Pub Date : 2024-11-09DOI: 10.1016/j.biortech.2024.131737
Fatemeh Boshagh , Ed van Niel , Chul-Jin Lee
Techno-economic analysis and life cycle assessment of thermophilic dark fermentation (TDF) and mesophilic dark fermentation (MDF) integrated with anaerobic digestion (AD) from coffee-manufacturing wastewater (CW) as feedstock were studied. The pilot plants were based in Iran and designed to convert 800 m3/day of CW into hydrogen. The hydrogen volume flow rate (m3/h) under thermophilic conditions was 1.1 times higher than that under mesophilic conditions; however, the hydrogen mass flow rate (kg/h) was approximately equal in both conditions (1.04). The hydrogen production costs for the MDF-AD and TDF-AD plants were 3.86 and 3.84 USD/kg, respectively. A payback period of 1.3 and 1.33 years for the MDF-AD and TDF-AD plants were obtained, respectively. The Global warming potential from the entire system was 0.79 kg CO2-eq/kg hydrogen for the DF-AD plants. The DF commercialization is supported by environmental advantages, despite its higher hydrogen cost than natural gas-based methods.
{"title":"Techno-economic and life-cycle analyses of dark fermentative hydrogen production integrated with anaerobic digestion from coffee-manufacturing wastewater under thermophilic and mesophilic conditions","authors":"Fatemeh Boshagh , Ed van Niel , Chul-Jin Lee","doi":"10.1016/j.biortech.2024.131737","DOIUrl":"10.1016/j.biortech.2024.131737","url":null,"abstract":"<div><div>Techno-economic analysis and life cycle assessment of thermophilic dark fermentation (TDF) and mesophilic dark fermentation (MDF) integrated with anaerobic digestion (AD) from coffee-manufacturing wastewater (CW) as feedstock were studied. The pilot plants were based in Iran and designed to convert 800 m<sup>3</sup>/day of CW into hydrogen. The hydrogen volume flow rate (m<sup>3</sup>/h) under thermophilic conditions was 1.1 times higher than that under mesophilic conditions; however, the hydrogen mass flow rate (kg/h) was approximately equal in both conditions (1.04). The hydrogen production costs for the MDF-AD and TDF-AD plants were 3.86 and 3.84 USD/kg, respectively. A payback period of 1.3 and 1.33 years for the MDF-AD and TDF-AD plants were obtained, respectively. The Global warming potential from the entire system was 0.79 kg CO<sub>2</sub>-eq/kg hydrogen for the DF-AD plants. The DF commercialization is supported by environmental advantages, despite its higher hydrogen cost than natural gas-based methods.</div></div>","PeriodicalId":258,"journal":{"name":"Bioresource Technology","volume":"416 ","pages":"Article 131737"},"PeriodicalIF":9.7,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142610782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-09DOI: 10.1016/j.biortech.2024.131794
Junjun Wang , Qinghua Tian , Jue Kang , Hao Zhou , Xinyi Yu , Guanzhou Qiu , Li Shen
The high cost of harvesting microalgae limits their industrial application. Fungal–microalgal pellets can efficiently harvest microalgae and enhance heavy-metal adsorption. However, the molecular response mechanism of fungal–microalgal pellets under heavy-metal stress remains unclear. Fungal–microalgal pellets in a photobioreactor were used as a research object, and a 98 % harvesting efficiency could be achieved with adding exogenous carbon and nitrogen at pH 5.0–6.0 for 12 h of co-culture. Humic acid- and tryptophan-rich proteins in extracellular polymeric substances (EPS) participate in Cd(II) complexation. The Cd(II) response in fungal-microalgal pellets involves amino acids, glucose, lipids, energy metabolism, and antioxidant systems. The turning point was at 48 h. Proline, histidine, and glutamine synthesis and the adenosine-triphosphate (ATP) binding cassette (ABC) transport pathway play important roles in resistance to Cd(II) biotoxicity. This study provides a reference for the large-scale cultivation of fungal-microalgal symbiotic pellets and the practical application for industrial heavy-metal wastewater.
{"title":"Mechanistic insight of fungal–microalgal pellets in photobioreactor for heavy-metal wastewater bioremediation","authors":"Junjun Wang , Qinghua Tian , Jue Kang , Hao Zhou , Xinyi Yu , Guanzhou Qiu , Li Shen","doi":"10.1016/j.biortech.2024.131794","DOIUrl":"10.1016/j.biortech.2024.131794","url":null,"abstract":"<div><div>The high cost of harvesting microalgae limits their industrial application. Fungal–microalgal pellets can efficiently harvest microalgae and enhance heavy-metal adsorption. However, the molecular response mechanism of fungal–microalgal pellets under heavy-metal stress remains unclear. Fungal–microalgal pellets in a photobioreactor were used as a research object, and a 98 % harvesting efficiency could be achieved with adding exogenous carbon and nitrogen at pH 5.0–6.0 for 12 h of co-culture. Humic acid- and tryptophan-rich proteins in extracellular polymeric substances (EPS) participate in Cd(II) complexation. The Cd(II) response in fungal-microalgal pellets involves amino acids, glucose, lipids, energy metabolism, and antioxidant systems. The turning point was at 48 h. Proline, histidine, and glutamine synthesis and the adenosine-triphosphate (ATP) binding cassette (ABC) transport pathway play important roles in resistance to Cd(II) biotoxicity. This study provides a reference for the large-scale cultivation of fungal-microalgal symbiotic pellets and the practical application for industrial heavy-metal wastewater.</div></div>","PeriodicalId":258,"journal":{"name":"Bioresource Technology","volume":"416 ","pages":"Article 131794"},"PeriodicalIF":9.7,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142610751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-09DOI: 10.1016/j.biortech.2024.131770
Tingting Lu, Feixiang Liu, Chenan Jiang, Jun Cao, Xiaoqiang Ma, Erzheng Su
As global consumption of oil increases and environmental pollution worsens, people are becoming more concerned with sustainable energy development and environmental protection. There is an urgent need to find a sustainable and environmentally friendly new source of lipids to produce biodiesel and other products. In recent years, oleaginous yeast has garnered widespread interest due to its high lipid content. Compared with traditional plant oil sources, oleaginous yeast offers several significant advantages. Firstly, its cultivation is not affected by seasonal and climatic conditions. Secondly, yeast cultivation does not require large amounts of arable land. Additionally, oleaginous yeast grows rapidly, has a short production cycle, and can efficiently accumulate lipids. This review introduces several prominent oleaginous yeasts, focusing on the impact of cultivation conditions on lipid production, strategies to enhance lipid yield, and the development of lipid recovery methods.
{"title":"Strategies for cultivation, enhancing lipid production, and recovery in oleaginous yeasts.","authors":"Tingting Lu, Feixiang Liu, Chenan Jiang, Jun Cao, Xiaoqiang Ma, Erzheng Su","doi":"10.1016/j.biortech.2024.131770","DOIUrl":"10.1016/j.biortech.2024.131770","url":null,"abstract":"<p><p>As global consumption of oil increases and environmental pollution worsens, people are becoming more concerned with sustainable energy development and environmental protection. There is an urgent need to find a sustainable and environmentally friendly new source of lipids to produce biodiesel and other products. In recent years, oleaginous yeast has garnered widespread interest due to its high lipid content. Compared with traditional plant oil sources, oleaginous yeast offers several significant advantages. Firstly, its cultivation is not affected by seasonal and climatic conditions. Secondly, yeast cultivation does not require large amounts of arable land. Additionally, oleaginous yeast grows rapidly, has a short production cycle, and can efficiently accumulate lipids. This review introduces several prominent oleaginous yeasts, focusing on the impact of cultivation conditions on lipid production, strategies to enhance lipid yield, and the development of lipid recovery methods.</p>","PeriodicalId":258,"journal":{"name":"Bioresource Technology","volume":" ","pages":"131770"},"PeriodicalIF":9.7,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142610758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-08DOI: 10.1016/j.biortech.2024.131787
Shiqi Liu , Zeqing Long , Jinsong Liang , Jie Zhang , Duofei Hu , Pengfei Hou , Guangming Zhang
Interpretable causal machine learning (ICML) was used to predict the performance of denitrification and clarify the relationships between influencing factors and denitrification. Multiple models were examined, and XG-Boost model provided the best prediction (R2 = 0.8743). Based on the ICML framework, hydraulic retention time (HRT), mixture chemical oxygen demand/total nitrogen (COD/TN = C/N), mixture COD concentration, and pretreatment technology were identified as important features affecting the denitrification performance. Further, tapping point and partial dependence analyses provided the range of key factors that precisely regulate denitrification. In the application analysis, HRT (6–10.5 h), mixture C/N (6–12), and mixture COD concentration (300–600 mg L−1) were the appropriate operating ranges, achieving TN removal of approximately 73 %–77 %. The effluent TN and COD concentrations met the discharge standards for wastewater in China (class 1A) and EU. These findings provide support for regulating excess sludge as internal carbon source to promote denitrification.
{"title":"Interpretable causal machine learning optimization tool for improving efficiency of internal carbon source-biological denitrification","authors":"Shiqi Liu , Zeqing Long , Jinsong Liang , Jie Zhang , Duofei Hu , Pengfei Hou , Guangming Zhang","doi":"10.1016/j.biortech.2024.131787","DOIUrl":"10.1016/j.biortech.2024.131787","url":null,"abstract":"<div><div>Interpretable causal machine learning (ICML) was used to predict the performance of denitrification and clarify the relationships between influencing factors and denitrification. Multiple models were examined, and XG-Boost model provided the best prediction (R<sup>2</sup> = 0.8743). Based on the ICML framework, hydraulic retention time (HRT), mixture chemical oxygen demand/total nitrogen (COD/TN = C/N), mixture COD concentration, and pretreatment technology were identified as important features affecting the denitrification performance. Further, tapping point and partial dependence analyses provided the range of key factors that precisely regulate denitrification. In the application analysis, HRT (6–10.5 h), mixture C/N (6–12), and mixture COD concentration (300–600 mg L<sup>−1</sup>) were the appropriate operating ranges, achieving TN removal of approximately 73 %–77 %. The effluent TN and COD concentrations met the discharge standards for wastewater in China (class 1A) and EU. These findings provide support for regulating excess sludge as internal carbon source to promote denitrification.</div></div>","PeriodicalId":258,"journal":{"name":"Bioresource Technology","volume":"416 ","pages":"Article 131787"},"PeriodicalIF":9.7,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142610748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-08DOI: 10.1016/j.biortech.2024.131769
Jiaolin Li , Yingxin Huang , Jian Wang , Yan Zhang , Yuxiang Chen
Greenhouse gas emissions during composting inevitably cause environmental pollution. This study investigated the effects of 10 % vermiculite of four particle sizes (<1.5 mm, 1.5–3 mm, 3–5.5 mm and 5.5–8 mm) on greenhouse gas emissions during vermicomposting of corn stover and cow dung. The results revealed that vermiculite reduced CH4 and N2O emissions but increased CO2 emissions. Vermiculite with a particle size of 3–5.5 mm presented the greatest environmental benefits, increasing cumulative CO2 emissions by 19 % and reducing CH4 and N2O emissions by 49 % and 62 %, respectively. A negative correlation was found between the specific surface area of vermiculite and cumulative greenhouse gas emissions (r = −0.7949). Furthermore, vermiculite intensified microbial interactions and accelerated microbial community succession. These results have important implications for understanding how vermiculite regulates greenhouse gas emissions and microbial mechanisms during the vermicomposting process.
{"title":"Vermiculite changed greenhouse gases emission and microbial community succession in vermicomposting: Particle size investigation","authors":"Jiaolin Li , Yingxin Huang , Jian Wang , Yan Zhang , Yuxiang Chen","doi":"10.1016/j.biortech.2024.131769","DOIUrl":"10.1016/j.biortech.2024.131769","url":null,"abstract":"<div><div>Greenhouse gas emissions during composting inevitably cause environmental pollution. This study investigated the effects of 10 % vermiculite of four particle sizes (<1.5 mm, 1.5–3 mm, 3–5.5 mm and 5.5–8 mm) on greenhouse gas emissions during vermicomposting of corn stover and cow dung. The results revealed that vermiculite reduced CH<sub>4</sub> and N<sub>2</sub>O emissions but increased CO<sub>2</sub> emissions. Vermiculite with a particle size of 3–5.5 mm presented the greatest environmental benefits, increasing cumulative CO<sub>2</sub> emissions by 19 % and reducing CH<sub>4</sub> and N<sub>2</sub>O emissions by 49 % and 62 %, respectively. A negative correlation was found between the specific surface area of vermiculite and cumulative greenhouse gas emissions (r = −0.7949). Furthermore, vermiculite intensified microbial interactions and accelerated microbial community succession. These results have important implications for understanding how vermiculite regulates greenhouse gas emissions and microbial mechanisms during the vermicomposting process.</div></div>","PeriodicalId":258,"journal":{"name":"Bioresource Technology","volume":"416 ","pages":"Article 131769"},"PeriodicalIF":9.7,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142610785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-08DOI: 10.1016/j.biortech.2024.131768
Shuang Liu , Muhammad Abu Bakar Saddique , Yiming Liang , Ge Guan , Haotian Su , Beibei Hu , Songqi Yang , Xiumei Luo , Maozhi Ren
Selenium is a crucial micronutrient for human well-being, with significant contributions to antioxidant, anti-ageing, and antiviral activities. However, over one billion people globally struggle with selenium deficiency, leading to a pressing need for selenium supplementation. Conventional selenium-enrich food from plants and animals provides challenges in achieving precise selenium supplementation. Thus, it is crucial to discover selenium carriers that can be cultured in a controlled environment. Multiple studies have shown that microalgae are excellent carriers for selenium enrichment due to their rapid growth, suitability for plant consumption, ease of industrialization, high efficiency in converting organic selenium, and many others. This review focuses on single-celled microalgae, comprehensively reviewing their metabolic pathway, biological transformation, and valuable forms of selenium. Additionally, it forecasts the current application status and prospects of selenium-enriched microalgae in agriculture and global human health. This review provides a reference for the industrial supply of precise selenium-rich raw materials.
{"title":"Microalgae: A good carrier for biological selenium enrichment","authors":"Shuang Liu , Muhammad Abu Bakar Saddique , Yiming Liang , Ge Guan , Haotian Su , Beibei Hu , Songqi Yang , Xiumei Luo , Maozhi Ren","doi":"10.1016/j.biortech.2024.131768","DOIUrl":"10.1016/j.biortech.2024.131768","url":null,"abstract":"<div><div>Selenium is a crucial micronutrient for human well-being, with significant contributions to antioxidant, anti-ageing, and antiviral activities. However, over one billion people globally struggle with selenium deficiency, leading to a pressing need for selenium supplementation. Conventional selenium-enrich food from plants and animals provides challenges in achieving precise selenium supplementation. Thus, it is crucial to discover selenium carriers that can be cultured in a controlled environment. Multiple studies have shown that microalgae are excellent carriers for selenium enrichment due to their rapid growth, suitability for plant consumption, ease of industrialization, high efficiency in converting organic selenium, and many others. This review focuses on single-celled microalgae, comprehensively reviewing their metabolic pathway, biological transformation, and valuable forms of selenium. Additionally, it forecasts the current application status and prospects of selenium-enriched microalgae in agriculture and global human health. This review provides a reference for the industrial supply of precise selenium-rich raw materials.</div></div>","PeriodicalId":258,"journal":{"name":"Bioresource Technology","volume":"416 ","pages":"Article 131768"},"PeriodicalIF":9.7,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142610778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-08DOI: 10.1016/j.biortech.2024.131790
Xueling Ran , Naga Sai Tejaswi Uppuluri , Yun Deng , Shengrui Wang , Zhaokui Ni , Jing Hu , Joachim Müller , Renjie Dong , Jianbin Guo , Hans Oechsner
Phosphorus(P) recycling from waste streams is crucial to mitigate the P depletion crisis. P forms and contents in organic waste are critical for determining the recycling method and efficiency. We constructed an approach to characterize P forms in seven organic waste by combining chemical sequential extraction, enzymatic hydrolysis, and nuclear magnetic resonance(NMR). Livestock manure and straw exhibited a higher active P(H2O-P&NaHCO3-P)(70.54%-84.40% and 65.78%-85.26% of total P) than sewage sludge(18.22%) and food waste(43.90%). Enzymatic hydrolysis revealed over 10% P in the so-called active P of corn(11.30%) and rice straw(13.32%) was phytate-like P, which is not bioavailable. These findings indicate the chemical sequential extraction inaccurately gauges bioavailable-P and underscores the need to convert phytate into plant-available P in recycling processes(biogas, composting), especially for crop straws and chicken manure. This work introduces a novel methodological framework for assessing P potential bioavailability in organic waste, providing fundamental knowledge for the P recycling process optimization.
从废物流中回收磷对于缓解磷耗竭危机至关重要。有机废物中磷的形态和含量对于确定回收方法和效率至关重要。我们结合化学顺序萃取、酶水解和核磁共振（NMR）技术，构建了一种表征七种有机废物中磷形态的方法。与污水污泥（18.22%）和餐厨垃圾（43.90%）相比，畜禽粪便和秸秆表现出更高的活性 P（H2O-P&NaHCO3-P）（占总 P 的 70.54%-84.40% 和 65.78%-85.26%）。酶水解显示，玉米（11.30%）和水稻秸秆（13.32%）的所谓活性 P 中，有超过 10% 的 P 是植酸盐类 P，不能被生物利用。这些研究结果表明，化学顺序萃取法对生物可利用态磷的测量不准确，并强调了在循环过程（沼气、堆肥）中将植酸转化为植物可利用态磷的必要性，尤其是对作物秸秆和鸡粪而言。这项工作引入了一种新的方法框架，用于评估有机废物中钾的潜在生物利用率，为优化钾回收过程提供了基础知识。
{"title":"Phosphorus bioavailability and recycling potential in various organic Waste: Assessment by enzymatic hydrolysis and 31P NMR","authors":"Xueling Ran , Naga Sai Tejaswi Uppuluri , Yun Deng , Shengrui Wang , Zhaokui Ni , Jing Hu , Joachim Müller , Renjie Dong , Jianbin Guo , Hans Oechsner","doi":"10.1016/j.biortech.2024.131790","DOIUrl":"10.1016/j.biortech.2024.131790","url":null,"abstract":"<div><div>Phosphorus(P) recycling from waste streams is crucial to mitigate the P depletion crisis. P forms and contents in organic waste are critical for determining the recycling method and efficiency. We constructed an approach to characterize P forms in seven organic waste by combining chemical sequential extraction, enzymatic hydrolysis, and nuclear magnetic resonance(NMR). Livestock manure and straw exhibited a higher active P(H<sub>2</sub>O-P&NaHCO<sub>3</sub>-P)(70.54%-84.40% and 65.78%-85.26% of total P) than sewage sludge(18.22%) and food waste(43.90%). Enzymatic hydrolysis revealed over 10% P in the so-called active P of corn(11.30%) and rice straw(13.32%) was phytate-like P, which is not bioavailable. These findings indicate the chemical sequential extraction inaccurately gauges bioavailable-P and underscores the need to convert phytate into plant-available P in recycling processes(biogas, composting), especially for crop straws and chicken manure. This work introduces a novel methodological framework for assessing P potential bioavailability in organic waste, providing fundamental knowledge for the P recycling process optimization.</div></div>","PeriodicalId":258,"journal":{"name":"Bioresource Technology","volume":"416 ","pages":"Article 131790"},"PeriodicalIF":9.7,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142610753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-08DOI: 10.1016/j.biortech.2024.131786
Jiefei Mo , Changxun Zhao , Chenxuan Fang , Wangyang Yu , Yuzhou Long , Qingqing Mei , Weixiang Wu
The innovative biodrying-enhanced composting (BEC) process produces highly matured fertilizer within 10 d. To clarify the biodrying-accelerated humification mechanism, structural and molecular variations in humic acid (HA) during BEC were compared to those during 16-d bioaugmented mechanical composting without biodrying. Results showed that BEC produced HA with significantly higher aromaticity and molecular size (p < 0.01). More aromatic skeletons, mainly from biodrying-enhanced lignin decomposition (p < 0.05), contributed to HA aromatization. Reactive phenolic hydroxyls on these skeletons facilitated the binding of other humic precursors, promoting HA elongation. Microbial analysis indicated that Bacillus, Sinibacillus, and Issatchenkia, enriched by drastic heating and dehydration during days 0–3, participated in lignin decomposition. Saccharomonospora, Georgenia, Oceanobacillus, Nigrospora, Kluyveromyces, and Aspergillus contributed to HA elongation during the maturation phase (days 3–9). This study’s findings that biodrying enhanced lignin-related humification pathways by enriching functional microorganisms provides a theoretical foundation for further improving compost humification efficiency.
{"title":"Pre-biodrying treatment enhances lignin-related pathways with phenolic hydroxyls as reactive cores to accelerate humification during composting","authors":"Jiefei Mo , Changxun Zhao , Chenxuan Fang , Wangyang Yu , Yuzhou Long , Qingqing Mei , Weixiang Wu","doi":"10.1016/j.biortech.2024.131786","DOIUrl":"10.1016/j.biortech.2024.131786","url":null,"abstract":"<div><div>The innovative biodrying-enhanced composting (BEC) process produces highly matured fertilizer within 10 d. To clarify the biodrying-accelerated humification mechanism, structural and molecular variations in humic acid (HA) during BEC were compared to those during 16-d bioaugmented mechanical composting without biodrying. Results showed that BEC produced HA with significantly higher aromaticity and molecular size (<em>p</em> < 0.01). More aromatic skeletons, mainly from biodrying-enhanced lignin decomposition (<em>p</em> < 0.05), contributed to HA aromatization. Reactive phenolic hydroxyls on these skeletons facilitated the binding of other humic precursors, promoting HA elongation. Microbial analysis indicated that <em>Bacillus</em>, <em>Sinibacillus</em>, and <em>Issatchenkia</em>, enriched by drastic heating and dehydration during days 0–3, participated in lignin decomposition. <em>Saccharomonospora</em>, <em>Georgenia</em>, <em>Oceanobacillus</em>, <em>Nigrospora</em>, <em>Kluyveromyces</em>, and <em>Aspergillus</em> contributed to HA elongation during the maturation phase (days 3–9). This study’s findings that biodrying enhanced lignin-related humification pathways by enriching functional microorganisms provides a theoretical foundation for further improving compost humification efficiency.</div></div>","PeriodicalId":258,"journal":{"name":"Bioresource Technology","volume":"416 ","pages":"Article 131786"},"PeriodicalIF":9.7,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142610756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-08DOI: 10.1016/j.biortech.2024.131788
Nugroho Adi Sasongko , Jeremy Ayre , Ryozo Noguchi , Navid R. Moheimani , Parisa A. Bahri , Martin Anda , Mitsutoshi Nakajima , Ernie S.A. Soekotjo , Gian Aditya Pertiwi , Tri Handayani , Soen Steven
Anaerobic digestate animal effluent (ADAE) contains high N and P nutrients which need to be treated. In this study, an integrated process was proposed using a microalgae consortium of Chlorella and Scenedesmus. The system was designed for 71 m3/d (medium-sized) and 355 m3/d (large-sized) animals of ADAE. Process simulation estimated to produce 83–417 kg d-1 of microalgae biomass which can be used as further products. As much as 2 kg of animal feed and 36–180 L/d of bio-oil can be produced during the treatment of 1 m3/d of ADAE. The produced biogas can generate 247–1,217 MWh y-1 of electricity. Likewise, the process can reduce greenhouse gas emissions by 2 kg-CO2eq kg−1 of hot standard carcass weight (HSCW). This integrated system offers merits in treating ADAE as well as producing chemicals and energy with low environmental burdens.
{"title":"Utilization and integration of microalgae consortium in treating undiluted anaerobic digestate animal effluent to produce animal feed, bio-oil, and biogas","authors":"Nugroho Adi Sasongko , Jeremy Ayre , Ryozo Noguchi , Navid R. Moheimani , Parisa A. Bahri , Martin Anda , Mitsutoshi Nakajima , Ernie S.A. Soekotjo , Gian Aditya Pertiwi , Tri Handayani , Soen Steven","doi":"10.1016/j.biortech.2024.131788","DOIUrl":"10.1016/j.biortech.2024.131788","url":null,"abstract":"<div><div>Anaerobic digestate animal effluent (ADAE) contains high N and P nutrients which need to be treated. In this study, an integrated process was proposed using a microalgae consortium of <em>Chlorella</em> and <em>Scenedesmus</em>. The system was designed for 71 m<sup>3</sup>/d (medium-sized) and 355 m<sup>3</sup>/d (large-sized) animals of ADAE. Process simulation estimated to produce 83–417 kg d<sup>-1</sup> of microalgae biomass which can be used as further products. As much as 2 kg of animal feed and 36–180 L/d of bio-oil can be produced during the treatment of 1 m<sup>3</sup>/d of ADAE. The produced biogas can generate 247–1,217 MWh y<sup>-1</sup> of electricity. Likewise, the process can reduce greenhouse gas emissions by 2 kg-CO<sub>2</sub>eq kg<sup>−1</sup> of hot standard carcass weight (HSCW). This integrated system offers merits in treating ADAE as well as producing chemicals and energy with low environmental burdens.</div></div>","PeriodicalId":258,"journal":{"name":"Bioresource Technology","volume":"416 ","pages":"Article 131788"},"PeriodicalIF":9.7,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142610783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-08DOI: 10.1016/j.biortech.2024.131781
Wei Zhou , Yanan Wang , Wenting Zhou , Yi Gao , Man Zhao , Shuqi Sun , Binglei Lu , Hong Chen , Weiyi Yang , Yifan Qi , Zhiwei Gong
The valorization of chitin-rich wastes into chemicals and biofuels holds immense economic and environmental benefits. Here, N-acetyl-D-glucosamine (GlcNAc), the basic structural unit of chitin, was firstly described for co-producing microbial lipid and magnesium ammonium phosphate (MAP). Due to the strong substrate inhibition of GlcNAc, a fed-batch culture mode was successfully adopted to achieve high cell density by Cutaneotrichosporon oleaginosum. When a phosphate limitation strategy was applied, cell mass, lipid titer, content, yield, and productivity were 102.7 g/L, 74.2 g/L, 72.2 %, 21.4 g/100 g, and 0.69 g/L/h, respectively. The ammonium ion was efficiently precipitated by forming MAP with a removal rate around 95.4 %. The lipid samples showed high similarity to vegetable oil, which emerged as high-quality precursor for biodiesel production. This study offers a promising strategy for full conversion of GlcNAc into lipid and slow-release fertilizer, which provides an attractive technical route for turning the chitin-rich materials into valuable products.
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