NONPOINT POLLUTION DECREASE APPARATUS AND NONPOINT POLLUTION DECREASE MATERIAL METHOD

摘要

The present invention relates to an apparatus for reducing non-point pollution. Provided is an apparatus for reducing non-point pollution which connects a pre-processing tank having a first filter body installed to collect large impure matter from rainwater being introduced with a filter tank having a second filter body installed to filter pre-processed water supplied from the pre-processing tank by a middle wall in order to form a circular or polygonal container, and supplies air to the second filter body and rapidly sends the water stored in the filter tank back to the pre-processing tank if no rainwater is detected or the amount of rainwater is decreased, causing the water level of the filter tank be equal to or lower than a predetermined value in order to reversely wash a filter injected into the second filter body. impure substance equal to or greater than a predetermined size and equal to or heavier than a predetermined weight is primarily filtered from rainwater in the pre-processing tank, the primarily-filtered pre-processed water is transferred to the filter thank to pass the filter for re-filtering, the filter is reversely washed after the filtering, and the reverse washing water is discharged by re-filtering, thereby discharging rainwater filtered in equal to or greater than 80% of annual average rate of removing suspended solid (SS).