Sodium persulfate (Na2S2O8) is a proven oxidant for in-situ chemical oxidation (ISCO) that can treat a wide range of contaminants including chlorinated solvents, petroleum-based chemicals and PAHs. It is ideal for quick, source zone and hot spot treatment.
Sodium persulfate can produce powerful oxidative (SO4•, SO4•, OH•) and reductive (O2-•) radicals capable of degrading recalcitrant compounds, including chlorinated ethenes (TCE, PCE, DCE and vinyl chloride), chlorinated ethanes (TCA and DCA), chlorinated methanes (carbon tetrachloride and methylene chloride), BTEX, MTBE, polyaromatic hydrocarbons (PAHs), Freons, PCBs, di/tri-chlorobenzenes, petroleum hydrocarbons (TPHs, GRO, DRO), 1,4-dioxane and pesticides.
S2O82- + initiator => SO4•, SO4•, OH• , O2-•
This reaction can be initiated by several methods, such as
- Transition Metals
- Chelated Metal Catalyst (e.g EDTA)
- Peroxides, and
These methods can be customized to the site conditions. Sodium persulfate is typically applied as a solution and is soluble up to 40% wt%. Typically, the active lifetime in the subsurface is days to weeks. When used as recommended, it is safe the handle and does not generate heat or gas.
Sodium persulfate can be injected by direct push (DPT), into fixed, injection wells and soil blending. Because one of the end products of this chemistry is sulfuric acid (H2SO4), it is important that all equipment that is in contact with the solution is compatible with strong acid.
55 lbs Bags and 2,204 lbs Bulk Sacks
- Wide variety of COCs treated
- Highly soluble
- Strong acid product
- Requires activation
Sodium Persulfate for soil and water remediation:
- Oxidation of Contaminants: Sodium persulfate can oxidize organic contaminants, breaking them down into less harmful substances such as carbon dioxide and water. This is achieved by electron transfer from the contaminants to the persulfate, leading to the degradation of the contaminants.
- Advanced Oxidation Process (AOP): Sodium persulfate can be used in an advanced oxidation process where it’s activated by heat, a base, UV light, or a catalyst (such as iron) to produce sulfate radicals. These sulfate radicals are very reactive and can oxidize a wide range of organic contaminants. This process is often referred to as persulfate oxidation or persulfate activation.
- In-Situ Chemical Oxidation (ISCO): Sodium persulfate is often used in ISCO, a process that involves injecting the oxidizer directly into the contaminated soil or groundwater. This can be an effective method for treating large areas of contamination and for reaching contaminants that are deep underground.
- Compatibility with Other Remediation Techniques: Sodium persulfate can be used in combination with other remediation techniques such as bioremediation or other chemical oxidation processes to enhance their effectiveness.