Cyanide Wastewater Treatment

Multiple options for flows with cyanide

There are multiple ways to treat cyanide in wastewater flows, each with different advantages. Saltworks can help you understand your options and implement the solution that bests suits your flow rate, concentrations, discharge limits, and other considerations.

Cyanide Uses and Risks

Cyanide is widely used in many industries and is an important precursor for many organic chemicals such as nitriles. In mining, cyanide is frequently used in the extraction of gold and silver. Cyanide also occurs in nature. Cyanide is carefully regulated in wastewater as many of its compounds are toxic. Fortunately, multiple treatment options are available.
mining tailings point-scaled cyanide
custom mining brinerefine build

Treatment Technologies

Treatment options for cyanide include:

  • Granular activated carbon (GAC) absorbs cyanide, but can result in relatively high costs for both the GAC consumable and its spent disposal. It is best suited for intermittent or seasonal cyanide flows.
  • High-pH bleach oxidation destroys cyanide, producing safe nitrogen gas. Bleach oxidation is well-suited for permanent, continuous, cost-effective treatment.
  • Iron precipitation uses ferrous sulphate to precipitate cyanide. It is also well-suited to permanent cyanide-laden flows.
  • Reverse osmosis (RO) is used to produce safe-to-discharge freshwater with low contaminant levels, including cyanide. The highly concentrated reject is easy to transport for offsite disposal or treatment.

Your Treatment Strategy

Saltworks offers all of the above treatment technologies. The right solution for your process will depend on flow rate, concentration, consistency, required discharge level, and other water chemistry factors.

 

High-pH bleach oxidation and iron precipitation can be performed by BrineRefine, our flexible, automated chemical treatment system.

RO systems for cyanide treatment require specialized knowledge and plant configuration. Our advanced, ultra-high recovery XtremeRO, may be an option.

 

We can help you to consider these options and decide on what is best for you and your project. Contact us with your project details to learn more.

Chemical Treatment BrineRefine for Mining

Related Products

3D render of a full-scale BrineRefine system with 2 modules and 4 reactors.

BrineRefine Chemical Reactor

BrineRefine is a continuous stirred tank reactor (CSTR) that executes diverse chemical reactions efficiently and with precision.

Related Resources

Mine Water Treatment
Application

Mining Wastewater Treatment

Saltworks provides comprehensive solutions for mining waters. We treat water, remove problem contaminants, achieve minimal liquid discharge (MLD) or zero liquid discharge (ZLD), and recover valuable metals as your project needs.

phenol molecule structure
Article

Removing Highly Toxic Phenolic Compounds: Wastewater Treatment Options

Excessive phenolic compounds are harmful to human health and the environment. Chlorophenols, by-products of chlorinating phenol-containing water, are carcinogens. A treatment system needs to be chosen and engineered carefully, with consideration of specific wastewater chemistry, operating conditions, and economics.

Selective ion removal for brine management
Solution

IonSelect Targeted Wastewater Solutions

Targeting specific ions for removal can be the most cost-efficient way to treat a wastewater flow. Saltworks has treatment and sensing solutions available to treat ions and other species, making water suitable for discharge or re-use.