Exploiting Liquid Assets
With global water stress an increasing worry to companies, governments and others, attention is focusing on how to conserve this precious natural resource. However, as materials scarcity becomes more evident, another question is now on the lips of corporate leaders and policymakers – what value can be extracted from waste water?
Of course, part of the challenge is to prevent water from being wasted in the first place. The oil industry, for example, generates large volumes of waste water.
“They separate the oil and water, and inject it back into a salt water disposal well a mile underground and it’s never used,” explains James Wood, chairman and chief executive of US-based ThermoEnergy. “That’s fine where you have enough water. But it’s not so good in west Texas, where they have very bad drought conditions.”
ThermoEnergy’s flash vacuum distillation technology is a physical-chemical process that uses temperature and reduced pressure to separate chemicals, metals and nutrients from waste water. This technology, argues Mr Wood, could be used to turn the waste water produced by the extractive industries into water that could be used by farmers, particularly in areas of drought.
However, waste water contains rich seams of chemicals and minerals, from nitrogen and phosphorus to propylene glycol and heavy metals. Once viewed merely as a costly or even toxic problem to be dealt with, waste water and the materials it contains are increasingly being viewed as a means of creating value.
Nitrogen and phosphorus, for example, can create purification and algae blooms in waterways. Yet they are also valuable materials in the manufacture of fertiliser.
For this reason, Vancouver-based Ostara Nutrient Recovery Technologies has developed a way of recovering phosphorus and nitrogen from municipal and industrial waste water, and transforms them into fertiliser.
“The technology is very much geared towards making a marketable product,” says Phillip Abrary, Ostara president and chief executive. “We’ve changed our mindset from seeing these things as a source of pollution to developing technologies that can take them out and turn them into something with the same or greater value.”
Many of Ostara’s clients are municipalities for whom the appeal is that they are able to tackle pollution on several fronts. While the technology enables the cleaning of waste water, the fertiliser Ostara produces with the recovered phosphorus and nitrogen is a slow-release product that, because it does not dissolve in water, prevents the run off of chemicals into surrounding rivers and waterways.
Read the full article online at raconteur.net