Humic acid in wastewater treatment is used to purify:
Toxic metals and their ions
Liquid organic substances
Humic acid can assist in removing toxic metals and their ions from wastewater. Added to dissolved air flotation systems, humic acid assists in the removal of trace amounts of grease, oil, liquid organics and suspended matter. Used in conjunction with watersoluble polymeric flocculants, humic acid is a special coagulant aid for the removal of soluble organics. It can also be used as potential fluid loss additive in certain types of organic liquids to prevent seepage from lagoons.
In the chemical treatment of waste water, calcium hydroxide or sodium hydroxide are used to aid precipitation of metals. Adding humic acid improves the process and lowers the concentrations of undesirable ions below the permissible limit. As stated above, it is also possible to use humic acid to remove toxic metals from water. The residual level of toxic metals in waste water after such a treatment is lower than 0.03 mg/L.
The highest effect can be observed in the removal of:
Aluminium, which is not a heavy metal but is toxic nonetheless, can also be removed from wastewater successfully with humic acid.
Humic acid is ideal as a sorption medium for a number of water impurities, and especially for heavy metals and liphophilic substances. Its properties include:
adsorption of liphophilic substances
high cation exchange capacity (CEC)
ability to form poorly-soluble complexes with polyvalent cations and heavy metals and their high electron exchange capacity.
In wastewater treatment, the process is based on the injection of a liquid humic acid solution in the ground water channel. There, humic acid creates a reactive wall in which harmful substances in ground water are dismantled. This method proves to be cost-effective, safe and environmentally friendly, requiring low investment and maintenance levels.
Despite being identical terms, our humic acid for water treatment is entirely different from the humic acids and their metal complexes that are considered to be water impurities. Our humic acid is unbound, high-molecular and free of residues as a result of an extraction process based on fermentation. “Problematic” humic acids are low-molecular humic acids and their residues.
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