aluminum sulfate removal of heavy metal fluoride contamination

Wastewater containing fluoride and heavy metal pollution of water pollution in the two pollution hazards for humans and the environment can not be overlooked . The aluminum sulfate is such a common coagulant can remove heavy metals in sewage and fluorine pollution.
Aluminum sulfate application  magnesium hydroxide flame retardant in heavy metal wastewater aluminum sulfate is actually a heavy metal chelating agent to polymer processing technology of heavy metals and inorganic fluorine reagent processing technology combined with an extremely simple approach . And symbiotic aluminum sulfate precipitation method using the principle, containing arsenic, fluorine and heavy metals and heavy metal zinc borate flame retardant  waste generated by adjusting the pH precipitation method symbiosis removed.
The fluorine-containing aluminum sulfate aluminum sulfate treatment method applied fluoride concentration on high or larger flow of wastewater, if the individual dosing calcium fluoride , precipitation is very slow , and the flocculant alone will increase the cost of processing , so commonly used is first using chemical precipitation, aluminum sulfate and then adsorbent or coagulant treatment, so fluorine content down to 10 mg / L or less. Chemical precipitation method is relatively simple, easy to handle , low cost effective, mainly for treatment of high concentration fluoride wastewater . Coagulation law generally applies only to lower fluoride wastewater treatment . Adsorption method is mainly applied to a small quantity of process water .
Heavy metals in wastewater treatment technology and red iron oxide  precipitation, soda sulphide , iron salt method , chelate resin method , etc. are the most frequently used and aluminum sulfate precipitation method . Currently both aluminum sulfate and heavy metal fluoride removal from wastewater and examples of new technologies , but are rare. The use of polymer heavy metal chelating agent / inorganic reagents while removing heavy metals from wastewater and fluorine. Aluminum sulfate as a chemical coagulant , may be used for the treatment of waste water containing fluorine is low , the adsorption of heavy metal pollution of subsidence . The large amount of fluoride wastewater treatment , you can use aluminum sulfate plus lime, or together constitute polyacrylamide coagulant chemical adsorption precipitation treatment method for processing.