Patent ID: 8002980

Claim:
A heavy metal collection system comprising: a former configured to be supplied with wastewater containing heavy metals and hydrogen sulfide, to react the heavy metals contained in supplied wastewater with the supplied hydrogen sulfide to form sulfide salts; an acquirer configured to be supplied with the sulfide salts formed by the former and hydrochloric acid, to acquire hydrogen sulfide and heavy metal ions produced by reactions between supplied sulfide salts and the supplied hydrochloric acid; a hydrogen sulfide supply line configured to supply the hydrogen sulfide acquired by the acquirer to the former; a collection line configured to collect the heavy metal ions acquired by the acquirer; a precipitator configured for electrolysis of the heavy metal ions from the collection line to deposit metals on an electrode; and an acid producer configured for use of chlorine gases produced by the electrolysis in the precipitator to produce the hydrochloric acid supplied to the acquirer.