Batch Reverse Osmosis Explained: How a Work Exchanger Cuts Energy

At a glance. In batch RO, the concentrate is recirculated and the applied pressure rises only as fast as the osmotic pressure. A Tech Inc. Batch RO Test Skid lets researchers measure the energy saving on real water.

The phases

1. Pressurisation: the high-pressure pump drives feed into the work exchanger, pushing concentrate through the element while permeate is produced.

2. Purge: at the target recovery, the concentrate is flushed out.

3. Refill: the work exchanger resets and the next batch starts.

Why a work exchanger

A free piston or bladder separates fresh feed from concentrate, so the batches do not mix and energy is not lost.

What to measure

• Pump power and specific energy per cubic metre.

• Recovery and permeate quality per cycle.

• Cycle time and dead time.

• Comparison with closed-circuit and conventional RO on the same water.

Frequently asked questions

Is batch RO used at full scale? It is mainly a research and early-adoption technology; test skids help prove it for specific waters.

Ask mail@techincresearch.com about a research configuration.