Sourcing or Selling Products from transformed Wastewater and Bio-wastes


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-fertilisers and 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 organised sales thanks to our Back2You rewarding scheme
SELLERS of outputs from bio-refineries can:
  • get the best plans and deals for their products derived from wastewater and bio-wastes
  • benefit from our organised sourcing of wastewater with content influenced through our Back2You Rewards for quality content enabling optimal up-cycling
  • reduced marketing costs. 


Please find hereafter our list of bio-refinery by-products and complete our form for your orders or your supplies enabling also to be exchanged with smart metered wastewater:

About 97,25% of the water on our planet is the form of oceans and seas (source PricwaterhouseCoopers, 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. The Water Footprint (see ISO 14046) measures the consumption and contamination of freshwater resources.


Water is essential to the existence of Human beings and of the flora and fauna. Water is therefore not just an economic good as it also a social and environmental good. Reusing wastewater enables to not pollute the environment and to release conflicts and pressures on that limited resource.

About 70% of the water used at global level is for agriculture and 15% for energy.

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:

  • potable 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 is ranging between 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.

In addition to bio-electricity, decarbonised renewable energy 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 such as pellets, biofuels (e.g. from algae grown on wastewater), hydrogen and/or in batteries.


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.

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

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

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

Every year, the drains and sewers carry more than 16 million tonnes of dissolved nitrogen and 3m tonnes 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.

- 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. Sodium is used in different forms; for example Sodium vapor is used in streetlights and produces a brilliant yellow light.

- 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 in 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 bioplastics. 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. 

Blue methylene may have a role in curing people sick from Covid19.

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 at zero- or low-oxygen environment)

Biochar can be used

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

CO2 credits are possible through biochar as carbon remover.

 The W2AREX market players can know 


the CO2 carbon footprint has been sequestered and absorbed thanks to wastewater transformation via third-party independent audits.


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.


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

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

Public procurement e.g. for army uniforms, bed sheets for public hospitals and for textile production inputs such as fertilisers should be aligned with the United Nations Sustainable Development Goals and be through the wastewater value chain to reduce related amounts and impacts.



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 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.  on 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. on our economy:  the W2AREX is rewarding wastewater content enabling efficient wastewater circular economy to reduce production costs ans risks. It enables also to reverse the supply chains from wastewater to productions and consumptions. 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 of wastewater.

3. on our environment: greenhouse gas emissions, domino effects of drought/pollution/floods, cyber risks and/or other risks are cut through wastewater transformation with zero wastes. The local use of fertilisers and/or other wastewater by-products are easier, greener and cheaper than if packaged and transported long distances.  


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-fertilisers, 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. 

Wastewater up-cycling in bio-refineries creates tremendous opportunities for circular economy and for investments in solid organic wastes and wastewater. 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-fertilisers, treated wastewater for irrigation or renewable energy for competitive differentiation.

Example enabling to correlate trade finance with wastewater transformation finance: the trades international coffee trade involves about 80 billion m3 implicitly 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 decentralised biorefineries. 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.