GreenForze - Phosphorous Recycling

Phosphorous Recycling

By the end of this century Phosphorous deposits with low concentrations of hazardous substances, primary cadmium and uranium, will be totally exploited. Phosphorouss cannot be substituted for plant nutrition by other substances. Thus, usage of secondary Phosphorous materials is becoming more and more important. Recovering phosphorus from ash enable the recovery of 80% of the inflow load to a municipal wastewater treatment plant (WWTP). The recovered phosphorus can be sold to the Phosphorous or fertilizer industry.

In an industrialised society, recovery of Phosphorous from sludge ash is most efficient. This was revealed during the International Conference on Nutrient Recovery from Wastewater Streams held in Canada in mid May 2009.

See http://www.nutrientrecovery2009.com for more information.

What we can offer is a both robust and cost efficient concept to recycle Phosphorus (Mono Calcium Phosphorous) from ashes - using an energy efficient wet-chemical process:

Click here for an overview of the process.

Brief Description of the Process
The recovery of the phosphorus content starts with leaching the ash with diluted hydrochloric acid in a stirred tank at ambient temperature. Elevated temperature results in an increased iron concentration in the resulting leach solution and shall be avoided. The leach solution is filtered and the filter cake is washed with water and then carefully de-watered. The liquid filtrate (leach solution), containing a precipitate of phosphorus, calcium and metal compounds, is passed to a purification step for selective metal recovery followed by Phosphorous precipitation.

Additional Revenue Streams
Recycling of Phosphorous from sewage saves energy (compared to manufacture and transport of fertiliser from Phosphorous rock) and can now bring operators 4 - 6 tonnes of greenhouse gas credits per tonne of fertiliser produced, or EUR 40-60 per tonne Phospate produced, with an expected price per CER of EUR 10. A 1 tonne ash per hour plant produces approximately 4500 tonnes of Mono Calcium Phosphorous per annum which adds another EUR 225 000 in revenues.

Gate Fees - Landfill Cost
In addition to the income streams from the production of fertilisers, carbon credits there is also normally a gate fee attached or an alternative landfill cost to the deposit of sewage sludge. Therefore it is recommended to combine the gasification of sewage sludge with the recycling of Phosphorous. The gasifcation cycle also generates power and heat that could be sold to the grid or used in the process.

For more information on our Phosphorous Recycling Concept, please fill in this form in the below or call Tomas Persson on +44 (0) 7549 95 93 94

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If you are interested in the making of pellets and/or briquettes,
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