Seaweed aquaculture has long been recognized as a nature-based climate solution, with farm sediments burying about 1.87 tons of carbon dioxide equivalent per hectare annually—roughly twice the rate of adjacent non-farmed areas. Yet scaling this practice to the open ocean has been stymied by strong currents that prevent stable attachment and dilute essential nutrients like nitrogen, phosphorus, and dissolved iron. Now, researchers at Zhejiang University, with collaborators at Guizhou University and the Ningbo Innovation Center, have designed a modular, origami-inspired system that could overcome these obstacles, according to a study published (DOI: 10.1016/j.ese.2026.100769) on 28 September 2026 in Environmental Science and Ecotechnology.
The Seaweed Origami-inspired Aquaculture System (Seaweed OAS) draws on the traditional Chinese huiwen (fret) pattern to fold flat panels into a 25-sided variant pentagonal unit. Twelve such units assemble into a dodecahedron-like shell. Each module combines an origami-inspired shell, an internal nutrient space, a central buoyancy ball, and connection seats. The geometry is controlled by a dimensionless scaling ratio φ = a/R, where a is the auxiliary-circle radius and R is the base-circle radius. Simulations tested φ values from 0.28 to 0.56, identifying φ = 0.36 as optimal for a single unit. At a current speed of 2.0 m s⁻¹, this design produced 2,607.7 cm³ of suitable growth volume—where streamwise velocity is ≤0.5 m s⁻¹—and the best single-unit result reached 2,791.6 cm³, 17 times larger than a spherical reference.
The implications for scalability are significant. In a six-unit Hexagon 2 layout with 0.35 m spacing, total suitable volume reached 33,210.3 cm³ at 2.0 m s⁻¹, or 5,535.1 cm³ per unit, 2.1 times that of an isolated unit. This cooperative wake interaction, where upstream units shield downstream ones, amplifies performance per unit. The modules were 3D-printed with polylactic acid and water-soluble polyvinyl alcohol supports. Compression tests yielded a minimum peak load of 11,693 N against a predicted peak drag of 39.9 N, a safety factor of 293. Laboratory, lake, and an open-ocean trial in the Philippine Trench region confirmed the system stayed afloat and stable, even during wave impacts.
Global mapping estimated 10,335 million hectares—28.5% of the global ocean—as potentially suitable for deployment. The authors note that the design turns an ancient folding idea into a practical marine tool. "By reshaping flow around each module, the system creates quiet microhabitats where seaweed can attach and grow, while the same module stores slow-release nutrients," they said. If validated over longer deployments, the Seaweed OAS could support open-ocean seaweed cultivation for food, feed, biomaterials, and carbon sequestration without existing offshore infrastructure. Connection modules with controllable degradation could eventually let the system break apart so carbon-rich biomass sinks to the deep ocean for long-term storage, though shipping lanes, ice cover, temperature, nutrient ratios, flow speed, and marine protected areas must guide siting. The authors caution that long-term cultivation outcomes, deep-ocean carbon storage, and ecological effects of material degradation remain unverified and require field study. For more information on related innovations, visit http://chuanlink-innovations.com.
