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Twente University – Limitations, improvements and alternatives for the SDI

Limitations, improvements and alternatives for the SDI, PhD thesis by A.M.M. Al-hadidi

The ASTM introduced the Silt Density Index (SDI) as a standard fouling index to measure the fouling potential due to colloidal and suspended particles. For decades, the SDI is worldwide accepted and applied. There are growing doubts about the predictive value of this parameter.

In addition there are several deficiencies observed, affecting the accuracy and reproducibility e.g. no correction factor for temperature, nor for variations in membrane resistance, and no linear correlation with the concentration of colloidal/suspended particles. This thesis gives an overview of work on limitations, improvements and alternatives for SDI.

Limitations, improvements and alternatives for the SDI

Twente University – Towards optimal saving in membrane operation

Towards optimal saving in membrane operation, PhD thesis by W.J.C. van de Ven

This work aims at the development of methods for fingerprinting filtration processes. These fingerprints can potentially be used to optimize the filtration performance of large scale dead-end hollow fiber ultrafiltration systems that are used nowadays in the production of drinking water. The developed methods can be split into two major parts: Filtration process monitoring and feedwater characterization.