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Chemical
Lake and Waterway treatment techniques:
By:
Dave Murray
Aquatic
vegetation (aquatic weeds, to those that can make money by
calling them weeds and thus needing to be killed) has
evolved over millions of years. Their increasing ability to
survive and prosper is not a consequence of thought or
contemplation about how to survive. They survive and prosper
because they became remarkably efficient in absorbing and
utilizing the nutrients they could absorb from the
surrounding waters.
Sand
filtration of domestic water supplies
By:
Dave Murray
Sand
filtration of a water supply is as old as Egyptian
technology.
The
concept is very simple. If you create a layer of fine sands,
the space between each grain can still allow water to pass
through, but is still small enough to trap and retain fine
particles within the water flowing through it. The sand bed
can also assist in filtering out many types of small
biological organisms.
Rapid
Sand Filters and Filtration
By:
Dave Murray
Rapid sand filters
are large filter vessels (tanks), most frequently
manufactured from carbon or mild steel. Many vessels are
manufactured from fiber glass or composite materials.
Slow
Sand Filtration of
domestic water supplies
By: Dave Murray
Slow sand filters
utilize sand beds to support a biological layer that exists
atop a bed of sand. This layer is called the Schmutzdecke.
Schmutzdecke (German,
"grime or filth cover") is a complex biological
layer formed on the surface of a
slow
sand filter.
The Schmutzdecke is
the layer that provides the primary filtering of potable
water treatment. The underlying sand providing the support
medium for this biological treatment layer.
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