05645730 is referenced by 34 patents and cites 13 patents.

A process for treating acid wastewater containing heavy metals has been invented, the process including adding fly ash to the acid wastewater to reduce heavy metals content of the acid wastewater. In one aspect the acid wastewater contains soluble iron and adding fly ash reduces the level of soluble iron. In one aspect the acid wastewater contains sulfate ions and adding fly ash reduces the sulfate ion level. In one aspect solid silicate salts are added to the acid wastewater. Preferably undesirable very hydrous iron hydroxide precipitate is not formed. In certain aspects the pH of the acid wastewater is raised to an environmentally acceptable level. In one aspect the process is a batch process. In another aspect the process is a continuous process.

Title
Acid wastewater treatement
Application Number
391202
Publication Number
5645730
Application Date
April 29, 1996
Publication Date
July 8, 1997
Inventor
Ronnie D Gordon
Richardson
TX, US
Edward Malachosky
Coppell
TX, US
Agent
Guy McClung
Assignee
Envirocorp Services & Technology
TX, US
IPC
C02F 1/64
View Original Source