They "must be undone, restored and then bound", he said -- a meticulous process that requires a great deal of "time and concentration".
Mabrouk al-Amin, a supervisor at the workshop, said the restoration process "requires a good number of artisans".
"Working with the book of God is very enjoyable and we don't get bored... there is an indescribable joy in this work," he said.
Restorers say they have repaired a staggering half a million Korans since the workshop opened in 2008, and more than 1,500 trainees have graduated from 150 restoration workshops.
In recent years, more and more women have been joining the ranks of the volunteer restorers.
"A large number of women were trained on restoring the holy Koran and today they have their own workshops," Drebi said.
One female restorer, Khadija Mahmoud, has even held training sessions for blind women.
"We would not have been able to think of doing this... were it not for this capable woman," Drebi added.
For Mahmoud, who trains women at a workshop in Zawiya, 45 kilometres (28 miles) west of Tripoli, restoring Korans in a women's workshop allows them to work comfortably and at a faster pace.
She added that the restoration work has given many women a meaningful way to fill their "spare time".
"A large segment of trainees and restorers are retirees," she said. "For them, there is nothing better than spending their spare time in the service of the Koran."
