Abstract: Provided is a filtration device used in order to improve the water quality of the final effluent in an advanced treatment facility for sewage and wastewater. The variable filtration device (10) of this type comprises a filtration tank (20), a filtration unit (30), a winding unit (50) and a filter cloth (12) arranged in such a way that the filtration conditions can be controlled by adjusting the number of turns of winding and the extent of pulling of the filter cloth in the chamber where the filtered water is formed, thereby allowing relatively easy porosity control as compared with the prior art, so enabling ready adjustment to the target water quality and water quantity even when the quality of the inflowing water varies.

Abstract: Provided is a filtration device used in order to improve the water quality of the final effluent in an advanced treatment facility for sewage and wastewater. The variable filtration device (10) of this type comprises a filtration tank (20), a filtration unit (30), a winding unit (50) and a filter cloth (12) arranged in such a way that the filtration conditions can be controlled by adjusting the number of turns of winding and the extent of pulling of the filter cloth in the chamber where the filtered water is formed, thereby allowing relatively easy porosity control as compared with the prior art, so enabling ready adjustment to the target water quality and water quantity even when the quality of the inflowing water varies.