A challenge for a waste water treatment plant (WWTP) is to effectively separate phosphorus from the outgoing water, but also how to recycle the phosphorus that ends up in the sewage sludge. There are some developing and developed solutions out there today, but many of them offers only a small recycling potential for the phosphorus in the waste water/sewage sludge. In addition, the recovered phosphorus products are often not compatible with the requirements and needs of the farmers, i.e. not well known fertilizer products. The consequence is that it’s hard if not impossible to get a monetary value from the phosphorus in the sewage sludge.
EasyMining has a process called Ash2Phos that can extract phosphorus from ash of incinerated sewage sludge. The main advantage of the Ash2Phos process is that it produces well known products that today are commercially traded and accepted in agriculture. In addition, the process extracts more than 90% of the phosphorus from the sewage sludge ash and at the same time produce iron chloride and aluminium sulfate (precipitation chemicals). The catch is that the Ash2Phos process doesn't directly use sludge but needs ash of incinerated sewage sludge for its process.The positive side is that almost all phosphorus in the sludge is recovered and that there is no need for new investment in the WWTP.