About: http://webisa.webdatacommons.org/101922688

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Conditions within the precipitator 40 must be maintained at low pH, i.e. 1-2, so that the iron is coprecipitated with the gypsum, without precipitation of other valuable metal ions.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com