Can we send our CIP solution direct to the waste water treatment plant after cleaning our Reverse Osmosis System?

No, pH extremes can be very disruptive to bacteria and can upset the operation of the wastewater treatment plant.  The RO cleaning solution should always be neutralized prior to sending to a wastewater treatment plant.  The solution is usually considered “neutral” in most cases if it is within a pH 5 – 9 range, however, always follow local regulations and comply with your discharge permits.