Clean seeds.
Zero chemicals.

Seed decontamination through cold plasma

Dry Seed Treatment Machines

Atmospheric cold plasma
for seed treatment.

We build machines that use atmospheric cold plasma to eliminate pathogens from seeds — a completely dry process with no residues, no heat damage, no compromise on germination.

Discover our technology Get in touch
Hemeris Cold Plasma Treatment System
100% Dry treatment
1t/day Per machine
0 Chemical residues
Why Plasma

As good as chemicals — without added chemicals.

No chemicals

Zero chemical inputs, zero residues. Compatible with organic certification and export markets.

No thermal damage

Seeds stay below 35°C. No germination loss, no viability compromise.

No bacterial, no fungal resistance

Physical mode of action : pathogens cannot develop resistance to plasma treatment.

100% dry

No water, no drying step. Seeds are ready to use immediately after treatment.

Our Technology

Atmospheric Cold Plasma

A fourth state of matter that disrupts pathogens at the molecular level — while leaving seeds completely unharmed.

100% dry process

No chemicals, no water, no consumables. Just ionized air at atmospheric pressure — seeds stay completely dry.

Non-thermal process

Seeds never exceed 35°C. No thermal stress, no germination loss.

Zero residues

Clean seeds ready for organic certification and export markets.

Cold plasma treatment in action
How It Works

Three steps to clean seeds

Our industrial-scale process handles 150kg batches with consistent, measurable results.

01

Load

Seeds are loaded into our treatment chamber in controlled 150kg batches for uniform exposure.

02

Treat

Seeds pass through our plasma reactor where cold plasma eliminates pathogens.

03

Analyze

AI-assisted quality control confirms decontamination levels and optimizes treatment parameters.

Services

Treatment services & custom machines

We offer seed treatment services at our facility and build custom plasma treatment machines tailored to your production needs. Our dry treatment technology integrates seamlessly into your existing workflow.

1 Shipping
→
2 Processing
→
3 Quality Control
→
4 Delivery

Seed Treatment

Send your seeds to our facility for dry plasma treatment with full quality documentation and traceability.

Custom Machines

We design and build plasma treatment machines sized for your production capacity — from compact units to industrial scale.

Integration Support

Our team helps integrate the dry treatment process into your existing seed conditioning workflow.

Applications

Validated treatments

Our cold plasma technology has been tested and validated against these crop-pathogen combinations.

Bean Xanthomonas, Pseudomonas
Carrot Xanthomonas, Alternaria
Radish Xanthomonas, Pseudomonas
Brassica Xanthomonas, Pseudomonas, Alternaria
Beetroot Phoma, Cercospora, Pseudomonas
Cucurbits Pseudomonas, Xanthomonas
Lettuce Pseudomonas, Fusarium
Wheat Fusarium
Parsley Septoria
Corn salad Phoma
Tomato Pseudomonas
Team

Built by scientists & engineers

Leadership

Steven Deves-Girain

Steven Deves-Girain

CEO & Founder

CentraleSupélec-ESSEC. Founded Hemeris in 2021.

Olivier Battaglini

Olivier Battaglini

CTO

CentraleSupélec. Plasma systems & generators.

Damien Bodiot

Damien Bodiot

COO

EIGSI. Mechanical design & industrialization.

Plasma

Chih-Min Chen

Dr. Chih-Min Chen

Research Engineer

PhD Paris-Saclay. Cold plasma specialist.

Mike Kirkpatrick

Dr. Mike Kirkpatrick

Consultant

Prof. CentraleSupélec. PhD Florida State.

Microbiology

Dr. Mélina Cyrenne

Dr. Mélina Cyrenne

R&D Project Manager

PhD ENS Paris-Saclay. Microbiome expert.

Margot Valembras

Margot Valembras

Lab Technician

BTS Bioanalysis. Ex-LGPM laboratory.

Antoine Valembras

Antoine Valembras

Lab Technician

Microbiology lab support.

Engineering

Aleksandrs Kohno

Aleksandrs Kohno

Mechatronics Engineer

CentraleSupélec. Robotics & automation.

Martin Pham Van

Martin Pham Van

Electronics Engineer

CentraleSupélec. Ex-Safran Electronics & Defense.

Ready to eliminate chemicals from your seed treatment?

Let's discuss how cold plasma can work for your operation.

Contact us