Water Treatment Problems

I can help you. Call me. Your RO system is not keeping up with the ion exchange ratio of the system.

Is the raw water source a surface water or a well water? I suspect that it's a surface water based on the information provided so far.

I don't think that RO is going to be helpful you. With such a high TDS you may have to provide tradition treatment unit processes, such as preliminary settlement followed by chemical dosing, flocculation & coagulation, and settlement. You must perform "Jar Testing" of various dosing chemicals to determine the most effective and economic ones for the treatment train.

You are a Civil Engineer specializing in Water Treatment, aren't you?

The recovery ratio depends upon the detailed design and configuration of the system, which in turn depends upon incoming water quality and flowrate.

Most, if not all RO membrane vendors provide software to enable the correct configuration to be determined with little effort. Do contact some and obtain at least one package to enable "what if" calculations and various schemes to be prepared. They can even be demonstrated to this client.

You'll need a two-stage RO system to reduce the TDS content first. This may require to be followed by a DI system should the second stage permeate TDS level still be too high.