Bio-microplastic filtration from wastewater

01Overview and value chain#

Markers EC: EU Single-Use Plastics Directive | OECD: environmental-biotech, circular-bioeconomy | Regulator: EPA (USA), REACH (EU)

Microplastic filtration from wastewater removes synthetic fiber and particle fragments — under 5mm, the standard regulatory cutoff — before they reach rivers, oceans, and drinking-water intake. A single household laundry load can shed over 700,000 microfibers; municipal treatment plants remove roughly 90-98% of influent microplastics through conventional sludge processes, but the remaining 2-10% still represents billions of particles discharged annually per plant. The commercial vendor base for dedicated microplastic capture — as distinct from general wastewater treatment that incidentally traps some plastic — is small: as of 2026 only a handful of companies sell products built specifically around fiber or particle capture, most still at pre-mass-market scale. This article documents that thin, real, and specifically bio/circular-economy-adjacent segment rather than the broader municipal wastewater industry, which already has its own coverage.

The key directions of bio-microplastic filtration are:

1. Point-source household filtration: in-line washing-machine filters that intercept synthetic fibers before they enter greywater, sold direct-to-consumer as a retrofit device, typically claiming 90%+ capture by mass.
2. Bio-based adsorbent media: engineered polymer or biopolymer sorbents (cyclodextrin-based, silica-biopolymer composites) designed to bind microplastic and co-occurring contaminants like PFAS in flow-through cartridges.
3. Municipal retrofit filtration: add-on filtration stages for existing wastewater treatment plants targeting the fraction that survives primary and secondary treatment.
4. Industrial pre-treatment: filtration at the point of discharge for textile, tire, and plastics-processing facilities, where influent microplastic concentration is orders of magnitude higher than municipal wastewater.

Sectoral value chain#

[Fiber/particle source] ──> [Capture media] ──> [Filtration unit] ──> [Captured solids]
                                                       │
                                            (treated water discharge)
                                                       │
                                                       ▼
[Solids disposal/reuse] <─── [Media regeneration] <───┘

Value chain levels#

Cross-cutting technologies of the sector:

• Mechanical mesh filtration: fine-pore physical screens (down to ~1-50 micron) that trap fiber and particle fragments by size exclusion.
• Molecularly-imprinted polymer sorbents: engineered adsorbent chemistry that selectively binds target contaminant classes, including some PFAS co-removal.
• Silica-biopolymer composite media: hybrid materials combining mineral and bio-based components for particle capture in flow-through systems.

02US#

The US market is anchored by a single confirmed dedicated vendor working at the adsorbent-media layer, alongside a much larger population of general wastewater-treatment companies for whom microplastic removal is incidental rather than the core product.

PFAS co-removal, DEXSORB media, municipal pilot programs#

• Cyclopure: commercializes DEXSORB, a molecularly-imprinted cyclodextrin polymer sold as a flow-through cartridge for combined PFAS and microplastic capture, marketed to both residential and commercial/municipal customers; DEXSORB received Massachusetts state approval for PFAS treatment in 2026.
• Municipal pilots: a small number of US treatment plants have piloted add-on microfiltration stages targeting microplastics specifically, but as of 2026 no additional dedicated-vendor product beyond Cyclopure was confirmed on a live screen.

03CN#

No Chinese vendor with a dedicated, confirmed microplastic-filtration product was found on a live screen in 2026 (both an English-named candidate search and a Chinese-language generic query returned zero name-specific hits). This does not mean no Chinese activity exists — China’s textile-manufacturing base is itself a major microfiber source, and academic/pilot-scale research on microplastic removal is active — but no commercial vendor cleared the confirmation bar.

Textile-source pollution context, academic pilot research, no confirmed vendor#

• Regulatory driver: China’s own wastewater discharge standards increasingly reference microplastic monitoring, particularly around textile-manufacturing clusters, creating latent demand this article cannot yet attach to a named commercial vendor.
• Reopen condition: if a Chinese vendor selling a dedicated microplastic-filtration product surfaces on a future screen, this section should be revised and the company added to the table.

04EU#

The EU has the strongest confirmed vendor base in this thin market, spanning both the household and municipal-retrofit layers, reflecting the EU’s earlier and more prescriptive regulatory push on microplastics (the Single-Use Plastics Directive and subsequent restriction proposals).

Household retrofit filters, PE-X silica-biopolymer media, municipal pilot integration#

• PlanetCare: a Slovenian company selling an in-line washing-machine microfiber filter (PlanetCare 2.0) direct to consumers as a subscription cartridge system, marketed as capturing the majority of shed synthetic fibers per wash.
• Wasser 3.0: a German company whose PE-X technology — a silica-biopolymer composite adsorbent — targets microplastic, PVA, and PFAS removal from municipal and industrial wastewater streams, with published claims of substantial cost and water savings versus conventional add-on treatment.

05Leading companies and research institutes#

06Tech stack and innovations#

The sector’s technology stack is split between mechanical size-exclusion filtration and engineered adsorbent chemistry, with the strongest commercial traction where microplastic removal can be bundled with a higher-value co-benefit (PFAS capture) or sold as a low-cost consumer retrofit.

1. Mechanical microfiber capture:
   • Fine-pore cartridge filters intercept fibers in the 1-50 micron range at the point of generation (the washing machine), avoiding the need for downstream treatment infrastructure.
   • PlanetCare’s subscription-cartridge model shifts the cost from a one-time device purchase to recurring media replacement, which is the dominant commercial pattern at the household layer.
2. Engineered adsorbent media:
   • Molecularly-imprinted polymers (Cyclopure’s DEXSORB) and silica-biopolymer composites (Wasser 3.0’s PE-X) bind target contaminants at the molecular level rather than relying purely on physical size exclusion.
   • Combining microplastic capture with PFAS removal in a single media strengthens the commercial case, since PFAS remediation carries more mature regulatory and funding support than microplastic removal alone.
3. Municipal integration:
   • Add-on filtration stages are designed to bolt onto existing treatment infrastructure rather than requiring a new plant, lowering the capital barrier for municipal adoption.
   • Regeneration and replacement economics remain the open commercial question across the sector — media lifespan and disposal cost are not yet standardized or independently benchmarked.

07Value chains and production pipelines#

Industrial pipeline of a municipal microplastic-retrofit filtration stage (EU Single-Use Plastics Directive)#

┌───────────────────────────┐      ┌───────────────────────────┐
│ 1. Influent characterization│ ───> │ 2. Media selection        │
└───────────────────────────┘      └───────────────────────────┘
                                                 │
                                                 ▼
┌───────────────────────────┐      ┌───────────────────────────┐
│ 4. Filtration/adsorption   │ <─── │ 3. Unit installation      │
└───────────────────────────┘      └───────────────────────────┘
              │
              ▼
┌───────────────────────────┐      ┌───────────────────────────┐
│ 5. Media regeneration       │ ───> │ 6. Effluent monitoring    │
└───────────────────────────┘      └───────────────────────────┘

Stage 1: Influent characterization

The treatment plant or facility samples influent water to quantify microplastic particle count, size distribution, and polymer type, establishing the baseline the retrofit stage must address.

Stage 2: Media selection

Based on the characterization, an operator selects between mechanical mesh filtration, adsorbent media, or a combination, weighing capture efficiency against media replacement cost.

Stage 3: Unit installation

The filtration unit — a cartridge system for household use or a larger flow-through module for municipal/industrial use — is installed at the point of discharge or as an add-on treatment stage.

Stage 4: Filtration/adsorption

Water passes through the unit; microplastic particles and fibers are captured by size exclusion, molecular binding, or both, with a small number of vendors also co-capturing PFAS.

Stage 5: Media regeneration

Saturated filter media is either cleaned and reused (where the technology supports regeneration) or replaced with fresh media, generating a solid waste stream that itself requires disposal.

Stage 6: Effluent monitoring

Treated water is monitored for residual microplastic concentration to confirm capture performance, an area where standardized measurement protocols are still maturing across the sector.