I do agree with most said, ...

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I do agree with most said, and it's important to get the water treated well, and it's crucial to get real-time insight of what's happening and when, as high COD can cause serious damage. Thus maybe continuous TOC(COD) monitoring is needed at some point. https://uk.hach.com/toc/family?productCategoryId=25114273658

It's very important to have the pH right, and dosing too high O2 for aeration of water to remove COD needs control, as too much is a waste of energy, but also the C:N:P: ration is important for best COD removal. Thus, pls. consult with some of our local Power- or Waste Water consultants from Hach in your region, and also take a look closer to the solutions we've for all the water utilities in Power under https://uk.hach.com/power-overview 

Bets of luck, trust this will do, and do not hesitate to reach-out.