Method for reforming slow filtration pond, reforming system for slow filtration pond and scraper device

摘要

PROBLEM TO BE SOLVED: To improve the efficiency of reforming by simplifying the device so that sand can be left as much as possible to scrape away unwanted materials and facilitate discharging of unwanted materials to facilitate disposal of unwanted materials. Try. SOLUTION: The slow filtration basin 1 having a filter layer 2 and a side wall 3 for accumulating water and filtering the water by the filter layer 2 to purify the water is reformed, and an unnecessary substance F on the surface of the filter layer 2 is modified. A scraper device S including a scraper 10 for scraping off the water, a water supply unit 11 for supplying water to the filtration basin 1, and a drain port 12 provided at an upper portion of the filtration basin 1 for discharging inflowing water, The waste material F scraped off by the scraper 10 of the apparatus S was floated in the accumulated water so as to be discharged together with the water discharged from the drainage port 12, and the scraper 10 had an outer surface that abuts the surface of the filtration layer 2. It is composed of a mesh-shaped expanded metal 16. [Selection diagram] Fig. 1