为高效无氧消化提供以压力为中心的调节:最先进的技术,挑战和前景
Ling Xu1, Jun Xu2, Weizhen Chen1
1Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China.
Bioresource technology
|September 5, 2024
概括
以压力为中心的调节提高了无氧消化 (AD) 的效率和生物气质量. 本综述探讨了高压无氧消化 (HPAD) 创新,机制和优化废物稳定和生物气生产的未来方向.
科学领域:
- 环境科学与工程环境科学与工程
- 生物技术和生物工程 生物技术和生物工程
背景情况:
- 无氧消化 (AD) 是一种可持续的生物废物稳定和生物气产生的方法.
- 传统的AD工艺往往遭受不完整的基质降解和低甲纯度.
- 以压力为中心的调节提供了一个有前途的策略,以提高AD效率和生物气质量.
研究的目的:
- 审查ex-situ高压预处理和in-situ高压无氧消化 (HPAD) 的创新.
- 批判性地研究HPAD的潜在机制,包括物理化学原理和微生物反应.
- 确定当前的局限性,并为HPAD技术提出缓解策略.
主要方法:
- 综合文献综述,重点关注无氧消化中高压应用.
- 在高压下分析物理化学反应原理和微生物群体动态.
- 审查现有的技术障碍和HPAD实施的潜在解决方案.
主要成果:
- 高压预处理和现场HPAD证明了增强基质降解和生物气产量的潜力.
- HPAD 影响微生物活动和代谢途径,从而改善生物气体成分.
- 关键的挑战包括能源需求,反应堆设计和工艺控制,并确定了潜在的缓解策略.
结论:
- 压力中心调节的AD,特别是HPAD,是优化废物管理和能源回收的可行技术.
- 需要进一步的研究来解决HPAD机制,建模和工程实践中的知识差距.
- 本综述为克服技术障碍和推进HPAD应用提供了洞察力.
相关概念视频
Environmental Applications of Microorganisms
1.5K
Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
1.5K
Amino Acid Catabolism
1.7K
Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...
1.7K
Microbes and Methanogenesis
84
Methanogenesis is a critical microbial process in anaerobic ecosystems responsible for the biological production of methane, a potent greenhouse gas and valuable biofuel. This metabolic pathway is primarily facilitated by methanogenic archaea, which thrive in anoxic environments such as wetlands, sediments, and animal gastrointestinal tracts. The absence of oxygen in these habitats prevents aerobic respiration, thereby favoring alternative biochemical pathways for organic matter degradation.In...
84
Bioreactor Design and Operational System
195
Bioreactors are engineered vessels designed to cultivate microorganisms under controlled conditions for industrial bioprocessing. They maintain sterility and allow precise regulation of pH, temperature, oxygen, and nutrient levels to optimize microbial growth and metabolite production. Bioreactors range from small laboratory units of 1 liter to industrial systems holding up to 500,000 liters, though only about 75% of their volume is actively used for fermentation. The remaining headspace...
195
Bioreactor Controls-I
93
Maintaining optimal conditions within fermenters is essential for maximizing microbial productivity and ensuring process efficiency. This lesson focuses on key parameters—temperature, foam, pH, carbon dioxide, oxygen, and pressure—and their precise measurement and control strategies in fermentation systems.Temperature ControlTemperature regulation is critical due to the exothermic nature of many fermentation processes. In small laboratory fermenters, temperature is commonly...
93
Bioreactor Controls-II
76
In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the...
76


