Avista | Membrane Autopsy with CEI
The Avista Membrane Autopsy includes a physical dissection of an element to remove samples and supporting materials for laboratory and foulant analysis. This procedure identifies scaling or fouling problems, determines the proper cleaning regimen, verifies system operating conditions, and improves system performance. Avista Chromatic Elemental ImagingSM (CEI) is used to identify the location and relative concentration of elements in a foulant sample to resolve the primary sources of membrane fouling. In the CEI process, a beam of focused electrons is accelerated across the surface of a foulant sample causing each element to emit electrons. The X-ray patterns emitted are specific to every element, enabling each one to be individually identified. CEI then assigns a color to each element and produces a three-dimensional, high resolution image of the foulant sample. Element concentration is indicated by color intensity.
- CEI provides insight into the layering characteristics of foulants deposited on a membrane.
- By analyzing the layers, it is possible to understand the fouling sequence.
- When used in combination with Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS), CEI can reveal the interaction between inorganic, organic, metal oxide, and colloidal compounds.