Summary: The present study aimed to add value to cotton waste biomass using a more eco-friendly process called EnZolv, which effectively removes lignin from cotton stalk and cotton ginning mill waste. The optimized EnZolv process achieved a delignification rate of 78.68% in cotton stalk and 70.53% in ginning mill waste using specific parameters determined through Response Surface Methodology. These findings have significant implications for the utilization and sustainable management of cotton waste biomass.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
Gede Adi Wiguna Sudiartha, Tsuyoshi Imai, Yung-Tse Hung
Summary: This study investigated the effects of temperature shifts on methane gas production and microbial diversity during anaerobic digestion. The results showed that temperature shifts significantly affected methane production, and Methanosaeta was found to be a thermotolerant archaea.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Article
Environmental Sciences
Tsuyoshi Imai, Huy Thanh Vo, Masato Fukushima, Tasuma Suzuki, Hiraku Sakuma, Takashi Hitomi, Yung-Tse Hung
Summary: The concentration of hydrogen sulfide in sewer pipes can be mitigated by using conductive concrete as a microbial fuel cell. Conductive concrete provides an electron pathway from deposited sludge to dissolved oxygen, resulting in the oxidation of hydrogen sulfide and the decrease in its concentration.
Article
Environmental Sciences
Azzah Nazihah Che Abdul Rahim, Shotaro Yamada, Haruki Bonkohara, Sergio Mestre, Tsuyoshi Imai, Yung-Tse Hung, Izumi Kumakiri
Summary: In this study, TiO2 membranes and Ag/TiO2 membranes were prepared for wastewater treatment. The deposition of silver on TiO2 membranes improved the degradation rate. The presence of salts reduced the treatment performance, but it could be recovered by washing the membranes.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Editorial Material
Environmental Sciences
Yung-Tse Hung, Rehab O. Abdel Rahman, Hamidi Abdul Aziz, Issam A. Al-Khatib, Tsuyoshi Imai
Article
Biochemistry & Molecular Biology
Kamolwan Thepsuthammarat, Alissara Reungsang, Pensri Plangklang
Summary: Improving biomass production by using low-cost substrates is important for large-scale microalgae production. In this study, the microalga Coelastrella sp. KKU-P1 was cultivated mixotrophically using unhydrolyzed molasses as a carbon source. The optimal conditions for maximizing biomass production were determined, and a batch cultivation achieved the highest biomass production of 3.81 g/L. CO2 supplementation did not improve biomass production, indicating that ambient CO2 concentration was sufficient for mixotrophic growth. The biochemical analysis showed that the microalgal biomass has potential as a source of essential amino acids, pigments, and fatty acids.
Article
Environmental Sciences
Huy Thanh Vo, Tsuyoshi Imai, Masato Fukushima, Tasuma Suzuki, Hiraku Sakuma, Takashi Hitomi, Yung-Tse Hung
Summary: This study demonstrates the effectiveness of biological oxidation for controlling hydrogen sulfide (H2S) by using a rod-shaped electrode made of highly conductive concrete. Bacterial flora analysis was conducted to identify electricity-producing bacteria, and results showed effective mitigation of H2S with the presence of Geobacter sp. and Pelobacter sp. around the anode. Highly conductive concrete creates an electron pathway for biological oxidation of H2S, allowing effective H2S control in sewer systems even under anaerobic conditions.
Article
Biotechnology & Applied Microbiology
Gede Adi Wiguna Sudiartha, Tsuyoshi Imai, Chonticha Mamimin, Alissara Reungsang
Summary: Temperature plays a significant role in anaerobic digestion, affecting microbial communities and process efficiency. This study tested two temperature shift scenarios and found that both led to a decrease in biogas production, with the upshifted scenario experiencing a larger decrease. 16S rRNA sequencing revealed that the dominant methanogens differed between the two scenarios, indicating that temperature shifts affect microbial communities and biogas production.
FERMENTATION-BASEL
(2023)
Article
Biotechnology & Applied Microbiology
Sureewan Sittijunda, Sulfan Baka, Rattana Jariyaboon, Alissara Reungsang, Tsuyoshi Imai, Prawit Kongjan
Summary: This study aimed to enhance dark fermentative hydrogen production from co-digestion of distillery wastewater and glycerol waste. The optimal ratio of DW and GW for hydrogen production was found to be 99:1, resulting in a hydrogen yield of 149.5 mL-H-2/g - VSadded. The dark fermentation effluent was then used for methane production, with a maximum methane yield of 115.1 mL-CH4/g - VSadded. Microbial community analysis revealed the presence of methanogenic archaea in the microbial electrolysis cell reactor.
FERMENTATION-BASEL
(2022)
Article
Biotechnology & Applied Microbiology
Marika Ngamsirisomsakul, Mallika Boonmee Kongkeitkajorn, Sittipong Amnuaypanich, Alissara Reungsang
Summary: Sugarcane bagasse can be used as a raw material for microbial lipid production, and incorporating glycerol into unconcentrated bagasse hydrolysate helps improve growth and lipid production in Rhodotorula glutinis TISTR 5159. When mixed with 10% v/v glycerol, the hydrolysate with yeast extract as the sole nitrogen source achieved the highest lipid yield.
FERMENTATION-BASEL
(2022)
Article
Biotechnology & Applied Microbiology
Khamanitjaree Saripan, Chonticha Mamimin, Tsuyoshi Imai, Sureewan Sittijunda, Alissara Reungsang
Summary: This study aims to create a q-PCR methodology for monitoring microbial communities in hydrogen-producing mixed cultures and develop specific primers for quantitative analysis of hydrogen-producing bacteria. The dominant bacteria in the enriched thermophilic mixed cultures were identified as Clostridium sp. and Thermoanaerobacterium sp., and their 16S rRNA gene copy number increased with time during hydrogen production.
FERMENTATION-BASEL
(2022)
Article
Biotechnology & Applied Microbiology
Apik Khautsart Miftah, Sureewan Sittijunda, Tsuyoshi Imai, Apilak Salakkam, Alissara Reungsang
Summary: This study determined the optimal conditions for the pretreatment of sugarcane leaves with deep eutectic solvent (DES), and found the best fermentation mode for hydrogen and methane production from DES-pretreated sugarcane leaves. The results showed that the simultaneous saccharification and fermentation (SSF) process was more efficient than the separate hydrolysis and fermentation (SHF) process in both two-stage hydrogen and methane production process and one-stage methane production process.
FERMENTATION-BASEL
(2022)
Article
Biotechnology & Applied Microbiology
Sreyden Hor, Mallika Boonmee Kongkeitkajorn, Alissara Reungsang
Summary: This study investigates the biorefinery of sugarcane bagasse into ethanol and xylitol. The results show that ethanol fermentation of sugarcane bagasse hydrolysate can be carried out without supplementing a nitrogen source, and approximately 50 g/L of bioethanol can be produced after 36 hours of fermentation. The vinasse containing xylose can be successfully used to produce xylitol, and supplementing the vinasse with yeast extract improves xylitol production. Controlled dissolved oxygen and the addition of low fraction of molasses do not positively affect xylitol production.
FERMENTATION-BASEL
(2022)
Article
Biochemistry & Molecular Biology
Pornchai Rachtanapun, Sarinthip Thanakkasaranee, Rafael A. Auras, Nareekan Chaiwong, Kittisak Jantanasakulwong, Pensak Jantrawut, Yuthana Phimolsiripol, Phisit Seesuriyachan, Noppol Leksawasdi, Thanongsak Chaiyaso, Sarana Rose Somman, Warintorn Ruksiriwanich, Warinporn Klunklin, Alissara Reungsang, Thi Minh Phuong Ngo
Summary: The effect of sodium hydroxide concentrations on the morphology, mechanical properties, and water barrier properties of carboxymethyl rice starch films was investigated. Increasing NaOH concentrations resulted in higher degree of substitution of CMSr powders, leading to changes in morphology. The water solubility, elongation at break, and water vapor permeability of the films increased as NaOH concentrations increased, while the water contact angle, melting temperature, and tensile strength decreased.
