Trickling filter
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A trickling filter is a type of wastewater treatment system. It consists of a fixed bed of some material, such as rocks, coke, gravel, slag, polyurethane foam, sphagnum peat moss, ceramic, or plastic
A trickling filter plant in the United Kingdom: The effluent from the primary settling tanks is sprayed onto a bed of coarse gravel (Benfleet Sewage Treatment Plant)
Broken trickling filter unit at the sewage treatment plant in Norton, Zimbabwe, showing importance of maintenance to prevent structural failure
Vermifilter
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A vermifilter is an aerobic treatment system, consisting of a biological reactor containing media that filters organic material from wastewater. The media also provides a habitat for aerobic bacteria
Trickling filter
…ciliates and amoeboid protozoa, annelids, round worms, insect larvae, other microfauna. (If annelids are abundant, the filter may be considered a vermifilter.) This is very different from many other biofilms, which may be less than 1 mm thick. Within the biofilm, both aerobic and anaerobic zones can exist…
Domestic sewage vermifilter showing accumulated contents (composting worms exposed)
Primary treatment domestic vermifilter with solids pile on surface (comprising feces and toilet paper) sitting on vermicast humus substrate (1m2 surface area)
Twin chamber constructed primary treatment vermifilter fed by a domestic flush toilet
Secondary treatment domestic vermifilter for wastewater showing ventilation around basket and pine bark media