Iron in Aquaculture Ponds

Farmers often complain of loss of crop after heavy rain events. When the sludge is not disturbed and no additional oxygen (other than that provided by paddle wheels) is introduced, the pond usually remains relatively healthy with beneficial algae being the dominant species. But if the vibrio load is high in the pond, the chances of getting EMS will greatly increase. Heavy rains can disturb acid sulphate soils, as pyrite releases hydrogen sulphide (H2S) and iron (Fe2+). This soluble Fe2+ increases oxygen demand to produce insoluble Fe3+, while H2S is toxic to shrimp. This explains why heavy rains can cause stress in aquaculture ponds.

_{Source: P. Byrne, P. J. Wood & I. Reid (2012): The Impairment of River Systems by MetalMine Contamination: A Review Including Remediation Options, Critical Reviews in EnvironmentalScience and Technology, 42:19, 2017-2077 http://dx.doi.org/10.1080/10643389.2011.574103}

Why AQUA-Cal+ is an ideal solution for the flocculation and removal of iron (and other heavy metals)

• The hydroxyl ions (OH-) in the magnesium hydroxide Mg(OH)2 slurry react with the metal ions to form insoluble metal hydroxides.

AQUA-Cal+ can flocculate iron

AQUA-Cal+ can flocculate iron

2 Days after treatment

Cost comparison of AQUA-Cal+ with traditional treatments for iron

* The cost of traditional treatments was provided by one of our Vietnamese customers. Costs may vary by region and situation.

_{Source: Hoffman Environmental Inc., 2002, Wastewater Treatment System, Texas, USA.}