Fish bones as a form of soil remediation?

Within the past year, new methods of  have been placed into effect, particularly those concerning the contamination of soils from lead. While many methods of soil remediation currently do exist, the newly practiced method includes that of depositing Alaska Pollock fish bones into soils with high levels of lead. The high levels of calcium phosphate present within the bones of the fish, migrate into the soils, whereby the lead then binds to the phosphates and forms pyromorphite. I think this method of soil remediation is particularly neat, especially as the fish bones would eventually be disposed of as waste, and through this method are able to be recycled. Additionally, the soil remediation process is complete within a matter of days, and is far more cost efficient than other means of remediation.

The image below shows a sack of crushed fishbone being worked into the soil to neutralize the lead.