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Enhanced methane production during long-term UASB operation at high organic loads as enabled by the immobilized

《环境科学与工程前沿(英文)》 2022年 第16卷 第6期 doi: 10.1007/s11783-021-1505-4

摘要:

• Fungi enable the constant UASB operation even at OLR of 25.0 kg/(m3×d).

关键词: Anaerobic digestion     Fungi     Methane production     High OLR     Microbial community    

propionate-oxidizing microflora and its bioaugmentation on anaerobic wastewater treatment for enhancing methaneproduction and COD removal

Chong Liu, Jianzheng Li, Shuo Wang, Loring Nies

《环境科学与工程前沿(英文)》 2016年 第10卷 第4期 doi: 10.1007/s11783-016-0856-8

摘要: Syntrophic propionate-oxidizing microflora B83 was enriched from anaerobic sludge. The bioaugmentation of microflora B83 were evaluated from wastewater treatment. Methane yield and COD removal were enhanced by bioaugmentation of microflora B83. Hydrogen-producing acetogensis was a rate-limiting step in methane fermentation. Methane fermentation process can be restricted and even destroyed by the accumulation of propionate because it is the most difficult to be anaerobically oxidized among the volatile fatty acids produced by acetogenesis. To enhance anaerobic wastewater treatment process for methane production and COD removal, a syntrophic propionate-oxidizing microflora B83 was obtained from an anaerobic activated sludge by enrichment with propionate. The inoculation of microflora B83, with a 1:9 ratio of bacteria number to that of the activated sludge, could enhance the methane production from glucose by 2.5 times. With the same inoculation dosage of the microflora B83, COD removal in organic wastewater treatment process was improved from 75.6% to 86.6%, while the specific methane production by COD removal was increased by 2.7 times. Hydrogen-producing acetogenesis appeared to be a rate-limiting step in methane fermentation, and the enhancement of hydrogen-producing acetogens in the anaerobic wastewater treatment process had improved not only the hydrogen-producing acetogenesis but also the acidogenesis and methanogenesis.

关键词: Anaerobic wastewater treatment     Methane production     Hydrogen-producing acetogenesis     Methanogenesis     Rate-limiting step     Bioaugmentation    

ALKALINE PRETREATMENT AND AIR MIXING FOR IMPROVEMENT OF METHANE PRODUCTION FROM ANAEROBIC CO-DIGESTION

《农业科学与工程前沿(英文)》 2023年 第10卷 第3期   页码 424-436 doi: 10.15302/J-FASE-2023506

摘要:

● Integration of alkaline pretreatment and air mixing for co-digestion was validated.

关键词: sodium hydroxide     air injection     cumulative methane yield     kinetic modeling analysis     digestate    

Production of hydrogen from fossil fuel: A review

《能源前沿(英文)》 2023年 第17卷 第5期   页码 585-610 doi: 10.1007/s11708-023-0886-4

摘要: Production of hydrogen, one of the most promising alternative clean fuels, through catalytic conversion from fossil fuel is the most technically and economically feasible technology. Catalytic conversion of natural gas into hydrogen and carbon is thermodynamically favorable under atmospheric conditions. However, using noble metals as a catalyst is costly for hydrogen production, thus mandating non-noble metal-based catalysts such as Ni, Co, and Cu-based alloys. This paper reviews the various hydrogen production methods from fossil fuels through pyrolysis, partial oxidation, autothermal, and steam reforming, emphasizing the catalytic production of hydrogen via steam reforming of methane. The multicomponent catalysts composed of several non-noble materials have been summarized. Of the Ni, Co, and Cu-based catalysts investigated in the literature, Ni/Al2O3 catalyst is the most economical and performs best because it suppresses the coke formation on the catalyst. To avoid carbon emission, this method of hydrogen production from methane should be integrated with carbon capture, utilization, and storage (CCUS). Carbon capture can be accomplished by absorption, adsorption, and membrane separation processes. The remaining challenges, prospects, and future research and development directions are described.

关键词: methane     catalytic conversion     natural gas     hydrogen production     CCUS    

Degradation of polyacrylamide (PAM) and methane production by mesophilic and thermophilic anaerobic digestion

Mona Akbar, Muhammad Farooq Saleem Khan, Ling Qian, Hui Wang

《环境科学与工程前沿(英文)》 2020年 第14卷 第6期 doi: 10.1007/s11783-020-1277-2

摘要: Abstract • PAM degradation in thermophilic AD in comparison with mesophilic AD. • PAM degradation and its impact on thermophilic and mesophilic AD. • Enhanced methane yield in presence of PAM during thermophilic and mesophilic AD. • PAM degradation and microbial community analysis in thermophilic and mesophilic AD. Polyacrylamide (PAM) is generally employed in wastewater treatment processes such as sludge dewatering and therefore exists in the sludge. Furthermore, it degrades slowly and can deteriorate methane yield during anaerobic digestion (AD). The impact or fate of PAM in AD under thermophilic conditions is still unclear. This study mainly focuses on PAM degradation and enhanced methane production from PAM-added sludge during 15 days of thermophilic (55°C) AD compared to mesophilic (35°C) AD. Sludge and PAM dose from 10 to 50 g/kg TSS were used. The results showed that PAM degraded by 76% to 78% with acrylamide (AM) content of 0.2 to 3.3 mg/L in thermophilic AD. However, it degraded only 27% to 30% with AM content of 0.5 to 7.2 mg/L in mesophilic AD. The methane yield was almost 230 to 238.4 mL/g VSS on the 8th day in thermophilic AD but was 115.2 to 128.6 mL/g VSS in mesophilic AD. Mechanism investigation revealed that thermophilic AD with continuous stirring not only enhanced PAM degradation but also boosted the organics release from the sludge with added PAM and gave higher methane yield than mesophilic AD.

关键词: Polyacrylamide (PAM) degradation     Acrylamide (AM)     Mesophilic anaerobic digestion     Thermophilic anaerobic digestion     Methane production    

Impact of food to microorganism ratio and alcohol ethoxylate dosage on methane production in treatment

Yulun Nie, Xike Tian, Zhaoxin Zhou, Yu-You Li

《环境科学与工程前沿(英文)》 2017年 第11卷 第6期 doi: 10.1007/s11783-017-0947-1

摘要: The effects of food to microorganism (F/M) ratio and alcohol ethoxylate (AE) dosage on the methane production potential were investigated in treatment of low-strength wastewater by a submerged anaerobic membrane bioreactor (SAnMBR). The fate of AE and its acute and/or chronic impact on the anaerobic microbes were also analyzed. The results indicated that AE had an inhibitory effect to methane production potential (lag-time depends on the AE dosage) and the negative effect attenuated subsequently and methane production could recover at F/M ratio of 0.088–0.357. VFA measurement proved that AE was degraded into small molecular organic acids and then converted into methane at lower F/M ratio (F/M<0.158). After long-term acclimation, anaerobic microbe could cope with the stress of AE by producing more EPS (extracellular polymeric substances) and SMP (soluble microbial products) due to its self-protection behavior and then enhance its tolerance ability. However, the methane production potential was considerably decreased when AE was present in wastewater at a higher F/M ratio of 1.054. Higher AE amount and F/M ratio may destroy the cell structure of microbe, which lead to the decrease of methane production activity of sludge and methane production potential.

关键词: Anaerobic membrane bioreactor AnMBR     F/M ratio     Surfactant     Wastewater     Methane production     Influence    

Thermochemical pretreatment of meat and bone meal and its effect on methane production

Guangxue WU , Zhenhu HU , Mark G. HEALY , Xinmin ZHAN ,

《环境科学与工程前沿(英文)》 2009年 第3卷 第3期   页码 300-306 doi: 10.1007/s11783-009-0031-6

摘要: Since the solubilization of meat and bone meal (MBM) is a prerequisite in many MBM disposal approaches, enhancement of the solubilization by means of thermochemical pretreatment was investigated in this study at two temperatures (55°C and 131°C) and six sodium hydroxide (NaOH) concentrations (0, 1.25, 2.5, 5, 10 and 20g/L). The MBM volatile solid (VS) reduction ratio was up to 66% and 70% at 55°C and 131°C, respectively. At the same temperature, the VS reduction ratio increased with the increase in the dosage of NaOH. The study on the methane (CH) production potential of pretreated MBM shows that the addition of NaOH at 55°C did not cause the inhibition of the succeeding CH production process. However, CH production was inhibited by the addition of NaOH at 131°C. The CH production potential was in the range of 389 to 503mL CH/g VS MBM and 464 to 555mL CH/g VS MBM at 55°C and 131°C, respectively.

关键词: thermochemical pretreatment     meat and bone meal     solid reduction     solid solubilization     methane production potential    

Optimization of microwave pretreatment of lignocellulosic waste for enhancing methane production: Hyacinth

Bai-Hang Zhao, Jie Chen, Han-Qing Yu, Zhen-Hu Hu, Zheng-Bo Yue, Jun Li

《环境科学与工程前沿(英文)》 2017年 第11卷 第6期 doi: 10.1007/s11783-017-0965-z

摘要: The effect of microwave pretreatment on the anaerobic degradation of hyacinth was investigated using response surface methodology (RSM). The components of lignin and the other constituents of hyacinth were altered by microwave pretreatment. Comparison of the near-infrared spectra of hyacinth pretreated by microwave irradiation and water-heating pretreatment revealed that no new compounds were generated during hyacinth pretreatment by microwave irradiation. Atomic force microscopy observations indicated that the physical structures of hyacinth were disrupted by microwave pretreatment. The yield of methane per gram of the microwave-irradiated substrate increased by 38.3% as compared to that of the substrate pretreated via water-heating. A maximum methane yield of 221 mL·g-sub was obtained under the optimum pretreatment conditions (substrate concentration (PSC) = 20.1 g·L and pretreatment time (PT) = 14.6 min) using RSM analysis. A maximum methane production rate of 0.76 mL·h ·g-sub was obtained by applying PSC= 9.5 g·L and PT= 11 min. Interactive item coefficient analysis showed that methane production was dependent on the PSC and PT, separately, whereas the interactive effect of the PSC and PT on methane production was not significant. The same trend was also observed for the methane production rate.

关键词: Microwave pretreatment     Response surface methodology     Methane production     Hyacinth     Anaerobic digestion    

低透气性煤层群无煤柱煤气共采理论与实践

袁亮

《中国工程科学》 2009年 第11卷 第5期   页码 72-80

摘要:

在淮南矿区复杂地质条件低透气性煤层群卸压开采抽采瓦斯多年创新和实践的基础上,提出了首采卸压层无煤柱沿空留巷Y型通风煤气共采新思路;通过对采空区边缘岩体结构变形破坏和裂隙演化规律的分析,揭示了采动影响区内顶底板岩层裂隙的动态演化规律、Y型通风方式下采空区的空气压力场分布及卸压瓦斯的流动规律,通过分析沿空留巷围岩大小结构的变化规律,提出了基于锚杆支护的“三位一体”留巷围岩控制技术;研发成功新型CHCT充填材料、强支撑自移模板液压充填支架、干混料集装箱以及充填泵上料系统,建立机械化快速构筑充填墙体工艺系统,发展和创新了低透气性煤层群无煤柱煤气共采的理论及关键技术。

关键词: 低透气性煤层     无煤柱     沿空留巷     煤层气     煤气共采    

High-solid anaerobic digestion of sewage sludge: achievements and perspectives

《环境科学与工程前沿(英文)》 2021年 第15卷 第4期 doi: 10.1007/s11783-020-1364-4

摘要:

• High-solid anaerobic digestion (HS-AD) of sewage sludge (SS) is overviewed.

关键词: High-solid effect     Anaerobic fermentation     Methane production     Biodegradability     Sludge treatment    

Enhanced methane recovery and exoelectrogen-methanogen evolution from low-strength wastewater in an up-flow

Zechong Guo, Lei Gao, Ling Wang, Wenzong Liu, Aijie Wang

《环境科学与工程前沿(英文)》 2018年 第12卷 第4期 doi: 10.1007/s11783-018-1074-3

摘要:

Methane yield increased 22 times from low-strength wastewater by applying conductive fillers.

Conductive fillers accelerated the start-up stage of anaerobic biofilm reactor.

Conductive fillers altered methanogens structure.

关键词: Low-strength wastewater     Methane production     Conductive filler     Microbial community structure    

Techno-economic evaluation of a biogas-based oxidative coupling of methane process for ethylene production

Alberto T. Penteado, Mijin Kim, Hamid R. Godini, Erik Esche, Jens-Uwe Repke

《化学科学与工程前沿(英文)》 2018年 第12卷 第4期   页码 598-618 doi: 10.1007/s11705-018-1752-5

摘要:

This contribution is a preliminary techno-economic assessment of a biogas-based oxidative coupling of methane (OCM) process. Biogas is frequently utilized as a renewable energy source within small scale combined heat and power plants or as a natural gas substitute. The activation of methane also enables its utilization as a feedstock to produce chemicals. In this sense, the OCM process allows for the direct conversion of methane into ethylene, which is a major building block for the chemical and polymer industries. Biogas resulting from the anaerobic digestion of vinasse, a liquid effluent from bioethanol industry, is treated for contaminant removal and its methane content is converted into ethylene, which is then purified as the main product. The biogas cleaning process is assessed based on literature data, while an experimentally validated simulation model is used to assess the OCM process. A techno-economic evaluation is then performed through a Monte Carlo simulation, wherein uncertain parameters take random values between reasonable bounds. The net present value results positive in 74% of the cases, indicating that the project is profitable under a wide range of scenarios. Some performance improvement opportunities have been identified and highlighted to guide future studies in the topic.

关键词: biogas conversion     ethylene production     oxidative coupling of methane     feasibility study    

Dissolved methane in anaerobic effluent: Emission or recovery?

《环境科学与工程前沿(英文)》 2022年 第16卷 第4期 doi: 10.1007/s11783-022-1537-4

摘要: Various anaerobic processes have been explored for the energy-efficient treatment of municipal wastewater. However, dissolved methane in anaerobic effluent appears to be a barrier towards the energy and carbon neutrality of wastewater treatment. Although several dissolved methane recovery methods have been developed, their engineering feasibility and economic viability have not yet been assessed in a holistic manner. In this perspective, we thus intend to offer additional insights into the cost-benefit of dissolved methane recovery against its emission.

关键词: Anaerobic treatment     Municipal wastewater     Dissolved methane     Methane recovery     Carbon emission    

垃圾填埋场气体产生及其模型研究

黄文雄,彭绪亚,阎利

《中国工程科学》 2006年 第8卷 第9期   页码 74-79

摘要:

对填埋气的回收利用,既能减排温室气体,又能回收能源。分析了填埋气产生的原理和过程,对目前出现的填埋场产气模型进行了分类,并系统地分析了各种产气模型的计算方法、优缺点以及适用条件,为填埋气体的大规模利用提供可靠的方法。

关键词: 填埋气     模型     产气速率     产气量     甲烷    

USING NUTRITIONAL STRATEGIES TO MITIGATE RUMINAL METHANE EMISSIONS FROM RUMINANTS

《农业科学与工程前沿(英文)》 2023年 第10卷 第3期   页码 390-402 doi: 10.15302/J-FASE-2023504

摘要:

● Microbial fermentation in the rumen is a main source of methane emissions.

关键词: nutritional strategy     mitigation     microbe     methane     ruminant    

标题 作者 时间 类型 操作

Enhanced methane production during long-term UASB operation at high organic loads as enabled by the immobilized

期刊论文

propionate-oxidizing microflora and its bioaugmentation on anaerobic wastewater treatment for enhancing methaneproduction and COD removal

Chong Liu, Jianzheng Li, Shuo Wang, Loring Nies

期刊论文

ALKALINE PRETREATMENT AND AIR MIXING FOR IMPROVEMENT OF METHANE PRODUCTION FROM ANAEROBIC CO-DIGESTION

期刊论文

Production of hydrogen from fossil fuel: A review

期刊论文

Degradation of polyacrylamide (PAM) and methane production by mesophilic and thermophilic anaerobic digestion

Mona Akbar, Muhammad Farooq Saleem Khan, Ling Qian, Hui Wang

期刊论文

Impact of food to microorganism ratio and alcohol ethoxylate dosage on methane production in treatment

Yulun Nie, Xike Tian, Zhaoxin Zhou, Yu-You Li

期刊论文

Thermochemical pretreatment of meat and bone meal and its effect on methane production

Guangxue WU , Zhenhu HU , Mark G. HEALY , Xinmin ZHAN ,

期刊论文

Optimization of microwave pretreatment of lignocellulosic waste for enhancing methane production: Hyacinth

Bai-Hang Zhao, Jie Chen, Han-Qing Yu, Zhen-Hu Hu, Zheng-Bo Yue, Jun Li

期刊论文

低透气性煤层群无煤柱煤气共采理论与实践

袁亮

期刊论文

High-solid anaerobic digestion of sewage sludge: achievements and perspectives

期刊论文

Enhanced methane recovery and exoelectrogen-methanogen evolution from low-strength wastewater in an up-flow

Zechong Guo, Lei Gao, Ling Wang, Wenzong Liu, Aijie Wang

期刊论文

Techno-economic evaluation of a biogas-based oxidative coupling of methane process for ethylene production

Alberto T. Penteado, Mijin Kim, Hamid R. Godini, Erik Esche, Jens-Uwe Repke

期刊论文

Dissolved methane in anaerobic effluent: Emission or recovery?

期刊论文

垃圾填埋场气体产生及其模型研究

黄文雄,彭绪亚,阎利

期刊论文

USING NUTRITIONAL STRATEGIES TO MITIGATE RUMINAL METHANE EMISSIONS FROM RUMINANTS

期刊论文