Incineration of sewage sludge

Incineration of sewage sludge is an effective way of reducing the residual mass from waste water treatment plants (WWTP) with around 90%. One problem is what to do with the ash from the incineration? EasyMining provides the perfect solution!

The Ash2Phos process requires ash that comes from incinerated sewage sludge. We estimate that a phosphorus content in the ash of at least 4 % is needed for the Ash2Phos process to be economically viable. The consequence and benefit is that the sewage sludge doesn’t necessarily need to be mono-incinerated (around 9% phosphorus content), but also can to some extent be co-incinerated with materials that produce low amount of ashes. 

The circular phosphorus process created with the Ash2Phos technology

Fly ash from incinerated waste

Fly ash is formed during air pollution control in waste incineration plants. The fly ash normally contains heavy metals and on average 20% chloride salts and is therefore characterized as hazardous waste. There are different ways of how the fly ash can be managed and land filled. Some ways are worse than others when it comes to sustainability.

Through a unique patented method called Ash2Salt can EasyMining extract commercial salts from waste incineration fly ash. In the Ash2Salt process the fly ash is washed and from the wash water commercial grade potassium chloride, sodium chloride and calcium chloride as well as an aqueous ammonia solution are extracted. By taking away the chlorides, the amount of waste is reduced by on average 20% and the commercial salts can be returned to society so that the extraction of virgin resources can be reduced. The washed fly ash (residual sand 80%) are now considered a non-hazardous waste and can be used in, for example, the cement/concrete industry.

The Ash2Salt technology creates a sustainable and circular flow of resources