Rendkup covers the flows of energy, matter, and waste through industrial systems — written for people who want to understand the mechanics, not just the headlines.
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Kalundborg vs. the Hype: A Direct Comparison
A skeptic-friendly breakdown of the Kalundborg industrial symbiosis network, comparing what it promises versus what it delivers with real figures.
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Two concepts often used interchangeably by consultants who should know better. Here is what separates them and why conflating them causes real planning mistakes.
Read the articleMore articles covering metabolic flows, lifecycle thinking, and industrial symbiosis are published regularly on the blog.
Browse all articlesThis archive has grown through a single editorial discipline: every piece either maps a real material flow, traces an industrial relationship, or analyses a published finding. Nothing fills column inches.
The areas that have received the deepest treatment are material flow analysis, urban metabolism, and the economics of secondary raw materials — precisely because they sit at the point where theory meets operational decision-making.
40+
Original articles
12
Scientific reviews
6
Core topic areas
2025
Publishing since
Six thematic clusters organise the full archive. Start from any entry point — each area has enough depth to be useful on its own, and enough connections to pull you further.
Material Flow Analysis
Quantifying how resources enter, move through, and leave industrial systems at regional and national scales.
Industrial Symbiosis
Exchanges of waste streams between firms — the mechanics of how Kalundborg-style networks form and persist.
Urban Metabolism
Cities as organisms — how throughput accounting reshapes infrastructure planning and waste policy.
Life Cycle Assessment
Methodological debates, boundary-setting problems, and real-world LCA applications across sectors.
Secondary Raw Materials
The economics and logistics of scrap, recyclate and residue markets — where theory meets commodity price.
Policy and Regulation
Extended producer responsibility, circular economy legislation, and what implementation actually looks like on the ground.
The nitrogen paradox: fertiliser efficiency and reactive loss in cereal systems
A close reading of mass balance data from three European grain-producing regions, with attention to where the numbers diverge from field-level expectation.
Read on the blogKalundborg twenty years on: what held, what frayed, what others miss
Revisiting the founding case of industrial symbiosis with more recent audits — the infrastructure dependencies that made it fragile and the trust dynamics that kept it running anyway.
Read on the blogUrban metabolism accounting: why Dublin's phosphorus budget does not close
Tracing the gap between inflow data and wastewater treatment outputs — a practical example of where metabolism studies hit data availability walls.
Read on the blogThe blog archive is arranged by topic. If you are coming to industrial ecology fresh, the material flow analysis cluster is the clearest entry point — it gives the vocabulary everything else builds on.
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The journal section reviews real published research — methodology, findings, and the gap between what authors claim and what the data supports. Author attribution on every review.
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A structured look at the steps behind environmental monitoring, written for readers who question whether these programmes produce reliable data or just generate paperwork.
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Saoirse Ní Bhriain
Editor, Rendkup
Every piece published here starts from a specific material, a specific number, or a specific system. Opinion appears only when it is grounded in evidence that has been named and linked. Hedging is preferred to overstatement.
The reader should be able to disagree with a conclusion and still find the article useful — because the data and the reasoning are both visible.
Complexity is not avoided, but it is not displayed for its own sake either. Jargon gets defined the first time it appears and then used without ceremony. The relationship with readers is one of intellectual honesty, not authority.
If the home page gave you a sense of the territory, the blog gives you the detail and the journal gives you the evidence. The about page explains who is writing it.