| http://www.w3.org/ns/prov#value | - d to lead and other hazardous metals in the soil, allowing the combination to pass safely through a child's body if eaten.The idea that sludge ??? the leftover semisolid wastes filtered from water pollution at 16,500 treatment plants ??? can be turned into something harmless, even if swallowed, has been a tenet of federal policy for three decades.In a 1978 memo, the EPA said sludge contains nutri
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