A post ozonation is a huge consumer of electrical energy, the goal is to optimize the delivered dose and optimize operating costs.
I think the only method is to make laboratory experiments that simulate the treatment. Apply different doses of ozone and investigate the resulting quality of the water.
To estimate very roughly the dose without the laboratory experiment I would normalise the ozone applied in similar facilities to the treated waters dissolved organic carbon (DOC).
Consider if you truly wish to use ozone for primary disinfection. The installed cost, and operating costs, are much higher than using UV disinfection. Ozone also will oxidize any dissolved organic compounds into more biodegradable components, that can contribute to biogrowth, MIC, nitrification and other biological issues in the distribution system. Many water treatment treatability engineers apply ozone earlier in the process to enhance coagulation, or following coagulation and upstream of filtration (BAC), then apply UV for primary disinfection.
To answer your question, there is extensive discussion of typical doses, and dose determination, in "Ozone in Water Treatment: Application and Engineering" (1991) ISBN: 0-87371-474-1. It is an excellent reference, and can help you determine if your need is to improve organic removal, reduce DBPs, improve filtration or achieve primary disinfection.
Depends on the full treatment process. (ie Contact time, Raw water characteristics - organic & inorganic & biological growth - algae, coagulation, filtration etc.). Some of this relates to ozone demand. The ozone demand must be satisfied for optimum results. Sometimes setting a dose can be a little trial and error. What may occur in jar tests may not be directly carried over to real life conditions. See the paper I just published on "Extending the life of Activated Carbon Filters". It talks about Ozone dose, Powdered Carbon, TOC, DOC, SUVA and biological filtration etc. Ozone byproducts (Bromate) may also play a role in dosage setting, especially the pretreatment stage. Also CT credit is not given for pretreatment unless a residual is maintained through out the process. You may get a CT credit for post treatment, but residual may not last long and some other disinfection may be needed.
I think you could take time interval samples to measure your pybroducts and do 3 or four expreminets with different ozone doses until you achive your optimum condition,
or you can stop your expremint at specific time to save electricity and energy and try to remove the rest of by products by other low cost treatment technology.
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