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cover of episode Nature-Based Renewal: Exploring Aquaponics & The Future Of Sustainable Urban Farming

Nature-Based Renewal: Exploring Aquaponics & The Future Of Sustainable Urban Farming

2025/3/13
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Finding Genius Podcast

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Rolf Morgenstern
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Rolf Morgenstern: 我参与了一个欧盟资助的项目,旨在利用自然解决方案为城市废弃地寻找新的用途和生产力。我们通过水培法和城市农业等方法来提升这些地区的生产力。水培法的基本原理是将鱼养在循环水产养殖系统中,鱼的排泄物中的营养物质被用来种植植物,形成一个循环系统。然而,建立水培系统需要大量的努力和投资,并且需要对水产养殖和植物种植都有深入的了解。我们选择非洲鲶鱼是因为它生命力强,生产力高,并且可以在高密度下饲养,但由于当地法律限制,我们最终使用了欧洲鲶鱼。我们研究水培系统的商业模式,关注其经济可行性。温水鱼的代谢率更高,生长速度更快,例如非洲鲶鱼在28摄氏度下生长速度很快,只需6个月就能达到收获大小,而欧洲鲶鱼则需要12到14个月。水培系统从鱼苗到收获需要大约一年的时间,并且通常不会一开始就满负荷运转。通常情况下,不需要让鱼在水箱里繁殖,而是购买鱼苗进行养殖到收获大小再进行出售。在专业养殖罗非鱼的过程中,通常只饲养雄性鱼,以避免繁殖导致生长停滞。建立水培系统前需要根据鱼的种类设计相应的系统,包括鱼缸尺寸、水流量和过滤系统等。除了非洲鲶鱼、罗非鱼和欧洲鲶鱼外,虹鳟鱼、草鱼和鲰鱼等也适合用于水培系统。叶类蔬菜、草药和一些亚洲叶类蔬菜在水培系统中生长良好,而块茎类蔬菜则不太适合。我们使用的是水培系统,例如介质床系统、气动床流系统、深水栽培和NFT营养膜技术,并对系统进行了一些调整以应对水体浑浊的问题。我们使用机械过滤器去除固体物质,并使用生物过滤器将鱼的排泄物转化为肥料。我们的系统设计可以使水产养殖和水培系统在一定时间内分开运行,以便根据植物的不同生长阶段调整营养供应。生物过滤过程中会产生酸,导致系统pH值降低,需要通过添加物质进行pH值管理,并根据植物的营养需求选择合适的物质。水芹和薄荷在水培系统中生长良好,但大多数其他植物也能适应。水培系统是否需要在室内搭建取决于气候条件,在有霜冻的地区需要采取防冻措施,如果要全年生产则需要温室和人工照明。水培系统中鱼缸和水培系统的比例通常为1:10,即1立方米的鱼缸可以养活10平方米的水培系统。鱼的生长速度呈指数级增长,而植物的养分需求在夏季达到峰值,这在季节性气候地区可能导致养分供应与需求不匹配的问题。水培系统可以提高鱼的品质,但高品质鱼的生产取决于养殖技术,水培法只是增加了其可持续性。水培系统可以运行20到30年,甚至更久。水培养殖的利润率很低,投资高,需要较长时间才能达到收支平衡点。小型水培系统适合个人爱好者,而商业化水培则需要考虑规模化生产或直接营销两种模式。学习水培系统知识可以参考edX上的课程和美国水培协会的论坛。

Deep Dive

Chapters
This chapter introduces aquaponics, a sustainable farming method combining aquaculture and hydroponics. It discusses the project's goal of repurposing urban brownfields and highlights the initial investment and knowledge requirements as significant barriers.
  • Aquaponics combines fish farming and plant cultivation in a closed system.
  • Significant investment and expertise are needed.
  • African catfish were initially chosen for their sturdiness and productivity but were replaced due to local regulations.

Shownotes Transcript

In this episode, we dive into the world of aquaponics and urban agriculture with Rolf Morgenstern, a research associate at South Westfalia University of Applied Sciences) and a former member of the productive Green Infrastructure for post-industrial urban regeneration (proGlreg) Project). 

Always eager to use nature-based solutions for urban regeneration, Rolf uses his background in vertical/precision farming and aquaponics to enhance the sustainability of local communities…

Hit play to learn about:

How fish waste is recirculated through aquaponics systems to create nutrient-rich water. The financial and knowledge-based barriers associated with this research. Why catfish are so beneficial to regenerative agricultural practices. The role that PH management plays in eco-friendly food production.   Plants that do best in aquaponic systems.

If you’re curious about how regenerative design can drive sustainable innovation, tackle social and economic challenges, and create thriving communities, this conversation is undoubtedly for you. Join the discussion now to find out more about Rolf’s unique research – and click here) to follow along with his ongoing work!

Episode also available on Apple Podcast: http://apple.co/30PvU9C)

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