A short heat treatment (HT, 90 °C-100 °C, 5 min) was applied to two-phase anaerobic digestion (TPAD) of pig manure (PM) to investigate its effect on microbial inactivation in the acidified feedstock during the methanogenic phase. The results showed that no differences in biogas production at organic loading rate (OLR) below 4.28 g volatile solid (VS)/(L·d). However, as the organic load increased, the TPAD with HT exhibited greater biogas production and volatile organic acids removal than the control. By stabilizing pH, digestion of HT acidified feedstock at 9.56 g VS/(L·d) OLR resulted in a biogas yield of 340.1 mL/g VS, exceeding the control by 35.6 %. HT enriched syntrophic bacteria, Methanothrix and Methanobacterium methanogens, and one-carbon metabolizing genes in the methanogenic phase, enhancing energy storage and conversion. Accordingly, acidification followed by HT could be a potential method to improve microbial community and load tolerance in methanogenic phase of TPAD.
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http://dx.doi.org/10.1016/j.biortech.2025.132104 | DOI Listing |
Bull Environ Contam Toxicol
January 2025
Sichuan Academy of Eco-Environmental Sciences, Chengdu, 610041, China.
The widespread application of swine-farming wastewater to soil and water is increasingly contributing to heavy metal contamination, posing significant environmental risks. This study investigated the concentrations of eight heavy metals in swine-farming wastewater following different treatment processes, and assessed their ecological risks in Sichuan Province, China. The findings revealed that zinc, copper and nickel exhibited the highest concentrations, potentially causing heavy or strong contamination levels and leading to heavy or slight ecological risks.
View Article and Find Full Text PDFBioresour Technol
January 2025
Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore, 637141, Singapore.
The improvement of biogas production in anaerobic digestion (AD) by biochar introduction has been demonstrated. However, the distribution of biochar in the digester and its effect on AD have been seldom explored. In this study, the distribution of biochar and their impact on AD were investigated in a 30 L semi-continuously operated bench-scale anaerobic digester.
View Article and Find Full Text PDFPolymers (Basel)
January 2025
Faculty of Textile Technology, University of Zagreb, Prilaz baruna Filipovića 28 a, 10000 Zagreb, Croatia.
This research follows the principles of circular economy through the zero waste concept and cascade approach performed in two steps. Our paper focuses on the first step and explores the characteristics of developed biocomposite materials made from a biodegradable poly(lactic acid) polymer (PLA) reinforced with natural fibers isolated from the second generation of biomass (agricultural biomass and weeds). Two plants, L.
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January 2025
Biomass and Oil Palm Research Center of Excellence, Walailak University, Thasala, Nakhon Si Thammarat 80160, Thailand.
In this comprehensive investigation, the sustainable production and utilization of gas separation membranes derived from coconut water (CW) waste was investigated. The research focuses on the synthesis of bacterial cellulose (BC) and cellulose acetate (CA) membranes from CW, followed by a thorough analysis of their characteristics, including morphology, ATR-FTIR spectroscopy, tensile strength, and chemical composition. The study rigorously evaluates membrane performance, with particular emphasis on CO/CH selectivity under various operational conditions, including pressure, membrane thickness, and number of stages.
View Article and Find Full Text PDFMolecules
January 2025
Orlen Unicre a.s., Revolucňí 1521/84, 400 01 Ústí nad Labem, Czech Republic.
The increasing global population and urbanization have led to significant challenges in waste management, particularly concerning vacuum blackwater (VBW), which is the wastewater generated from vacuum toilets. Traditional treatment methods, such as landfilling and composting, often fall short in terms of efficiency and sustainability. Anaerobic digestion (AD) has emerged as a promising alternative, offering benefits such as biogas production and digestate generation.
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