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Upflow roughing filter

276 bytes added, 22:03, 21 May 2012

→‎Construction, operations and maintenance

After a year or more (depending on the turbidity of the raw water), hydraulic cleaning alone is no longer adequate, and the different filter layers have to be removed and cleaned, which requires several people. The filter should be cleaned before the turbidity of the raw water reaches a maximum (e.g. before the rainy season starts). Occasionally, the valves need to be repaired or replaced, and if a steel weir is used this may need to be painted or replaced. New caretakers can be trained by experienced technicians.

====Potential problems====

— High loads of organic and other suspended material in the raw water clog the filter and reduce the hydraulic cleaning capacity.

— Roughing filters only remove some of the solids and pathogens in the water, and additional treatment is needed.

==Costs==

'''Initial cost''': Reported construction costs are US$ 20–40 per m3 of water per day, for a structure designed to be in operation for 24 hours a day.

Winona

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