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Membrane Surveillance and Optimisation

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Download Introduction to Membrane Surveillance and Optimisation
CMS’s Membrane Surveillance and Optimisation products identify the incidence of organic and inorganic membrane fouling and determine the optimum flux and cross-flow velocities to minimise fouling and thereby maximise membrane performance.

CMS monitors membrane conditions during clean-in-place (CIP) and de-scaling operations, allowing CMS and plant operators to better assess the effectiveness of these treatments.

Our products apply Electrical Impedance Spectroscopy (EIS) to delineate the condition of the critical layer adjacent to the membrane where fouling occurs and allow the establishment of a positive feedback loop for optimal membrane performance.

Positive Feedback Loop

CMS Membrane Surveillance and Optimisation

CMS utilises two systems to acquire membrane data:

  1. CMS eModule; or
  2. CMS Replicator

The Replicator was the initial system employed during product development. The Replicator is currently available and has application for water treatment facilities with identified fouling issues or to evaluate what-if scenarios.

The CMS eModule is currently in development and is illustrated on the left. It will supersede the Replicator for most applications. CMS eModules have embedded EIS sensors and, save for the passive sensors and connections, will be identical to the existing modules used in the subject plant. CMS will provide its technology to be incorporated in modules from all major membrane suppliers. CMS recommends using at least two eModules per train – one for each stage. They will be inserted into selected pressure vessels and operate alongside existing standard modules. EIS data will be wirelessly transmitted through the pressure vessel wall, thus preserving the structural integrity of the pressure vessels.

The CMS Replicator is a small, integrated flow-cell, flow management system and impedance spectrometer. The CMS Replicator creates a mini RO facility to replicate conditions in the train to which it is connected. A small volume of feed water is diverted from the train to the Replicator. Flow conditions are matched to ensure that the fouling behaviour of the Replicator’s membrane is highly correlated to the fouling behaviour of the associated train. The system’s accuracy and utility has been verified through extensive commercial and laboratory testing.

CMS Replicator

Replicator Circuits

CMS System

CMS System

The EIS data acquired by the chosen surveillance system are analysed using CMS’s proprietary algorithms and the trend and current status of membrane fouling conditions reported to clients on a regular basis.

Product Development, Testing and Validation

The CMS technology was developed, and has been extensively tested, in laboratory conditions at the University of Sydney and the Nanyang Technological University in Singapore.

Industrial trials have been completed at the Bedok NEWater facility in Singapore and in 2016 CMS and Veolia Water commenced a full commercial trial and economic evaluation of the CMS Replicator at the Fairfield Water Treatment Plant in Sydney.

CMS holds an exclusive license to the patent for the application of EIS to determine critical flux of an RO process.

The critical flux is defined as the lowest flux when no or negligible fouling occurs. CMS has developed a proprietary impedance spectrometer and the algorithms used in conjunction with the licensed technology to interrogate the EIS data to provide real-time surveillance of membrane surface conditions and determine whether or not the flux is below the critical flux.

Download Introduction to Membrane Surveillance and Optimisation