How do I make use of a scrapped CCD sensor from a scanner?
Some hints from experience:


try to somehow to identify the CCD sensor and get the datasheet. Without that it will be very hard to do anything reasonable. The only work around would be to analyze live signals while the scanner is still working.
try to reuse as much of the electronics as possible. E.g. level shifters, signal conditioning. Also the ADC may be reusable.


If you want some ideas about a project reusing a CCD line sensor have a look at this article which was published in the German Computer magazine c't or at the original project page (both in German).