The W2AREX® collects, filters and matches offers and demands of wastewater and bio-wastes by- or recovered products such as pure water, bio-electricity and bio-fertilizers for which wastewater-based epidemiology can be tracked.

Orders can be planned and priced years ahead of deliveries as a way of protection against volatility, scarcity, and risks.

BUYERS of outputs from bio-refineries can: 

  • plan and secure their sourcing at cheaper costs than classical alternatives
  • benefit directly from the reduction of environmental, social and economic risks and from more virus detection in wastewater
  • get solvent and organized sales thanks to our Back2You rewarding scheme.



SELLERS of products or services embedding inputs from bio-refineries or PROVIDERS of bio-wastes and of wastewater can:

  • get the best plans and deals for their products derived from wastewater and bio-wastes
  • benefit from our organized sourcing of wastewater and bio-wastes via our Back2You Rewards
  • reduce marketing costs and gate fees. 

Please find hereafter our list of products and complete our form for your orders or supplies:

About 97,25% of the water on our planet is the form of oceans and seas (source PricewaterhouseCoopers, 2012).

Water demand will exceed water resource availability by 2030 according to the Word Economic Forum.

Water, H2O is implicitly the most traded good as water footprint or unavoidable input of goods or services. About 70% of the water used at global level is for agriculture and 15% for energy. The Water Footprint (see ISO 14046) measures the consumption and contamination of freshwater resources.

Water is essential to the existence of human beings, the flora and fauna. Water is therefore not just an economic good but also a social and environmental good. Reusing wastewater avoids polluting the environment and decreases conflicts and pressures on that limited resource.

In a world that can no longer take ample, secured and unpolluted water supplies for granted, we help our clients to manage their water costs, exposures and not miss any wastewater reuse opportunity. 


There are 3 types of reclaimed water available for sales/purchase through our platform:

  • drinkable water,
  • Super Pure Blü water is free of bacteria, virus and/or micro-plastics and is filtered at 8 nano meter level (to compare: the smallest known viruses, MS2 measures about 27 nanometers and the diameter of the Corona virus ranges from 50 nm to 140 nm),
  • treated wastewater for irrigation as per ISO 16075.

Wastewater and bio-wastes carbon-negative biorefineries can generate more energy than needed for up-cycling 

Waste-to-energy can have many interconnected environmental benefits, such as reducing the emissions and pollution.

Decarbonised Biogas and Bio-electricity can be available on

  • PPA Power Purchase Agreements and other types of contracts
  • Biomethane certificates (or Biomethane Guarantees of Origin, Renewable Gas Guarantee of Origin, Green Gas Certificates) issued for each MWh of biomethane injected into the grid
  • Storable energy in batteries, biofuels (e.g. from algae grown on wastewater) and/or in hydrogen.


Gold, silver or other metals can be recovered from wastewater (see:

For example, chromium used in metal-plating industries or leather tanning can be recovered in wastewater thanks to specific filters and technology. Chromium-6 (hexavalent chromium) bath can be re-used/re-cycled for several cycles of plating or dyes by filtering iron and other contents. This also enhances the quality of plating. The sludge that comes out after filtration can then be recycled safely into clean water and/or biogas and/or other outputs.

Every year, drains and sewers carry more than 16 million tons of dissolved nitrogen and 3 million tons of phosphorus. Four-fifths of the first element and half of the second are supplied by human urine, and the resource isn’t simply wasted: This global excess of nutrients goes on to nourish dangerous levels of plant growth and increase oxygen demand in the waters, restraining aquatic life, e.g. in oceans.

Wastewater is typically enriched with nutrients from human, manure and food waste. These resources can be recovered as a result of treatment. Nutrients such as phosphorus and nitrogen can be converted into fertilizer while also reducing environmental risks such as eutrophication (when excess nutrients enter water bodies and cause algae bloom).

Recovering nutrients from wastewater is key toa healthy food security and sustainability. 

- Phosphorus is used for fertilizers, as an animal feed additive, treatment of metals, batteries, fire extinguishers, etc.

- Sodium is washed out from rocks and soils. Many laundry detergents use sodium salts as fillers, adding significant sodium to the wastewater. Lighter than water, sodium conducts heat and electricity easily and is used for batteries.

- Ammonia in wastewater is a contaminant and hazardous to the environment. Ammonia in a fuel cell is nonetheless energy dense in volume and comparable to hydrogen in performance.

Transforming wastewater sludge into bio-cements can:

  • decrease the cement industry greenhouse gas emissions
  • reduce long distance transport of this construction material
  • enhance the durability of building materials and structures

Polymers can be recovered from oily wastewater and/or generated from wastewater.

Organic material can be recycled as polymers for bio-plastics. For example, algae grown in wastewater from livestock farms, municipalities, distilleries, etc. can be transformed into biofuels or biopolymers. 

Methylene blue dye can be recovered from textile or tannery wastewater and reused e.g. to store and to produce energy. 

Recovery of silk sericin from the filature wastewater.

Sericin protein has high additional value in many industries such as textiles, pharmaceuticals and cosmetics.

Biochar can be produced from wastewater sludge pyrolysis (treatment in high temperature in a zero- or low-oxygen environment).


Biochar can be used

  • to filter wastewater
  • as a soil amendment for carbon sequestration, retaining water and improving crops
  • as an absorbent to remove toxic metals, organic pollutants, and pathogens from wastewater. 


CO2 credits are possible through biochar as carbon remover

Third-party independent audits enable to know


the CO2 carbon footprint has been sequestered and absorbed thanks to wastewater and bio-wastes up-cycling.  

EXAMPLE 1 Commodities enabling wastewater based epidemiology, carbon negative energy, reduced pollution and financial inclusion... driving competitive prices!

Source of the image: Hoekstra & Chapagain

A cotton T-shirt has an average water footprint of 2’700 litres (www.waterfootprint.organd according to ISO standard 14046). About 8 million tons of fertilisers and 200'000 tons of pesticides are used every year for cotton crops. 

To reduce production costs and risks, to secure markets and to add a positive value chain, the fashion industry, cotton traders or trade finance, insurers, investors and/or cotton users can prioritise products with inputs from transformed wastewater such as organic fertilisers, treated wastewater for irrigation and renewable energy. Those environmental friendly wastewater by-products are usually cheaper than the classical alternatives.

Prioritising inputs from transformed wastewater drives improved access to sanitation with routine virus detection in wastewater for early warnings,  monitoring and tracking.


EXAMPLE 2 Integrating externalities and reducing costs and risks.

Some risks can be consulted on Water Risk Atlas 

Commodity traders and/or insurers and/or finance can ask their suppliers, transporter and storage partners to source inputs from transformed wastewater such as bio-fertilizers, treated wastewater for irrigation or renewable energy for competitive differentiation.  This simultaneously secures markets by making sure that populations are safe and can get some basic needs covered by the value of their wastewater and/or of their wastes. 

Commodity traders and/or insurers and/or finance can ask their suppliers, transporter and storage partners to source inputs from transformed wastewater and/or bio-wastes such as bio-fertilizers, treated wastewater for irrigation, or renewable energy for competitive differentiation.

Examples enabling to correlate trade finance with wastewater transformation finance: The international coffee trade involves about 80 billion m3 implicit water exports; this is about 6% of the international virtual water flows in the world.
ICE [NYBOT] is trading coffee about 3 years ahead of deliveries: part of the water footprint for coffee could be allocated from wastewater transformed in decentralized bio-refineries. In addition to created access to sanitation and/or releasing of pressure on fresh water resources, this can generate energy e.g. for green mobility or transport and biochar enabling sustainable agriculture and carbon credits.



The W2AREX® filters the offers and the demands of treated wastewater, fertilisers and/or energy  to be delivered and off-taken at an agreed period and matched it with wastewater and bio-wastes supplies.

1kg of refined cane sugar has an average water footprint of about 1'400 liters (see and ISO standard 14046). The Buyer of treated wastewater for irrigation as per ISO 16075 might be the farmer or its client buying sugar. If, for example,  only 1% of water used to produce sugar comes from treated wastewater, a cargo of 20'000 tons of sugar can cover sanitation infrastructure for 13'698 people living near the sugar plant (1,5 m3/ton water footprint per 20'000 tons / 100 for only 1% of water used from treated water = 300'000m3 = 60 litres/day wastewater of that population during 365 days).

We link this to a program of housing equipped to harvest rain and floods water and become providers of  wastewater with quality enabling efficient circular economy and virus detection to prevent virus outbreaks. In case of necessary lock down in the wastewater collection area, the rewards are allocated to secure basic needs for isolation, sugar could be potentially supplied in that context (e.g. via State's public procurements for food security).  

Our solution has been designed to enable cities and estates to become more resilient and sustainable with impacts on:  

  1.  our health: by empowering citizens and/or corporates and/or municipalities for early warnings, monitoring and tracking through wastewater based epidemiology detecting the emergence of contagious diseases,
  2. our economy:  Back2You rewards  and reversing supply chains from waste to production and consumption. This can lead to:
  • green mobility and/or transport,
  • safe, local and sustainable food security,
  • security stocks of energy (e.g. hydrogen), clean water and other vital needs covered by the valuing and monetisation of wastewater and bio-wastes,
  1. our environment: greenhouse gas emissions, domino effects of drought/pollution/floods, blackout risks and/or other risks are cut through wastewater transformation with zero wastes. The local use of fertilizers and/or other biorefinery by-products are easier, greener and cheaper than if packaged and transported over long distances.  

Public procurement can drive national surveillance of virus outbreaks through routine detection in wastewater and massive leverage effects of transformed and rewarded wastewater and bio-wastes. For example; cotton bed sheets for public hospitals requiring should empower the United Nations Sustainable Development Goals through prioritizing inputs from bio-refineries (e.g. fertilisers, clean water and bio-electricity).

Public procurements through our services enable to turn interdependent risks into reduced: 

  • public expenses, 
  • pollution, resources scarcity and health risks,
  • unemployment.

Back2You rewards for municipalities to get funds for organising the collection of bio-wastes are possible if using biogas or electric vehicles rechargeable in bio-refineries.

source of picture: Alternative Perspectivessource of picture: Alternative Perspectives