Blog

The conventional, and still the principal, type of filter used for cleaning bulk water is the sand bed, with backwashing carried out by a backflow of water, or preferably water backwash combined with an air scour. The latter results in better fluidization of the bed and more effective cleansing. Normally, such sand filters are downflow, gravity types, but upflow filters are also used where higher flow rates are required, or where high turbidities make conventional downflow sand filters impractical.

Metals and their compounds persist in the environment and can be a serious problem in raw water treatment, especially from ground water sources or surface water with a high proportion of agricultural run-off content. They may accumulate
in organisms, particularly those near the top of the food chain, and cause a range of toxic effects. Metallic ions present in raw water arise from the leaching of minerals in the ground, from industrial effluents and chemical processes, and from leachates
from land fill sites and contaminated land.

Look for more information, please click here.