Metodo para separar una precapa que contiene lodo de cal en una superficie filtrante de un filtro de disco o de tambor, donde la precapa es desprendida por medio de chorros de liquido pulverizado dirigido a la superficie filtrante sobre un raspador, luego la superficie es rotada en direccion opuesta con respecto a la direccion de rotación del proceso de filtracion.

摘要

A method associated for treating a precoat on a rotating filtering surface of lime sludge filter including: accumulating a precoat of lime sludge on the filtering surface by rotating the filtering surface in a first direction through a lime sludge slurry; after accumulating the precoat, rotating the filtering surface in an opposite direction to the first direction; while rotating the filtering surface in the opposite direction, spraying a liquid onto the precoat on the filtering surface wherein the spraying is applied to the precoat above a scraper adjacent the filtering surface and the spraying removes at least a portion of the precoat from the filtering surface, and flowing the removed precoat over the scraper and into a basin.