How to remove sulfate ions from wastewater
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We are currently working on a project related to food wastewater, with a sulfate content of 2000–3000 PPM. The conventional treatment process, which involves neutralization and adjustment, UASB, contact oxidation, and sedimentation, does not yield good removal results; the COD level in the treated water is around 1000, and the treatment facility emits strong odors. What solutions are available?
Try adding BaCl2; other methods such as concentration can also be used to produce sulfuric acid
Removing sulfate ions is quite difficult; if done, the cost will be very high. Common methods include evaporation and the addition of barium salts.
Wastewater with such high sulfate levels generates large amounts of hydrogen sulfide under anaerobic conditions, resulting not only in a strong odor at the site but also a risk of poisoning； Hydrogen sulfide has a low solubility in water, but it tends to aggregate; it is a highly toxic substance for the aerobic bacteria that follow. Generally, when the hydrogen sulfide concentration in water exceeds 25 ppm, it becomes difficult to operate activated sludge systems.