Sand Trap


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sand trap

[′san ‚trap]
(engineering)
A device in a conduit for trapping sand or soil particles carried by the water.

Sand Trap

 

a device for separating mechanical impurities of mineral origin (mainly sand) from sewage. The sand trap is usually installed before the settling tanks of sewage treatment plants. Sand traps are used because simultaneous separation of mineral and organic impurities in settling tanks makes the process of removing the sediment from the settling tanks and subjecting it to further treatment (fermentation) in digestion tanks difficult. The sand trap mainly entrains sand particles 0.25 mm or more in size.

Sand traps may have horizontal, vertical, or spiral movement of the water (the first is the most common). Traps with spiral movement of the water may be aerated with compressed air blown through the water. Horizontal sand traps are reinforced-concrete tanks of rectangular or trapezoidal cross section, in which the water moves at a rate of 0.15–0.30 m/sec and remains in the trap for 30–60 sec; the sand is precipitated by the force of gravity.

sand interceptor, sand trap

sand interceptor
A small catch basin designed and constructed to prevent the
References in periodicals archive ?
Preferred area for research is Sand Trap Chamber of Golen Gol HPP which is located in Khyber Pakhtunkhwa about 22 km north of Chitral town at the junction of Golen Gol River with Mastuj River.
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665 at Chicago last October), ended with a parachute malfunction in the shutdown area, with Pedregon sliding his Chevy Monte Carlo in the sand trap at the end of the track.
Michael's car went off very quickly and he couldn't do anything because he was running across the sand trap.
Contract notice: Creation Of A Pumping Station, Rake And Sand Trap
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Contract notice: Provision of Recycling of sludge and sand trap and transport of screenings.
said Lynn Ryll, sporting a ``bad dude'' Raiders sweat shirt from a stool at the Sand Trap in Panorama City, during a Tampa Bay touchdown.
4 rumertechnik sand trap and primary sedimentation.
In a difficult first hole, Annika Sorenstam blasts out of a sand trap and takes a double bogey Thursday at Wilshire Country Club.
Contract award notice: utilization of computing and sand trap and residues from sewage cleaning.