Cationic Coagulant (Inorganic)
DF-781 is an aqueous solution of inorganic cationic coagulant. It is effective for increasing the particle size of precipitated metal compounds typically produced in industrial wastewater treatment.
DF-781 is recommended as a treatment chemical for effluents, where the metals have been precipitated by hydroxide, sulfide, dithiocarbamates (DF-610, DF-640, and DF-650), ferrous sulfate, and sodium borohydride.
The product can be used in combination with an anionic polymer to further enhance settling rates. It is excellent for use in continuous flowing processes that employ gravity clarification or membrane microfiltration as well as to enhance settling and filtration in batch treatment of concentrates.
Depending on the specific application, the optimum concentration of DF-781 to achieve rapid settling and superb liquid clarity is determined by jar testing. The concentration of the various wastewater contaminants, such as, suspended solids, total dissolved solids, COD, BOD, and oil and grease, all affect the optimum DF-781 dosage. DF-781 is effective over a wide pH range (4.0 to 11.0).
Addition of DF-781 is controlled by volumetric feed, proportional to the wastewater feed rate. DF-781 can be added prior to, during, or after the metal precipitation step. The optimum addition location depends on the waste composition and the equipment available to perform the precipitation.
When used in a gravity settling system, DF-781 is usually used in combination with a high molecular weight anionic polymer that is added in a later reaction tank after the DF-781.
Laboratory evaluation is recommended to determine the optimum conditions for use of DF-781. Duraflow LLC will provide onsite technical support to assist with the treatability study.
- Rapid settling and superb liquid clarity
- Effective over a wide pH range (4.0 to 11.0
- Highly effective where precipitated metals have been treaded by hydroxide, sulfide, dithiocarbamates, ferrous sulfate, or sodium borohydride
- Enhances precipitation when used in combination with an anionic polymer
Physical Data (Typical)
Appearance: Clear liquid
Specific gravity (H2O = 1): 1.09
Density: 9.14 lbs/gal
Solubility in water: Complete
Freeze point: 22°F
Flash point: Not applicable
Stability: Stable under normal conditions