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Pressure, Energy and Sand Media Filters
Sand media filters are commonly used in agricultural microirrigation systems. They have the advantages of simplicity and large capacities and are favored by many farmers and designers over other filtration hardware when there is a lot of organic matter in the water. The Irrigation Training and Research Center (ITRC) at Cal Poly San Luis looked at sand filters to see if it were possible to use lower-than-accepted backflush pressure and thereby reduce the total pressure required for irrigation systems. By lowering backflush pressure it would be possible to design a system that could run at an overall lower pressure and hence cost. The various components of microirrigation systems run at lower pressures than the backflush pressures recommended for most sand media filters.
The conclusions are:
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There are substantial pressure differences amongst different models and designs during backflush and filtration
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The main pressure loss is at the backflush valves
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If designed right large backflush flow rates can be accomplished at low backflush pressures (this is critical for proper detritus removal).
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There are substantial differences among underdrains of various models which affects pressure requirements
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No large intimal high pressure was necessary to break up the media bed, a common practice.
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Different underdrain designs create different patterns of cleaning the media.
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There were substantial differences among models in the amount of sand discharged from the system at backflow rate of 190 GPM. Sand discharge should actually be avoided since it's an indication of preferential flow and poor cleaning.
These are some new ideas, and even though they are meant to reduce pressure and energy use, they are also good management suggestions.
If this strikes your fancy, read more at http://www.itrc.org/reports/mediafilters.htm
sand filter
13th Annual Strawberry Production Meeting in August
Join Ventura County strawberry growers at the 13th Annual Strawberry Production Meeting!
Strawberries are the largest crop grown in Ventura County and represent millions in revenues to the area. UC Ventura County Cooperative Extension advisor Dr. Oleg Daugovish sponsors this event every year to update the public and county growers on the latest in strawberry research. The meeting will feature agricultural experts who will speak on topics relevant to strawberry production in Ventura County. Several presentations will focus on irrigation, an important issue for growers in drought-susceptible southern California.
Time: 7:30 (registration); 8:00 am to 12:30 pm
Location:
Freedom Center
516 Eubanks Rd.
Camarillo, CA
Event is free, no cost to public and includes lunch and refreshments.
In English and in Spanish
Contact Oleg Daugovish at 805-645-1454 or odaugovish@ucdavis.edu for registration or to make special arrangements.
See here to view flyer/agenda for this event!
Continuous education credits have been approved from the Department of Pesticide Regulation and VCAILG credits have been requested from the Regional Water Quality Control Board.
