Candle filter is a solid-liquid separator. Candle screen is a filtration media. Filtration takes place in a pressure tank. Liquid is driven into the candles and the solid phase remains on the filter media and form a uniform cake. Cake remains on the filtration media because of curved form of media (candles). Filtrate (liquid phase) is discharged after going through the candles from the top of the pressure tank. After cake formation to achieve more cake dryness; air blowing will be done. Vibrator and counter current air flow help to discharge the cake.
Candle filters can be used without pre-coating in the process. The advantages are as followed: