Sporadic Sand Filters
The treatment active in the case of intermittent fine sand filters applies the sewerage, that has already undergone primary treatment, onto the filtration system beds of wastewater yellow sand filter at regular periods. By this, air can the actual interstices of the bed between the dose of sewage to provide the required aerobic bacteria.
The Sandfilteranlage of a layer of clean, razor-sharp sand, with an effective dimension 0. 2 – zero. 5 mm and of even coefficient 2 – five, 75 to 105 cms deep having under the canal, surrounded by gravel to carry from the effluent. The sewage is actually applied by means of a dosing container and siphon; it then moves into troughs laid within the filter bed. The troughs on the wastewater sand filter systems have side openings, that allow the sewage to circulation on the sand. To prevent any kind of displacement of sand prevents may also be used underneath the sewage channels. After an interval associated with 24 hours, sewage is now used over a second bedroom as the first bed rests. Generally, three to four water treatment mud filters may thus be applied in rotation. During the relaxing period, the dried sludge accumulating on the surface of filtering is scraped off. The actual organic loading is not weighty on the sand filter. Sewage application is only 0. 825 to 1. 1 million amounts per hectare per day.
It is found that the liquid from intermittent sand separate out is usually better in high quality than that resulting from every other type of treatment and can even become disposed of without dilution. However, because of the large property area required, a filtration system of this type is now rarely constructed in cities. They may be primarily suited for institutions, private hospitals, and other small installations.