With Enhanced Forward Flow Flush, filtration experts at GEA have developed a mechanical system that significantly reduces water and sewage capacity requirements as well as energy use when compared to conventional systems. In addition to these savings, the CIP process is further simplified. This is because the hydraulic configuration for flush is the same as what is used for chemical recirculation. This new patent-pending system provides the most significant benefit for low pressure applications, such as microfiltration and ultrafiltration.
From a design perspective, the concept hinges on utilizing partially diluted permeate from early filtration stages as a pre-flush to downstream stages. This means that all stages are flushing at one time, utilizing diluted flush from a prior stage. Flow is forward and in a downstream direction and flush reading is automatic. Only the final stages of permeate and system retentate are sent to drain, resulting in significant water savings. This method can be applied to any crossflow membrane filtration system consisting of two or more stages in series. It can also use any combination of stage permeate collection, as long as permeate is re-injected downstream from the stage where it was collected. An inline pump with downstream valving is used to collect and re-inject the permeate. This is required for each re-injection stage.
The Concept
From a design perspective, the concept hinges on utilizing partially diluted permeate from early filtration stages as a pre-flush to downstream stages. This means that all stages are flushing at one time, utilizing diluted flush from a prior stage. Flow is forward and in a downstream direction and flush reading is automatic. Only the final stages of permeate and system retentate are sent to drain, resulting in significant water savings. This method can be applied to any crossflow membrane filtration system consisting of two or more stages in series. It can also use any combination of stage permeate collection, as long as permeate is re-injected downstream from the stage where it was collected. An inline pump with downstream valving is used to collect and re-inject the permeate. This is required for each re-injection stage.
Performance
The amount of water and time saved by using Enhanced Forward Flow Flush depends on multiple parameters but is mostly influenced by membrane area. The larger the installation, the more water can be saved. In some cases, water consumption can be cut in half.
Benefits:
- Reduces water consumption – preserves this resource throughout the filtration process, benefiting the environment and reducing operating costs.
- Lowers utility costs – water supply, sewage and electric costs are impacted.
- Easy to use – flushing by sensor reading is automatic.
- Improves safety – eliminates risk of residual chemicals after any modification in CIP or change of flow.
- Increases time available for production – the system reduces CIP time, allowing more time to process product.
