Saturated saltwater contains a small amount of organic matter, with a COD level of 1000–2000 mg/L; what impact does this have on electrolysis?
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As the title suggests: Saturated saltwater contains a small amount of organic matter, with a COD level of 1000–2000 mg/L. What impact does this have on electrolysis? What are the main hazards?
How much is a small amount of organic matter? If it is less than 1PPM, then it is within the limit. Chemical oxygen demand (COD) refers to the amount of oxygen required to oxidize the organic matter in one liter of wastewater using potassium dichromate under strongly acidic conditions; it can serve as an approximate indicator of the amount of organic matter present in the wastewater. COD is an important indicator for measuring organic pollution in water bodies, and it can reflect the degree of pollution in those waters. Chemical oxygen demand (COD) can be used as an indicator to measure the amount of organic matter in water. The higher the chemical oxygen demand, the more severe the pollution of the water body by organic substances. COD is between 1000 and 2000 mg/L – this value is also too high; the amount of organic matter must be extremely high as well.
High levels of organic matter can increase the cell voltage and reduce current efficiency.
Thank you! I once heard a university professor say that electrolysis can remove certain organic substances; it’s possible to achieve this at levels of several hundred ppm, or even just 1 ppm. I’m not sure if this is feasible, and I have some doubts. Do you have any experience in this area that you could share?
High levels of organic matter can increase the cell voltage and reduce current efficiency.
Hundreds of ppm is achievable; even just one ppm, I’m not sure if that’s possible. — Dozens of ppm aren’t enough either
The required TOC level of the brine fed into the electrolyzer is generally less than 10 ppm, as electrolysis breaks down a small portion of the organic substances. Our company usually has levels of 6–9 PPM, and these levels decrease by 2–4 PPM after electrolysis.
Macromolecular organic substances can block the membrane channels, causing the membrane voltage to rise and reducing current efficiency.
What if it’s a small organic molecule?
Thank you! After water treatment, the TOC level remains around 70 ppm. It is certain that these are small-molecule organic substances (phenols). What would happen if electrolysis were carried out directly?
I uploaded a document on the effect of organic substances on ion membranes; you can take a look