UV vs. ozone treatment for suspended solids
asked 26 May 2017 asked by Nina D (570 points)
Both can do the job properly. Before choosing I think that you should evaluate the cost of each equipment and installation and operating cost and also limitation for each type of equipment taking into acccount the characteristics of your effleunt to be treated. The cost can fluctuate depending on the size of the plant and type of treatment. In the case of ozone, TSS and BOD levels will have impact on the cost of the system and it's operation. See the fact sheet of the USEPA on ozone system to help you. https://www3.epa.gov/npdes/pubs/ozon.pdf For the maximum TSS content for UV, it may change a bit from one supplier to another. I don't know the range so check with some suppliers. The fouling on the UV lamp will be affected by the type of treatment and chemical use so not only TSS can be a limitation. The fact sheet from USEPA can be of some use to give you idea on the subject. https://www3.epa.gov/npdes/pubs/uv.pdf
It all depends on the goal: reducing bacteria, neutralizing viruses, producing a chemical reaction?
It is to reduce fecal bacteria.
In that case, UV is more economical. A TSS concentration higher than 25 mg/L limits the performance of low-pressure UV disinfection systems.
Thank you for your replies. What are the parameters to consider when choosing between high and low-pressure lamps?
Hello floating_cover_expert, Thank you for your input. How do the products that you are promoting help respond to nina-d's initial question? Thank you.
By reducing the TSS concentration / "threshold", it allows more flexibility as to which method he may be able to use. Covers for TSS are cheap and have little to no maintenance, which greatly reduce the cost. If TSS concentrations are under 10 mg/L, which is pretty typical with a cover (we often see digit numbers), UV would be better and cheaper than ozone in the long run.
Thank you for this additional information.