Plas-Stick: Three 16-Year-Olds Turn Tamarind Waste into a Microplastic-Removal Tool

Why this invention attracted attention

Plas-Stick is unusual because it tries to solve a difficult water-treatment problem without relying on a powered filtration unit, pressure membrane, large treatment plant or sophisticated laboratory equipment. The three Indian students behind the project developed a biodegradable powder made from discarded tamarind seeds. According to The Earth Prize, when the powder is mixed into water it attracts and binds microplastic particles into larger, visible clumps. A handheld magnet can then be used to remove those clumps from the water.

The project won the Asia regional title in The Earth Prize 2026 and subsequently became the competition's Global Winner on 29 May 2026. The Earth Prize reported that roughly 23,000 people participated in the public vote that selected the global winner from seven regional teams. Vivaan Chhawchharia, Ariana Agarwal and Avyana Mehta were all 16 at the time, and the team became the first Global Winner from India.

The environmental problem: microplastics in everyday water systems

Microplastics are plastic particles smaller than 5 millimetres, with the smallest particles extending into the micrometre and nanometre range. They can originate as deliberately manufactured small particles or form when larger plastic items fragment through sunlight, heat, friction and weathering. Once dispersed, they are difficult to remove because the particles vary widely in size, density, polymer type and surface chemistry.

The Plas-Stick team says its idea was shaped by a visit to a rural community where drinking water was commonly stored in shared plastic containers and advanced filtration was not available. This influenced the design goal: the treatment had to be inexpensive, simple and usable without electricity or complex machinery. That design constraint is one of the most important features of the project because many high-performance microplastic-removal technologies depend on membranes, pumps, high pressures, chemical dosing or centralized infrastructure.

How Plas-Stick works

Graphic/demo: The official Plas-Stick media kit linked in the sources section contains a three-phase demonstration showing powder addition, mixing and magnetic removal of the formed clumps.

What is not publicly disclosed: The public Earth Prize descriptions do not provide the full chemical formulation, processing method, magnetic additive (if any), particle-size distribution, dosage, mixing time, pH dependence, or detailed mechanism by which the tamarind-derived material becomes magnetically recoverable. Therefore, descriptions that go beyond "tamarind-derived biodegradable powder that binds microplastics and is removed with a magnet" should be treated cautiously unless the team publishes a technical paper, patent or full protocol.

• Waste tamarind seeds are processed into a biodegradable treatment powder. The official competition material identifies discarded tamarind seeds as the feedstock.
• The powder is added to contaminated water. It interacts with dispersed microplastic particles.
• The particles aggregate. Instead of remaining as difficult-to-see individual particles, the microplastics become incorporated into larger clumps.
• A handheld magnet removes the aggregates. The Earth Prize demonstration shows the clumps being attracted and removed magnetically after mixing.
• The captured material is separated from the water. This turns a dispersed-pollutant problem into a solid-waste handling problem, which is generally easier to manage operationally.

What has been demonstrated

The strongest public evidence is currently a prototype-level demonstration and competition documentation rather than a peer-reviewed engineering paper. The Earth Prize shows the three-step visual process and states that the material binds microplastics into visible clumps that can be removed with a magnet. The project has also been taken into workshops and demonstrations; The Earth Prize reported that the team had reached more than 8,000 students and teachers by the time of the global award.

That educational reach is important, but it is different from full-scale water-treatment deployment. Public sources available as of August 2026 do not provide an independently verified percentage removal efficiency, contaminant mass balance, treated-water flow rate, repeat-use cycle data, or performance across multiple polymer types and real-world water chemistries. Those are essential measurements for evaluating whether the technology can move from a successful prototype into a dependable water-treatment product.

Why tamarind waste is an interesting starting material

Tamarind seeds are an agricultural and food-processing by-product. Plas-Stick tries to remove plastic pollution while creating value from an existing organic waste stream. Plant-derived polysaccharides and seed materials are widely studied as natural coagulants, flocculants and adsorbents because their surfaces can interact with suspended particles. Plas-Stick applies that broader idea specifically to microplastic aggregation and couples it with magnetic recovery.

The environmental benefit depends on the complete life cycle. A future commercial version would need to demonstrate that processing the tamarind material does not introduce harmful residues, that the magnetic component is safely contained or recoverable, and that the captured microplastic-rich waste is disposed of or recycled without simply transferring contamination elsewhere.

Awards, funding and development trajectory

• Earth Prize Asia Winner, 2026: Plas-Stick received US$12,500 as a regional winner to develop and implement the idea.
• Earth Prize Global Winner, 29 May 2026: Selected after a public vote involving about 23,000 voters; first global-winning team from India.
• Mentoring/advice: The Earth Prize says Dr. Rajesh Khandelwal advised the team to strengthen testing and development. Secondary reporting also describes research support from Indian academic contacts.
• Outreach: More than 8,000 students and teachers reached through workshops and demonstrations, according to The Earth Prize.
• Scale-up plan: The team has discussed decentralized production hubs and expansion into rural communities across India.

What still needs to be proven

• Removal efficiency: A percentage removal result should be measured for defined polymer types, sizes and starting concentrations.
• Real-water performance: Natural organic matter, salts, clay, microbes and other particles can compete with microplastics and change aggregation behaviour.
• Small-particle limits: Performance should be characterized from visible microplastics down toward very small microplastics and nanoplastics.
• Residuals: Treated water should be tested for any tamarind-derived or magnetic-material residues.
• Waste handling: Captured microplastics must be safely collected, recycled or destroyed.
• Cost per litre: A real cost model should include seed collection, processing, magnetic material, packaging, labour and disposal.
• Independent validation: Replication by an external laboratory would greatly strengthen the evidence.

Why Plas-Stick matters

The project's strongest idea is not that it has already replaced industrial filtration; it has not. Its importance lies in simplifying the microplastic-removal workflow. Instead of forcing water through a fine membrane, Plas-Stick attempts to make the contaminant easier to remove by changing the physical form of the pollutant, from dispersed microscopic particles into magnetically recoverable aggregates. If that mechanism proves robust across realistic water conditions, it could become useful for point-of-use or community-scale treatment where electricity, maintenance capacity and replacement filters are limited.

It is also a good example of youth-led design shaped by the intended user environment. The team did not start with a high-cost laboratory technology and attempt to reduce its price afterward; it started with the constraint that the solution should work with minimal infrastructure.

Evidence note

Evidence note: Plas-Stick is a promising youth-developed prototype with strong competition documentation and public demonstrations. As of August 2026, a peer-reviewed paper or independently replicated full performance dataset was not identified in the sources used for this article. Claims about exact removal percentages or proprietary chemistry should therefore not be inferred.

Sources

• The Earth Prize , official Global Winner announcement (29 May 2026)

  Official competition announcement, project description, or media resource. (LINK_ONLY)

• The Earth Prize , Asia Winner announcement and demonstration description

  Official competition announcement, project description, or media resource. (LINK_ONLY)

• The Earth Prize , Plas-Stick media kit (images, demonstration media and pitch assets)

  Official competition announcement, project description, or media resource. (LINK_ONLY)

• Mongabay India , reporting on the team and rural-use motivation

  Reported profile or project reference supplied with the research draft. (LINK_ONLY)

• The Week , profile and reported academic support

  Reported profile or project reference supplied with the research draft. (LINK_ONLY)

• The Cool Down , August 2026 follow-up coverage

  Reported profile or project reference supplied with the research draft. (LINK_ONLY)