Influence of slow sand filter cleaning process type on filter media biomass: scraping versus backwashing - SEM images
Description
The use of backwashing in slow sand filters was developed to simplify slow sand filters cleaning process. This study aimed to assess biomass in backwashed slow sand filters and compare it with scraping. This data comprise Scanning Electron Microscopy (SEM) from slow sand filters filter media used in the backwashing study. Samples were taken before and after cleaning, and in different filtration depths (0 cm, 5 cm and 30 cm) from two types of slow sand filters, one scraped conventional slow sand filter (ScSF) and another backwashed slow sand filter (BSF). The micrographs here present shows different material attached to the sand used as filtration media, such as biomass. It was possible to conclude that biomass accumulate in the top filtration layers and scraping removed more biomass than backwashing. (v.2, title changed)
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Steps to reproduce
Samples were fixed with glutaraldehyde, dehydrated with alcohol and HDMS, dryed and golden coated.