利用无氧基质分布来增长常流反应堆中的有氧颗粒污泥
Viktor A Haaksman1, Edward J H van Dijk2, Salah Al-Zuhairy1
1Delfluent Services, Peuldreef 4, Den Hoorn, 2635 BX, The Netherlands.
Water research
|May 3, 2024
概括
连续流反应堆 (CFR) 中的有氧颗粒污泥 (AGS) 可以升级废水处理厂. 这项研究表明,CFR中的AGS的营养物去除能力翻了一番,为现有系统提供了可行的改造解决方案.
科学领域:
- 环境工程 环境工程
- 微生物学 微生物学
- 废水处理 废水处理
背景情况:
- 使用有氧颗粒污泥 (AGS) 的连续流反应堆 (CFR) 越来越多地被探索用于现有废水处理厂 (WWTP) 的改造.
- 与活性污泥 (AS) 相比,AGS具有更高的沉降性,可以在不对CFR进行重大结构变化的情况下进行工艺强化.
- 成功实施需要复制AGS测序批量反应堆 (SBR) 中用于形成颗粒污泥的选择性压力.
研究的目的:
- 开发和评估一个模仿AGS-SBR颗粒化机制的试点规模的CFR,用于改造连续流动活性污泥 (CFAS) 系统.
- 评估无氧选择器设计对颗粒形成和营养物质去除效率的影响.
- 为了比较试点规模的CFR与AGS的性能与全规模的CFAS系统.
主要方法:
- 一个试点规模的CFR被建造并运行使用预先解决的城市废水.
- 无氧上游选择器 (2.5米水深) 被纳入,以创建AGS形成的选择性压力.
- 建立了衡量标准来评估颗粒度,并与全尺寸的AGS-SBR数据进行比较,重点关注无氧基质分布.
主要成果:
- 试验规模的CFR成功地产生了具有与全尺寸SBR相似的AGS特性的污泥.
- 与CFAS系统相比,和的体积去除能力增加了两倍.
- 完全混合的无氧选择器将EBPR活性转移到较小的颗粒大小,而化在很大程度上不受影响.
结论:
- 在上流选择器中通过底部料进行无氧选择性养,促进长期的AGS稳定性,特别是在较少酸化的废水中.
- 将现有的CFAS系统改装为CFR中的AGS是提高液压和生物处理能力的有希望的策略.
- AGS技术为升级废水处理基础设施提供了重大进展.
相关概念视频
Bioreactor Design and Operational System
220
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...
220
Bioreactor Controls-II
82
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...
82
Bioreactor Controls-III
70
Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...
70
Designing Growth Media for Bioreactors
84
Growth media provide essential nutrients that support cell growth and metabolism, thereby enhancing the yield of valuable products such as enzymes, antibiotics, and biomass. Designing an effective growth medium involves balancing all components to prevent nutrient limitations or toxic excesses, both of which can impair growth and reduce product yields.Composition of a Typical Growth MediumA typical growth medium contains carbon and nitrogen sources, salts, vitamins, trace elements, and...
84
Batch vs Continuous Culture
246
Fermentation is a foundational biotechnological process used to produce pharmaceuticals, biofuels, enzymes, and food additives. Among industrial strategies, batch and continuous fermentation are the two most widely applied. Although both rely on microbial conversion of substrates into desired products, they differ markedly in operation, productivity, and suitability for specific applications.Batch fermentation occurs in a closed system in which nutrient media and inoculum are added at the...
246
Scale-Up Processes
119
The scale-up of microbial fermentation processes is essential in industrial biotechnology, allowing the transition from laboratory-scale experiments to commercial-scale production while aiming to maintain product yield and quality. This process requires meticulous adjustment of equipment design, process parameters, and contamination control strategies to accommodate increasing culture volumes.At the laboratory scale, cultures are typically maintained in 1 to 10-liter glass or autoclavable...
119


