在不同的C/N比率下评估有氧/无氧丰富效率:从废弃活性污泥中生产聚酸酸盐
Antonio Mineo1, Mark M C van Loosdrecht2, Giorgio Mannina1
1Engineering Department, Palermo University, Viale delle Scienze ed. 8, Palermo 90128, Italy.
Water research
|November 2, 2024
概括
使用污水污泥生产聚酸酸盐 (PHA) 的有氧盛宴/无毒饥荒策略表明,较低的碳比降低了PHA产量. 这种方法也导致了大量的氧化排放,质疑其大规模的可持续性.
科学领域:
- 环境微生物学 环境微生物学
- 生物技术是生物技术.
- 废水处理 废水处理
背景情况:
- 聚酸酸盐 (PHA) 是一种可生物降解的聚合物,具有多种应用.
- 过度的污水污泥发酵可以产生PHA前体.
- 空气性盛宴/无毒性饥荒是一种丰富PHA产生微生物群落的策略.
研究的目的:
- 评估不同碳 (C/N) 比率对PHA生产和工艺性能的影响.
- 在不同的C/N条件下评估污染物清除和N2O排放的效率.
- 在试点规模上调查PHA生产的有氧盛宴/无毒饥荒战略的可持续性.
主要方法:
- 使用发酵废物活性污泥作为碳源的试点规模研究.
- 实施一种有氧盛宴/无毒饥荒丰富策略.
- 监测PHA含量,C/N比率 (1,2,3.5gCOD/gN),污染物的去除,以及N2O排放.
主要成果:
- 污泥中的PHA含量分别为20%,24%和36% (w/w),其C/N比分别为1,2和3.5gCOD/gN.
- 最低的C/N比率 (1) 产生了最高的化和脱效率 (77-89%),但也产生了最高的N2O产量 (0.77毫克N2O-N/L).
- 尽管C/N波动和高影响度,但保持了高碳和氨去除效率 (≥80%).
结论:
- 在有氧盛宴/无毒饥荒策略中较低的C/N比率会降低PHA的产生.
- 该战略实现了高污染物去除,但导致了大量的N2O排放.
- 这些发现引发了人们对这种PHA生产方法全面实施的整体可持续性的担忧.
相关概念视频
01:26Microbial Bioremediation of Hydrocarbons
136
Bioremediation is an environmentally sustainable process that employs living organisms—primarily microorganisms—to degrade or neutralize pollutants from contaminated environments. In oil spills and hydrocarbon pollution, bioremediation involves the use of hydrocarbon-degrading bacteria to transform toxic compounds into less harmful substances. This approach leverages natural microbial metabolic processes and is considered both cost-effective and ecologically favorable compared to...
136
01:25Production of Organic Acids
105
Lactic acid, an important organic acid extensively applied in food, pharmaceutical, and biodegradable polymer industries, is primarily produced via microbial fermentation. This method is favored over chemical synthesis due to its environmental sustainability and capacity for enantiomerically pure product formation. Among various microbial processes, the fermentation of starch-based substrates stands out due to the abundance and renewability of raw materials like corn and potatoes.Hydrolysis of...
105
01:27Bioplastics
67
Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
67
01:25Biofuels
107
The microbial conversion of organic matter into biofuels holds potential as a renewable energy source. Among biofuel sources, microalgae are recognized as a highly efficient and adaptable feedstock for biodiesel production, owing to their rapid biomass accumulation, elevated lipid productivity, and capacity to proliferate in diverse aquatic systems, including freshwater, marine, and wastewater habitats. Unlike terrestrial crops, microalgae do not compete for land and can achieve significantly...
107