An effective means of providing a greater level of disinfection without increasing
disinfection byproducts is to improve chlorine contact chamber flow characteristics. The
question of the most efficient geometric design of a chlorine contact chamber has been
studied in the past. A circular basin is more economical than a rectangular basin, but
typical baffle wall arrangements are difficult to fit into a circular shape. The most
common baffle designs are serpentine patterns or other combinations of straight chambers,
which typically achieve disinfection efficiencies (T10/T) of 70% or less.
A new spiral baffle design combines the economics of a circular contact chamber with
the extremely high disinfection efficiency and low headloss inherent in a spiral baffle
wall arrangement. Although spiral baffle designs have been designed and built in the
past, the actual construction of a spiral is often mistakenly thought to be difficult. Most
previous designs relied on concentric circular walls inside the outer shell, with a radial
wall intersecting the concentric circles. This design is essentially a hybrid of a spiral and
a serpentine pattern, and although more efficient than a straight-walled serpentine
arrangement, the discontinuity of the circular walls due to the gaps along the radial wall
make for difficult analysis, and a substantial boundary member. The spiral design was
composed entirely of circular semi-circles or partial circles, of varying radii. This
eliminated all sharp corners, allowing the water to always flow in circular pattern,
thereby considerably reducing turbulence and head losses. By placing the inlet at the
edge of the circular tank and the outlet in the center, concerns of cross connection were
eliminated. Includes figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 810 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 12 |
| Published : | 06/17/2004 |
