On a world wide scale, the reserves of phosphate ore are becoming more and more scarce. The easily explorable ore reserves will dry up in the near future, while the quality of the ore is decreasing. It will become more expensive to extract phosphate ore in the coming years and duet o the increasing scarcity, the price will increase considerably.
The reserves of explorable ore are limited. The problem of the phosphate scarcity becomes clearer by the day and re-use gets more and more attention. Phosphate that arrives at the WWTP in the waste water, is removed from the water and ends up in the sludge. Upon further processing of the sludge (incineration), the phosphate is lost. Besides, due to the presence of phosphate, struvite is formed in the sludge process, which causes excessive wear and tear to the installations.
The removal of phosphate from the sludge, gives, besides the ever rarer phosphate as a raw material, also a higher gas production, a sludge that can better be dewatered and it avoids excessive wear and tear to the installations. The project will investigate the feasibility of possible techniques for the recovery of phosphate in the four WWTP’s of the Delfland Water Board.