Article
Engineering, Environmental
L. Megido, L. Negral, Y. Fernandez-Nava, B. Suarez-Pena, P. Ormaechea, P. Diaz-Caneja, L. Castrillon, E. Maranon
Summary: The research found that induced bed reactors (IBR) with an organic loading rate (OLR) of 3.6 kg VS/m³ achieved optimal results for anaerobic digestion of supermarket food waste. IBR demonstrated higher methane production and volatile solids (VS) removal compared to completely stirred tank reactors (CSTR).
Article
Agricultural Engineering
Marinus J. Moerland, Laura Castanares Perez, Maria E. Ruiz Velasco Sobrino, Paraschos Chatzopoulos, Brendo Meulman, Vinnie de Wilde, Grietje Zeeman, Cees J. N. Buisman, Miriam H. A. van Eekert
Summary: Thermophilic and hyper-thermophilic anaerobic digestion are effective methods for treating concentrated black water, achieving efficient COD removal and methane production with a shorter start-up time, but may result in lower methane production rates at high temperatures.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agricultural Engineering
Ziqi Xu, Hairong Yuan, Xiujin Li
Summary: This study found that using longer hydraulic retention time and higher load in anaerobic bioconversion of rice straw can lead to increased biogas and methane production. Systems with different HRTs and loads have impacts on microbial richness, diversity, and bacterial and archaeal community compositions, thus affecting bioconversion efficiencies.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Eskandar Poorasgari, Banu Ormeci
Summary: Experimental and computational approaches were used to model the kinetics of volatile solids destruction during wastewater sludge digestion, taking into account the effects of water evaporation. New kinetic models were developed to predict volatile solids concentrations in different conditions. The study found that water evaporation is an important factor to consider for accurate determination of kinetic rate constants and solids reduction.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Engineering, Environmental
Bikash R. Tiwari, Satinder Kaur Brar, Rao Y. Surampalli
Summary: Thermophilic anaerobic digestion is a viable strategy to reduce municipal sludge volume and generate renewable energy. In this study, ultrasonication was found to be the best pretreatment method to enhance the digestion process.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Environmental
Marinus J. Moerland, Koen van Gijn, Xiangyu Ji, Cees J. N. Buisman, Huub H. M. Rijnaarts, Alette A. M. Langenhoff, Miriam H. A. van Eekert
Summary: The removal of micropollutants during thermophilic and hyper-thermophilic anaerobic digestion of concentrated black water was assessed in this study. It was found that the micropollutant loading rate did not affect the removal efficiency, and some pharmaceuticals were almost completely removed (>95% removal). However, the removal efficiency of certain micropollutants was lower. Additionally, there were no differences in micropollutant removal efficiencies between thermophilic and hyper-thermophilic anaerobic digestion of concentrated black water.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
Miguel A. Vital-Jacome, German Buitron
Summary: This study evaluates a two-stage process for treating highly concentrated winery effluents, with a focus on a thermophilic methanogenic stage. Results show that higher organic loading rates in the acidogenic stage lead to higher acetic acid concentrations, while the thermophilic methanogenic stage can achieve high methane production rates and yield. Lower feeding frequencies improve methane productivity and yield, indicating that this parameter is a useful process optimization tool.
Article
Microbiology
Natsumi Ishida, Yoshihisa Kawano, Ryo Fukui, Min Zhang, Yukihiro Tashiro, Kenji Sakai
Summary: Metagenomic analysis was conducted to investigate the microbial dynamics and functional genes in the autothermal thermophilic aerobic digestion (ATAD) process of human excreta, which consists of initial, middle, and final phases. Four gene categories showed changes in abundance during the digestion process. The unusual stable accumulation of ammonia and prompt consumption of short-chain fatty acids could be explained by the presence or absence of related metabolic genes. Besides revealing the relationships between bacteria and physicochemical properties, this research may contribute to improving wastewater management systems worldwide through the use of ATAD process in liquid fertilizer production.
MICROBIOLOGY SPECTRUM
(2022)
Article
Energy & Fuels
Pawel Biedka
Summary: The study presents research results on the rejected water from dewatering sludge in ATAD technology. The study was conducted in three municipal WWTPs, with different capacities and sludge node capacities. The rejected water samples had varying levels of nitrogen, phosphorus, organic matter, and oxygen demand. The study also determined the kinetics of organic matter decomposition and assessed its biodegradability.
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
Biotechnology & Applied Microbiology
Eva Maria Prem, Rudolf Markt, Mathias Wunderer, Andreas Otto Wagner
Summary: Efficient biogas production from organic waste is crucial for achieving carbon neutrality in the future. This study investigated the further digestion of thermophilic press water from a municipal solid waste digester using a combination of thermo- and mesophilic posttreatment methods. The results demonstrated that the press water still had significant biogas potential, particularly during the high season in central Europe. While there was an initial decrease in biogas production during the mesophilic posttreatment, the overall losses could be compensated, resulting in no significant difference in biogas production between the thermo- and mesophilic approaches. These findings suggest that the change in microbial community and the enhanced degradation of problematic intermediates, such as valerate, in the mesophilic reactor contribute to this compensatory effect.
BIOTECHNOLOGY AND BIOENGINEERING
(2023)
Article
Agricultural Engineering
Hao Jiang, Fan Wu, Yuchang Wang, Lu Feng, Hongjun Zhou, Yeqing Li
Summary: In-situ hydrogen biomethanation is a promising technology for upgrading biogas quality, and investigating its characteristics under different conditions is crucial for its effectiveness. The experiments showed that hydrogenotrophic methanogenesis performed better at thermophilic conditions, with the highest methane content obtained when H2 and CO2 were fed at a 4:1 ratio with Methanothermobacter as the dominant genus.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agricultural Engineering
Dong-Mei Zhang, Qing Teng, Dongqing Zhang, Ghulam Jilani, Wei-Ming Ken, Zhi-Peng Yang, Tajwar Alam, Muhammad Ikram, Zahid Iqbal
Summary: The study investigated the impacts of magnesium-ammonium-phosphate (MAP) precipitation on the performance and microbial dynamics in an anaerobic continuously stirred tank reactor (CSTR) coupled with sequencing batch reactor (SBR) for swine wastewater treatment. Results showed an overall higher removal efficiency for COD, NH4+ and PO43- with MAP precipitation. The increase in microbial community richness and diversity with MAP was conducive to nitrogen and phosphorus removal, as well as biogas production.
BIORESOURCE TECHNOLOGY
(2021)
Review
Agricultural Engineering
Mirko Cucina, Patrizia de Nisi, Fulvia Tambone, Fabrizio Adani
Summary: Bioplastics are increasingly being used as substitutes for petroleum-derived plastics due to their biodegradability, however, concerns arise over incomplete degradation and leakage into the environment during waste management processes. This paper reviews literature on the biodegradation of bioplastics in industrial and natural environments, and discusses the potential role of waste management processes in reducing bioplastics leakage.
BIORESOURCE TECHNOLOGY
(2021)
Article
Energy & Fuels
Jingmiao Zhang, Shuai Wu, Ao Xia, Dong Feng, Yun Huang, Xianqing Zhu, Xun Zhu, Qiang Liao
Summary: Anaerobic digestion (AD) technology is an effective method for biogas production and livestock waste treatment. This study investigated the impact of oxytetracycline (OTC) on the AD process and found that OTC significantly inhibited methane production, with methane yields decreasing by 58.6% and 73.3% in mesophilic and thermophilic ADs respectively at an initial OTC concentration of 400 mg/L. OTC can be degraded by the AD process with a removal efficiency above 90% at lower concentrations. Higher OTC concentrations resulted in lower bio-methane yield, energy conversion efficiency, and contaminant removal in both mesophilic and thermophilic ADs.
