Happy to see your prompt response!
For the study purpose, I suggest you to get following information from suppliers;
1. Water source and consumption per day
2. Factory operations (process flow chart) and production capacity
3. Effluent generation per day
4. ETP process flow/ technology
5. ETP treatment capacity
6. Effluent test report (inlet and outlet)
7. Legal requirements on ETP? (e.g. discharge quality parameters and limits).
8. Sludge disposal mechanism
We can decide our next step based on the above information.