Effectiveness of sand media filters for removing turbidity and recovering dissolved oxygen from a reclaimed effluent used for micro-irrigation
Views
0% 0
Downloads
0 0%
Limited access
View/Open
Corresponding Author
Date
2012-05-18
Date Issued
ISI Journal
Impact factor: 2.848 (Year: 2012)
Citation
Maha Abdelhameed Elbana, Francisco Ramirez de Cartagena Bisbe, Jaume Puig-Bargues. (18/5/2012). Effectiveness of sand media filters for removing turbidity and recovering dissolved oxygen from a reclaimed effluent used for micro-irrigation. Agricultural Water Management, 111, pp. 27-33.
Abstract
Sand media filters are among the most common filters used in micro-irrigation systems, especially for
filtering waters with large amounts of organic contaminants like reclaimed effluents. An experiment was
conducted for 1620 h between August 2007 and September 2008 using a reclaimed effluent to evaluate
the efficiency of sand filters with sand effective diameters of 0.32, 0.47, 0.63 and 0.64 mm in decreasing
turbidity and improving dissolved oxygen concentration. In addition, this study strived to determine the
filter ripening period (i.e. the time after backwashing when the filtered effluent has the lowest quality)
and the effect of filter backwashing on filtration efficiency. Depending on the sand effective size, the sand
filter achieved turbidity reductions of between 59.6 and 85.4% and dissolved oxygen recoveries from 4.5
to 15.7%. During the experiment the filter ripening period was 15 min. Overall, the results support the
idea that a daily backwashing is a good maintenance practice since it reduces inefficient backwashings
and increases dissolved oxygen, which is interesting when hypoxic water is used for irrigation.
