The objective of this study was to test the performance of a traditional gate-flushing device and a newly designed vacuum-flushing device in removing sediment from combined sewers and CSO storage tanks. A laboratory hydraulic flume was used to simulate a reach of sewer or storage tank. The flushing device was fabricated and installed at upstream end of the flume. The removed sediment was collected at downstream end of the flume and weighed. The test results indicate that the weight of flushed sediment increases with increasing initial water depth in the flushing device; the weight of flushed sediment decreases with increasing initial water depth in the flume; the weight of flushed sediment only changes slightly with changing height of flushing device opening for water release and does not necessarily increase with increasing opening height. Water is held up by vacuum and is released upon dissipation of the vacuum in the vacuum-flushing device rather than through closing and opening of a mechanical gate in the gate-flushing device. The test results indicate that sediment removal efficiency of the vacuum-flushing device is practically the same as the gate-flushing device.
[1]
J.-L. Bertrand-Krajewski.
Sewer sediment management: some historical aspects of egg-shaped sewers and flushing tanks.
,
2003
.
[2]
William C. Pisano,et al.
Automated Sewer and Drainage Flushing Systems in Cambridge, Massachusetts
,
2003
.
[3]
Thorkild Hvitved-Jacobsen,et al.
European Research into Sewer Sediments and Associated Pollutants and Processes
,
2003
.
[4]
Richard Field,et al.
Sewer-Sediment Control: Overview of an Environmental Protection Agency Wet-Weather Flow Research Program
,
2003
.
[5]
Qizhong Guo,et al.
SURGING IN URBAN STORM DRAINAGE SYSTEMS
,
1990
.
[6]
D Cecil,et al.
Controlling nitrogen removal using redox and ammonium sensors.
,
2003,
Water science and technology : a journal of the International Association on Water Pollution Research.
[7]
Adrian J. Saul,et al.
Validation of Existing Bed Load Transport Formulas using In-Sewer Sediment
,
2003
.