Quote:
Originally Posted by brownrexx
Compost with biosolids can contain heavy metals (lead, cadmium, mercury, etc) which can not be composted out.The facility should be able to provide you with a certificate telling you if it has been approved for vegetables. they may even have lab tests available but you have to ask or find them online at their website if they have one.
I think that there are different classes of composts which tell you if they are veggie safe I think that they are class Class A and Class B. You can google it.
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Quote:
Originally Posted by Labradors2
I wouldn't use it because of the heavy metals. I prefer to aged compost from herbivores.
Linda
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Heavy metals can't be "composted out", but...... it can be removed in a "green" manner. Look up phytoremediation or biosorption + heavy metals + algae. It's not commercial... yet..., there are a few places doing on smaller scale. It's been used in a few cases to clean up mining wastewater, accident spills, oil contamination of groundwater, etc...