초록

Heavy metal pollutant ions are precipitated from a wastewater stream as metal sulfides through the addition of a calcium sulfide mixture to the stream. Methods are disclosed for forming the calcium sulfide mixture and for controlling the amount thereof added to the wastewater stream.

대표청구항 ▼

A process for precipitating heavy metal pollutant ions from an aqueous solution to be treated, comprising the steps of: (a) forming an aqueous CaS mixture comprising Ca(OH)2 and Ca(HS)2 in solution; and (b) adding enough of the CaS mixture to said aqueous solution to be treated to precipitate heavy

A process for precipitating heavy metal pollutant ions from an aqueous solution to be treated, comprising the steps of: (a) forming an aqueous CaS mixture comprising Ca(OH)2 and Ca(HS)2 in solution; and (b) adding enough of the CaS mixture to said aqueous solution to be treated to precipitate heavy metal pollutant ions therefrom.