| http://www.w3.org/ns/prov#value | - in the wastewater circuit to a level sufficient to precipitate solids including lead and zinc; b) concentrating suspended solids in the underflow stream; c) communicating the concentrated solids of the underflow stream to a holding vessel; d) adding lime and limestone to the underflow stream in the holding vessel and allowing the underflow stream to settle; e) removing supernatant from the underfl
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